File Upload Validation

File Upload Validation

Hi,
How to validate for file input type and i tried below code 

var validator = $("#parse").validate({
rules: {                
sr1: "required",
    },  
    myfile: {
            required: true,
            accept: "cer|CER|pem|PEM"
        },
   errorElement: "span" ,                              
   messages: {
   
    sr1: " Enter SerialNumber",
    myfile:"File Required"
   
   }
});
if(validator.form()){ // validation perform
//$('form#parse').attr({action: 'mycontroller'});
$('form#parse').submit();
}

but working ,

please help me how to do it 

Thanks in advance