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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 6.2.1 - Modern Toolkit

Guide applies to: modern

Material Theme

Ext JS 6.2 introduces a new material theme for the Modern toolkit. This theme is based on Google's Material Design, which has gained much popularity as a design foundation for many developers. It has a minimalistic look and bold colors, but also allows for enough customization for a personalized application theme.

While this theme does embrace the concepts of Material design, you may find you have questions to maintain the spec. Check out Google's Google Material Design website for reference.

Let's walk through some of the features of Material Design and how it relates to the Ext JS material theme.

Bold Color Choices


One of the most exciting parts of the Material Design is the large selection of bold colors. You can find a full swatch of color choices on the Material Design color palette page. These colors were hand-picked by designers to be aesthetically pleasing while maintaining the spirit of Material Design.

Each color is referenced by its common name (red, green, blue, etc). The colors also have multiple weights that can be used as accents for the base color.

To make things easier, the Ext JS Material Design Theme provides a material-color function that allows quick access to any color at any weight without having to look it up or use hex numbers.

Note: Our theme utilizes 300, 500, and 700 as our light, base, and dark color weights.

Customizing the color of your Ext JS application is very simple. Just set a $base-color-name and an $accent-color-name, and we will do the rest. Color combinations are then created based on the guideline, and components will respect these colors in your application.

The theme also exposes variables for every color available. After setting your base and accent colors, you can easily fine tune any aspect of your application's appearance.

Spacing and Padding


Material Design uses white space and padding to convey a separation of concerns. Occasionally, you will see thin rule lines, but generally organization is accomplished by spacing your text or imagery.

The guide uses an 8dp/px baseline grid to which all components align. Generally, you will see padding of 16dp/px throughout the theme.

Shadows and Depth


The philosophy of Material Design is to treat layers like paper. It conveys depth by casting shadows from one layer to another. When the elevation is small, the shadow will be minor. But when stacked higher, these shadows grow.

Ext JS provides the material-shadow mixin to help create shadows at different elevations. However, this should be used with caution. Adding unnecessary shadows is confusing to users and is only recommended when there is an obvious reason for a stacked effect.



Material Design uses "Roboto" as its core font. The guide also specifies a small set of sizes, line heights, and weights. The benefit of a set of font styles like this is that it’s very easy to reuse a style in various places. As a result, your application feels much more organized and planned, rather than trying to handle font styles everywhere you need to use them.

The Ext JS Material Design Theme provides the material-font-style function, which allows you to easily set the size, weight, and line height.

User Interactivity


Ripples are an important part of the animation language for Material Design. A ripple is not just aesthetic. It also provides visual feedback that a user has taken an action. Any time a user interacts with a button, a ripple will be created from the point at which they touched or clicked.

This provides feedback that the button has been pressed, but because the ripple is at the point of contact with the user, the user can feel more connected to the application.

A Truly Dynamic Theme


Starting in Ext JS 6.2, CSS variables are first-class citizens. Our core theme, Neptune, has been overhauled and provides this functionality to all themes that extend from it. The Ext JS Material Theme is the first theme to truly use the power of CSS variables and Fashion to allow for instant updates to your application’s theme.

Updating the Material Design Theme can be as simple as changing the base color at runtime. CSS variables are very powerful but are still limited in scope. This is where Fashion comes in to provide dynamic variable recalculation. Simply change your $base-color-name and Fashion will handle recalculations and set the proper CSS variables.

For more information on changing CSS variables with Fashion, check out the Fashion Documentation.

Dark Mode

Dark Mode

Another great feature of the Ext JS Material Theme is its ability to seamlessly change into dark mode. Dark Mode maintains all your base and accent color combinations but affects background and text colors.

This customization is not only available during build time but also at runtime via CSS variable dark-mode. This allows you to provide runtime customization for your users to choose the look and feel they like best.


The Ext JS Material Theme will help you modernize your application, giving it a fresh new look, bold colors, and easy color palette customization. Trying the new theme is a simple app.json edit.

Just replace this:

"theme": "theme-mountainview",

With this:

"theme": "theme-material",

Ext JS 6.2.1 - Modern Toolkit