How to check MIME type in EJ2 JavaScript File Upload

08 Sep 20263 minutes to read

By handling the uploading event, you can inspect the file’s MIME type before it is uploaded to the server. The MIME type is available in the event arguments (for example, args.filesData[0].type). To reject a file based on its MIME type, set args.cancel to true within the uploading event handler. In the following sample, the file’s MIME type is displayed in an alert box before the file is uploaded.

ej.base.enableRipple(true);

//Initialize the control by preload files
var uploadObj = new ej.inputs.Uploader({
    autoUpload: false,
    asyncSettings: {
        saveUrl: 'https://services.syncfusion.com/js/production/api/FileUploader/Save',
        removeUrl: 'https://services.syncfusion.com/js/production/api/FileUploader/Remove'
    },
    uploading: onBeforeUpload
});
uploadObj.appendTo('#fileupload');

function onBeforeUpload(args) {
    // get the file MIME type
    alert("File MIME type is: " + args.fileData.rawFile.type)
}
<!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/ej2/34.2.2/ej2-base/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/34.2.2/ej2-inputs/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/34.2.2/ej2-popups/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/34.2.2/ej2-buttons/styles/material.css" rel="stylesheet">
    
    
<script src="https://cdn.syncfusion.com/ej2/34.2.2/dist/ej2.min.js" type="text/javascript"></script>
</head>
<body>
    
        <div id="container">
            <input type="file" id="fileupload" name="UploadFiles">
        </div>
    

<script>
var ele = document.getElementById('container');
if(ele) {
  ele.style.visibility = "visible";
}   
      </script>
<script src="index.js" type="text/javascript"></script>
</body></html>
#container {
  visibility: hidden;
}

#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 JavaScript File Upload feature tour page for its groundbreaking features. You can also explore our JavaScript File Upload example to understand how to browse the files which you want to upload to the server.