how to get element id from custom required function when using jquery.validate

Question

I am using jquery.validate to check my form for errors and I am trying to get the id of the element that has raised an error.

Here is my basic working code, hopefully it should be clear from this what I am after:

function customError(){
    alert("this is where I want the element ID");
}


function submitForm($form){
    $form.validate({
       required: customError(),
       errorPlacement: function(error, element) {},
       submitHandler: function(){
           alert("submited");
       }
    });
}

Answer 1

   ... 
   errorPlacement: function (error, element) {
      customError(element.attr('id'));
    },
   ...