title: getting image dimensions in extjs fileupload
body: <p>I have a file upload field in my form.I want to get the file dimensions in the front end while uploading before sending to server side.I need to restrict the width and height of the image to 400 x 232 pixels before it is uploaded to the uploads folder.How is it possible to restrict/check the file width and file height purely from the extjs side?</p>