Vue 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.

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>

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.

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>

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