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Getting started with JavaScript (ES5) DropDownList control

30 Mar 2023 / 6 minutes to read

The Essential JS 2 for JavaScript (global script) is an ES5 formatted pure JavaScript framework which can be directly used in latest web browsers.

Dependencies

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

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

Component Initialization

The Essential JS 2 JavaScript components can be initialized by using either of the following ways.

  • Using local script and style references in a HTML page.
  • Using CDN link for script and style reference.

Using local script and style references in a HTML page

Step 1: Create an app folder myapp for Essential JS 2 JavaScript components.

Step 2: You can get the global scripts and styles from the Essential Studio JavaScript (Essential JS 2) build installed location.

Syntax:

Script: **(installed location)**/Syncfusion/Essential Studio/{RELEASE_VERSION}/Essential JS 2/{PACKAGE_NAME}/dist/global/{PACKAGE_NAME}.min.js

Styles: **(installed location)**/Syncfusion/Essential Studio/{RELEASE_VERSION}/Essential JS 2/{PACKAGE_NAME}/styles/material.css

Example:

Script: C:/Program Files (x86)/Syncfusion/Essential Studio/15.4.30/Essential JS 2/ej2-dropdowns/dist/global/ej2-dropdowns.min.js

Styles: C:/Program Files (x86)/Syncfusion/Essential Studio/15.4.30/Essential JS 2/ej2-dropdowns/styles/material.css

Step 3: Create a folder myapp/resources and copy/paste the global scripts and styles from the above installed location to myapp/resources location.

Step 4: Create a HTML page (index.html) in myapp location and add the Essentials JS 2 script and style references.

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<!DOCTYPE html>
  <html xmlns="http://www.w3.org/1999/xhtml">
   <head>
        <title>Essential JS 2</title>
        <!-- Essential JS 2 material theme -->
        <link href="resources/base/styles/material.css" rel="stylesheet" type="text/css"/>
        <link href="resources/inputs/styles/material.css" rel="stylesheet" type="text/css"/>
        <link href="resources/lists/styles/material.css" rel="stylesheet" type="text/css"/>
        <link href="resources/popups/styles/material.css" rel="stylesheet" type="text/css"/>
        <link href="resources/buttons/styles/material.css" rel="stylesheet" type="text/css"/>
        <link href="resources/dropdowns/styles/material.css" rel="stylesheet" type="text/css"/>

        <!-- Essential JS 2 DropDownList's dependent scripts -->
        <script src="resources/ej2-base.min.js" type="text/javascript"></script>
        <script src="resources/ej2-data.min.js" type="text/javascript"></script>
        <script src="resources/ej2-inputs.min.js" type="text/javascript"></script>
        <script src="resources/ej2-lists.min.js" type="text/javascript"></script>
        <script src="resources/ej2-popups.min.js" type="text/javascript"></script>
        <script src="resources/ej2-buttons.min.js" type="text/javascript"></script>
        <!-- Essential JS 2 DropDownList's global script -->
        <script src="resources/ej2-dropdowns.min.js" type="text/javascript"></script>
   </head>
   <body>
   </body>
  </html>

Step 5: Now, add the input element and initiate the Essential JS 2 DropDownList component in the index.html by using following code

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<!DOCTYPE html>
  <html xmlns="http://www.w3.org/1999/xhtml">
   <head>
        <title>Essential JS 2</title>
        <!-- Essential JS 2 material theme -->
        <link href="resources/base/styles/material.css" rel="stylesheet" type="text/css"/>
        <link href="resources/inputs/styles/material.css" rel="stylesheet" type="text/css"/>
        <link href="resources/lists/styles/material.css" rel="stylesheet" type="text/css"/>
        <link href="resources/popups/styles/material.css" rel="stylesheet" type="text/css"/>
        <link href="resources/buttons/styles/material.css" rel="stylesheet" type="text/css"/>
        <link href="resources/dropdowns/styles/material.css" rel="stylesheet" type="text/css"/>

        <!-- Essential JS 2 DropDownList's dependent scripts -->
        <script src="resources/ej2-base.min.js" type="text/javascript"></script>
        <script src="resources/ej2-data.min.js" type="text/javascript"></script>
        <script src="resources/ej2-inputs.min.js" type="text/javascript"></script>
        <script src="resources/ej2-lists.min.js" type="text/javascript"></script>
        <script src="resources/ej2-popups.min.js" type="text/javascript"></script>
        <script src="resources/ej2-buttons.min.js" type="text/javascript"></script>
        <!-- Essential JS 2 DropDownList's global script -->
        <script src="resources/ej2-dropdowns.min.js" type="text/javascript"></script>
   </head>
  <body>
       <!-- Add the HTML <input> element  -->
         <input type="text" id='ddl' />
        <script>
        // initialize DropDownList component
        var dropDownList = new ej.dropdowns.DropDownList();
        // Render initialized DropDownList.
        dropDownList.appendTo('#ddl');
        </script>
   </body>
  </html>

Step 6: Now, run the index.html in web browser, it will render the Essential JS 2 DropDownList component.

Step 1: Create an app folder myapp for the Essential JS 2 JavaScript components.

Step 2: The Essential JS 2 component’s global scripts and styles are already hosted in the below CDN link formats.

Syntax:

Script: http://cdn.syncfusion.com/ej2/21.1.35/{PACKAGE_NAME}/dist/global/{PACKAGE_NAME}.min.js

Styles: http://cdn.syncfusion.com/ej2/21.1.35/{PACKAGE_NAME}/styles/material.css

Example:

Script: http://cdn.syncfusion.com/ej2/21.1.35/ej2-dropdowns/dist/global/ej2-dropdowns.min.js

Styles: http://cdn.syncfusion.com/ej2/21.1.35/ej2-dropdowns/styles/material.css

Step 3: Create a HTML page (index.html) in myapp location and add the CDN link references. Now, add the input element and initiate the Essential JS 2 DropDownList component in the index.html by using following code.

Source
Preview
index.html
Copied to clipboard
<!DOCTYPE html>
  <html xmlns="http://www.w3.org/1999/xhtml">
   <head>
                
        <title>Essential JS 2</title>
<!-- Essential JS 2 DropDownList's dependent material theme -->
        <link href="//cdn.syncfusion.com/ej2/21.1.35/ej2-base/styles/material.css" rel="stylesheet" type="text/css"/>
        <link href="//cdn.syncfusion.com/ej2/21.1.35/ej2-inputs/styles/material.css" rel="stylesheet" type="text/css"/>
        <link href="//cdn.syncfusion.com/ej2/21.1.35/ej2-dropdowns/styles/material.css" rel="stylesheet" type="text/css"/>

        <!-- Essential JS 2 all script -->
        <!-- <script src="https://cdn.syncfusion.com/ej2/21.1.35/dist/ej2.min.js" type="text/javascript"></script> -->

        <!-- Essential JS 2 DropDownList's dependent scripts -->
        <script src="//cdn.syncfusion.com/ej2/21.1.35/ej2-base/dist/global/ej2-base.min.js" type="text/javascript"></script>
        <script src="//cdn.syncfusion.com/ej2/21.1.35/ej2-data/dist/global/ej2-data.min.js" type="text/javascript"></script>
        <script src="//cdn.syncfusion.com/ej2/21.1.35/ej2-inputs/dist/global/ej2-inputs.min.js" type="text/javascript"></script>
        <script src="//cdn.syncfusion.com/ej2/21.1.35/ej2-buttons/dist/global/ej2-buttons.min.js" type="text/javascript"></script>
        <script src="//cdn.syncfusion.com/ej2/21.1.35/ej2-lists/dist/global/ej2-lists.min.js" type="text/javascript"></script>
        <script src="//cdn.syncfusion.com/ej2/21.1.35/ej2-popups/dist/global/ej2-popups.min.js" type="text/javascript"></script>
        <script src="//cdn.syncfusion.com/ej2/21.1.35/ej2-dropdowns/dist/global/ej2-dropdowns.min.js" type="text/javascript"></script>
   </head>
   <body>
       <!-- Add the HTML <input> element  -->
         <input type="text" tabindex="1" id='ddl' />
        <script>
        // initialize DropDownList component
        var dropDownList = new ej.dropdowns.DropDownList();
        // Render initialized DropDownList.
        dropDownList.appendTo('#ddl');
        </script>
   </body>
  </html>

Step 4: Now, run the index.html in web browser, it will render the Essential JS 2 DropDownList component.

Binding data source

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

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<!DOCTYPE html>
  <html xmlns="http://www.w3.org/1999/xhtml">
   <head>
        <title>Essential JS 2</title>
        <!-- Essential JS 2 DropDownList's dependent material theme -->
        <link href="//cdn.syncfusion.com/ej2/21.1.35/ej2-base/styles/material.css" rel="stylesheet" type="text/css"/>
        <link href="//cdn.syncfusion.com/ej2/21.1.35/ej2-inputs/styles/material.css" rel="stylesheet" type="text/css"/>
        <link href="//cdn.syncfusion.com/ej2/21.1.35/ej2-dropdowns/styles/material.css" rel="stylesheet" type="text/css"/>

        <!-- Essential JS 2 all script -->
        <!-- <script src="https://cdn.syncfusion.com/ej2/21.1.35/dist/ej2.min.js" type="text/javascript"></script> -->

        <!-- Essential JS 2 DropDownList's dependent scripts -->
        <script src="//cdn.syncfusion.com/ej2/21.1.35/ej2-base/dist/global/ej2-base.min.js" type="text/javascript"></script>
        <script src="//cdn.syncfusion.com/ej2/21.1.35/ej2-data/dist/global/ej2-data.min.js" type="text/javascript"></script>
        <script src="//cdn.syncfusion.com/ej2/21.1.35/ej2-inputs/dist/global/ej2-inputs.min.js" type="text/javascript"></script>
        <script src="//cdn.syncfusion.com/ej2/21.1.35/ej2-buttons/dist/global/ej2-buttons.min.js" type="text/javascript"></script>
        <script src="//cdn.syncfusion.com/ej2/21.1.35/ej2-lists/dist/global/ej2-lists.min.js" type="text/javascript"></script>
        <script src="//cdn.syncfusion.com/ej2/21.1.35/ej2-popups/dist/global/ej2-popups.min.js" type="text/javascript"></script>
        <script src="//cdn.syncfusion.com/ej2/21.1.35/ej2-dropdowns/dist/global/ej2-dropdowns.min.js" type="text/javascript"></script>
   </head>
   <body>
       <!-- Add the HTML <input> element  -->
         <input type="text" tabindex="1" id='ddl' />
        <script>
        let sportsData = ['Badminton', 'Basketball', 'Cricket', 'Football', 'Golf', 'Gymnastics', 'Hockey', 'Rugby', 'Snooker', 'Tennis'];
        // initialize DropDownList component
        var listObj = new ej.dropdowns.DropDownList({
            //set the data to dataSource property
              dataSource: sportsData});
          listObj.appendTo('#ddl');
        </script>
   </body>
  </html>

Configure the popup list

By default, the width of the popup list automatically adjusts according to the DropDownList 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 properties respectively.

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

Source
Preview
index.html
Copied to clipboard
<!DOCTYPE html>
  <html xmlns="http://www.w3.org/1999/xhtml">
   <head>
                
        <title>Essential JS 2</title>
        <!-- Essential JS 2 DropDownList's dependent material theme -->
        <link href="//cdn.syncfusion.com/ej2/21.1.35/ej2-base/styles/material.css" rel="stylesheet" type="text/css"/>
        <link href="//cdn.syncfusion.com/ej2/21.1.35/ej2-inputs/styles/material.css" rel="stylesheet" type="text/css"/>
        <link href="//cdn.syncfusion.com/ej2/21.1.35/ej2-dropdowns/styles/material.css" rel="stylesheet" type="text/css"/>

        <!-- Essential JS 2 all script -->
        <!-- <script src="https://cdn.syncfusion.com/ej2/21.1.35/dist/ej2.min.js" type="text/javascript"></script> -->

        <!-- Essential JS 2 DropDownList's dependent scripts -->
        <script src="//cdn.syncfusion.com/ej2/21.1.35/ej2-base/dist/global/ej2-base.min.js" type="text/javascript"></script>
        <script src="//cdn.syncfusion.com/ej2/21.1.35/ej2-data/dist/global/ej2-data.min.js" type="text/javascript"></script>
        <script src="//cdn.syncfusion.com/ej2/21.1.35/ej2-inputs/dist/global/ej2-inputs.min.js" type="text/javascript"></script>
        <script src="//cdn.syncfusion.com/ej2/21.1.35/ej2-buttons/dist/global/ej2-buttons.min.js" type="text/javascript"></script>
        <script src="//cdn.syncfusion.com/ej2/21.1.35/ej2-lists/dist/global/ej2-lists.min.js" type="text/javascript"></script>
        <script src="//cdn.syncfusion.com/ej2/21.1.35/ej2-popups/dist/global/ej2-popups.min.js" type="text/javascript"></script>
        <script src="//cdn.syncfusion.com/ej2/21.1.35/ej2-dropdowns/dist/global/ej2-dropdowns.min.js" type="text/javascript"></script>
   </head>
   <body>
       <!-- Add the HTML <input> element  -->
         <input type="text" tabindex="1" id='ddl' />
        <script>
        let sportsData = ['Badminton', 'Basketball', 'Cricket', 'Football', 'Golf', 'Gymnastics', 'Hockey', 'Rugby', 'Snooker', 'Tennis'];
        // initialize DropDownList component
        var listObj = new ej.dropdowns.DropDownList({
            //set the data to dataSource property
              dataSource: sportsData,
              //set width to suggestion list
              popupWidth: '250px',
              // set the popup list height
              popupHeight: "250px",
              // set placeholder to DropDownList input element
          placeholder: "Find a game"});
          listObj.appendTo('#ddl');
        </script>
   </body>
  </html>

See Also

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