Methods

This section describes members used to manipulate the 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

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 ValidationSummary UI component in an application executed on the desktop.

jQuery
JavaScript
DevExpress.ui.dxValidationSummary.defaultOptions({ 
    device: { deviceType: "desktop" },
    options: {
        // Here go the ValidationSummary properties
    }
});
Angular
TypeScript
import ValidationSummary, { Properties } from "devextreme/ui/validation_summary";
// ...
export class AppComponent {
    constructor () {
        ValidationSummary.defaultOptions<Properties>({
            device: { deviceType: "desktop" },
            options: {
                // Here go the ValidationSummary properties
            }
        });
    }
}
Vue
<template>
    <div>
        <DxValidationSummary id="validationSummary1" />
        <DxValidationSummary id="validationSummary2" />
    </div>
</template>
<script>
import DxValidationSummary from "devextreme-vue/validation-summary";
import ValidationSummary from "devextreme/ui/validation_summary";

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

export default {
    components: {
        DxValidationSummary
    }
}
</script>
React
import dxValidationSummary from "devextreme/ui/validation_summary";
import ValidationSummary from "devextreme-react/validation-summary";

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

export default function App() {
    return (
        <div>
            <ValidationSummary id="validationSummary1" />
            <ValidationSummary id="validationSummary2" />
        </div>
    )
}

dispose()

Disposes of all the resources allocated to the ValidationSummary instance.

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

JavaScript
$("#myValidationSummary").dxValidationSummary("dispose");
$("#myValidationSummary").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-validation-summary ...
    *ngIf="condition">
</dx-validation-summary>
Vue
App.vue
<template>
    <DxValidationSummary ...
        v-if="condition">
    </DxValidationSummary>
</template>

<script>
import DxValidationSummary from 'devextreme-vue/validation-summary';

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

import ValidationSummary from 'devextreme-react/validation-summary';

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

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

class App extends React.Component {
    render() {
        return (
            <DxValidationSummary 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 ValidationSummary instance found in an element with the myValidationSummary ID:

// Modular approach
import ValidationSummary from "devextreme/ui/validation_summary";
...
let element = document.getElementById("myValidationSummary");
let instance = ValidationSummary.getInstance(element) as ValidationSummary;

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

instance()

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

Return Value:

ValidationSummary

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:

ValidationSummary

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:

ValidationSummary

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:

ValidationSummary

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:

ValidationSummary

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

refreshValidationGroup()

Resubscribes the ValidationSummary to a target ValidationGroup.

Use this method if target ValidationGroup is recreated.

jQuery
index.html
index.js
<div id="container"></div>
<div id="summary"></div>
<div id="validate-group"></div>
<div id="remove-group"></div>
<div id="render-group"></div>
$(function() {

    function renderGroup() {
        $("#container").append(
            $("<div></div>").dxTextBox({}) 
            .dxValidator({
                validationRules: [{ type: 'required' }],
                validationGroup: "group"
            }),
            // Initialize other ValidationGroup members
        );
    }

    renderGroup();

    const summary = $("#summary").dxValidationSummary({
        validationGroup: "group"
    }).dxValidationSummary('instance');

    $("#validate-group").dxButton({
        text: "Validate",
        validationGroup: "group",
        onClick: function(e) {
            e.validationGroup.validate();
        }
    });

    $("#remove-group").dxButton({
        text: "Remove group",
        onClick: function() {
            $("#container").empty();
        }
    });

    $("#render-group").dxButton({
        text: "Render group",
        onClick: function() {
            renderGroup();
            summary.refreshValidationGroup(); // Refresh the subscription to ValidationGroup after rendering
        }
    });

});
Angular
app.component.html
app.component.ts
<dx-validation-group #group>
    <dx-text-box *ngIf="visible">
        <dx-validator>
            <dxi-validation-rule type="required" />
        </dx-validator>
    </dx-text-box>
    <!-- Initialize other ValidationGroup members -->
    <dx-validation-summary #summary />
</dx-validation-group>
<dx-button
    text="Validate"
    (onClick)="validate()"
>
</dx-button>
<dx-button
    text="Remove group"
    (onClick)="removeGroup()"
>
</dx-button>
<dx-button
    text="Render group"
    (onClick)="renderGroup()"
>
</dx-button>
import { Component, ViewChild } from '@angular/core';
import { DxValidationGroupComponent, DxValidationSummaryComponent } from 'devextreme-angular';

//...

export class AppComponent {
    @ViewChild('group', {static: false}) validationGroup!: DxValidationGroupComponent
    @ViewChild('summary', {static: false}) summary!: DxValidationSummaryComponent
    visible: boolean = true;
    removeGroup() {
        this.visible = false;
    }
    renderGroup() {
        this.visible = true;
        this.summary.instance.refreshValidationGroup(); // Refresh the subscription to ValidationGroup after rendering
    }
    validate() {
        this.validationGroup.instance.validate();
    }
}
Vue
App.vue
<template>
    <div id="container">
        <DxValidationGroup
            :ref="groupRefKey"
        >
            <DxTextBox v-if="visible">
                <DxValidator>
                    <DxRequiredRule />
                </DxValidator>
            </DxTextBox>
            <!-- Initialize other ValidationGroup members -->
            <DxValidationSummary 
                :ref="summaryRefKey"
            />
        </DxValidationGroup>
        <DxButton
            text="Validate"
            @click="validate"
        />
        <DxButton
            text="Remove group"
            @click="removeGroup"
        />
        <DxButton
            text="Render group"
            @click="renderGroup"
        />
    </div>
</template>

<script>
    // ...
    export default {
        // ...
        data() {
            return {
                groupRefKey: 'group',
                summaryRefKey: 'summary',
                visible: true
            }
        },
        methods: {
            validate() {
                this.validationGroup.validate();
            },
            removeGroup() {
                this.visible = false;
            },
            renderGroup() {
                this.visible = true;
                this.summary.refreshValidationGroup(); // Refresh the subscription to ValidationGroup after rendering
            }
        },
        computed: {
            validationGroup() {
                return this.$refs[this.groupRefKey].instance;
            },
            summary() {
                return this.$refs[this.summaryRefKey].instance;
            }
        }
    }
</script>
React
App.js
// ...

function App() {
    const [visible, setVisible] = useState(true);
    const validationGroup = React.createRef();
    const summary = React.createRef();
    const validate = () => {
        validationGroup.current.instance.validate();
    };
    const removeGroup = () => {
        setVisible(false);
    }
    const renderGroup = () => {
        setVisible(true);
        summary.current.instance.refreshValidationGroup(); // Refresh the subscription to ValidationGroup after rendering
    }
    return (
        <div>
            <ValidationGroup
                ref={validationGroup}
            >
                { visible && <div>
                    <TextBox>
                        <Validator>
                            <RequiredRule />
                        </Validator>
                    </TextBox>
                    {/* Initialize other ValidationGroup members */}
                </div> }
                <ValidationSummary 
                    ref={summary}
                />
            </ValidationGroup>
            <Button
                text="Validate"
                onClick={validate}
            />
            <Button
                text="Remove group"
                onClick={removeGroup}
            />
            <Button
                text="Render group"
                onClick={renderGroup}
            />
        </div>
    );
}

export default App;

repaint()

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

See Also

resetOption(optionName)

Resets a property to its default value.

Parameters:
optionName:

String

A property's name.

See Also