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Fileupload control with image preview Asp.net

Demo and code for how to preview image before upload in Asp.net using jQuery

by Athil

Posted on 04 Apr 2020 Category: Asp.net Views: 1480

Here Iam going to show how to preview image befroe upload in asp.net using jQuery

for this we need to link jQuery library in our page.



  <script src="js/jquery.min.js"></script>

Add one file upload and image control.

<asp:FileUpload ID="ImgUpload" accept="image/x-png,image/gif,image/jpeg"  onchange ="readURL(this);" runat="server" /> <br/>
<asp:Image ID="imgPrev" runat="server" ImageUrl ="https://examples.unclecoder.com/images/no-image-found-360x250.png"   style="width:200px;height:auto;" />

In the above code I give file upload control with id ImgUpload  that will accept png/gif/jpeg files. If need more types we can add in accept attribute.

And one image control aslo added with id imgPrev  for preview images and the with I mentioned 200px in style and heht will be automatically adjust accroding to the size of image.


Add the bellow jQuery script to get the preview.

function readURL(input) 
 if (input.files && input.files[0])
   var reader = new FileReader();
   reader.onload = function (e) 
     $('#<%= imgPrev.ClientID%>')
     .attr('src', e.target.result);


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