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Showing content from https://js.devexpress.com/React/Documentation/ApiReference/UI_Components/dxPopup/Methods/ below:

React Popup Methods | React Documentation

This section describes members used to manipulate the UI component.

Postpones rendering that can negatively affect performance until the endUpdate() method is called.

The beginUpdate() and endUpdate() methods reduce the number of renders in cases where extra rendering can negatively affect performance.

Gets the UI component's content.

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

The component's default device properties.

Object structure:

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.

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 Popup UI component in an application executed on the desktop.

DevExpress.ui.dxPopup.defaultOptions({ 
    device: { deviceType: "desktop" },
    options: {
        // Here go the Popup properties
    }
});

import Popup, { Properties } from "devextreme/ui/popup";
// ...
export class AppComponent {
    constructor () {
        Popup.defaultOptions<Properties>({
            device: { deviceType: "desktop" },
            options: {
                // Here go the Popup properties
            }
        });
    }
}

<template>
    <div>
        <DxPopup id="popup1" />
        <DxPopup id="popup2" />
    </div>
</template>
<script>
import DxPopup from "devextreme-vue/popup";
import Popup from "devextreme/ui/popup";

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

export default {
    components: {
        DxPopup
    }
}
</script>

import dxPopup from "devextreme/ui/popup";
import Popup from "devextreme-react/popup";

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

export default function App() {
    return (
        <div>
            <Popup id="popup1" />
            <Popup id="popup2" />
        </div>
    )
}

You can also set rules for multiple device types:

const devicesConfig = [
    { deviceType: 'desktop' },
    { deviceType: 'tablet' },
    { deviceType: 'phone' },
];

devicesConfig.forEach(deviceConfig => {
    DevExpress.ui.dxPopup.defaultOptions({ 
        device: deviceConfig,
        options: {
            // Here go the Popup properties
        }
    });
});

import Popup, { Properties } from "devextreme/ui/popup";
// ...
export class AppComponent {
    constructor () {
        const devicesConfig = [
            { deviceType: 'desktop' },
            { deviceType: 'tablet' },
            { deviceType: 'phone' },
        ];

        devicesConfig.forEach(deviceConfig => {
            Popup.defaultOptions<Properties>({
                device: deviceConfig,
                options: {
                    // Here go the Popup properties
                }
            });
        });
    }
}

<template>
    <div>
        <DxPopup />
    </div>
</template>
<script>
import DxPopup from "devextreme-vue/popup";
import Popup from "devextreme/ui/popup";

const devicesConfig = [
    { deviceType: 'desktop' },
    { deviceType: 'tablet' },
    { deviceType: 'phone' },
];

devicesConfig.forEach(deviceConfig => {
    Popup.defaultOptions({
        device: deviceConfig,
        options: {
            // Here go the Popup properties
        }
    });
});

export default {
    components: {
        DxPopup
    }
}
</script>

import dxPopup from "devextreme/ui/popup";
import Popup from "devextreme-react/popup";

const devicesConfig = [
    { deviceType: 'desktop' },
    { deviceType: 'tablet' },
    { deviceType: 'phone' },
];

devicesConfig.forEach(deviceConfig => {
    dxPopup.defaultOptions({
        device: deviceConfig,
        options: {
            // Here go the Popup properties
        }
    });
});

export default function App() {
    return (
        <div>
            <Popup />
        </div>
    )
}

Disposes of all the resources allocated to the Popup instance.

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

$("#myPopup").dxPopup("dispose");
$("#myPopup").remove();

Use conditional rendering instead of this method:

<dx-popup ...
    *ngIf="condition">
</dx-popup>

Use conditional rendering instead of this method:

<template>
    <DxPopup ...
        v-if="condition">
    </DxPopup>
</template>

<script>
import DxPopup from 'devextreme-vue/popup';

export default {
    components: {
        DxPopup
    }
}
</script>

Use conditional rendering instead of this method:

import React from 'react';

import Popup from 'devextreme-react/popup';

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

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

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

Gets the root UI component element.

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

The beginUpdate() and endUpdate() methods reduce the number of renders in cases where extra rendering can negatively affect performance.

Sets focus on the UI component.

This method updates the Popup's z-index and displays the Popup component on top of other overlay components.

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

The UI component's container.

The UI component's instance.

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

// Modular approach
import Popup from "devextreme/ui/popup";
...
let element = document.getElementById("myPopup");
let instance = Popup.getInstance(element) as Popup;

// Non-modular approach
let element = document.getElementById("myPopup");
let instance = DevExpress.ui.dxPopup.getInstance(element);

• 3rd-Party Frameworks Integration API

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

This UI component's instance.

Detaches all event handlers from a single event.

The object for which this method is called.

Detaches a particular event handler from a single event.

The event's name.

The event's handler.

The object for which this method is called.

Subscribes to an event.

The event's name.

The event's handler.

The object for which this method is called.

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

Subscribes to events.

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

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.

Gets the value of a single property.

The property's name or full path.

Return Value: any

This property's value.

Updates the value of a single property.

The property's name or full path.

optionValue: any

This property's new value.

Updates the values of several properties.

Options with their new values.

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

A key.

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.

Recalculates the UI component's size and position without rerendering.

Resets a property to its default value.

Shows or hides the UI component depending on the argument.

Specifies whether to show or hide the UI component.

A Promise that is resolved with true if the UI component is shown or false if it is hidden. It is a native Promise or a jQuery.Promise when you use jQuery.

You can use the toggle(showing) method instead of the show() and hide() methods. In this case, pass true or false as the method parameter to show or hide the UI component.

The UI component is automatically hidden after the time specified in the displayTime property.

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