Angular SelectBox - Handle the Value Change Event

The SelectBox value changes when the change event raises. If you need the value to be changed on another event, set the customItemCreateEvent property.

jQuery
JavaScript
const selectBoxData = [
    { id: 1, country: "Afghanistan" },
    { id: 2, country: "Albania" },
    // ...
];

$(function() {
    $("#selectBoxContainer").dxSelectBox({
        dataSource: selectBoxData,
        valueExpr: 'id',
        displayExpr: 'country',
        acceptCustomValue: true,
        customItemCreateEvent: 'keyup'
    });
});
Angular
HTML
TypeScript
<dx-select-box
    [dataSource]="selectBoxData"
    valueExpr="id"
    displayExpr="country"
    [acceptCustomValue]="true"
    customItemCreateEvent="keyup">
</dx-select-box>
import { DxSelectBoxModule } from "devextreme-angular";
// ...
export class AppComponent {
    selectBoxData = [
        { id: 1, country: "Afghanistan" },
        { id: 2, country: "Albania" },
        // ...
    ];
}
@NgModule({
     imports: [
         // ...
         DxSelectBoxModule
     ],
     // ...
 })
Vue
App.vue
<template> 
    <DxSelectBox ...
        :data-source="selectBoxData"
        display-expr="country"
        value-expr="id"
        :accept-custom-value="true",
        custom-item-create-event="keyup"
    />
</template>

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

import { DxSelectBox } from 'devextreme-vue/select-box';

export default {
    components: {
        DxSelectBox
    },
    data() {
        const selectBoxData = [
            { id: 1, country: "Afghanistan" },
            { id: 2, country: "Albania" },
            // ...
        ];
        return {
            selectBoxData
        }
    }
}
</script>
React
App.js
import React from 'react';
import 'devextreme/dist/css/dx.light.css';

import SelectBox from 'devextreme-react/select-box';

const selectBoxData = [
    { id: 1, country: "Afghanistan" },
    { id: 2, country: "Albania" },
    // ...
];

class App extends React.Component {
    render() {
        return (
            <SelectBox ...
                dataSource={selectBoxData} 
                displayExpr="country"
                valueExpr="id"
                acceptCustomValue={true}
                customItemCreateEvent="keyup"
            />
        );
    }
}
export default App;

To process a new SelectBox 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() {
    $("#selectBoxContainer").dxSelectBox({
        onValueChanged: function (e) {
            const previousValue = e.previousValue;
            const newValue = e.value;
            // Event handling commands go here
        }
    });
});
Angular
HTML
TypeScript
<dx-select-box ...
    (onValueChanged)="onValueChanged($event)">
</dx-select-box>
import { DxSelectBoxModule } from "devextreme-angular";
// ...
export class AppComponent {
    onValueChanged (e) {
        const previousValue = e.previousValue;
        const newValue = e.value;
        // Event handling commands go here
    }
}
@NgModule({
     imports: [
         // ...
         DxSelectBoxModule
     ],
     // ...
 })
Vue
App.vue
<template> 
    <DxSelectBox ...
        @value-changed="valueChanged"
    />
</template>

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

import { DxSelectBox } from 'devextreme-vue/select-box';

export default {
    components: {
        DxSelectBox
    },
    methods: {
        valueChanged(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 SelectBox from 'devextreme-react/select-box';

class App extends React.Component {
    constructor(props) {
        super(props);
        this.valueChanged = this.valueChanged.bind(this);
    }
    valueChanged(e) {
        const previousValue = e.previousValue;
        const newValue = e.value;
        // Event handling commands go here
    }
    render() {
        return (
            <SelectBox ...
                onValueChanged={this.valueChanged}
            />
        );
    }
}
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
};

$("#selectBoxContainer").dxSelectBox("instance")
    .on("valueChanged", valueChangedHandler1)
    .on("valueChanged", valueChangedHandler2);
See Also
jQuery
Angular
Vue
React