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Highlight the matched character in filtering in React DropDownList component

26 Nov 2021 / 2 minutes to read

By using the highlightSearch method, you can highlight the matched character in DropDownList filtering.

The following example demonstrates about how to highlight the matched character in filtering.

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import { DataManager, ODataV4Adaptor, Query } from '@syncfusion/ej2-data';
import { DropDownListComponent, FilteringEventArgs, highlightSearch } from '@syncfusion/ej2-react-dropdowns';
import * as React from 'react';
import * as ReactDOM from 'react-dom';

export default class App extends React.Component<{}, {}> {
  // bind the DataManager instance to dataSource property
  private searchData: DataManager = new DataManager({
    adaptor: new ODataV4Adaptor,
    crossDomain: true,
    url: ''
  // maps the appropriate column to fields property
  private fields: object = {
    itemCreated: this.onItemCreated.bind(this),
    text: 'ContactName', value: 'CustomerID'
  // bind the Query instance to query property
  private query: Query = new Query().select(['ContactName', 'CustomerID']).take(7);
  private queryString: string;
  constructor(props: any) {
  // highlight the item
  public onItemCreated(e: any) {
    highlightSearch(e.item, this.queryString, true, 'StartsWith');
  // filtering event handler to filter a customer
  public onFiltering(e: FilteringEventArgs) {
    // take text for highlight the character in list items.
    this.queryString = e.text;
    let query: Query = new Query().select(['ContactName', 'CustomerID']);
    // frame the query based on search string with filter type.
    query = (e.text !== '') ? query.where('ContactName', 'startswith', e.text, true) : query;
    // pass the filter data source, filter query to updateData method.
    e.updateData(this.searchData, query);

  public render() {
    return (
      // specifies the tag for render the DropDownList component
      <DropDownListComponent id="ddlelement" allowFiltering={true} popupHeight="250px" filtering={this.onFiltering = this.onFiltering.bind(this)} query={this.query} dataSource={this.searchData} fields={this.fields} placeholder="Select a customer" />
ReactDOM.render(<App />, document.getElementById('sample'));
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<!DOCTYPE html>
<html lang="en">

    <title>Syncfusion React DropDownList</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Essential JS 2 for React Components" />
    <meta name="author" content="Syncfusion" />
    <link href="//" rel="stylesheet" />
    <link href="//" rel="stylesheet" />
    <link href="//" rel="stylesheet" />
    <script src=""></script>
    <script src="systemjs.config.js"></script>
        #loader {
            color: #008cff;
            height: 40px;
            left: 45%;
            position: absolute;
            top: 45%;
            width: 30%;

    <div id='sample' style="margin: 20px auto 0; width:250px;">
        <div id='loader'>Loading....</div>