Question

I have a for loop inside which I check to see if the current element being iterated has any a tags or form tags inside of it and if so I do some stuff to them. Anyway I can check either or like so:

var form_or_a_tag = elem[i].getElementsByTagName('a');
var form_or_a_tag = elem[i].getElementsByTagName('form');

But how can I combine them?

these all fail:

var form_or_a_tag = elem[i].getElementsByTagName('a form');
var form_or_a_tag = elem[i].getElementsByTagName('a, form');
var form_or_a_tag = elem[i].getElementsByTagName('a') || elem[i].getElementsByTagName('form');

Basically I would like to store in the variable form_or_a_tag all form or a tags that reside in the element currently being iterated.

Answer 1

This might work:

var nodelist_a    = elem[i].getElementsByTagName('a');         // NodeList
var nodelist_form = elem[i].getElementsByTagName('form');      // NodeList

var array_a       = Array.prototype.slice.call(nodelist_a);    // Array
var array_form    = Array.prototype.slice.call(nodelist_form); // Array

var array_both    = array_a.concat(array_form);                // Array

Note that the result is no longer a NodeList but an Array; however each item is a Node.