Methods

Methods of the DomComponent object.

beginUpdate()

Prevents the UI component from refreshing until the endUpdate() method is called.

The beginUpdate() and endUpdate() methods prevent the UI component from excessive updates when you are changing multiple UI component settings at once. After the beginUpdate() method is called, the UI component does not update its UI until the endUpdate() method is called.

See Also

defaultOptions(rule)

Specifies the device-dependent default configuration properties for this component.

Parameters:
rule:

Object

The component's default device properties.

Object structure:
Name Type Description
device

Device

|

Array<Device>

|

Function

Device parameters.
When specifying a function, get information about the current device from the argument. Return true if the properties should be applied to the device.

options

Object

Options to be applied.

defaultOptions is a static method that the UI component class supports. The following code demonstrates how to specify default properties for all instances of the Draggable UI component in an application executed on the desktop.

jQuery
JavaScript
DevExpress.ui.dxDraggable.defaultOptions({ 
    device: { deviceType: "desktop" },
    options: {
        // Here go the Draggable properties
    }
});
Angular
TypeScript
import Draggable from "devextreme/ui/draggable";
// ...
export class AppComponent {
    constructor () {
        Draggable.defaultOptions({
            device: { deviceType: "desktop" },
            options: {
                // Here go the Draggable properties
            }
        });
    }
}
Vue
<template>
    <div>
        <DxDraggable id="draggable1" />
        <DxDraggable id="draggable2" />
    </div>
</template>
<script>
import DxDraggable from "devextreme-vue/draggable";
import Draggable from "devextreme/ui/draggable";

Draggable.defaultOptions({
    device: { deviceType: "desktop" },
    options: {
        // Here go the Draggable properties
    }
});

export default {
    components: {
        DxDraggable
    }
}
</script>
React
import React, {useEffect} from "react";
import dxDraggable from "devextreme/ui/draggable";
import Draggable from "devextreme-react/draggable";

export default function App() {
    useEffect(() => { 
        dxDraggable.defaultOptions({
            device: { deviceType: "desktop" },
            options: {
                // Here go the Draggable properties
            }
        })
    });

    return (
        <div>
            <Draggable id="draggable1" />
            <Draggable id="draggable2" />
        </div>
    )
}

dispose()

Disposes of all the resources allocated to the Draggable instance.

After calling this method, remove the DOM element associated with the UI component:

JavaScript
$("#myDraggable").dxDraggable("dispose");
$("#myDraggable").remove();

Use this method only if the UI component was created with jQuery or pure JavaScript. In Angular, Vue, and React, use conditional rendering:

Angular
app.component.html
<dx-draggable ...
    *ngIf="condition">
</dx-draggable>
Vue
App.vue
<template>
    <DxDraggable ...
        v-if="condition">
    </DxDraggable>
</template>

<script>
import DxDraggable from 'devextreme-vue/draggable';

export default {
    components: {
        DxDraggable
    }
}
</script>
React
App.js
import React from 'react';

import Draggable from 'devextreme-react/draggable';

function DxDraggable(props) {
    if (!props.shouldRender) {
        return null;
    }

    return (
        <Draggable ... >    
        </Draggable>
    );
}

class App extends React.Component {
    render() {
        return (
            <DxDraggable shouldRender="condition" />
        );
    }
}
export default App;
See Also

element()

Gets the root UI component element.

Return Value:

HTMLElement | jQuery

An HTML element or a jQuery element when you use jQuery.

See Also

endUpdate()

Refreshes the UI component after a call of the beginUpdate() method.

Main article: beginUpdate()

See Also

getInstance(element)

Gets the instance of a UI component found using its DOM node.

Parameters:
element:

Element

|

jQuery

The UI component's container.

Return Value:

Object

The UI component's instance.

getInstance is a static method that the UI component class supports. The following code demonstrates how to get the Draggable instance found in an element with the myDraggable ID:

// Modular approach
import Draggable from "devextreme/ui/draggable";
...
let element = document.getElementById("myDraggable");
let instance = Draggable.getInstance(element) as Draggable;

// Non-modular approach
let element = document.getElementById("myDraggable");
let instance = DevExpress.ui.dxDraggable.getInstance(element);
See Also

instance()

Gets the UI component's instance. Use it to access other methods of the UI component.

Return Value: Draggable

This UI component's instance.

See Also

off(eventName)

Detaches all event handlers from a single event.

Parameters:
eventName:

String

The event's name.

Return Value: Draggable

The object for which this method is called.

See Also

off(eventName, eventHandler)

Detaches a particular event handler from a single event.

Parameters:
eventName:

String

The event's name.

eventHandler:

Function

The event's handler.

Return Value: Draggable

The object for which this method is called.

See Also

on(eventName, eventHandler)

Subscribes to an event.

Parameters:
eventName:

String

The event's name.

eventHandler:

Function

The event's handler.

Return Value: Draggable

The object for which this method is called.

Use this method to subscribe to one of the events listed in the Events section.

See Also

on(events)

Subscribes to events.

Parameters:
events:

Object

Events with their handlers: { "eventName1": handler1, "eventName2": handler2, ...}

Return Value: Draggable

The object for which this method is called.

Use this method to subscribe to several events with one method call. Available events are listed in the Events section.

See Also

option()

Return Value:

Object

The UI component's properties.

See Also

option(optionName)

Gets the value of a single property.

Parameters:
optionName:

String

The property's name or full path.

Return Value: any

This property's value.

See Also

option(optionName, optionValue)

Updates the value of a single property.

Parameters:
optionName:

String

The property's name or full path.

optionValue: any

This property's new value.

See Also

option(options)

Updates the values of several properties.

Parameters:
options:

Object

Options with their new values.

See Also

resetOption(optionName)

Resets a property to its default value.

Parameters:
optionName:

String

A property's name.

See Also