You can customize the uploader component using confirm dialog before removing the files. Here, ej2 dialog is used as confirm dialog. Refer to the following example.
// 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'
},
removing: onremove
});
// render initialized Uploader
uploadObject.appendTo('#fileupload');
function onremove(args) {
args.cancel = true;
removeFile.push(args.filesData);
dialog.show();
}
// Initialize Dialog component
var dialog = new ej.popups.Dialog({
content: 'Confirm to remove the file?',
buttons: [{'click': () => { onClick() }, buttonModel: { content: 'OK', cssClass: 'e-flat'}},
{'click': () => {dialog.hide(); }, buttonModel: { content: 'Cancel', cssClass: 'e-flat'} }],
width: '250px',
visible: false,
target: '#container'
});
dialog.appendTo('#dialog');
function onClick() {
dialog.hide();
uploadObj.remove(removeFile, false, true);
removeFile=[];
}
<!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 id="dialog"></div>
</div>
<script>
var ele = document.getElementById('container');
if(ele) {
ele.style.visibility = "visible";
}
</script>
<script src="index.js" type="text/javascript"></script>
</body></html>
html,
body,
#container {
height: 100%;
overflow: hidden;
margin: auto 30px;
padding: 20px 0;
}
#loader {
color: #008cff;
font-family: 'Helvetica Neue','calibiri';
font-size: 14px;
height: 40px;
left: 45%;
position: absolute;
top: 45%;
width: 30%;
}