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Add Items in Vue ListBox component

To add an item or multiple items, addItems method can be used. In the following example, the Bugatti Veyron Super Sport and SSC Ultimate Aero items will be added while clicking Add Items button.

Source
Preview
app.vue
<template>
  <div id="app">
    <div id='container' style="margin:10px auto 0; width:250px;">
        <ejs-listbox id="listbox" :dataSource='data'  ></ejs-listbox>
        <button id="additem" class="e-btn" v-on:click="additem">Add Items</button>
    </div>
  </div>
</template>
<script>
import Vue from 'vue';
import { ListBoxPlugin } from "@syncfusion/ej2-vue-dropdowns";

Vue.use(ListBoxPlugin);
export default {
  data (){
    return {
       data: [
    { text: 'Hennessey Venom', id: 'list-01' },
    { text: 'Bugatti Chiron', id: 'list-02' },
    { text: 'Koenigsegg CCR', id: 'list-05' },
    { text: 'McLaren F1', id: 'list-06' },
    { text: 'Aston Martin One- 77', id: 'list-07' },
    { text: 'Jaguar XJ220', id: 'list-08' },
    { text: 'McLaren P1', id: 'list-09' },
    { text: 'Ferrari LaFerrari', id: 'list-10' },
];
    }
  },
  methods:{
    additem: function(e){
        var items = ["Bugatti Veyron Super Sport", "SSC Ultimate Aero"]
        var listboxobj = document.getElementById("listbox").ej2_instances[0];
        if (!listboxobj.getDataByValue('Bugatti Veyron Super Sport')) {
        listboxobj.addItems([{ text: 'Bugatti Veyron Super Sport', id: 'list-03' }, { text: 'SSC Ultimate Aero', id: 'list-04' }]);
    }
  }
}

</script>
<style>
@import "../../node_modules/@syncfusion/ej2-base/styles/material.css";
@import "../../node_modules/@syncfusion/ej2-vue-inputs/styles/material.css";
@import "../../node_modules/@syncfusion/ej2-vue-dropdowns/styles/material.css";
</style>