Question

I have no idea on how to do this so here it goes. What I need is to be able to just validate for empty fields the with no display none;. I am using prototype.

new.onclick = function() {
if (document.getElementById("ticket").style.display !== "none" &&
    document.getElementsByTagName("input").length === 0) {
          alert('need to have something here');      
    }
     alert('need here');      
  };

Answer 1

i think you need to use your if statement this way:

if (document.getElementById("ticket").style.display !== "none" || document.getElementsByTagName("input").length === 0)

so it will be true if no input is added to the DOM or ticket is display: none

anyway if you dont have an Element with ID ticket, your script will be abortet

if(document.getElementById("ticket") != null) {
...
}