I have a form with a table that I need to ensure does not contain duplicate values.  The first field in the table is a drop down field.  I use the following script to ensure that the drop down values selected are not duplicated and it works great.

The second field is a file upload field.  I need to ensure that the file names aren't duplicated.  How can I modify this script to collect the file names and determine if there are duplicates.

Thanks!

$( document ).ready(function() {
 //*** BEGIN script to validate drop down field
// assign validator to initial rows
assignValidator();
// re-validate when a row is added or removed
  $('.myTable').on('click','.cf-table-add-row, .cf-table-delete',function(){
//alert('assignValidator when table row added')
    assignValidator();
  });
});

function assignValidator(){
  // add unique validator
  $('.myTable .myField select').attr('data-parsley-uniqueselection','');

  // trigger validation on all rows when a row changes
  $('.myTable .myField select').off('change',validateSelection).on('change',validateSelection);
}

function validateSelection(){
  // revalidate the column if the value is not empty

  $('.myTable .myField').each(function(e){
      if($(this).val() != ''){
        $(this).parsley().validate();
      }
  });
}
window.Parsley.addValidator('uniqueselection', {

validateString: function(value, requirement, field) {
// return a list of all column values
    var valueList = field.$element.closest('.cf-table').find('.myField select').map(
      function() {return $(this).val().trim(); }).get();

    // return the result of a filter for more than 1 match for the current field value
    return _.filter(valueList, function(v) { return v == value }).length == 1;
  },

  messages: {

    en: 'Duplicate selection.',

  }
  //*** End script to validate drop down field
//end document ready function  
});