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Grouping

The ComboBox supports wrapping nested elements into a group based on different categories. The category of each list item can be mapped through the groupBy  field in the data table. The group header is displayed both as inline and fixed headers. The fixed group header content is updated dynamically on scrolling the popup list with its category value.

In the following sample, the vegetables are grouped according on its category using groupBy field.

Source
Preview
app.vue
<template>
  <div id="app">
    <div id='container' style="margin:50px auto 0; width:250px;">
        <br>
        <ejs-combobox id='combobox' :dataSource='vegetableData' :fields='fields' popupHeight="200px" placeholder="select a vegetable"></ejs-combobox>
    </div>
  </div>
</template>
<script>
import Vue from 'vue';
import { ComboBoxPlugin } from "@syncfusion/ej2-vue-dropdowns";
Vue.use(ComboBoxPlugin);

export default {
  data (){
    return {
      vegetableData: [
            { Vegetable: 'Cabbage', Category: 'Leafy and Salad', Id: 'item1' },
            { Vegetable: 'Spinach', Category: 'Leafy and Salad', Id: 'item2' },
            { Vegetable: 'Wheat grass', Category: 'Leafy and Salad', Id: 'item3' },
            { Vegetable: 'Yarrow', Category: 'Leafy and Salad', Id: 'item4' },
            { Vegetable: 'Pumpkins', Category: 'Leafy and Salad', Id: 'item5' },
            { Vegetable: 'Chickpea', Category: 'Beans', Id: 'item6' },
            { Vegetable: 'Green bean', Category: 'Beans', Id: 'item7' },
            { Vegetable: 'Horse gram', Category: 'Beans', Id: 'item8' },
            { Vegetable: 'Garlic', Category: 'Bulb and Stem', Id: 'item9' },
            { Vegetable: 'Nopal', Category: 'Bulb and Stem', Id: 'item10' },
            { Vegetable: 'Onion', Category: 'Bulb and Stem', Id: 'item11' }
      ],
      fields : { groupBy: 'Category', text: 'Vegetable', value: 'Id' }
    }
  }
}
</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>

Customization

The grouping header is also provided with customization option. This allows custom designing using the groupTemplate property for both inline and fixed headers as referred here: Group Template support to ComboBox.