getElementsByClassName onclick issue [duplicate]

Question

I'm using Robert Nyman's script to get all elements with same class in document, but it doesn't work with onclick or any other event:

var photo = document.getElementsByClassName("photo_class","img",document.getElementById("photo_wrap")); 
photo.onclick = function(){alert("Finaly!");

Maybe you know how to fix it? Thanks!

Answer 1

I guess photo is a array. If that's the case, try that:

var photo = document.getElementsByClassName(
    "photo_class","img",document.getElementById("photo_wrap")
);

for (var i=0; i < photo.length; i++) {
    photo[i].onclick = function(){
        alert("Finaly!");
    }
};

Answer 2

Try

photo[0].onclick = function(){alert("Finaly!");};

getElementsByClass returns array