Question

I have a script that I’m running and I want to it to select all the ID’s or Class’s instead of just the first one.

<script type = "text/Javascript" >
    function color(){
        var d=document.getElementsByClassName("black")[0];
        d.setAttribute("style", "background-color:#333;");
    }
</script>

Answer 1

1. The [0] in document.getElementsByClassName("black")[0] means that you’re actually discarding all but the first, after selecting them. Use a loop if you want to iterate over the value returned by gEBCN.
2. Use document.getElementsByTagName('*') if you want all elements.

---

function color() {
    var allElements = document.getElementsByTagName('*');
    for (var i=0; i<allElements.length; i++) {
        allElements[i].setAttribute('style', 'background-color:#333;');
    }
}