Add Image Previews before Uploading Files in the Upload
Environment
| Product | Progress® Kendo UI® Upload for jQuery |
| Operating System | Windows 10 64bit |
| Visual Studio Version | Visual Studio 2017 |
| Preferred Language | JavaScript |
Description
How can I add an image preview for the user before the file is uploaded in the Kendo UI Upload?
Solution
The following example demonstrates how to add an image preview and read the file in the select event of the Upload.
<div id="example">
<h3>Add image preview before uploading file</h3>
<input type="file" id="files">
<script>
$(document).ready(function() {
$("#files").kendoUpload({
async: {
saveUrl: "save",
removeUrl: "remove",
autoUpload: false
},
multiple: false,
select: function(e) {
var fileInfo = e.files[0];
var wrapper = this.wrapper;
setTimeout(function(){
addPreview(fileInfo, wrapper);
});
}
});
});
function addPreview(file, wrapper) {
var raw = file.rawFile;
var reader = new FileReader();
if (raw) {
reader.onloadend = function () {
var preview = $("<img class='image-preview'>").attr("src", this.result);
wrapper.find(".k-file[data-uid='" + file.uid + "'] .k-file-group-wrapper")
.replaceWith(preview);
};
reader.readAsDataURL(raw);
}
}
</script>
<style>
.image-preview {
position: relative;
vertical-align: top;
height: 45px;
}
</style>
</div>