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Get the Total Size of Selected Files in JavaScript (ES5) Uploader control

29 Jul 2021 / 1 minute to read

You can get the total size of selected files before uploading it to the designated server. This can be achieved by using the selected event. Refer to the following example to calculate the total file size.

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index.js
index.html
index.css
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// initialize Uploader component
var uploadObject = new ej.inputs.Uploader({
    asyncSettings: {
        saveUrl: 'https://ej2.syncfusion.com/services/api/uploadbox/Save',
        removeUrl: 'https://ej2.syncfusion.com/services/api/uploadbox/Remove'
    },
    selected: onSelect
});

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

function onSelect(args) {
    var totalSize = 0;
    for (var i=0; i <args.filesData.length; i++) {
        var file = args.filesData[i];
        totalSize = totalSize + file.size;
    }
    var size = uploadObj.bytesToSize(totalSize);
    alert("Total select file's size is " + size);
}
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<!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="//cdn.syncfusion.com/ej2/ej2-base/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-inputs/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-buttons/styles/material.css" rel="stylesheet">
    
    
<script src="https://cdn.syncfusion.com/ej2/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>
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#container {
  visibility: hidden;
  margin: 0 auto;
  width: 300px;
}

#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.