jQuery Validate File Upload

Question

I am trying to validate a HTML file upload using jQuery Validate

I found I can use the meta option like:

$(\"#myform\").validate({
   meta: \"validate\"         


        

Answer 1

If you want to use jQuery's validate to check the size of the file, you can do so by doing the following :

1- load the additional methods file

<script src="http://cdn.jsdelivr.net/jquery.validation/1.15.0/additional-methods.min.js"></script>

2- add a custom method to validate the file size

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

3- use the newly added method as a validation rule to validate your input:

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

Note: using the "accept" validation rule instead of "extension" result in MIME type error messages when you upload a file with a blank file type.