Getting started in EJ2 TypeScript Uploader control

3 Nov 202316 minutes to read

This section explains how to create a simple Uploader component and configure its available functionalities in TypeScript, using Essential JS 2 quickstart seed repository.

This application is integrated with the webpack.config.js configuration and uses the latest version of the webpack-cli. It requires node v14.15.0 or higher. For more information about webpack and its features, refer to the webpack documentation.

Dependencies

The following are the dependencies required to use the uploader component in your application:

|-- @syncfusion/ej2-inputs
    |-- @syncfusion/ej2-base
    |-- @syncfusion/ej2-buttons

Set up development environment

Open the command prompt from the required directory, and run the following command to clone the Syncfusion JavaScript (Essential JS 2) quickstart project from GitHub.

git clone https://github.com/SyncfusionExamples/ej2-quickstart-webpack- ej2-quickstart

After cloning the application in the ej2-quickstart folder, run the following command line to navigate to the ej2-quickstart folder.

cd ej2-quickstart

Add Syncfusion JavaScript packages

Syncfusion JavaScript (Essential JS 2) packages are available on the npmjs.com public registry. You can install all Syncfusion JavaScript (Essential JS 2) controls in a single @syncfusion/ej2 package or individual packages for each control.

The quickstart application is preconfigured with the dependent @syncfusion/ej2 package in the ~/package.json file. Use the following command to install the dependent npm packages from the command prompt.

npm install

Import the Syncfusion CSS styles

To render Uploader component, need to import inputs and its dependent components styles as given below in the ~/src/styles/styles.css file, as shown below:

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

Initialize the uploader

The uploader can be initialized through input tag. Add the HTML input element that needs to be initialized as a uploader in index.html.

[src/index.html]

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

<head>
    <title>Essential JS 2 Uploader component</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 href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet" />
</head>

<body>
    <div id='container' style="margin:0 auto; width:300px;">
        <!--element which is going to render the Uploader-->
        <input type="file" id='fileupload' />
    </div>

</body>

</html>

The Custom Resource Generator (CRG) is an online web tool, which can be used to generate the custom script and styles for a set of specific components.
This web tool is useful to combine the required component scripts and styles in a single file.

Now, import the uploader component to your app.ts and initialize it to the element #fileupload as follows.

[src/app/app.ts]

import { Uploader } from '@syncfusion/ej2-inputs';

// initialize Uploader component
let uploadObject: Uploader = new Uploader();

// render initialized Uploader
uploadObject.appendTo('#fileupload');

Run the application

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

npm run start

From v16.2.41 version, the Essential JS2 AJAX library has been integrated for uploader server requests. Hence, use the third party promise library like blue-bird to use the uploader in Internet Explorer.

The following example illustrates the output in your browser.

import { Uploader } from '@syncfusion/ej2-inputs';

// initialize Uploader component
let uploadObject: Uploader = new Uploader({
    // disable the auto upload functionalities
    autoUpload: false
});

// render initialized Uploader
uploadObject.appendTo('#fileupload');
<!DOCTYPE html>
<html lang="en">

<head>
    <title>Essential JS 2 UPloader</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Essential JS 2 Uploader Component" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
    <link href="https://cdn.syncfusion.com/ej2/24.2.3/ej2-base/styles/material.css" rel="stylesheet" />
    <link href="https://cdn.syncfusion.com/ej2/24.2.3/ej2-inputs/styles/material.css" rel="stylesheet" />
    <link href="https://cdn.syncfusion.com/ej2/24.2.3/ej2-popups/styles/material.css" rel="stylesheet" />
    <link href="https://cdn.syncfusion.com/ej2/24.2.3/ej2-buttons/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>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>
<body>
    <div id='loader'>Loading....</div>
        <div id='container' class="fileupload">
            <input type="file" id="fileupload" name="UploadFiles"/>
        </div>
    </div>
</body>
</html>
#container {
  visibility: hidden;  
  margin: 0 auto;
  width: 400px;
}

#loader {
  color: #008cff;
  font-family: 'Helvetica Neue','calibiri';
  font-size: 14px;
  height: 40px;
  left: 45%;
  position: absolute;
  top: 45%;
  width: 30%;
}

Adding drop area

By default, the uploader component allows to upload files by drag the files from file explorer, and drop into the drop area. You can configure any other external element as drop target using dropArea property.

In the following sample, drop target is configured.

import { Uploader } from '@syncfusion/ej2-inputs';

// initialize Uploader component
let uploadObject: Uploader = new Uploader({
    autoUpload: false,
    dropArea: document.getElementById('droparea')
});

// render initialized Uploader
uploadObject.appendTo('#fileupload');
<!DOCTYPE html>
<html lang="en">

<head>
    <title>Essential JS 2 Uploader</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Essential JS 2 Uploader Component" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
    <link href="https://cdn.syncfusion.com/ej2/24.2.3/ej2-base/styles/material.css" rel="stylesheet" />
    <link href="https://cdn.syncfusion.com/ej2/24.2.3/ej2-inputs/styles/material.css" rel="stylesheet" />
    <link href="https://cdn.syncfusion.com/ej2/24.2.3/ej2-popups/styles/material.css" rel="stylesheet" />
    <link href="https://cdn.syncfusion.com/ej2/24.2.3/ej2-buttons/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>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>
<body>
    <div id='loader'>Loading....</div>
    <div id='container' style='width: 90%'>
        <div id='droparea'  >
            Drop files here to upload
        </div>
        <div id='uploadfile' >
            <input type="file" id="fileupload" name="UploadFiles"/>
        </div>
    </div>
</body>
</html>
#container {
  visibility: hidden;
  padding-left: 5%;
  width: 100%;
}
#loader {
  color: #008cff;
  font-family: 'Helvetica Neue','calibiri';
  font-size: 14px;
  height: 40px;
  left: 45%;
  position: absolute;
  top: 45%;
  width: 30%;
}
.fileupload {
  margin: 20px auto;
  width: 400px;
}
#droparea {
  padding: 50px 25px;
  margin: 30px auto;
  border: 1px solid #c3c3c3;
  text-align: center;
  width: 20%;
  display: inline-flex;
}
.e-file-select,
.e-file-drop {
  display: none;
}
body .e-upload-drag-hover {
  outline: 2px dashed brown;
}
#uploadfile {  
  width: 60%;
  display: inline-flex;
  margin-left: 5%;
}

Configure asynchronous settings

The uploader component process the files to upload in Asynchronous mode by default. Define the properties saveUrl and removeUrl to handle the save and remove action as follows.

import { Uploader } from '@syncfusion/ej2-inputs';

// initialize Uploader component
let uploadObject: Uploader = new Uploader({
    asyncSettings: {
        saveUrl: 'https://ej2.syncfusion.com/services/api/uploadbox/Save',
        removeUrl: 'https://ej2.syncfusion.com/services/api/uploadbox/Remove'
    }
});

// render initialized Uploader
uploadObject.appendTo('#fileupload');
<!DOCTYPE html>
<html lang="en">

<head>
    <title>Essential JS 2 Uploader</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Essential JS 2 Uploader Component" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
    <link href="https://cdn.syncfusion.com/ej2/24.2.3/ej2-base/styles/material.css" rel="stylesheet" />
    <link href="https://cdn.syncfusion.com/ej2/24.2.3/ej2-inputs/styles/material.css" rel="stylesheet" />
    <link href="https://cdn.syncfusion.com/ej2/24.2.3/ej2-popups/styles/material.css" rel="stylesheet" />
    <link href="https://cdn.syncfusion.com/ej2/24.2.3/ej2-buttons/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>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>
<body>
    <div id='loader'>Loading....</div>
        <div id='container'>
            <input type="file" id="fileupload" name="UploadFiles"/>
        </div>
    </div>
</body>
</html>
#container {
  visibility: hidden;
  margin: 0 auto;
  width: 400px;
}

#loader {
  color: #008cff;
  font-family: 'Helvetica Neue','calibiri';
  font-size: 14px;
  height: 40px;
  left: 45%;
  position: absolute;
  top: 45%;
  width: 30%;
}

Handle success and failed upload

You can handle the success and failure actions using the success and failure  events. To handle these event, define the function and assign it to corresponding event as follows.

import { Uploader } from '@syncfusion/ej2-inputs';

// initialize Uploader component
let uploadObject: Uploader = new Uploader({
    asyncSettings: {
        saveUrl: 'https://ej2.syncfusion.com/services/api/uploadbox/Save',
        removeUrl: 'https://ej2.syncfusion.com/services/api/uploadbox/Remove'
    },
    success: onUploadSuccess,
    failure: onUploadFailure
});
// render initialized Uploader
uploadObject.appendTo('#fileupload');

function onUploadSuccess(args: any): void  {
  if (args.operation === 'upload') {
    console.log('File uploaded successfully');
  }
}
function onUploadFailure(args: any): void  {
  console.log('File failed to upload');
}
<!DOCTYPE html>
<html lang="en">

<head>
    <title>Essential JS 2 Uploader</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Essential JS 2 Uploader Component" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
    <link href="https://cdn.syncfusion.com/ej2/24.2.3/ej2-base/styles/material.css" rel="stylesheet" />
    <link href="https://cdn.syncfusion.com/ej2/24.2.3/ej2-inputs/styles/material.css" rel="stylesheet" />
    <link href="https://cdn.syncfusion.com/ej2/24.2.3/ej2-popups/styles/material.css" rel="stylesheet" />
    <link href="https://cdn.syncfusion.com/ej2/24.2.3/ej2-buttons/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>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>
<body>
    <div id='loader'>Loading....</div>
        <div id='container'>
            <input type="file" id="fileupload" name="UploadFiles"/>
        </div>
    </div>
</body>
</html>
#container {
  visibility: hidden;
  margin: 0 auto;
  width: 400px;
}

#loader {
  color: #008cff;
  font-family: 'Helvetica Neue','calibiri';
  font-size: 14px;
  height: 40px;
  left: 45%;
  position: absolute;
  top: 45%;
  width: 30%;
}

You can also explore TypeScript File Upload feature tour page for its groundbreaking features. You can also explore our TypeScript File Upload example that shows how to render the file upload and browse the files which you want to upload to the server.

See Also