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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.



What's New in Sencha Cmd 6.5


Sencha Cmd 6.5 has several major and minor features and enhancements that will help streamline your development process and take advantage of the latest web technologies and get the most out of Ext JS 6.5.

ECMAScript 2015 (or ES6)

With Sencha Cmd 6.5 you can write code using arrow functions, the let keyword, object de-structuring and pretty much all the cool new features in ES6. Sencha Cmd will compile your code to run everywhere. This translation is called a "transpiler" and under the covers, Sencha Cmd uses Google's Closure Compiler to transpile your code.

Cmd also leverages all the poly-fills provided by Closure so you can also use those fancy new Array methods and not worry which browsers support them.

There are cases where you won't need all that transpiling. Maybe you’re targeting Electron or you only support modern browsers that have all these features. You can disable the transpiler and still use the Sencha Cmd code compressor against your native ES6 code. Just a tweak to the app.json file and say goodbye to the transpiler and its polyfills:

"output": {
    "js": {
        "version": "ES6"

Dynamic Package Loading

Sencha Cmd has supported the concept of packages for several years and large-scale applications often leverage packages to encapsulate classes, styling, and resources. Sencha Cmd then builds all of these pieces into your application. Now, you can use these packages in a whole new way – dynamically.

If you’re using packages today, you would see them in your app.json "requires" array:

requires: [

To switch to dynamic loading, simply move some or all of these into the "uses" array and add a new package to "requires":

requires: [
uses: [

After these changes, when Sencha Cmd builds your application, it will generate separate bundles for the application and each of the used packages. When your application loads, it will contain only its code and the code from its required packages, but not the used packages. Instead the JavaScript, CSS, and resources for these used packages will be in the application's build folder just like images or other assets.

The Ext.Package.load() method then makes it trivial to load packages when you’re ready for them. The package loader handles the package's JavaScript and CSS assets as well as recursively loading any packages that it may require.

If you’re using Ext JS routes, you might do something like this to load a package:

routes: {
    ':type': {
        before: 'loadPackage',
        action: 'showView'

loadPackage: function (type, action) {
    var view = this.getView(),
        pkg = this.getPackageForType(type);

    if (!pkg || Ext.Package.isLoaded(pkg)) {
    else {
            message: 'Loading Package...'

        Ext.Package.load(pkg).then(function () {


Using dynamic package loading can be a real time-saver for your users. No longer will they have to wait for every byte of your application to load when in reality they only needed about 20% of it. It can also save time for developers because Sencha Cmd no longer has to load all their code to make a "dev" build or watch all their code at the same time.

There are a number of new command line switches to "app build" and "app watch" to give you control over which external packages (if any) to build or watch. These allow you to slash your build times by limiting builds to only the package(s) on which you’re currently working.

See It In Action

To get you started, we’ve written a demo application that uses a handful of packages in some real-world scenarios. Check out the GitHub repo.

Progressive Web Apps

Progressive Web Apps (PWAs) provide a near-native app experience using modern web technologies. With a PWA, you can display a banner that invites Android users to install your app on their home screen. Through the magic of the service worker and its caching (currently supported in Chrome and Firefox), your app can even run offline.

Sencha Cmd streamlines the build process by providing a pre-built service worker (based on Google's ). The service worker can be configured in app.json, and its cache manifest can be augmented by Sencha Cmd using @sw-cache comments in your source code. These comments tell Cmd that you need to cache particular resources and can also configure how each asset should be managed.

PWA Example

We've pulled together a progressive web application example to show you how it all works. Check out the GitHub repo and follow the README instructions to get started. The GitHub repo contains both the Ext JS App and the Node.js based back-end server.

Project Structure

With Sencha Cmd 6.5, generated applications no longer contain the build scripts used by the "sencha app build" command. Instead of putting these in a local .sencha folder, these scripts are now loaded from the Sencha Cmd install directory.

The "sass" directory is also no longer generated for applications. Instead you can put your *.scss files in the same directory as the JavaScript files. In other words, for the Foo view, you would potentially have all these files:


It is recommended to put general or global styling in app/Application.scss or in files imported from there.

Framework Management

To streamline setting up new projects, you can take advantage of the new "sencha app init" and "sencha app install" commands and their "workspace" counterparts "sencha workspace init" and "sencha workspace install" if you have multiple applications.

All of these commands accept a path to where you have extracted Ext JS. If you download and extract all Sencha SDK's into a single folder, you can streamline these commands like so:

$ sencha config --prop sencha.sdk.path=~/sencha-sdks --save

On Windows the "~" part of the path will be replaced by something like "C:\Users\Me\".

Now that "sencha-sdks" has all the SDK zips you have downloaded and extracted, and you have saved that path using "sencha config --save" you won't need to pass --frameworks to any of the init or install commands.

Known Issues

Some users may have difficulty building their native Cordova applications after upgrading to Cmd 6.5.0. If you receive any errors related to Cordova platform configs, please manually create a file named if none exists. Then place the following code within the file and try building again:


Note: should placed in the root directory of your project.