JavaScript (ES5)
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Sort the Selected Files in JavaScript (ES5) Uploader control

You can sort the selected files in uploader component by using the selected event. Refer to the following example.

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index.js
index.html
index.css
// 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
});

uploadObject.appendTo('#fileupload');

function onSelect(args) {    
    if (initial) { initial = false; return; }
    args.isModified = true;
    var oldFiles = uploadObj.getFilesData();
    var filesData = args.filesData.concat(oldFiles);
    var modifiedData = sortFileList(filesData);
    args.modifiedFilesData = modifiedData;
}

function sortFileList(filesData) {
    var files = filesData;
    var fileNames = [];
    for (var i = 0; i < files.length; i++) {
        fileNames.push(files[i].name);
    }
    var sortedFileNames = fileNames.sort();
    var sortedFilesData = [];
    var index = 0;
    for (var i = 0; i < sortedFileNames.length; i++) {
        var name = sortedFileNames[i];
        for (let i = 0; i < files.length; i++) {
            if (name === files[i].name) {
                sortedFilesData.push(files[i]);
            }
        }
    }
    return sortedFilesData;
}
<!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>
#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%;
}
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