How to add a onclick event to an element using javascript

Question

I have created an element using document.getElementsByClassname, and would like to add a onclick event to this element, so that when someone clicks on this element onclick f

Answer 1

Try this:
document.getElementsByClassName always returns array of elements.

 var element= document.getElementsByClassName('classname');
 for(var i=0;i<element.length;i++){
      element[i].addEventListener("click", function(){alert('clicked')}, false);   
 }