How to check file input size with jQuery?

Question

I have a form with file upload capabilities and I would like to be able to have some nice client side error reporting if the file the user is trying to upload is too big, is

Answer 1

If you want to use jQuery's validate you can by creating this method:

$.validator.addMethod('filesize', function(value, element, param) {
    // param = size (en bytes) 
    // element = element to validate ()
    // value = value of the element (file name)
    return this.optional(element) || (element.files[0].size <= param) 
});

You would use it:

$('#formid').validate({
    rules: { inputimage: { required: true, accept: "png|jpe?g|gif", filesize: 1048576  }},
    messages: { inputimage: "File must be JPG, GIF or PNG, less than 1MB" }
});