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jQuery Lookup Methods

This section describes the methods that control the Lookup UI component.

See Also

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

blur()

Removes focus from the input element.

See Also

close()

Closes the drop-down editor.

See Also

content()

Gets the popup window's content.

Return Value:

HTMLElement | jQuery

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

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

|

Function

Device parameters.
When you specify 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 Lookup UI component in an application executed on the desktop.

jQuery
JavaScript
DevExpress.ui.dxLookup.defaultOptions({ 
    device: { deviceType: "desktop" },
    options: {
        // Here go the Lookup properties
    }
});
Angular
TypeScript
import Lookup, { Properties } from "devextreme/ui/lookup";
// ...
export class AppComponent {
    constructor () {
        Lookup.defaultOptions<Properties>({
            device: { deviceType: "desktop" },
            options: {
                // Here go the Lookup properties
            }
        });
    }
}
Vue
<template>
    <div>
        <DxLookup id="lookup1" />
        <DxLookup id="lookup2" />
    </div>
</template>
<script>
import DxLookup from "devextreme-vue/lookup";
import Lookup from "devextreme/ui/lookup";

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

export default {
    components: {
        DxLookup
    }
}
</script>
React
import dxLookup from "devextreme/ui/lookup";
import Lookup from "devextreme-react/lookup";

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

export default function App() {
    return (
        <div>
            <Lookup id="lookup1" />
            <Lookup id="lookup2" />
        </div>
    )
}

dispose()

Disposes of all the resources allocated to the Lookup instance.

jQuery

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

JavaScript
$("#myLookup").dxLookup("dispose");
$("#myLookup").remove();
Angular

Use conditional rendering instead of this method:

app.component.html
<dx-lookup ...
    *ngIf="condition">
</dx-lookup>
Vue

Use conditional rendering instead of this method:

App.vue
<template>
    <DxLookup ...
        v-if="condition">
    </DxLookup>
</template>

<script>
import DxLookup from 'devextreme-vue/lookup';

export default {
    components: {
        DxLookup
    }
}
</script>
React

Use conditional rendering instead of this method:

App.js
import React from 'react';

import Lookup from 'devextreme-react/lookup';

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

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

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

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

field()

Gets the UI component's <input> element.

Return Value:

HTMLElement | jQuery

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

See Also

focus()

Sets focus to the input element representing the UI component.

See Also

getDataSource()

Gets the DataSource instance.

Return Value:

DataSource

The DataSource instance.

NOTE
This method returns the DataSource instance even if the UI component's dataSource property was given a simple array.
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 Lookup instance found in an element with the myLookup ID:

// Modular approach
import Lookup from "devextreme/ui/lookup";
...
let element = document.getElementById("myLookup");
let instance = Lookup.getInstance(element) as Lookup;

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

instance()

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

Return Value:

Lookup

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:

Lookup

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:

Lookup

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:

Lookup

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:

Lookup

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

open()

Opens the drop-down editor.

See Also

option()

Return Value:

Object

The UI component's properties.

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.

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.

option(options)

Updates the values of several properties.

Parameters:
options:

Object

Options with their new values.

registerKeyHandler(key, handler)

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

Parameters:
key:

String

A key.

handler:

Function

A handler. Accepts the keydown event as the argument. It is a EventObject or a jQuery.Event when you use jQuery.

The key argument accepts one of the following values:

  • "backspace"
  • "tab"
  • "enter"
  • "escape"
  • "pageUp"
  • "pageDown"
  • "end"
  • "home"
  • "leftArrow"
  • "upArrow"
  • "rightArrow"
  • "downArrow"
  • "del"
  • "space"
  • "F"
  • "A"
  • "asterisk"
  • "minus"

A custom handler for a key cancels the default handler for this key.

See Also

repaint()

Repaints the UI component without reloading data. Call it to update the UI component's markup.

The method repaints Toolbar and re-initializes all its items.

See Also

reset()

Resets the value property to the default value.

See Also

resetOption(optionName)

Resets a property to its default value.

Parameters:
optionName:

String

A property's name.

See Also