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Terms, Icons, and Labels

Many classes have shortcut names used when creating (instantiating) a class with a configuration object. The shortcut name is referred to as an alias (or xtype if the class extends Ext.Component). The alias/xtype is listed next to the class name of applicable classes for quick reference.

Access Levels

Framework classes or their members may be specified as private or protected. Else, the class / member is public. Public, protected, and private are access descriptors used to convey how and when the class or class member should be used.

Member Types

Member Syntax

Below is an example class member that we can disect to show the syntax of a class member (the lookupComponent method as viewed from the Ext.button.Button class in this case).

lookupComponent ( item ) : Ext.Component

Called when a raw config object is added to this container either during initialization of the items config, or when new items are added), or {@link #insert inserted.

This method converts the passed object into an instanced child component.

This may be overridden in subclasses when special processing needs to be applied to child creation.


item :  Object

The config object being added.


The component to be added.

Let's look at each part of the member row:

Member Flags

The API documentation uses a number of flags to further commnicate the class member's function and intent. The label may be represented by a text label, an abbreviation, or an icon.

Class Icons

- Indicates a framework class

- A singleton framework class. *See the singleton flag for more information

- A component-type framework class (any class within the Ext JS framework that extends Ext.Component)

- Indicates that the class, member, or guide is new in the currently viewed version

Member Icons

- Indicates a class member of type config

- Indicates a class member of type property

- Indicates a class member of type method

- Indicates a class member of type event

- Indicates a class member of type theme variable

- Indicates a class member of type theme mixin

- Indicates that the class, member, or guide is new in the currently viewed version

Class Member Quick-Nav Menu

Just below the class name on an API doc page is a row of buttons corresponding to the types of members owned by the current class. Each button shows a count of members by type (this count is updated as filters are applied). Clicking the button will navigate you to that member section. Hovering over the member-type button will reveal a popup menu of all members of that type for quick navigation.

Getter and Setter Methods

Getting and setter methods that correlate to a class config option will show up in the methods section as well as in the configs section of both the API doc and the member-type menus just beneath the config they work with. The getter and setter method documentation will be found in the config row for easy reference.

History Bar

Your page history is kept in localstorage and displayed (using the available real estate) just below the top title bar. By default, the only search results shown are the pages matching the product / version you're currently viewing. You can expand what is displayed by clicking on the button on the right-hand side of the history bar and choosing the "All" radio option. This will show all recent pages in the history bar for all products / versions.

Within the history config menu you will also see a listing of your recent page visits. The results are filtered by the "Current Product / Version" and "All" radio options. Clicking on the button will clear the history bar as well as the history kept in local storage.

If "All" is selected in the history config menu the checkbox option for "Show product details in the history bar" will be enabled. When checked, the product/version for each historic page will show alongside the page name in the history bar. Hovering the cursor over the page names in the history bar will also show the product/version as a tooltip.

Search and Filters

Both API docs and guides can be searched for using the search field at the top of the page.

On API doc pages there is also a filter input field that filters the member rows using the filter string. In addition to filtering by string you can filter the class members by access level, inheritance, and read only. This is done using the checkboxes at the top of the page.

The checkbox at the bottom of the API class navigation tree filters the class list to include or exclude private classes.

Clicking on an empty search field will show your last 10 searches for quick navigation.

API Doc Class Metadata

Each API doc page (with the exception of Javascript primitives pages) has a menu view of metadata relating to that class. This metadata view will have one or more of the following:

Expanding and Collapsing Examples and Class Members

Runnable examples (Fiddles) are expanded on a page by default. You can collapse and expand example code blocks individually using the arrow on the top-left of the code block. You can also toggle the collapse state of all examples using the toggle button on the top-right of the page. The toggle-all state will be remembered between page loads.

Class members are collapsed on a page by default. You can expand and collapse members using the arrow icon on the left of the member row or globally using the expand / collapse all toggle button top-right.

Desktop -vs- Mobile View

Viewing the docs on narrower screens or browsers will result in a view optimized for a smaller form factor. The primary differences between the desktop and "mobile" view are:

Viewing the Class Source

The class source can be viewed by clicking on the class name at the top of an API doc page. The source for class members can be viewed by clicking on the "view source" link on the right-hand side of the member row.

Ext JS 6.0.0 - Modern Toolkit

Guide applies to: modern

Upgrading from Touch 2.4.x to Ext JS Modern Toolkit


This guide walks through the most important changes and their potential impact on updating your Touch applications to the Ext JS modern toolkit. There are many changes due to the modern toolkit sharing the core package, where Touch did not. If you have used Ext JS 5+, you'll probably be familiar with most of the items in this guide.

If you are new to the Ext JS side of Sencha, you may want to review our notable additions in Ext JS 5 as many of these will apply to the modern toolkit in Ext JS 6. In particular the additions and improvements to the core and charts packages are most likely relevant.

What's New in Ext JS 5

What's New in Ext JS 5.0.1

What's New in Ext JS 5.1

Sencha Cmd Upgrade Process

The first step in the upgrade process is to upgrade the ".sencha" folder and other key parts of your application. Run sencha app upgrade from your application root folder:

sencha app upgrade ../path/to/ext6

Alternatively, you can generate a stock modern app and replace its "app" folder with your own:

sencha -sdk path/to/ext6 generate app --modern YourAppName ./AppFolder

Note: Be sure to use your Touch application's App Name in place of YourAppName above.

Browser Support

The following browsers are supported by the modern toolkit.


  • IE11+
  • Firefox and Firefox ESR (Latest Versions)
  • Chrome (Latest Versions)
  • Safari 7+


  • IE11+
  • Safari 7+
  • Android 4.0+ Chrome
  • Android 4.4+ Native

Adding DOCTYPE and Meta Tags

We recommend the usage of the HTML5 doctype. We also recommend the X-UA-Compatible meta tag to ensure Internet Explorer does not activate "Compatibility Mode". The viewport meta tag is necessary for mobile devices to prevent viewport zooming from interfering with the framework's gesture recognition.

For example:

<!DOCTYPE html>
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no">

Omitting these tags may result in strange behavior and, potentially, a non-functioning application.


There is now a Sencha Cmd package named "ext" which contains the framework.

The move to being a package means the build outputs are stored in a "build" folder. This folder is useful if you want to use Ext JS directly without Sencha Cmd.

The "packages" and "src" folders are used by Sencha Cmd applications to build only what your application requires.

{theme}.js / {theme}.css

Themes may contain JavaScript overrides to tune default configs for some components. Generally, you'll need a script tag following "ext*.js" in order to include the JavaScript portion of a theme:


The -debug token is optional and, when present, selects the uncompressed JavaScript build of the theme overrides.

The compiled theme files are now present in the following folder off the root of the distribution:



"User Extensions" are provided as a starting point in building useful components. They are often useable as-is, but are intended to serve as examples of how to go beyond the core framework. The "ux" content is basically the same as before but has been converted into an "ux" package. Add "ux" the "requires" array in "app.json". If you are not using Sencha Cmd, then you'll need to add the build outputs of the "ux" package found here:


The "ux" package only builds using the theme-neptune in the modern toolkit because it is not sensitive to theme changes.



There is a minor change in DomHelper behavior with regards to generating HTML markup. For element attributes whose values are undefined, no attribute markup will be generated. When a valueless attribute is desired, use an empty string instead:

    tag: 'div',
    foo: '',
    bar: undefined

The new DOM element will look like this:

<div foo=""></div>

Ext.dom.Fly is now a separate class, and just like Ext.dom.Element, it should not be instantiated by calling the constructor. Always use to retrieve a flyweight element instance. The major change in behavior for flyweight Elements is that you can no longer attach event listeners (addListener and removeListener raise errors in development mode). Always use Ext.get() to retrieve an Element instance if it will be used to attach event listeners. Using Ext.get() adds the Element to the internal Element cache which allows its listeners to be cleared upon destruction. While adding listeners to flyweight Elements was not previously recommended, it is now prohibited.

Another minor change to the behavior of is that it will no longer allow text nodes to be wrapped, but will return null if a text node is passed. This was done for consistency with the behavior of Ext.get().

Element Selection Methods (select, query)

For better performance, we have changed the select() and query() methods to use querySelector or querySelectorAll, and have removed the Ext.dom.Query requirement. Developers who require the advanced selectors supported by Ext.dom.Query can use Ext.dom.Query directly. You may also restore the old functionality of Ext.dom.Element query() and select() methods, using an override such as the this:

Ext.define('Ext.ElementCompat', {
    override: 'Ext.dom.Element',
    requires: [ 'Ext.dom.Query' ],

    select: function(selector, composite) {
        var elements;

        if (typeof selector == "string") {
            elements =, this.dom);
        else if (selector.length !== undefined) {
            elements = selector;

        return composite ? new Ext.CompositeElement(elements)
                  : new Ext.CompositeElementLite(elements);
}, function(DQ) {
    Ext.query = function(selector, root, type, single) {
        return, root, type, single);

Element Position Query

To provide better inspection of DOM element position, Ext JS allows querying the Left, Right, Top, and Bottom of an element based on its local position and its absolute position. Previously, Element.getLeft() would always return a local coordinate. In order to achieve the same behavior, one will need to call Element.getLeft(true) to force the local coordinate system. This also applies to getRight, getTop, and getBottom.

In Sencha Touch 2.x, the following Ext.dom.Element methods returned "local" coordinates by default. Local coordinates are relative to their offsetParent. In Ext JS 6, however, these methods return "global" coordinates (relative to the page) by default:

  • getTop()
  • getRight()
  • getLeft()
  • getBottom()

Users may revert to using local coordinates by passing true as the first parameter to any of these methods, for example:


Changes to platformConfig

To provide for more control over run-time configuration the platformConfig directive has been overhauled to now work with Ext.platformTags. This is an object populated early in the framework load process with various identifiers such as phone, tablet, desktop, ios or android etc..

In Sencha Touch 2.x platformConfig was specified in the following syntax:

platformConfig: [{
    platform: 'phone',
    theme: ['Windows'],
    itemHeight: 43
    theme: ['Cupertino'],
    itemHeight: 49

In Ext JS 6, platformConfig is now an object that uses expressions as keys. Whenever the expression is true, those properties are applied. The expressions are implicitly based on the properties of Ext.platformTags.

platformConfig: {
    'phone && windows': {
        itemHeight: 43
    ios: {
        itemHeight: 49

Note: The theme is not a tag available to platformConfig. If one wished to make the theme (or other tag) available for platformConfig usage, it can be simply added using the tags property in "app.json" (perhaps in a build profile):

"builds": {
    "cupertino": {
        "toolkit": "modern",
        "theme": "theme-cupertino",

        "tags": "cupertino"  // added to platformTags for this build

Alternatively, applications can provide Ext.beforeLoad() which is given this object and it is also valid to modify it if needed. Perhaps, to add a custom tag.

<script type="text/javascript">
    var Ext = Ext || {}; // Ext namespace won't be defined yet...

    Ext.beforeLoad = function (tags) {
        // ... tags === Ext.platformTags 
        tags.custom = true;


iconCls / Pictos

The Pictos icon font is no longer included by default. It is now a separate package you'll need to require explicitly in "app.json" or "package.json" as appropriate:

"requires": [

Once required, you can use the following syntax for iconCls configs in order to use icons from the Pictos library:

// pictos-{iconName} is used to set a named icon from the Pictos icon set
iconCls: 'pictos pictos-home'

A similar requirement step and iconCls syntax will be used if you prefer to use icons from the new "font-awesome" package.

"requires": [

// fa-{iconName} is used to set a named icon from the Font Awesome icon set
iconCls: 'x-fa fa-home’

Theming Upgrade

Creating custom themes in Touch is very different than how it's handled in Ext JS. Any custom theme style rules that existed in your Touch Application will need to move into the appropriate folders.

See our Theming Guide for more information about theming Ext JS.


We are very excited to introduce our new theme compiler named Fashion. Fashion compiles most Sass code (.scss files) but is in fact not Sass. It is an extended language with additional features to improve use in tools like Sencha Inspector.

Dynamic Variables

When upgrading to Ext JS 6, the internal use of dynamic variables could impact how these variables are assigned in applications and custom themes. Although not necessary, it is recommended to change variable assignments to use dynamic(). In most cases, this will mean mechanically replacing !default (the approach taken in previous releases) with dynamic():

// before:
$base-color: green !default;

// after:
$base-color: dynamic(green);

This will make it more obvious if an error is generated based on the more restrictive nature of assignment to dynamic variables.

Compass Extensions

Compass functionality depending on Ruby code will be unavailable since Ruby is no longer being utilized. An equivalent will have to be created using JavaScript. This can be provided in many cases using require() to implement the missing functionality in JavaScript. The Sass code from Compass, however, is included in Fashion, so not all Compass functionality is impacted. Generally speaking, if you have not used any custom Compass functionality, you will most likely not need to make any changes.

See the Fashion Guide for more information.


Declarative Listeners

Previously, listeners declared on the class body would be merged at a property level with listener declarations on subclasses or instance configs. This could lead to surprising results should options like delay and buffer get merged.

Now, listeners declared on the class body will never be merged. Instead, listeners defined on subclasses, or in instance configs will be added to any existing listeners inherited from super classes and/or mixins. This enables listeners to be safely defined in a declarative manner.

In the following example all three listeners will be called:

Ext.define('SuperButton', {
    extend: 'Ext.button.Button',

    listeners: {
        click: function() {
            console.log('button clicked (superclass handler)');

Ext.define('SubButton', {
    extend: 'SuperButton',

    listeners: {
        click: function() {
            console.log('button clicked (subclass handler)');

Ext.create('SubButton', {
    renderTo: Ext.getBody(),

    text: 'click me',

    listeners: {
        click: function() {
            console.log('button clicked (instance handler)');

Users who were dependent upon the past behavior of declarative listeners that overrode their parent class's listeners will need to change their code to override the handler method instead.

Updating "before" Event Listeners

Sencha Touch and Ext JS had different approaches to before and after events. In Sencha Touch, you might see code like this:

listeners: {
    activeitemchange: 'onBeforeActiveItemChange',
    order: 'before'

This listener would be called prior to the change of active item and could veto that change by returning false. In Ext JS, the above should be changed to:

listeners: {
    beforeactiveitemchange: 'onBeforeActiveItemChange'

This would also apply to many cases using onBefore directly:

// Before:
comp.onBefore('activeitemchange', 'onBeforeActiveItemChange', this);

// After:
comp.on('beforeactiveitemchange', 'onBeforeActiveItemChange', this);

The after event order and onAfter method, which is also deprecated, are similar but should function in much the same way as in Sencha Touch.


In the core event system with Ext JS 6, the order option on listeners is deprecated and simply maps to a priority value to control the order of event listeners. While this preserves the ordering of listeners to an event, it does not have the expected result for before listeners in all cases.

This is particularly true when listening to events fired using fireAction (the implementation that was behind eventedConfigs). In Sencha Touch, the one event ("activeitemchange" for example) would be fired to all "before" listeners. If none returned false, the action function would be called and then all remaining listeners would receive the event. To handle animations and the like, the event delivery would be suspended and resumed (typically by the action function).

With Ext JS 6, this is split into two events ("beforeactiveitemchange" and "activeitemchange") and the action function is called between the two events (if no "before" event listeners returned false).

Event listening

Advanced listening features like listening directly on elements or components using wildcard and advanced selectors may not work the same. Application level event handlers using controllers or viewControllers, however, will work the same.


The scrollable config of Ext.container now configures an Ext.util.Scroller instead of an instance of Ext.scroll.View.

With many touch-enabled devices, special logic is needed to efficiently manage scrolling. To normalize all this device-specific behavior, we've added Ext.scroll.Scroller. An instance of this class is created by the framework when using configs like autoScroll, overflowX and overflowY configs, but it can now be more fully controlled using the new scrollable config.

This config can now be a config object for the Scroller. To retrieve the Scroller, you call getScrollable(). This object provides useful APIs like scrollTo and scrollBy, so you no longer need to worry about how the scrolling is managed on the current device.

The properties in a scrollable config object are transferred to configs of a Ext.util.Scroller.

Now you can use the preferable shorthand like so:

scrollable: 'x'   // equivalent to 'horizontal'
scrollable: 'y'   // equivalent to 'vertical'


The namespace is perhaps the most impacted by the merge of Ext JS and Sencha Touch.

The way to define models has changed to not require a config block, because they are not instance level configurations:

// Old
Ext.define('Order', {
    extend: '',
    config: {
        fields: ['id', {
            name: 'date',
            type: 'date'
        hasMany: 'OrderItem'

// New
Ext.define('Order', {
    extend: '',
    fields: ['id', {
        name: 'date',
        type: 'date'
    hasMany: 'OrderItem'          

The internals of have been heavily optimized to include support for calculated fields, better identity ("id" property) management, and undeclared fields.

This last item takes a bit of unpacking. Basically if the following are true for a field then that field no longer has to be listed in the fields array:

  • Needs no conversion beyond deserialization (say from JSON)
  • Has no default value
  • Does not need to be validated (at the Model level)

Properties / Configs

  • data: Undeclared model fields will remain intact where they were previously pruned in Touch. This allows Models to only define the fields that need to be processed in some way. The data object passed to the constructor simply becomes the data property and defaulting and conversions are applied in place.

  • raw: Because of the changes to the data property, there is no longer a separate raw data property tracked on each record. Should your existing applications rely on this previously reader-generated property, you can approximate the old behavior during the transition with a simple override to copy the data before it is updated:

      Ext.define('', {
          override: '',
          constructor: function (data) {
              this.raw = Ext.apply({}, data);
  • id / internalId: When a record is created and no "id" is given, one will be generated. This is handled by the Model's identifier config. This is placed as id on the record (accessed using the getId method) as well as in the data object as the idProperty. Historically, the id would often be copied to the internalId. This is no longer the case. The internalId is a separately generated value that is unique across all records and should never be changed. The id, however, may be changed.

  • clientIdProperty: clientIdProperty is now a config for writer that is used to rename "id" as it is sent to the server for create operations. If now present, the generated "id" will be sent. The server's response is used to send back the server-generated id as needed. The id sent to the server is read back using the existing clientIdProperty on Model. When using a Session, the "foreign key" fields of all associated records will be updated, if maintained within the same session.

  • modified: previously returned an empty object for the modified property if no records had changed. Accessing the Model's modified property will now return undefined if no changed records have been appended. Changes such as these allow the Data package to remain as slim as possible.

  • useCache: Sencha Touch gave users the ability to cache model instances by defining their models with the useCache config. This was replaced by to allow for better scope control over the cache. Alternatively, developers can load records via ViewModel and share it in that manner.

Users should now utilize the model's "modified" methods to ascertain change. These include:

  • isModified()

  • getModified()

  • getChanges()

  • belongsTo: belongsTo can often be simplified using the reference config on field.

  • hasMany: The typical use of hasMany is deprecated in favor of reference config on field. See below. Use of hasMany to describe child items that do not contain a foreign key is still appropriate.

  • associations: Same as above since this config is just an alternative way of expressing belongsTo and hasMany.

  • association data will not be read via the model constructor, this will need to be parsed by a reader:

      var results = MyModel.getProxy().getReader().read(rawData);
  • validations: validations are supported but deprecated for creating validators associated with a single field. Instead, use the validators config object which is keyed by field name.

  • constructor: To construct a record, you simply pass the data object. The second argument is the owning (see below).

  • drop: There is now a drop method that marks the record to be removed, but does not save it immediately.

There are several internal changes to stores in Ext JS 6. Many are inherited from Sencha Touch and others are to support chained stores.


The addrecords, removerecords and updaterecords events now become add, remove and update respectively. The add and remove events may be fired multiple times for a single operation, an event will be fired for each contiguous block of records.

// This will cause 2 remove events to be fired, one for each block of records
var records = [0, 1, 4, 5, 6, 9, 10, 12].map(function(idx) {
    return store.getAt(idx);
// Fires 4 remove events:
// 0..1
// 4..6
// 9..10
// 12

datachanged event: In some cases, previous Sencha Touch 2 releases did not always fire this event consistently. Ext JS now assures that this event is raised for all manual bulk load methods such as loadData, add, or insert. Note that this event is not raised initially when a store is instantiated with inline data: [ ].


beginUpdate / endUpdate: These methods can be called before making multiple changes to a store and after. These translate to new beginupdate and endupdate events as these transition an internal update counter from or back to 0. This allows views observing the store to defer expensive operations out to the endupdate event.


getById / getByInternalId: In Sencha Touch 2, only getByInternalId was a map lookup, and since internalId was not always the same as id, applications needed to call getById. In Sencha Touch 2, that was a linear search, but both are backed by maps.

Note: TreeStore's getById method will only search nodes that are expanded (all ancestor nodes are expanded: true -- isExpanded)

destroy / destroyStore: In Sencha Touch 2, the "destroy" method was used to send a remote request to the server to delete records. This conflicts with the common usage of "destroy" across the framework to mean to clean up resources. To bring this in line, the "destroy" method now cleans up a store. To send a delete request to the server, the "erase" method (same as model) should be used. "destroyStore" is deprecated.

Deprecated / Removed:

"buffered" config: The buffered config is supported for Ext.create and operator new, but is deprecated. It is recommended to create a buffered store using type: 'buffered'. If you are deriving a store from, the buffered config is not supported. Instead derive from Here's an example of a grid store config:

store: {
    type: 'buffered',  // was "buffered: true",

groupers: Support for multiple grouping levels was never realized in Sencha Touch 2 and groupers was really nothing more than extra sorters. This has been replaced by the grouper config and the getGroupString method that was previously configured on the store is now configured on the grouper. The internal structures are now much closer to being able to support nested groupers and this config will most likely be restored when that functionality is available. has now been split into four subclasses, one for each type of CRUD operation. These operation classes should be used in favor of directly.


  • "destroy" / "erase": Similar to model & store, the destroy() method has been corrected to mean clean up any resources. To send a delete request to the server, the erase method should be used.

  • "doRequest": Now takes a single argument, an Callbacks should be attached to operation directly.

Proxy CRUD

One could previously pass a callback and scope into proxy CRUD methods. This has been removed. The callback from the proxy would return the operation where now one would use a callback on the operation which returns the results instead.


  • writeAllFields: The default for this config was true and is now false to optimize data transfer. This config is used to tell the Writer to send all fields on an update even if those fields have not changed.

One of the biggest changes to fields is that the various field types are now defined as classes in a small class hierarchy*. Now you can write custom field types and use them in your Models by simply giving them an alias (for example, and using that name as the type config on a field (for example, 'foo').

  • depends: You can now declare the field names that a convert function uses to calculate its value and this field will automatically be updated whenever any of these fields are set.

  • calculate: This new config allows you to write a simple function that produces the value of a field given the record's data object. Instead of declaring a convert function and the depends array, this text of this function is parsed to extract the field dependencies.

  • reference: To make it simple to relate one Model with another, when a field contains the id of another record (a "foreign key"), you can add this config and simply give the name of the Model being referenced. This is enough to populate association data for both this Model and the referenced Model.

  • validators: This config is typically used when deriving a custom field type, but this is an easy way to list the rules that describe a valid field value.

  • useNull: This config is now named allowNull.

The ability to derive custom field types replaces the static class, which has been deprecated.

Has been replaced by*.

Sessions (NEW)

The new Session class will help manage editing of multiple records and their associations. If you are manually saving records and stores and have to work out the proper sequence to save all of your edits, the Session class will likely be very helpful. Check out the API documentation on to determine if you might benefit from coordinated Model management.

Schema (NEW)

Collecting and managing all of your Model definitions and their associations is now handled by the Schema class The Schema class knows, for example, when one class declares an association with another and ensures that both classes are "decorated" with appropriate accessor methods - regardless of the order in which those classes are loaded.

ModelManager (DEPRECATED)

The class is deprecated. Its features have been replaced by


The way you declare associations has been streamlined. The old syntax is supported but, in many cases, field's new "reference" config makes the declaration much simpler. Further, Ext JS now supports "Many-To-Many" associations using the ManyToMany Model config.* (REPLACED)

The contents of this namespace have been replaced by Schema. Direct use of these classes in applications is rare and the configs that corresponded to these classes ("belongsTo", etc) are still supported though most deprecated.


We have removed Ext.plugin.BufferedList. Please use infinite: true on list instead.


Using mainView is the preferred way to launch your application. While you can still utilize the launch method, it's more tool friendly to use mainView.

The mainView config can, however, conflict with a "Main" view listed in the views array:

views: [
    'Main'   // generated getter conflicts with mainView config getter

To resolve this conflict, you can:

  • Switch the Main view to be created via the mainView config.
  • Rename the Main view.
  • Remove the "Main" entry in the views array (and check calls to getMainView).


Previously in Touch the Viewport was available at the time of onReady. ExtJS 6+ now has an event that fires when the Viewport is ready.

Ext.on('viewportready', cb);

Using the viewportready event will allow users to access the viewport as soon as it is created from anywhere in there application.

Removed Ext.DateExtras

The Ext.DateExtras singleton class has been removed. Most of the methods found in Ext.DateExtras can be found in Ext.Date instead. has been removed

Use At present, may not support Create, Write and Delete operations. However, we are in process of making modern components accept BufferedStores.

Legacy Package

We have created a legacy package that contains no longer supported code (like Ext.device.*, see below). The intent of the legacy package is to give users a chance to update their code before the code they may have used is completely removed.

Ext.device.* API have been moved to legacy package

We have removed the Sencha Touch device API's from the modern toolkit, but they can still be utilized by requiring the legacy package. While Ext.device.* can still be used, we recommend using native HTML5 API's or, for native packaged applications, Cordova or PhoneGap APIs are the preferred method of providing native device support. has been removed was based on webSQL, which is no longer being developed. Additionally, it's only supported in webkit browsers.

Charts Package


Ext.draw.Component has changed to Ext.draw.Container.

Instance IDs

As part of our performance optimization efforts in Ext JS 6, we have removed the overhead for handling identifiers with invalid characters from certain core areas. To help catch such ids before they fail, we have added checks in key places such as Ext.get() and the Ext.Component constructor. These checks use Ext.validIdRe, which is defined as:

validIdRe: /^[a-z_][a-z0-9\-_]*$/i

In a nutshell, create ids that adhere to the above regex in order to future-proof your application.


Ext.ComponentManager is seldom used directly by applications, but its internals have been streamlined and it no longer provides a HashMap of components. Instead look at the methods this class provides to access the registered components.


Ext.Container API has been changed to be more consistent with Ext.container.Container API in Classic toolkit. The changes include:

  • When calling add method with multiple items to add, the return value will be an array of Ext.Component instances that were added to the Container.
  • remove method accepts three types of item selectors: an Ext.Component instance, itemId of a child Component, or numeric index of the child Component in the items collection.
  • remove method will return the removed item instead of this.
  • removeAll method will return an array of removed items instead of this.
  • removeAt method will return the removed Component instead of this.
  • removeInnerAt method will return the removed Component instead of this.

Ext.mixin.Selectable (affects Ext.dataview.DataView, Ext.List, Ext.grid.Grid & subclasses)

The getSelection method now returns a single record, the most recently selected one. This can be used for databinding:

    xtype: 'formpanel',
    items: [{
        xtype: 'textfield',
        bind: '{}'

Use getSelections to return an[] that has all selected records.


Ext.field.Text (and subclasses)

The change event now fires immediately as the input changes, instead of when the field blurs. To have a delay to capture multiple change events in succession, use a buffer on the listener:

listeners: {
    // Each time the change occurs, it will wait 500ms. If no other change has happened in
    // that period, the event will fire. Otherwise, if a change does happened, the timer will
    // be reset and the process will repeat
    buffer: 500, 
    change: function() {}


The check and uncheck events no longer pass the event object as it was only available under some circumstances, the event was fired whether the change occurred via the UI or not.

Ext.field.DatePicker, Ext.field.Select

This class no longer extends Ext.field.Select, the picker related functionality has been abstracted into Ext.field.Picker, both of these classes now extend Ext.field.Picker.


This class has been introduced to assist with data binding. It is very similar to the superclass, Ext.field.Slider, however the getValue method and value binding always return a Number, not a Number[].


The change event is now consistent with other form fields, the the signature is now:

change: function(field, newValue, oldValue) {}

What was previously the change event is now named dragchange.

A new liveUpdate config was added to determine when the change event fires, either real time as the slider is modified, or when the drag is complete.


The type of value for this field is now a Boolean. It will still accept numeric values.



To veto a drag, listen to the beforedragstart event and return false. In previous versions this would be done in the dragstart event.


As you can see, there are many new additions for users moving from Touch to the Modern toolkit. As always, if you have questions regarding guide content, be sure to ask on the community forums or by submitting a Support ticket through the Support Portal (Sencha Support customer access only).

Ext JS 6.0.0 - Modern Toolkit