Handle the Value Change Event

By default, the ColorBox applies value after an end user clicks the "Apply" button. To change this behavior, assign 'instantly' to the applyValueMode property. In this case, the UI component applies the value immediately after an end user chooses a color in the drop-down editor.

jQuery

JavaScript

$(function() {
    $("#colorBoxContainer").dxColorBox({
        value: "#FF0000",
        applyValueMode: 'instantly'
    });
});

Angular

HTML

TypeScript

<dx-color-box
    [(value)]="color"
    applyValueMode="instantly">
</dx-color-box>

import { DxColorBoxModule } from "devextreme-angular";
// ...
export class AppComponent {
    color: string = "#FF0000"
}
@NgModule({
    imports: [
        // ...
        DxColorBoxModule
    ],
    // ...
})

Vue

App.vue

<template>
    <DxColorBox
        v-model:value="color"
        apply-value-mode="instantly"
    />
</template>

<script>
import 'devextreme/dist/css/dx.light.css';

import DxColorBox from 'devextreme-vue/color-box';

export default {
    components: {
        DxColorBox
    },
    data() {
        return {
            color: "#FF0000"
        };
    }
}
</script>

React

App.js

import React from 'react';
import 'devextreme/dist/css/dx.light.css';

import ColorBox from 'devextreme-react/color-box';

class App extends React.Component {
    constructor(props) {
        super(props);

        this.state = {
            color: "#FF0000"
        };
        this.handleValueChange = this.handleValueChange.bind(this); 
    }

    handleValueChange(e) {
        this.setState({
            color: e.value
        });
    }

    render() {
        return (
            <ColorBox
                value={this.state.color}
                applyValueMode="instantly"
                onValueChanged={this.handleValueChange}
            />
        );
    }
}
export default App;

To process a new ColorBox value, you need to handle the value change event. If the handling function is not going to be changed during the lifetime of the UI component, assign it to the onValueChanged property when you configure the UI component.

jQuery

JavaScript

$(function() {
    $("#colorBoxContainer").dxColorBox({
        onValueChanged: function (e) {
            const previousValue = e.previousValue;
            const newValue = e.value;
            // Event handling commands go here
        }
    });
});

Angular

HTML

TypeScript

<dx-color-box ...
    [(value)]="color"
    (onValueChanged)="handleValueChange($event)">
</dx-color-box>

import { DxColorBoxModule } from "devextreme-angular";
// ...
export class AppComponent {
    color: string = "#FF0000";

    handleValueChange (e) {
        const previousValue = e.previousValue;
        const newValue = e.value;
        // Event handling commands go here
    }
}
@NgModule({
    imports: [
        // ...
        DxColorBoxModule
    ],
    // ...
})

Vue

App.vue

<template>
    <DxColorBox
        v-model:value="color"
        @value-changed="handleValueChange"
    />
</template>

<script>
import 'devextreme/dist/css/dx.light.css';

import DxColorBox from 'devextreme-vue/color-box';

export default {
    components: {
        DxColorBox
    },
    data() {
        return {
            color: "#FF0000"
        };
    },
    methods: {
        handleValueChange: function (e) {
            const previousValue = e.previousValue;
            const newValue = e.value;
            // Event handling commands go here
        }
    }
}
</script>

React

App.js

import React from 'react';
import 'devextreme/dist/css/dx.light.css';

import ColorBox from 'devextreme-react/color-box';

class App extends React.Component {
    constructor(props) {
        super(props);

        this.state = {
            color: "#FF0000"
        };
        this.handleValueChange = this.handleValueChange.bind(this);
    }

    handleValueChange(e) {  
        const previousValue = e.previousValue;
        const newValue = e.value;
        // Event handling commands go here

        this.setState({
            color: newValue
        });
    }

    render() {
        return (
            <ColorBox
                value={this.state.color}
                onValueChanged={this.handleValueChange}
            />
        );
    }
}
export default App;

If you are going to change event handlers at runtime, or if you need to attach several handlers to the value change event, subscribe to this event using the on(eventName, eventHandler) method. This approach is more typical of jQuery.

JavaScript

const valueChangedHandler1 = function (e) {
    const previousValue = e.previousValue;
    const newValue = e.value;
    // First handler of the "valueChanged" event
};

const valueChangedHandler2 = function (e) {
    const previousValue = e.previousValue;
    const newValue = e.value;
    // Second handler of the "valueChanged" event
};

$("#colorBoxContainer").dxColorBox("instance")
    .on("valueChanged", valueChangedHandler1)
    .on("valueChanged", valueChangedHandler2);

Handle the Value Change Event

jQuery

Angular

Vue

React

jQuery

Angular

Vue

React

See Also