Angular DeferRendering API

The DeferRendering is a widget that waits for its content to be ready before rendering it. While the content is getting ready, the DeferRendering displays a loading indicator.

import { DxDeferRenderingModule } from "devextreme-angular"

DevExtreme widgets are integrated with many popular libraries and frameworks. See the Installation section (for JavaScript libraries) or the Prerequisites and Installation section (for ASP.NET MVC framework) to find details on setting up DevExtreme with a particular library or framework.

The following code shows how to create the DeferRendering widget using every supported library and framework. For more details on working with widgets in these libraries and frameworks, see the Widget Basics topic for jQuery, Angular, AngularJS, Knockout or ASP.NET MVC.

jQuery
HTML
JavaScript
<div id="deferRendering">
    <!-- Widget content -->
</div>
var readyToRender = $.Deferred();
// Here goes a function that resolves the "readyToRender" Deferred object at a specific moment
// ...
$(function () {
    $("#deferRendering").dxDeferRendering({
        renderWhen: readyToRender.promise();
    });
});
Angular
HTML
TypeScript
<dx-defer-rendering
    [renderWhen]="modelReady"
>
    <!-- Widget content -->
</dx-defer-rendering>
var modelIsReady = $.Deferred();
// Here goes a function that resolves the "readyToRender" Deferred object at a specific moment
// ...
export class AppComponent
    modelReady = modelIsReady.promise();
}
AngularJS
HTML
JavaScript
<div ng-controller="DemoController">
    <div dx-defer-rendering="{
        renderWhen: modelIsReady
    }">
        <!-- Widget content -->
    </div>
</div>
var modelIsReady = $.Deferred();
// Here goes a function that resolves the "readyToRender" Deferred object at a specific moment
// ...
angular.module('DemoApp', ['dx'])
    .controller("DemoController", function ($scope) {
        $scope.modelIsReady = modelIsReady.promise();
    });
Knockout
HTML
JavaScript
<div data-bind="dxDeferRendering: {
    renderWhen: modelIsReady
}">
    <!-- Widget content -->
</div>
var modelIsReady = $.Deferred();
// Here goes a function that resolves the "readyToRender" Deferred object at a specific moment
// ...
var viewModel = {
    modelIsReady: modelIsReady.promise()
};
ko.applyBindings(viewModel);
See Also

Configuration

An object defining configuration options for the widget.

Name Description
accessKey

Specifies the shortcut key that sets focus on the widget.
activeStateEnabled

Specifies whether or not the widget changes its state when interacting with a user.
animation

Specifies the animation to be used to show the rendered content.
disabled

Specifies whether the widget responds to user interaction.
elementAttr

Specifies the attributes to be attached to the widget's root element.
focusStateEnabled

Specifies whether the widget can be focused using keyboard navigation.
height

Specifies the widget's height.
hint

Specifies text for a hint that appears when a user pauses on the widget.
hoverStateEnabled

Specifies whether the widget changes its state when a user pauses on it.
onContentReady

A handler for the contentReady event. Executed when the widget's content is ready. This handler may be executed multiple times during the widget's lifetime depending on the number of times its content changes.
onDisposing

A handler for the disposing event. Executed when the widget is removed from the DOM using the remove(), empty(), or html() jQuery methods only.
onInitialized

A handler for the initialized event. Executed only once, after the widget is initialized.
onOptionChanged

A handler for the optionChanged event. Executed after an option of the widget is changed.
onRendered

Specifies a callback function that is called when the widget's content has finished rendering but is not yet shown.
onShown

Specifies a callback function that is called when widget content is shown and animation has completed.
renderWhen

Specifies when the widget content is rendered.
rtlEnabled

Switches the widget to a right-to-left representation.
showLoadIndicator

Indicates if a load indicator should be shown until the widget's content is rendered.
staggerItemSelector

Specifies a jQuery selector of items that should be rendered using a staggered animation.
tabIndex

Specifies the number of the element when the Tab key is used for navigating.
visible

Specifies whether the widget is visible.
width

Specifies the widget's width.

Methods

This section describes members used to manipulate the widget.

Name Description
beginUpdate()

Prevents the widget from refreshing until the endUpdate() method is called.
defaultOptions(rule)

Specifies the device-dependent default configuration options for this component.
dispose()

Disposes of all the resources allocated to the DeferRendering instance.
element()

Gets the root widget element.
endUpdate()

Refreshes the widget after a call of the beginUpdate() method.
focus()

Sets focus on the widget.
getInstance(element)

Gets the instance of a widget found using its DOM node.
instance()

Gets the widget's instance. Use it to access other methods of the widget.
off(eventName)

Detaches all event handlers from a single event.
off(eventName, eventHandler)

Detaches a particular event handler from a single event.
on(eventName, eventHandler)

Subscribes to an event.
on(events)

Subscribes to events.
option()

Gets all widget options.
option(optionName)

Gets the value of a single option.
option(optionName, optionValue)

Updates the value of a single option.
option(options)

Updates the values of several options.
registerKeyHandler(key, handler)

Registers a handler to be executed when a user presses a specific key.
repaint()

Repaints the widget. Call it if you made modifications that changed the widget's state to invalid.

Events

This section describes events fired by this widget.

Name Description
contentReady

Raised when the widget's content is ready.
disposing

Raised when the widget is removed from the DOM using the remove(), empty(), or html() jQuery methods only.
initialized

Raised only once, after the widget is initialized.
optionChanged

Raised after a widget option is changed.
rendered

Fires when the widget's content has finished rendering but is not yet shown.
shown

Fires when widget content is shown and animation has completed.

See Also