Ext.util.Observable
Hierarchy
Ext.BaseExt.util.ObservableSubclasses
Mixed into
Files
Base class that provides a common interface for publishing events. Subclasses are expected to to have a property "events" with all the events defined, and, optionally, a property "listeners" with configured listeners defined.
For example:
Ext.define('Employee', {
mixins: {
observable: 'Ext.util.Observable'
},
constructor: function (config) {
// The Observable constructor copies all of the properties of `config` on
// to `this` using Ext.apply. Further, the `listeners` property is
// processed to add listeners.
//
this.mixins.observable.constructor.call(this, config);
this.addEvents(
'fired',
'quit'
);
}
});
This could then be used like this:
var newEmployee = new Employee({
name: employeeName,
listeners: {
quit: function() {
// By default, "this" will be the object that fired the event.
alert(this.name + " has quit!");
}
}
});
Available since: 1.1.0
Config options
A config object containing one or more event handlers to be added to this object during initialization. This should be a valid listeners config object as specified in the addListener example for attaching multiple handlers at once.
DOM events from Ext JS Components
While some Ext JS Component classes export selected DOM events (e.g. "click", "mouseover" etc), this is usually
only done when extra value can be added. For example the DataView's itemclick event passing the node clicked on. To access DOM events directly from a
child element of a Component, we need to specify the element option to identify the Component property to add a
DOM listener to:
new Ext.panel.Panel({
width: 400,
height: 200,
dockedItems: [{
xtype: 'toolbar'
}],
listeners: {
click: {
element: 'el', //bind to the underlying el property on the panel
fn: function(){ console.log('click el'); }
},
dblclick: {
element: 'body', //bind to the underlying body property on the panel
fn: function(){ console.log('dblclick body'); }
}
}
});
Available since: 1.1.0
Properties
Instance Properties eventsSuspended : NumberprivateInitial suspended call count. ...Initial suspended call count. Incremented when suspendEvents is called, decremented when resumeEvents is called.
Defaults to: 0
Available since: 4.1.1
hasListeners : ObjectreadonlyThis object holds a key for any event that has a listener. ...This object holds a key for any event that has a listener. The listener may be set
directly on the instance, or on its class or a super class (via observe) or
on the MVC EventBus. The values of this object are truthy
(a non-zero number) and falsy (0 or undefined). They do not represent an exact count
of listeners. The value for an event is truthy if the event must be fired and is
falsy if there is no need to fire the event.
The intended use of this property is to avoid the expense of fireEvent calls when
there are no listeners. This can be particularly helpful when one would otherwise
have to call fireEvent hundreds or thousands of times. It is used like this:
if (this.hasListeners.foo) {
this.fireEvent('foo', this, arg1);
}
Available since: 4.1.0
true in this class to identify an object as an instantiated Observable, or subclass thereof. ...true in this class to identify an object as an instantiated Observable, or subclass thereof.
Defaults to: true
Available since: 4.0.0
Get the reference to the current class from which this object was instantiated. ...Get the reference to the current class from which this object was instantiated. Unlike statics,
this.self is scope-dependent and it's meant to be used for dynamic inheritance. See statics
for a detailed comparison
Ext.define('My.Cat', {
statics: {
speciesName: 'Cat' // My.Cat.speciesName = 'Cat'
},
constructor: function() {
alert(this.self.speciesName); // dependent on 'this'
},
clone: function() {
return new this.self();
}
});
Ext.define('My.SnowLeopard', {
extend: 'My.Cat',
statics: {
speciesName: 'Snow Leopard' // My.SnowLeopard.speciesName = 'Snow Leopard'
}
});
var cat = new My.Cat(); // alerts 'Cat'
var snowLeopard = new My.SnowLeopard(); // alerts 'Snow Leopard'
var clone = snowLeopard.clone();
alert(Ext.getClassName(clone)); // alerts 'My.SnowLeopard'
Available since: 4.0.0
Initial suspended call count. Incremented when suspendEvents is called, decremented when resumeEvents is called.
Defaults to: 0
Available since: 4.1.1
This object holds a key for any event that has a listener. The listener may be set directly on the instance, or on its class or a super class (via observe) or on the MVC EventBus. The values of this object are truthy (a non-zero number) and falsy (0 or undefined). They do not represent an exact count of listeners. The value for an event is truthy if the event must be fired and is falsy if there is no need to fire the event.
The intended use of this property is to avoid the expense of fireEvent calls when there are no listeners. This can be particularly helpful when one would otherwise have to call fireEvent hundreds or thousands of times. It is used like this:
if (this.hasListeners.foo) {
this.fireEvent('foo', this, arg1);
}
Available since: 4.1.0
true in this class to identify an object as an instantiated Observable, or subclass thereof.
Defaults to: true
Available since: 4.0.0
Get the reference to the current class from which this object was instantiated. Unlike statics,
this.self is scope-dependent and it's meant to be used for dynamic inheritance. See statics
for a detailed comparison
Ext.define('My.Cat', {
statics: {
speciesName: 'Cat' // My.Cat.speciesName = 'Cat'
},
constructor: function() {
alert(this.self.speciesName); // dependent on 'this'
},
clone: function() {
return new this.self();
}
});
Ext.define('My.SnowLeopard', {
extend: 'My.Cat',
statics: {
speciesName: 'Snow Leopard' // My.SnowLeopard.speciesName = 'Snow Leopard'
}
});
var cat = new My.Cat(); // alerts 'Cat'
var snowLeopard = new My.SnowLeopard(); // alerts 'Snow Leopard'
var clone = snowLeopard.clone();
alert(Ext.getClassName(clone)); // alerts 'My.SnowLeopard'
Available since: 4.0.0
Static Properties
Methods
Instance Methods addEvents( eventNames )Adds the specified events to the list of events which this Observable may fire. ...Adds the specified events to the list of events which this Observable may fire.
Available since: 1.1.0
Parameters
Appends an event handler to this object. ...Appends an event handler to this object. For example:
myGridPanel.on("mouseover", this.onMouseOver, this);
The method also allows for a single argument to be passed which is a config object
containing properties which specify multiple events. For example:
myGridPanel.on({
cellClick: this.onCellClick,
mouseover: this.onMouseOver,
mouseout: this.onMouseOut,
scope: this // Important. Ensure "this" is correct during handler execution
});
One can also specify options for each event handler separately:
myGridPanel.on({
cellClick: {fn: this.onCellClick, scope: this, single: true},
mouseover: {fn: panel.onMouseOver, scope: panel}
});
Names of methods in a specified scope may also be used. Note that
scope MUST be specified to use this option:
myGridPanel.on({
cellClick: {fn: 'onCellClick', scope: this, single: true},
mouseover: {fn: 'onMouseOver', scope: panel}
});
Available since: 1.1.0
Parameters
- eventName : String/Object
The name of the event to listen for.
May also be an object who's property names are event names.
- fn : Function (optional)
The method the event invokes, or if scope is specified, the name* of the method within
the specified scope. Will be called with arguments
given to fireEvent plus the options parameter described below.
- scope : Object (optional)
The scope (this reference) in which the handler function is
executed. If omitted, defaults to the object which fired the event.
- options : Object (optional)
An object containing handler configuration.
Note: Unlike in ExtJS 3.x, the options object will also be passed as the last
argument to every event handler.
This object may contain any of the following properties:
- scope : Object
The scope (this reference) in which the handler function is executed. If omitted,
defaults to the object which fired the event.
- delay : Number
The number of milliseconds to delay the invocation of the handler after the event fires.
- single : Boolean
True to add a handler to handle just the next firing of the event, and then remove itself.
- buffer : Number
Causes the handler to be scheduled to run in an Ext.util.DelayedTask delayed
by the specified number of milliseconds. If the event fires again within that time,
the original handler is not invoked, but the new handler is scheduled in its place.
- target : Ext.util.Observable
Only call the handler if the event was fired on the target Observable, not if the event
was bubbled up from a child Observable.
- element : String
This option is only valid for listeners bound to Components.
The name of a Component property which references an element to add a listener to.
This option is useful during Component construction to add DOM event listeners to elements of
Components which will exist only after the Component is rendered.
For example, to add a click listener to a Panel's body:
new Ext.panel.Panel({
title: 'The title',
listeners: {
click: this.handlePanelClick,
element: 'body'
}
});
- destroyable : Boolean (optional)
When specified as true, the function returns A Destroyable object. An object which implements the destroy method which removes all listeners added in this call.
Combining Options
Using the options argument, it is possible to combine different types of listeners:
A delayed, one-time listener.
myPanel.on('hide', this.handleClick, this, {
single: true,
delay: 100
});
Defaults to: false
Returns
- Object
Only when the destroyable option is specified.
A Destroyable object. An object which implements the destroy method which removes all listeners added in this call. For example:
this.btnListeners = = myButton.on({
destroyable: true
mouseover: function() { console.log('mouseover'); },
mouseout: function() { console.log('mouseout'); },
click: function() { console.log('click'); }
});
And when those listeners need to be removed:
Ext.destroy(this.btnListeners);
or
this.btnListeners.destroy();
Overrides: Ext.AbstractComponent.addListener
Adds listeners to any Observable object (or Ext.Element) which are automatically removed when this Component is
destr...Adds listeners to any Observable object (or Ext.Element) which are automatically removed when this Component is
destroyed.
Available since: 4.0.0
Parameters
- item : Ext.util.Observable/Ext.Element
The item to which to add a listener/listeners.
- ename : Object/String
The event name, or an object containing event name properties.
- fn : Function (optional)
If the ename parameter was an event name, this is the handler function.
- scope : Object (optional)
If the ename parameter was an event name, this is the scope (this reference)
in which the handler function is executed.
- options : Object (optional)
If the ename parameter was an event name, this is the
addListener options.
Returns
- Object
Only when the destroyable option is specified.
A Destroyable object. An object which implements the destroy method which removes all listeners added in this call. For example:
this.btnListeners = = myButton.mon({
destroyable: true
mouseover: function() { console.log('mouseover'); },
mouseout: function() { console.log('mouseout'); },
click: function() { console.log('click'); }
});
And when those listeners need to be removed:
Ext.destroy(this.btnListeners);
or
this.btnListeners.destroy();
Call the original method that was previously overridden with override
Ext.define('My.Cat', {
constructor: functi...Call the original method that was previously overridden with override
Ext.define('My.Cat', {
constructor: function() {
alert("I'm a cat!");
}
});
My.Cat.override({
constructor: function() {
alert("I'm going to be a cat!");
this.callOverridden();
alert("Meeeeoooowwww");
}
});
var kitty = new My.Cat(); // alerts "I'm going to be a cat!"
// alerts "I'm a cat!"
// alerts "Meeeeoooowwww"
This method has been deprecated
as of 4.1. Use callParent instead.
Available since: 4.0.0
Parameters
- args : Array/Arguments
The arguments, either an array or the arguments object
from the current method, for example: this.callOverridden(arguments)
Returns
- Object
Returns the result of calling the overridden method
Call the "parent" method of the current method. ...Call the "parent" method of the current method. That is the method previously
overridden by derivation or by an override (see Ext.define).
Ext.define('My.Base', {
constructor: function (x) {
this.x = x;
},
statics: {
method: function (x) {
return x;
}
}
});
Ext.define('My.Derived', {
extend: 'My.Base',
constructor: function () {
this.callParent([21]);
}
});
var obj = new My.Derived();
alert(obj.x); // alerts 21
This can be used with an override as follows:
Ext.define('My.DerivedOverride', {
override: 'My.Derived',
constructor: function (x) {
this.callParent([x*2]); // calls original My.Derived constructor
}
});
var obj = new My.Derived();
alert(obj.x); // now alerts 42
This also works with static methods.
Ext.define('My.Derived2', {
extend: 'My.Base',
statics: {
method: function (x) {
return this.callParent([x*2]); // calls My.Base.method
}
}
});
alert(My.Base.method(10); // alerts 10
alert(My.Derived2.method(10); // alerts 20
Lastly, it also works with overridden static methods.
Ext.define('My.Derived2Override', {
override: 'My.Derived2',
statics: {
method: function (x) {
return this.callParent([x*2]); // calls My.Derived2.method
}
}
});
alert(My.Derived2.method(10); // now alerts 40
To override a method and replace it and also call the superclass method, use
callSuper. This is often done to patch a method to fix a bug.
Available since: 4.0.0
Parameters
- args : Array/Arguments
The arguments, either an array or the arguments object
from the current method, for example: this.callParent(arguments)
Returns
- Object
Returns the result of calling the parent method
This method is used by an override to call the superclass method but bypass any
overridden method. ...This method is used by an override to call the superclass method but bypass any
overridden method. This is often done to "patch" a method that contains a bug
but for whatever reason cannot be fixed directly.
Consider:
Ext.define('Ext.some.Class', {
method: function () {
console.log('Good');
}
});
Ext.define('Ext.some.DerivedClass', {
method: function () {
console.log('Bad');
// ... logic but with a bug ...
this.callParent();
}
});
To patch the bug in DerivedClass.method, the typical solution is to create an
override:
Ext.define('App.paches.DerivedClass', {
override: 'Ext.some.DerivedClass',
method: function () {
console.log('Fixed');
// ... logic but with bug fixed ...
this.callSuper();
}
});
The patch method cannot use callParent to call the superclass method since
that would call the overridden method containing the bug. In other words, the
above patch would only produce "Fixed" then "Good" in the console log, whereas,
using callParent would produce "Fixed" then "Bad" then "Good".
Available since: Ext JS 4.1.3
Parameters
- args : Array/Arguments
The arguments, either an array or the arguments object
from the current method, for example: this.callSuper(arguments)
Returns
- Object
Returns the result of calling the superclass method
Removes all listeners for this object including the managed listeners ...Removes all listeners for this object including the managed listeners
Available since: 4.0.0
Removes all managed listeners for this object. ...Removes all managed listeners for this object.
Available since: 4.0.0
continueFireEvent( eventName, args, bubbles )private Creates an event handling function which refires the event from this object as the passed event name. ... destroy( )private ...
Available since: 4.1.1
Overrides: Ext.util.ElementContainer.destroy, Ext.AbstractComponent.destroy, Ext.AbstractPlugin.destroy
enableBubble( eventNames )Enables events fired by this Observable to bubble up an owner hierarchy by calling this.getBubbleTarget() if
present. ...Enables events fired by this Observable to bubble up an owner hierarchy by calling this.getBubbleTarget() if
present. There is no implementation in the Observable base class.
This is commonly used by Ext.Components to bubble events to owner Containers.
See Ext.Component.getBubbleTarget. The default implementation in Ext.Component returns the
Component's immediate owner. But if a known target is required, this can be overridden to access the
required target more quickly.
Example:
Ext.define('Ext.overrides.form.field.Base', {
override: 'Ext.form.field.Base',
// Add functionality to Field's initComponent to enable the change event to bubble
initComponent: function () {
this.callParent();
this.enableBubble('change');
}
});
var myForm = Ext.create('Ext.form.Panel', {
title: 'User Details',
items: [{
...
}],
listeners: {
change: function() {
// Title goes red if form has been modified.
myForm.header.setStyle('color', 'red');
}
}
});
Available since: 3.4.0
Parameters
Fires the specified event with the passed parameters (minus the event name, plus the options object passed
to addList...Fires the specified event with the passed parameters (minus the event name, plus the options object passed
to addListener).
An event may be set to bubble up an Observable parent hierarchy (See Ext.Component.getBubbleTarget) by
calling enableBubble.
Available since: 1.1.0
Parameters
- eventName : String
The name of the event to fire.
- args : Object...
Variable number of parameters are passed to handlers.
Returns
- Boolean
returns false if any of the handlers return false otherwise it returns true.
getBubbleParent( ) : Ext.util.ObservableprivateGets the bubbling parent for an Observable ...Gets the bubbling parent for an Observable
Available since: 4.0.7
Returns
- Ext.util.Observable
The bubble parent. null is returned if no bubble target exists
Checks to see if this object has any listeners for a specified event, or whether the event bubbles. ...Checks to see if this object has any listeners for a specified event, or whether the event bubbles. The answer
indicates whether the event needs firing or not.
Available since: 1.1.0
Parameters
- eventName : String
The name of the event to check for
Returns
- Boolean
true if the event is being listened for or bubbles, else false
Initialize configuration for this class. ...Initialize configuration for this class. a typical example:
Ext.define('My.awesome.Class', {
// The default config
config: {
name: 'Awesome',
isAwesome: true
},
constructor: function(config) {
this.initConfig(config);
}
});
var awesome = new My.awesome.Class({
name: 'Super Awesome'
});
alert(awesome.getName()); // 'Super Awesome'
Available since: 4.0.0
Parameters
- config : Object
Returns
- Ext.Base
this
Shorthand for addManagedListener. ...Shorthand for addManagedListener.
Adds listeners to any Observable object (or Ext.Element) which are automatically removed when this Component is
destroyed.
Available since: 4.0.2
Parameters
- item : Ext.util.Observable/Ext.Element
The item to which to add a listener/listeners.
- ename : Object/String
The event name, or an object containing event name properties.
- fn : Function (optional)
If the ename parameter was an event name, this is the handler function.
- scope : Object (optional)
If the ename parameter was an event name, this is the scope (this reference)
in which the handler function is executed.
- options : Object (optional)
If the ename parameter was an event name, this is the
addListener options.
Returns
- Object
Only when the destroyable option is specified.
A Destroyable object. An object which implements the destroy method which removes all listeners added in this call. For example:
this.btnListeners = = myButton.mon({
destroyable: true
mouseover: function() { console.log('mouseover'); },
mouseout: function() { console.log('mouseout'); },
click: function() { console.log('click'); }
});
And when those listeners need to be removed:
Ext.destroy(this.btnListeners);
or
this.btnListeners.destroy();
mun( item, ename, [fn], [scope] )Shorthand for removeManagedListener. ...Shorthand for removeManagedListener.
Removes listeners that were added by the mon method.
Available since: 4.0.2
Parameters
- item : Ext.util.Observable/Ext.Element
The item from which to remove a listener/listeners.
- ename : Object/String
The event name, or an object containing event name properties.
- fn : Function (optional)
If the ename parameter was an event name, this is the handler function.
- scope : Object (optional)
If the ename parameter was an event name, this is the scope (this reference)
in which the handler function is executed.
Shorthand for addListener. ...Shorthand for addListener.
Appends an event handler to this object. For example:
myGridPanel.on("mouseover", this.onMouseOver, this);
The method also allows for a single argument to be passed which is a config object
containing properties which specify multiple events. For example:
myGridPanel.on({
cellClick: this.onCellClick,
mouseover: this.onMouseOver,
mouseout: this.onMouseOut,
scope: this // Important. Ensure "this" is correct during handler execution
});
One can also specify options for each event handler separately:
myGridPanel.on({
cellClick: {fn: this.onCellClick, scope: this, single: true},
mouseover: {fn: panel.onMouseOver, scope: panel}
});
Names of methods in a specified scope may also be used. Note that
scope MUST be specified to use this option:
myGridPanel.on({
cellClick: {fn: 'onCellClick', scope: this, single: true},
mouseover: {fn: 'onMouseOver', scope: panel}
});
Available since: 1.1.0
Parameters
- eventName : String/Object
The name of the event to listen for.
May also be an object who's property names are event names.
- fn : Function (optional)
The method the event invokes, or if scope is specified, the name* of the method within
the specified scope. Will be called with arguments
given to fireEvent plus the options parameter described below.
- scope : Object (optional)
The scope (this reference) in which the handler function is
executed. If omitted, defaults to the object which fired the event.
- options : Object (optional)
An object containing handler configuration.
Note: Unlike in ExtJS 3.x, the options object will also be passed as the last
argument to every event handler.
This object may contain any of the following properties:
- scope : Object
The scope (this reference) in which the handler function is executed. If omitted,
defaults to the object which fired the event.
- delay : Number
The number of milliseconds to delay the invocation of the handler after the event fires.
- single : Boolean
True to add a handler to handle just the next firing of the event, and then remove itself.
- buffer : Number
Causes the handler to be scheduled to run in an Ext.util.DelayedTask delayed
by the specified number of milliseconds. If the event fires again within that time,
the original handler is not invoked, but the new handler is scheduled in its place.
- target : Ext.util.Observable
Only call the handler if the event was fired on the target Observable, not if the event
was bubbled up from a child Observable.
- element : String
This option is only valid for listeners bound to Components.
The name of a Component property which references an element to add a listener to.
This option is useful during Component construction to add DOM event listeners to elements of
Components which will exist only after the Component is rendered.
For example, to add a click listener to a Panel's body:
new Ext.panel.Panel({
title: 'The title',
listeners: {
click: this.handlePanelClick,
element: 'body'
}
});
- destroyable : Boolean (optional)
When specified as true, the function returns A Destroyable object. An object which implements the destroy method which removes all listeners added in this call.
Combining Options
Using the options argument, it is possible to combine different types of listeners:
A delayed, one-time listener.
myPanel.on('hide', this.handleClick, this, {
single: true,
delay: 100
});
Defaults to: false
Returns
- Object
Only when the destroyable option is specified.
A Destroyable object. An object which implements the destroy method which removes all listeners added in this call. For example:
this.btnListeners = = myButton.on({
destroyable: true
mouseover: function() { console.log('mouseover'); },
mouseout: function() { console.log('mouseout'); },
click: function() { console.log('click'); }
});
And when those listeners need to be removed:
Ext.destroy(this.btnListeners);
or
this.btnListeners.destroy();
onConfigUpdate( names, callback, scope )private prepareClass( T )privatePrepares a given class for observable instances. ...Prepares a given class for observable instances. This method is called when a
class derives from this class or uses this class as a mixin.
Available since: 4.1.0
Parameters
- T : Function
The class constructor to prepare.
Relays selected events from the specified Observable as if the events were fired by this. ...Relays selected events from the specified Observable as if the events were fired by this.
For example if you are extending Grid, you might decide to forward some events from store.
So you can do this inside your initComponent:
this.relayEvents(this.getStore(), ['load']);
The grid instance will then have an observable 'load' event which will be passed the
parameters of the store's load event and any function fired with the grid's load event
would have access to the grid using the this keyword.
Available since: 2.3.0
Parameters
- origin : Object
The Observable whose events this object is to relay.
- events : String[]
Array of event names to relay.
- prefix : String (optional)
A common prefix to prepend to the event names. For example:
this.relayEvents(this.getStore(), ['load', 'clear'], 'store');
Now the grid will forward 'load' and 'clear' events of store as 'storeload' and 'storeclear'.
Returns
- Object
A Destroyable object. An object which implements the destroy method which, when destroyed, removes all relayers. For example:
this.storeRelayers = this.relayEvents(this.getStore(), ['load', 'clear'], 'store');
Can be undone by calling
Ext.destroy(this.storeRelayers);
or
this.store.relayers.destroy();
removeListener( eventName, fn, [scope] )Removes an event handler. ...Removes an event handler.
Available since: 1.1.0
Parameters
- eventName : String
The type of event the handler was associated with.
- fn : Function
The handler to remove. This must be a reference to the function passed into the
addListener call.
- scope : Object (optional)
The scope originally specified for the handler. It must be the same as the
scope argument specified in the original call to addListener or the listener will not be removed.
removeManagedListener( item, ename, [fn], [scope] )Removes listeners that were added by the mon method. ...Removes listeners that were added by the mon method.
Available since: 4.0.0
Parameters
- item : Ext.util.Observable/Ext.Element
The item from which to remove a listener/listeners.
- ename : Object/String
The event name, or an object containing event name properties.
- fn : Function (optional)
If the ename parameter was an event name, this is the handler function.
- scope : Object (optional)
If the ename parameter was an event name, this is the scope (this reference)
in which the handler function is executed.
removeManagedListenerItem( isClear, managedListener )private resumeEvents( )Resumes firing events (see suspendEvents). ...Resumes firing events (see suspendEvents).
If events were suspended using the queueSuspended parameter, then all events fired
during event suspension will be sent to any listeners now.
Available since: 2.3.0
Get the reference to the class from which this object was instantiated. ...Get the reference to the class from which this object was instantiated. Note that unlike self,
this.statics() is scope-independent and it always returns the class from which it was called, regardless of what
this points to during run-time
Ext.define('My.Cat', {
statics: {
totalCreated: 0,
speciesName: 'Cat' // My.Cat.speciesName = 'Cat'
},
constructor: function() {
var statics = this.statics();
alert(statics.speciesName); // always equals to 'Cat' no matter what 'this' refers to
// equivalent to: My.Cat.speciesName
alert(this.self.speciesName); // dependent on 'this'
statics.totalCreated++;
},
clone: function() {
var cloned = new this.self; // dependent on 'this'
cloned.groupName = this.statics().speciesName; // equivalent to: My.Cat.speciesName
return cloned;
}
});
Ext.define('My.SnowLeopard', {
extend: 'My.Cat',
statics: {
speciesName: 'Snow Leopard' // My.SnowLeopard.speciesName = 'Snow Leopard'
},
constructor: function() {
this.callParent();
}
});
var cat = new My.Cat(); // alerts 'Cat', then alerts 'Cat'
var snowLeopard = new My.SnowLeopard(); // alerts 'Cat', then alerts 'Snow Leopard'
var clone = snowLeopard.clone();
alert(Ext.getClassName(clone)); // alerts 'My.SnowLeopard'
alert(clone.groupName); // alerts 'Cat'
alert(My.Cat.totalCreated); // alerts 3
Available since: 4.0.0
Returns
suspendEvents( queueSuspended )Suspends the firing of all events. ...Suspends the firing of all events. (see resumeEvents)
Available since: 2.3.0
Parameters
- queueSuspended : Boolean
Pass as true to queue up suspended events to be fired
after the resumeEvents call instead of discarding all suspended events.
un( eventName, fn, [scope] )Shorthand for removeListener. ...Shorthand for removeListener.
Removes an event handler.
Available since: 1.1.0
Parameters
- eventName : String
The type of event the handler was associated with.
- fn : Function
The handler to remove. This must be a reference to the function passed into the
addListener call.
- scope : Object (optional)
The scope originally specified for the handler. It must be the same as the
scope argument specified in the original call to addListener or the listener will not be removed.
Adds the specified events to the list of events which this Observable may fire.
Available since: 1.1.0
Parameters
Appends an event handler to this object. For example:
myGridPanel.on("mouseover", this.onMouseOver, this);
The method also allows for a single argument to be passed which is a config object containing properties which specify multiple events. For example:
myGridPanel.on({
cellClick: this.onCellClick,
mouseover: this.onMouseOver,
mouseout: this.onMouseOut,
scope: this // Important. Ensure "this" is correct during handler execution
});
One can also specify options for each event handler separately:
myGridPanel.on({
cellClick: {fn: this.onCellClick, scope: this, single: true},
mouseover: {fn: panel.onMouseOver, scope: panel}
});
Names of methods in a specified scope may also be used. Note that
scope MUST be specified to use this option:
myGridPanel.on({
cellClick: {fn: 'onCellClick', scope: this, single: true},
mouseover: {fn: 'onMouseOver', scope: panel}
});
Available since: 1.1.0
Parameters
- eventName : String/Object
The name of the event to listen for. May also be an object who's property names are event names.
- fn : Function (optional)
The method the event invokes, or if
scopeis specified, the name* of the method within the specifiedscope. Will be called with arguments given to fireEvent plus theoptionsparameter described below. - scope : Object (optional)
The scope (
thisreference) in which the handler function is executed. If omitted, defaults to the object which fired the event. - options : Object (optional)
An object containing handler configuration.
Note: Unlike in ExtJS 3.x, the options object will also be passed as the last argument to every event handler.
This object may contain any of the following properties:
- scope : Object
The scope (
thisreference) in which the handler function is executed. If omitted, defaults to the object which fired the event. - delay : Number
The number of milliseconds to delay the invocation of the handler after the event fires.
- single : Boolean
True to add a handler to handle just the next firing of the event, and then remove itself.
- buffer : Number
Causes the handler to be scheduled to run in an Ext.util.DelayedTask delayed by the specified number of milliseconds. If the event fires again within that time, the original handler is not invoked, but the new handler is scheduled in its place.
- target : Ext.util.Observable
Only call the handler if the event was fired on the target Observable, not if the event was bubbled up from a child Observable.
- element : String
This option is only valid for listeners bound to Components. The name of a Component property which references an element to add a listener to.
This option is useful during Component construction to add DOM event listeners to elements of Components which will exist only after the Component is rendered. For example, to add a click listener to a Panel's body:
new Ext.panel.Panel({ title: 'The title', listeners: { click: this.handlePanelClick, element: 'body' } }); - destroyable : Boolean (optional)
When specified as
true, the function returns ADestroyableobject. An object which implements thedestroymethod which removes all listeners added in this call.Combining Options
Using the options argument, it is possible to combine different types of listeners:
A delayed, one-time listener.
myPanel.on('hide', this.handleClick, this, { single: true, delay: 100 });Defaults to:
false
- scope : Object
Returns
- Object
Only when the
destroyableoption is specified.A
Destroyableobject. An object which implements thedestroymethod which removes all listeners added in this call. For example:this.btnListeners = = myButton.on({ destroyable: true mouseover: function() { console.log('mouseover'); }, mouseout: function() { console.log('mouseout'); }, click: function() { console.log('click'); } });And when those listeners need to be removed:
Ext.destroy(this.btnListeners);or
this.btnListeners.destroy();
Overrides: Ext.AbstractComponent.addListener
Adds listeners to any Observable object (or Ext.Element) which are automatically removed when this Component is destroyed.
Available since: 4.0.0
Parameters
- item : Ext.util.Observable/Ext.Element
The item to which to add a listener/listeners.
- ename : Object/String
The event name, or an object containing event name properties.
- fn : Function (optional)
If the
enameparameter was an event name, this is the handler function. - scope : Object (optional)
If the
enameparameter was an event name, this is the scope (thisreference) in which the handler function is executed. - options : Object (optional)
If the
enameparameter was an event name, this is the addListener options.
Returns
- Object
Only when the
destroyableoption is specified.A
Destroyableobject. An object which implements thedestroymethod which removes all listeners added in this call. For example:this.btnListeners = = myButton.mon({ destroyable: true mouseover: function() { console.log('mouseover'); }, mouseout: function() { console.log('mouseout'); }, click: function() { console.log('click'); } });And when those listeners need to be removed:
Ext.destroy(this.btnListeners);or
this.btnListeners.destroy();
Call the original method that was previously overridden with override
Ext.define('My.Cat', {
constructor: function() {
alert("I'm a cat!");
}
});
My.Cat.override({
constructor: function() {
alert("I'm going to be a cat!");
this.callOverridden();
alert("Meeeeoooowwww");
}
});
var kitty = new My.Cat(); // alerts "I'm going to be a cat!"
// alerts "I'm a cat!"
// alerts "Meeeeoooowwww"
This method has been deprecated
as of 4.1. Use callParent instead.
Available since: 4.0.0
Parameters
- args : Array/Arguments
The arguments, either an array or the
argumentsobject from the current method, for example:this.callOverridden(arguments)
Returns
- Object
Returns the result of calling the overridden method
Call the "parent" method of the current method. That is the method previously overridden by derivation or by an override (see Ext.define).
Ext.define('My.Base', {
constructor: function (x) {
this.x = x;
},
statics: {
method: function (x) {
return x;
}
}
});
Ext.define('My.Derived', {
extend: 'My.Base',
constructor: function () {
this.callParent([21]);
}
});
var obj = new My.Derived();
alert(obj.x); // alerts 21
This can be used with an override as follows:
Ext.define('My.DerivedOverride', {
override: 'My.Derived',
constructor: function (x) {
this.callParent([x*2]); // calls original My.Derived constructor
}
});
var obj = new My.Derived();
alert(obj.x); // now alerts 42
This also works with static methods.
Ext.define('My.Derived2', {
extend: 'My.Base',
statics: {
method: function (x) {
return this.callParent([x*2]); // calls My.Base.method
}
}
});
alert(My.Base.method(10); // alerts 10
alert(My.Derived2.method(10); // alerts 20
Lastly, it also works with overridden static methods.
Ext.define('My.Derived2Override', {
override: 'My.Derived2',
statics: {
method: function (x) {
return this.callParent([x*2]); // calls My.Derived2.method
}
}
});
alert(My.Derived2.method(10); // now alerts 40
To override a method and replace it and also call the superclass method, use callSuper. This is often done to patch a method to fix a bug.
Available since: 4.0.0
Parameters
- args : Array/Arguments
The arguments, either an array or the
argumentsobject from the current method, for example:this.callParent(arguments)
Returns
- Object
Returns the result of calling the parent method
This method is used by an override to call the superclass method but bypass any overridden method. This is often done to "patch" a method that contains a bug but for whatever reason cannot be fixed directly.
Consider:
Ext.define('Ext.some.Class', {
method: function () {
console.log('Good');
}
});
Ext.define('Ext.some.DerivedClass', {
method: function () {
console.log('Bad');
// ... logic but with a bug ...
this.callParent();
}
});
To patch the bug in DerivedClass.method, the typical solution is to create an
override:
Ext.define('App.paches.DerivedClass', {
override: 'Ext.some.DerivedClass',
method: function () {
console.log('Fixed');
// ... logic but with bug fixed ...
this.callSuper();
}
});
The patch method cannot use callParent to call the superclass method since
that would call the overridden method containing the bug. In other words, the
above patch would only produce "Fixed" then "Good" in the console log, whereas,
using callParent would produce "Fixed" then "Bad" then "Good".
Available since: Ext JS 4.1.3
Parameters
- args : Array/Arguments
The arguments, either an array or the
argumentsobject from the current method, for example:this.callSuper(arguments)
Returns
- Object
Returns the result of calling the superclass method
Removes all listeners for this object including the managed listeners
Available since: 4.0.0
Removes all managed listeners for this object.
Available since: 4.0.0
Available since: 4.1.1
Overrides: Ext.util.ElementContainer.destroy, Ext.AbstractComponent.destroy, Ext.AbstractPlugin.destroy
Enables events fired by this Observable to bubble up an owner hierarchy by calling this.getBubbleTarget() if
present. There is no implementation in the Observable base class.
This is commonly used by Ext.Components to bubble events to owner Containers. See Ext.Component.getBubbleTarget. The default implementation in Ext.Component returns the Component's immediate owner. But if a known target is required, this can be overridden to access the required target more quickly.
Example:
Ext.define('Ext.overrides.form.field.Base', {
override: 'Ext.form.field.Base',
// Add functionality to Field's initComponent to enable the change event to bubble
initComponent: function () {
this.callParent();
this.enableBubble('change');
}
});
var myForm = Ext.create('Ext.form.Panel', {
title: 'User Details',
items: [{
...
}],
listeners: {
change: function() {
// Title goes red if form has been modified.
myForm.header.setStyle('color', 'red');
}
}
});
Available since: 3.4.0
Parameters
Fires the specified event with the passed parameters (minus the event name, plus the options object passed
to addListener).
An event may be set to bubble up an Observable parent hierarchy (See Ext.Component.getBubbleTarget) by calling enableBubble.
Available since: 1.1.0
Parameters
- eventName : String
The name of the event to fire.
- args : Object...
Variable number of parameters are passed to handlers.
Returns
- Boolean
returns false if any of the handlers return false otherwise it returns true.
Gets the bubbling parent for an Observable
Available since: 4.0.7
Returns
- Ext.util.Observable
The bubble parent. null is returned if no bubble target exists
Checks to see if this object has any listeners for a specified event, or whether the event bubbles. The answer indicates whether the event needs firing or not.
Available since: 1.1.0
Parameters
- eventName : String
The name of the event to check for
Returns
- Boolean
trueif the event is being listened for or bubbles, elsefalse
Initialize configuration for this class. a typical example:
Ext.define('My.awesome.Class', {
// The default config
config: {
name: 'Awesome',
isAwesome: true
},
constructor: function(config) {
this.initConfig(config);
}
});
var awesome = new My.awesome.Class({
name: 'Super Awesome'
});
alert(awesome.getName()); // 'Super Awesome'
Available since: 4.0.0
Parameters
- config : Object
Returns
- Ext.Base
this
Shorthand for addManagedListener.
Adds listeners to any Observable object (or Ext.Element) which are automatically removed when this Component is destroyed.
Available since: 4.0.2
Parameters
- item : Ext.util.Observable/Ext.Element
The item to which to add a listener/listeners.
- ename : Object/String
The event name, or an object containing event name properties.
- fn : Function (optional)
If the
enameparameter was an event name, this is the handler function. - scope : Object (optional)
If the
enameparameter was an event name, this is the scope (thisreference) in which the handler function is executed. - options : Object (optional)
If the
enameparameter was an event name, this is the addListener options.
Returns
- Object
Only when the
destroyableoption is specified.A
Destroyableobject. An object which implements thedestroymethod which removes all listeners added in this call. For example:this.btnListeners = = myButton.mon({ destroyable: true mouseover: function() { console.log('mouseover'); }, mouseout: function() { console.log('mouseout'); }, click: function() { console.log('click'); } });And when those listeners need to be removed:
Ext.destroy(this.btnListeners);or
this.btnListeners.destroy();
Shorthand for removeManagedListener.
Removes listeners that were added by the mon method.
Available since: 4.0.2
Parameters
- item : Ext.util.Observable/Ext.Element
The item from which to remove a listener/listeners.
- ename : Object/String
The event name, or an object containing event name properties.
- fn : Function (optional)
If the
enameparameter was an event name, this is the handler function. - scope : Object (optional)
If the
enameparameter was an event name, this is the scope (thisreference) in which the handler function is executed.
Shorthand for addListener.
Appends an event handler to this object. For example:
myGridPanel.on("mouseover", this.onMouseOver, this);
The method also allows for a single argument to be passed which is a config object containing properties which specify multiple events. For example:
myGridPanel.on({
cellClick: this.onCellClick,
mouseover: this.onMouseOver,
mouseout: this.onMouseOut,
scope: this // Important. Ensure "this" is correct during handler execution
});
One can also specify options for each event handler separately:
myGridPanel.on({
cellClick: {fn: this.onCellClick, scope: this, single: true},
mouseover: {fn: panel.onMouseOver, scope: panel}
});
Names of methods in a specified scope may also be used. Note that
scope MUST be specified to use this option:
myGridPanel.on({
cellClick: {fn: 'onCellClick', scope: this, single: true},
mouseover: {fn: 'onMouseOver', scope: panel}
});
Available since: 1.1.0
Parameters
- eventName : String/Object
The name of the event to listen for. May also be an object who's property names are event names.
- fn : Function (optional)
The method the event invokes, or if
scopeis specified, the name* of the method within the specifiedscope. Will be called with arguments given to fireEvent plus theoptionsparameter described below. - scope : Object (optional)
The scope (
thisreference) in which the handler function is executed. If omitted, defaults to the object which fired the event. - options : Object (optional)
An object containing handler configuration.
Note: Unlike in ExtJS 3.x, the options object will also be passed as the last argument to every event handler.
This object may contain any of the following properties:
- scope : Object
The scope (
thisreference) in which the handler function is executed. If omitted, defaults to the object which fired the event. - delay : Number
The number of milliseconds to delay the invocation of the handler after the event fires.
- single : Boolean
True to add a handler to handle just the next firing of the event, and then remove itself.
- buffer : Number
Causes the handler to be scheduled to run in an Ext.util.DelayedTask delayed by the specified number of milliseconds. If the event fires again within that time, the original handler is not invoked, but the new handler is scheduled in its place.
- target : Ext.util.Observable
Only call the handler if the event was fired on the target Observable, not if the event was bubbled up from a child Observable.
- element : String
This option is only valid for listeners bound to Components. The name of a Component property which references an element to add a listener to.
This option is useful during Component construction to add DOM event listeners to elements of Components which will exist only after the Component is rendered. For example, to add a click listener to a Panel's body:
new Ext.panel.Panel({ title: 'The title', listeners: { click: this.handlePanelClick, element: 'body' } }); - destroyable : Boolean (optional)
When specified as
true, the function returns ADestroyableobject. An object which implements thedestroymethod which removes all listeners added in this call.Combining Options
Using the options argument, it is possible to combine different types of listeners:
A delayed, one-time listener.
myPanel.on('hide', this.handleClick, this, { single: true, delay: 100 });Defaults to:
false
- scope : Object
Returns
- Object
Only when the
destroyableoption is specified.A
Destroyableobject. An object which implements thedestroymethod which removes all listeners added in this call. For example:this.btnListeners = = myButton.on({ destroyable: true mouseover: function() { console.log('mouseover'); }, mouseout: function() { console.log('mouseout'); }, click: function() { console.log('click'); } });And when those listeners need to be removed:
Ext.destroy(this.btnListeners);or
this.btnListeners.destroy();
Prepares a given class for observable instances. This method is called when a class derives from this class or uses this class as a mixin.
Available since: 4.1.0
Parameters
- T : Function
The class constructor to prepare.
Relays selected events from the specified Observable as if the events were fired by this.
For example if you are extending Grid, you might decide to forward some events from store. So you can do this inside your initComponent:
this.relayEvents(this.getStore(), ['load']);
The grid instance will then have an observable 'load' event which will be passed the
parameters of the store's load event and any function fired with the grid's load event
would have access to the grid using the this keyword.
Available since: 2.3.0
Parameters
- origin : Object
The Observable whose events this object is to relay.
- events : String[]
Array of event names to relay.
- prefix : String (optional)
A common prefix to prepend to the event names. For example:
this.relayEvents(this.getStore(), ['load', 'clear'], 'store');Now the grid will forward 'load' and 'clear' events of store as 'storeload' and 'storeclear'.
Returns
- Object
A
Destroyableobject. An object which implements thedestroymethod which, when destroyed, removes all relayers. For example:this.storeRelayers = this.relayEvents(this.getStore(), ['load', 'clear'], 'store');Can be undone by calling
Ext.destroy(this.storeRelayers);or
this.store.relayers.destroy();
Removes an event handler.
Available since: 1.1.0
Parameters
- eventName : String
The type of event the handler was associated with.
- fn : Function
The handler to remove. This must be a reference to the function passed into the addListener call.
- scope : Object (optional)
The scope originally specified for the handler. It must be the same as the scope argument specified in the original call to addListener or the listener will not be removed.
Removes listeners that were added by the mon method.
Available since: 4.0.0
Parameters
- item : Ext.util.Observable/Ext.Element
The item from which to remove a listener/listeners.
- ename : Object/String
The event name, or an object containing event name properties.
- fn : Function (optional)
If the
enameparameter was an event name, this is the handler function. - scope : Object (optional)
If the
enameparameter was an event name, this is the scope (thisreference) in which the handler function is executed.
Resumes firing events (see suspendEvents).
If events were suspended using the queueSuspended parameter, then all events fired
during event suspension will be sent to any listeners now.
Available since: 2.3.0
Get the reference to the class from which this object was instantiated. Note that unlike self,
this.statics() is scope-independent and it always returns the class from which it was called, regardless of what
this points to during run-time
Ext.define('My.Cat', {
statics: {
totalCreated: 0,
speciesName: 'Cat' // My.Cat.speciesName = 'Cat'
},
constructor: function() {
var statics = this.statics();
alert(statics.speciesName); // always equals to 'Cat' no matter what 'this' refers to
// equivalent to: My.Cat.speciesName
alert(this.self.speciesName); // dependent on 'this'
statics.totalCreated++;
},
clone: function() {
var cloned = new this.self; // dependent on 'this'
cloned.groupName = this.statics().speciesName; // equivalent to: My.Cat.speciesName
return cloned;
}
});
Ext.define('My.SnowLeopard', {
extend: 'My.Cat',
statics: {
speciesName: 'Snow Leopard' // My.SnowLeopard.speciesName = 'Snow Leopard'
},
constructor: function() {
this.callParent();
}
});
var cat = new My.Cat(); // alerts 'Cat', then alerts 'Cat'
var snowLeopard = new My.SnowLeopard(); // alerts 'Cat', then alerts 'Snow Leopard'
var clone = snowLeopard.clone();
alert(Ext.getClassName(clone)); // alerts 'My.SnowLeopard'
alert(clone.groupName); // alerts 'Cat'
alert(My.Cat.totalCreated); // alerts 3
Available since: 4.0.0
Returns
Suspends the firing of all events. (see resumeEvents)
Available since: 2.3.0
Parameters
- queueSuspended : Boolean
Pass as true to queue up suspended events to be fired after the resumeEvents call instead of discarding all suspended events.
Shorthand for removeListener.
Removes an event handler.
Available since: 1.1.0
Parameters
- eventName : String
The type of event the handler was associated with.
- fn : Function
The handler to remove. This must be a reference to the function passed into the addListener call.
- scope : Object (optional)
The scope originally specified for the handler. It must be the same as the scope argument specified in the original call to addListener or the listener will not be removed.
Static Methods addMember( name, member )chainableprivatestatic addMembers( members )chainablestaticAdd methods / properties to the prototype of this class. ...Add methods / properties to the prototype of this class.
Ext.define('My.awesome.Cat', {
constructor: function() {
...
}
});
My.awesome.Cat.addMembers({
meow: function() {
alert('Meowww...');
}
});
var kitty = new My.awesome.Cat;
kitty.meow();
Available since: 4.1.0
Parameters
- members : Object
Add / override static properties of this class. ...Add / override static properties of this class.
Ext.define('My.cool.Class', {
...
});
My.cool.Class.addStatics({
someProperty: 'someValue', // My.cool.Class.someProperty = 'someValue'
method1: function() { ... }, // My.cool.Class.method1 = function() { ... };
method2: function() { ... } // My.cool.Class.method2 = function() { ... };
});
Available since: 4.0.2
Parameters
- members : Object
Returns
- Ext.Base
this
Borrow another class' members to the prototype of this class. ...Borrow another class' members to the prototype of this class.
Ext.define('Bank', {
money: '$$$',
printMoney: function() {
alert('$$$$$$$');
}
});
Ext.define('Thief', {
...
});
Thief.borrow(Bank, ['money', 'printMoney']);
var steve = new Thief();
alert(steve.money); // alerts '$$$'
steve.printMoney(); // alerts '$$$$$$$'
Available since: 4.0.2
Parameters
- fromClass : Ext.Base
The class to borrow members from
- members : Array/String
The names of the members to borrow
Returns
- Ext.Base
this
capture( o, fn, [scope] )staticStarts capture on the specified Observable. ...Starts capture on the specified Observable. All events will be passed to the supplied function with the event
name + standard signature of the event before the event is fired. If the supplied function returns false,
the event will not fire.
Available since: 1.1.0
Parameters
- o : Ext.util.Observable
The Observable to capture events from.
- fn : Function
The function to call when an event is fired.
- scope : Object (optional)
The scope (this reference) in which the function is executed. Defaults to
the Observable firing the event.
Create a new instance of this Class. ...Create a new instance of this Class.
Ext.define('My.cool.Class', {
...
});
My.cool.Class.create({
someConfig: true
});
All parameters are passed to the constructor of the class.
Available since: 4.0.2
Returns
- Object
the created instance.
createAlias( alias, origin )staticCreate aliases for existing prototype methods. ...Create aliases for existing prototype methods. Example:
Ext.define('My.cool.Class', {
method1: function() { ... },
method2: function() { ... }
});
var test = new My.cool.Class();
My.cool.Class.createAlias({
method3: 'method1',
method4: 'method2'
});
test.method3(); // test.method1()
My.cool.Class.createAlias('method5', 'method3');
test.method5(); // test.method3() -> test.method1()
Available since: 4.0.2
Parameters
- alias : String/Object
The new method name, or an object to set multiple aliases. See
flexSetter
- origin : String/Object
The original method name
Get the current class' name in string format. ...Get the current class' name in string format.
Ext.define('My.cool.Class', {
constructor: function() {
alert(this.self.getName()); // alerts 'My.cool.Class'
}
});
My.cool.Class.getName(); // 'My.cool.Class'
Available since: 4.0.4
Returns
- String
className
implement( )deprecatedstaticAdds members to class. ...Adds members to class.
This method has been deprecated since 4.1
Use addMembers instead.
Available since: 4.0.2
mixin( name, mixinClass )chainableprivatestatic observe( c, listeners )staticSets observability on the passed class constructor. ...Sets observability on the passed class constructor.
This makes any event fired on any instance of the passed class also fire a single event through
the class allowing for central handling of events on many instances at once.
Usage:
Ext.util.Observable.observe(Ext.data.Connection);
Ext.data.Connection.on('beforerequest', function(con, options) {
console.log('Ajax request made to ' + options.url);
});
Available since: 4.0.0
Parameters
- c : Function
The class constructor to make observable.
- listeners : Object
An object containing a series of listeners to add. See addListener.
onExtended( fn, scope )chainableprivatestatic Override members of this class. ...Override members of this class. Overridden methods can be invoked via
callParent.
Ext.define('My.Cat', {
constructor: function() {
alert("I'm a cat!");
}
});
My.Cat.override({
constructor: function() {
alert("I'm going to be a cat!");
this.callParent(arguments);
alert("Meeeeoooowwww");
}
});
var kitty = new My.Cat(); // alerts "I'm going to be a cat!"
// alerts "I'm a cat!"
// alerts "Meeeeoooowwww"
As of 4.1, direct use of this method is deprecated. Use Ext.define
instead:
Ext.define('My.CatOverride', {
override: 'My.Cat',
constructor: function() {
alert("I'm going to be a cat!");
this.callParent(arguments);
alert("Meeeeoooowwww");
}
});
The above accomplishes the same result but can be managed by the Ext.Loader
which can properly order the override and its target class and the build process
can determine whether the override is needed based on the required state of the
target class (My.Cat).
This method has been deprecated since 4.1.0
Use Ext.define instead
Available since: 4.0.2
Parameters
- members : Object
The properties to add to this class. This should be
specified as an object literal containing one or more properties.
Returns
- Ext.Base
this class
releaseCapture( o )staticRemoves all added captures from the Observable. ...Removes all added captures from the Observable.
Available since: 1.1.0
Parameters
- o : Ext.util.Observable
The Observable to release
Add methods / properties to the prototype of this class.
Ext.define('My.awesome.Cat', {
constructor: function() {
...
}
});
My.awesome.Cat.addMembers({
meow: function() {
alert('Meowww...');
}
});
var kitty = new My.awesome.Cat;
kitty.meow();
Available since: 4.1.0
Parameters
- members : Object
Add / override static properties of this class.
Ext.define('My.cool.Class', {
...
});
My.cool.Class.addStatics({
someProperty: 'someValue', // My.cool.Class.someProperty = 'someValue'
method1: function() { ... }, // My.cool.Class.method1 = function() { ... };
method2: function() { ... } // My.cool.Class.method2 = function() { ... };
});
Available since: 4.0.2
Parameters
- members : Object
Returns
- Ext.Base
this
Borrow another class' members to the prototype of this class.
Ext.define('Bank', {
money: '$$$',
printMoney: function() {
alert('$$$$$$$');
}
});
Ext.define('Thief', {
...
});
Thief.borrow(Bank, ['money', 'printMoney']);
var steve = new Thief();
alert(steve.money); // alerts '$$$'
steve.printMoney(); // alerts '$$$$$$$'
Available since: 4.0.2
Parameters
- fromClass : Ext.Base
The class to borrow members from
- members : Array/String
The names of the members to borrow
Returns
- Ext.Base
this
Starts capture on the specified Observable. All events will be passed to the supplied function with the event name + standard signature of the event before the event is fired. If the supplied function returns false, the event will not fire.
Available since: 1.1.0
Parameters
- o : Ext.util.Observable
The Observable to capture events from.
- fn : Function
The function to call when an event is fired.
- scope : Object (optional)
The scope (
thisreference) in which the function is executed. Defaults to the Observable firing the event.
Create a new instance of this Class.
Ext.define('My.cool.Class', {
...
});
My.cool.Class.create({
someConfig: true
});
All parameters are passed to the constructor of the class.
Available since: 4.0.2
Returns
- Object
the created instance.
Create aliases for existing prototype methods. Example:
Ext.define('My.cool.Class', {
method1: function() { ... },
method2: function() { ... }
});
var test = new My.cool.Class();
My.cool.Class.createAlias({
method3: 'method1',
method4: 'method2'
});
test.method3(); // test.method1()
My.cool.Class.createAlias('method5', 'method3');
test.method5(); // test.method3() -> test.method1()
Available since: 4.0.2
Parameters
- alias : String/Object
The new method name, or an object to set multiple aliases. See flexSetter
- origin : String/Object
The original method name
Get the current class' name in string format.
Ext.define('My.cool.Class', {
constructor: function() {
alert(this.self.getName()); // alerts 'My.cool.Class'
}
});
My.cool.Class.getName(); // 'My.cool.Class'
Available since: 4.0.4
Returns
- String
className
Adds members to class.
This method has been deprecated since 4.1
Use addMembers instead.
Available since: 4.0.2
Sets observability on the passed class constructor.
This makes any event fired on any instance of the passed class also fire a single event through the class allowing for central handling of events on many instances at once.
Usage:
Ext.util.Observable.observe(Ext.data.Connection);
Ext.data.Connection.on('beforerequest', function(con, options) {
console.log('Ajax request made to ' + options.url);
});
Available since: 4.0.0
Parameters
- c : Function
The class constructor to make observable.
- listeners : Object
An object containing a series of listeners to add. See addListener.
Override members of this class. Overridden methods can be invoked via callParent.
Ext.define('My.Cat', {
constructor: function() {
alert("I'm a cat!");
}
});
My.Cat.override({
constructor: function() {
alert("I'm going to be a cat!");
this.callParent(arguments);
alert("Meeeeoooowwww");
}
});
var kitty = new My.Cat(); // alerts "I'm going to be a cat!"
// alerts "I'm a cat!"
// alerts "Meeeeoooowwww"
As of 4.1, direct use of this method is deprecated. Use Ext.define instead:
Ext.define('My.CatOverride', {
override: 'My.Cat',
constructor: function() {
alert("I'm going to be a cat!");
this.callParent(arguments);
alert("Meeeeoooowwww");
}
});
The above accomplishes the same result but can be managed by the Ext.Loader which can properly order the override and its target class and the build process can determine whether the override is needed based on the required state of the target class (My.Cat).
This method has been deprecated since 4.1.0
Use Ext.define instead
Available since: 4.0.2
Parameters
- members : Object
The properties to add to this class. This should be specified as an object literal containing one or more properties.
Returns
- Ext.Base
this class
Removes all added captures from the Observable.
Available since: 1.1.0
Parameters
- o : Ext.util.Observable
The Observable to release