Store first touch utm in cookie and input into hidden field (Cookie.js, JQuery)

firstTouchUTMCookie.js

// Initiate JQUERY
// Initiate cookie.js : https://github.com/js-cookie/js-cookie
// Parse the URL
function getParameterByName(name) {
    name = name.replace(/[\[]/, "\\[").replace(/[\]]/, "\\]");
    var regex = new RegExp("[\\?&]" + name + "=([^&#]*)"),
        results = regex.exec(location.search);
    return results === null ? "" : decodeURIComponent(results[1].replace(/\+/g, " "));
}
// Give the URL parameters variable names
var source = getParameterByName('utm_source');
var medium = getParameterByName('utm_medium');
var campaign = getParameterByName('utm_campaign');
var content = getParameterByName('utm_content');
var term = getParameterByName('utm_term');
// Set utm function: assumes all hidden fields follow this format : <input name="utm_term" type="hidden">
var set_utm = function setutm(utm_param, utm_val){
  if (Cookies.get(utm_param+'y') != undefined) {
    $('input[name="utm_'+utm_param+'"]').val('');
    //console.log('Reset code for cookie time');
    $('input[name="utm_'+utm_param+'"]').val(Cookies.get(utm_param+'y'));
    //console.log('Set input to ' + Cookies.get(utm_param+'y'));
  } else {
    //console.log('Using current code / no code set');
    if (utm_val != "" ) {
      //console.log('Set the cookie');
      Cookies.set(utm_param+'y', utm_val, {path: '/'});
    };
  }; 
}
// Do the function for each UTM
set_utm('source', source);
set_utm('medium', medium);
set_utm('campaign', campaign);
set_utm('content', content);
set_utm('term', term);