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Getting Started

This section explains how to create a simple ComboBox component and configure its available functionalities in React.

Dependencies

The following list of dependencies are required to use the ComboBox component in your application.

|-- @syncfusion/ej2-react-dropdowns
    |-- @syncfusion/ej2-base
    |-- @syncfusion/ej2-data
    |-- @syncfusion/ej2-react-base
    |-- @syncfusion/ej2-dropdowns
        |-- @syncfusion/ej2-lists
        |-- @syncfusion/ej2-inputs
        |-- @syncfusion/ej2-popups
            |-- @syncfusion/ej2-buttons

Installation and configuration

You can use Create-react-app to setup the applications. To install create-react-app run the following command.

npm install -g create-react-app

Start a new project using create-react-app command as follows

create-react-app quickstart --scripts-version=react-scripts-ts

cd quickstart

Adding syncfusion packages

All the available Essential JS 2 packages are published in npmjs.com public registry. You can choose the component that you want to install.

To install ComboBox component, use the following command

npm install @syncfusion/ej2-react-dropdowns –save

Adding ComboBox component

Now, you can start adding ComboBox component in the application. For getting started, add the ComboBox component in src/App.tsx file using following code.

Now place the below ComboBox code in the src/App.tsx.

import * as React from 'react';
import * as ReactDOM from "react-dom";
import { ComboBoxComponent } from '@syncfusion/ej2-react-dropdowns';

export default class App extends React.Component<{}, {}> {
  render() {
    return (
       // specifies the tag for render the ComboBox component
      <ComboBoxComponent id='comboelement'></ComboBoxComponent>
    );
  }
}

ReactDOM.render(<App />, document.getElementById('sample'));

Adding CSS reference

Import the ComboBox component required CSS references as follows in src/App.css.

/* import the ComboBox dependency styles */

@import "../node_modules/@syncfusion/ej2-base/styles/material.css";
@import "../node_modules/@syncfusion/ej2-react-inputs/styles/material.css";
@import "../node_modules/@syncfusion/ej2-react-dropdowns/styles/material.css";;

Binding data source

After initialization, populate the ComboBox with data using the dataSource property. Here, an array of string values is passed to the ComboBox component.

import * as React from 'react';
import * as ReactDOM from 'react-dom';
import { ComboBoxComponent } from '@syncfusion/ej2-react-dropdowns';

export default class App extends React.Component<{}, {}> {
  // define the array of data
  private sportsData: string[] = ['Badminton', 'Cricket', 'Football', 'Golf', 'Tennis'];
  render() {
    return (
        // specifies the tag for render the ComboBox component
      <ComboBoxComponent id="comboelement" dataSource={this.sportsData} />
    );
  }
}
ReactDOM.render(<App />, document.getElementById('sample'));

Run the application

After completing the configuration required to render a basic ComboBox, run the following command to display the output in your default browser.

npm start
Source
Preview
index.tsx
index.html
import * as React from 'react';
import * as ReactDOM from 'react-dom';
import { ComboBoxComponent } from '@syncfusion/ej2-react-dropdowns';

export default class App extends React.Component<{}, {}> {
  // define the array of data
  private sportsData: string[] = ['Badminton', 'Cricket', 'Football', 'Golf', 'Tennis'];
  render() {
    return (
        // specifies the tag for render the ComboBox component
      <ComboBoxComponent id="comboelement" dataSource={this.sportsData}  placeholder="Select a game" />
    );
  }
}
ReactDOM.render(<App />, document.getElementById('sample'));
<!DOCTYPE html>
<html lang="en">

<head>
    <title>Syncfusion React ComboBox</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="//cdn.syncfusion.com/ej2/ej2-base/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-react-inputs/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-react-dropdowns/styles/material.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
    <style>
        #loader {
            color: #008cff;
            height: 40px;
            left: 45%;
            position: absolute;
            top: 45%;
            width: 30%;
        }
    </style>
</head>

<body>
    <div id='sample' style="margin: 40px auto 0; width:250px;">
        <div id='loader'>Loading....</div>
    </div>
</body>

</html>

Custom values

The ComboBox allows the user to give input as custom value which is not required to present in predefined set of values. By default, this support is enabled by allowCustom property. In this case, both text field and value field considered as same. The custom value will be sent to post back handler when a form is about to be submitted.

Source
Preview
index.tsx
index.html
import * as React from 'react';
import * as ReactDOM from 'react-dom';
import { ComboBoxComponent } from '@syncfusion/ej2-react-dropdowns';

export default class App extends React.Component<{}, {}> {
 // defined the array of data
  private sportsData: { [key: string]: Object }[] = [
    { Id: 'game1', Game: 'Badminton' },
    { Id: 'game2', Game: 'Football' },
    { Id: 'game3', Game: 'Tennis' }
  ];

   // maps the appropriate column to fields property
   private fields: object= { text: 'Game', value: 'Id' };

  render() {
    return (
      // specifies the tag for render the ComboBox component
      <ComboBoxComponent id="comboelement" fields={this.fields} dataSource={this.sportsData} allowCustom={true} placeholder="Select a game" />
    );
  }
}
ReactDOM.render(<App />, document.getElementById('sample'));
<!DOCTYPE html>
<html lang="en">

<head>
    <title>Syncfusion React ComboBox</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="//cdn.syncfusion.com/ej2/ej2-base/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-react-inputs/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-react-dropdowns/styles/material.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
    <style>
        #loader {
            color: #008cff;
            height: 40px;
            left: 45%;
            position: absolute;
            top: 45%;
            width: 30%;
        }
    </style>
</head>

<body>
    <div id='sample' style="margin: 40px auto 0; width:250px;">
        <div id='loader'>Loading....</div>
    </div>
</body>

</html>

Configure the popup list

By default, the width of the popup list automatically adjusts according to the ComboBox input element’s width, and the height of the popup list has ‘300px’.

The height and width of the popup list can also be customized using the popupHeight  and popupWidth property respectively.

In the following sample, popup list’s width and height have configured.

Source
Preview
index.tsx
index.html
import * as React from 'react';
import * as ReactDOM from 'react-dom';
import { ComboBoxComponent } from '@syncfusion/ej2-react-dropdowns';

export default class App extends React.Component<{}, {}> {
    // define the array of data
    private sportsData: string[] = ['Badminton', 'Basketball', 'Cricket', 'Football', 'Golf', 'Hockey', 'Rugby', 'Snooker', 'Tennis'];
    render() {
        return (
             // specifies the tag for render the ComboBox component
            <ComboBoxComponent id="comboelement" dataSource={this.sportsData} popupHeight="200px" popupWidth="250px" placeholder="select a game" />
        );
    }
}
ReactDOM.render(<App />, document.getElementById('sample'));
<!DOCTYPE html>
<html lang="en">

<head>
    <title>Syncfusion React ComboBox</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="//cdn.syncfusion.com/ej2/ej2-base/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-react-inputs/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-react-dropdowns/styles/material.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
    <style>
        #loader {
            color: #008cff;
            height: 40px;
            left: 45%;
            position: absolute;
            top: 45%;
            width: 30%;
        }
    </style>
</head>

<body>
    <div id='sample' style="margin: 40px auto 0; width:250px;">
        <div id='loader'>Loading....</div>
    </div>
</body>

</html>