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Getting started with JavaScript Dropdown Menu control

15 Jun 2021 / 3 minutes to read

This section explains how to create a simple DropDownButton and to configure the DropDownButton component.

Dependencies

The list of dependencies required to use the DropDownButton component in your application is given as follows:

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|-- @syncfusion/ej2-splitbuttons
    |-- @syncfusion/ej2-base
    |-- @syncfusion/ej2-popups
        |-- @syncfusion/ej2-buttons

Setup your development environment

To get started with the DropDownButton component, you can clone the Essential JS 2 quickstart project using the following commands:

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git clone https://github.com/syncfusion/ej2-quickstart.git quickstart
cd quickstart
npm install

The project is preconfigured with common settings (src/styles/styles.css, system.config.js) to start all the Essential JS 2 components.

[src/system.config.js]

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System.config({
paths: {
    'npm:': './node_modules/',
    'syncfusion:': 'npm:@syncfusion/'
},
map: {
    app: 'app',

    //Syncfusion packages mapping
    "@syncfusion/ej2-base": "syncfusion:ej2-base/dist/ej2-base.umd.min.js",
    "@syncfusion/ej2-data": "syncfusion:ej2-data/dist/ej2-data.umd.min.js",
    "@syncfusion/ej2-inputs": "syncfusion:ej2-inputs/dist/ej2-inputs.umd.min.js",
    "@syncfusion/ej2-buttons": "syncfusion:ej2-buttons/dist/ej2-buttons.umd.min.js",
    "@syncfusion/ej2-splitbuttons": "syncfusion:ej2-splitbuttons/dist/ej2-splitbuttons.umd.min.js",
    "@syncfusion/ej2-lists": "syncfusion:ej2-lists/dist/ej2-lists.umd.min.js",
    "@syncfusion/ej2-popups": "syncfusion:ej2-popups/dist/ej2-popups.umd.min.js",
    "@syncfusion/ej2-dropdowns": "syncfusion:ej2-dropdowns/dist/ej2-dropdowns.umd.min.js",
},
packages: {
    'app': { main: 'app', defaultExtension: 'js' }
}
});

System.import('app.ts').catch(console.error.bind(console)).then(function () {
document.getElementById('loader').style.display = "none";
document.getElementById('container').style.visibility = "visible";
});

Add DropDownButton to the project

Add the HTML button tag with ID attribute as the element to your index.html file.

[src/index.html]

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<!DOCTYPE html>
<html lang="en">

<head>
<title>Essential JS 2</title>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=no" />
<meta name="description" content="Essential JS 2" />
<meta name="author" content="Syncfusion" />
<link rel="shortcut icon" href="resources/favicon.ico" />
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet" />

<!--Style reference from app-->
<link href="/styles/styles.css" rel="stylesheet" />

<!--System js reference and configuration-->
<script src="node_modules/systemjs/dist/system.src.js" type="text/javascript"></script>
<script src="system.config.js" type="text/javascript"></script>
</head>

<body>
<div>
    <!--Element which is going to render-->
    <button id="element">Clipboard</button>
</div>

</body>

</html>

Then, import the DropDownButton component in your app.ts file and initialize with the #element.

[src/app/app.ts]

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import { DropDownButton, ItemModel } from '@syncfusion/ej2-splitbuttons';

//Initialize action items.
let items: ItemModel[] = [
{
    text: 'Cut'
},
{
    text: 'Copy'
},
{
    text: 'Paste'
}];

// Initialize DropDownButton component.
let drpDownBtn: DropDownButton = new DropDownButton({ items: items });

// Render initialized DropDownButton.
drpDownBtn.appendTo('#element');

Adding Style sheet to the Application

To render DropDownButton component, need to import Button and its dependent components styles as given below in style.css.

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@import "../node_modules/@syncfusion/ej2-base/styles/material.css";
@import "../node_modules/@syncfusion/ej2-buttons/styles/material.css";
@import "../node_modules/@syncfusion/ej2-popups/styles/material.css";

Run the application

Run the application in the browser using the following command:

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npm start

The following example shows a basic DropDownButton component.

Source
Preview
app.ts
index.html
styles.css
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import { DropDownButton, ItemModel } from '@syncfusion/ej2-splitbuttons';
import { enableRipple } from '@syncfusion/ej2-base';

enableRipple(true);

//Initialize action items.
let items: ItemModel[] = [
{
    text: 'Cut'
},
{
    text: 'Copy'
},
{
    text: 'Paste'
}];

// Initialize the DropDownButton component.
let drpDownBtn: DropDownButton = new DropDownButton({ items: items });

// Render initialized DropDownButton.
drpDownBtn.appendTo('#element');
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<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 DropDownButton</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript UI Controls" />
    <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-buttons/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-popups/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-splitbuttons/styles/material.css" rel="stylesheet" />
    <link href="styles.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
</head>

<body>
    <div id='loader'>LOADING....</div>
    <div id='container'>
        <button id='element'>Clipboard</button>
    </div>
</body>

</html>
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#container {
    visibility: hidden;
}

#loader {
  color: #008cff;
  height: 40px;
  left: 45%;
  position: absolute;
  top: 45%;
  width: 30%;
}

See Also