phoneField_5.js

/*******************************************************
  * setupPhoneFields
  * Now let's rig up all the fields with the specified
  * 'className' to work like phone number input fields
*******************************************************/
function setupPhoneFields(className){
  var lstPhoneFields = document.getElementsByClassName(className);
  
  for(var i=0; i < lstPhoneFields.length; i++){
    var input = lstPhoneFields[i];
    if(input.type.toLowerCase() == "text"){
      input.placeholder = "Enter a phone (XXX-XXX-XXXX)";
      input.addEventListener("keydown", onKeyDown);
      input.addEventListener("keyup", onKeyUp);
    }
  }
}

//MAIN
setupPhoneFields("phoneNumber");