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Sort the selected files

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

Source
Preview
app.ts
index.html
index.css
import {  Uploader, FileInfo, SelectedEventArgs } from '@syncfusion/ej2-inputs';
import { Event } from '@syncfusion/ej2-base';

let initial: boolean = true;

let uploadObj: Uploader = new Uploader({
    asyncSettings: {
        saveUrl: 'https://aspnetmvc.syncfusion.com/services/api/uploadbox/Save',
        removeUrl: 'https://aspnetmvc.syncfusion.com/services/api/uploadbox/Remove'
    },
    selected: onSelect

});
uploadObj.appendTo('#fileupload')

function onSelect(args: SelectedEventArgs): void {
    if (initial) { initial = false; return; }
    args.isModified = true;
    let oldFiles: FileInfo[] = uploadObj.getFilesData();
    let filesData: FileInfo[] = args.filesData.concat(oldFiles);
    let modifiedData: FileInfo[] = sortFileList(filesData);
    args.modifiedFilesData = modifiedData;
}

function sortFileList(filesData: FileInfo[]): FileInfo[] {
    let files: FileInfo[] = filesData;
    let fileNames: string[] = [];
    for (let i: number = 0; i < files.length; i++) {
        fileNames.push(files[i].name);
    }
    let sortedFileNames: string[] = fileNames.sort();
    let sortedFilesData: FileInfo[] = [];
    let index: number = 0;
    for (let name of sortedFileNames) {
        for (let i: number = 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://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
</head>
<body>
    <div id='loader'>Loading....</div>
    <div id='container'>
        <input type="file" id="fileupload" name="UploadFiles"/>
    </div>
</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%;
}