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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 6.2.0 - Classic Toolkit

Guide applies to: classic

Localization in Ext JS

Communicating with users in a language that they understand and with conventions that they're used to is vital. Ext JS includes a localization package that helps developers easily localize applications for many non-English languages.


You'll find all of the bundled locale files in the override folder of the ext-locale package. Locale files are just overrides that tell Ext JS to replace the default English values of certain components. These are generally things like date formats, month and day names, etc.

The date picker is a perfect example. Here's an excerpt from the Spanish localization file:

Ext.define("", {
    override: "Ext.picker.Date",
    todayText: "Hoy",
    minText: "Esta fecha es anterior a la fecha mínima",
    maxText: "Esta fecha es posterior a la fecha máxima",
    disabledDaysText: "",
    disabledDatesText: "",
    nextText: 'Mes Siguiente (Control+Right)',
    prevText: 'Mes Anterior (Control+Left)',
    monthYearText: 'Seleccione un mes (Control+Up/Down para desplazar el año)',
    todayTip: "{0} (Barra espaciadora)",
    format: "d/m/Y",
    startDay: 1

Localization with Sencha Cmd

To implement localization, simply modify the app.json file in your Sencha Cmd generated classic toolkit based application. You'll want to add the "ext-locale" package to the requires block. The resulting addition should look like this:

 * The list of required packages (with optional versions; default is "latest").
 * For example,
 *      "requires": [
 *          "sencha-charts"
 *      ]
"requires": [

Note: If you're using a Universal application, you'll need to add the locale requirement to your classic toolkit's require's array:

"classic": {
    "requires": [

Your application is now ready for localization. The next step is to determine the language that you are interested in including. All you need to do is create a locale setting. Simply add the following line to your app.json file:

"locale": "es", 

Note: The locale setting is not a default entry. You will need to add this to your app.json file manually.

Now that your app.json is updated, you can run sencha app build and Sencha Cmd will process the changes. Upon refreshing, you should see that any component with English values now contains Spanish values.

Localization without Sencha Cmd

The simplest way to localize Ext JS without Sencha Cmd is to include the locale file in your index file.

<!DOCTYPE html>
    <!-- Ensure we're using UTF-8 -->
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    <title>Localization example</title>
    <!-- Main Ext JS files -->
    <link rel="stylesheet" type="text/css" href="resources/ext-theme-neptune-all.css">
    <script type="text/javascript" src="ext-all.js"></script>      

    <!-- Include the translations -->
    <script type="text/javascript" src="ext-locale-es.js"></script>

    <script type="text/javascript">
        Ext.onReady(function() {
            Ext.create('Ext.picker.Date', {
                renderTo: Ext.getBody()

Localizing your Ext JS Extensions

You'll want to ensure that you follow Ext JS best practices for localization when you write a custom component or plug-in. At the very minimum, every text string that's shown to users should be defined as a property:

Ext.define("Ext.ux.Weather", {
    sunText: "It's a nice sunny day",
    rainText: "Bad weather, don't go out",
    // ...other code...

Localizing Dates

You'll want to pay extra care when working with dates. Every language tends to have it's own way of writing them. When your extension renders a date, provide a config option to specify the format. This way users of your extension can easily override the locale-specific parts.

Native Localization

You can avoid the need for most localization by using components with messages already translated in Ext JS itself (e.g. use buttonText when rendering "OK" button).

Custom Localization

If you have defined application classes with text fields, labels, or other localization codes, you will need to override them with customized locale overrides.

The first step is to create a directory in which you will place all your locale overrides. For example, you may wish to put all language overrides in a 'locale' directory within your application. This directory would contain subdirectories for each language, corresponding to the locale code (e.g. Spanish overrides in locale/es, French in locale/fr, etc.).

The most important part of this step is to ensure that you isolate each set of language overrides in a directory that matches the value you specify as the locale property in your app.json file.

Once you have created your locale directory structure and your overrides, you need to tell Sencha Cmd to add these classes during the build process.

If you've followed the above convention, you can add the following configuration to your app.json overrides property:

"overrides": "${app.dir}/overrides,${app.dir}/locale/${app.locale}",

This will allow Sencha Cmd to recursively add all of the class files found under the locale/xx directory, where xx is the locale code specified under locale in the app.json file.

Ext JS 6.2.0 - Classic Toolkit