gelElemetsByClassName question

[phppup]

I have used an assortment of document.getElementBy.... to retrieve data

If (document.getElementById('xyz').value >10) { do this... or that.. etc.

I have a group of items with radio buttons and will assign a function if the element ID is A, perhaps a different function if the ID is B, or C etc.

Now I want to assign an element by its CLASS.  How can I incorporate the desire that if the element's CLASS is "bluebackground" then alert("This is of blue background class")

I had tried

if(document.getElementsByClassName("bluebackground") == true) {
alert("message of choice");
}

And other variations, but something is not connecting.

[requinix]

You know that getElementsByClassName is for searching the page for elements with that class name, right? It's useless for telling you the class of a particular element.

Take the .className of your element, .split() on space, then use .indexOf() to search the array for your class name. It will return a number >=0 if it's in there.

[phppup]

Something else I learned now.

I had a hunch, but i thought it was worth a try to see if I could use CLASS in similar fashion to getElementById.  It seems the short answer is NO.

Thanks.

[requinix]

You can, it's just that the way you'd use them won't help you with this problem.

[phppup]

Already worked around the issue with a simpler and more effective solution.

Just wanted to see if I could pull off something fancy.

More trouble than it was worth, but a good learning experience.

Thanks again.