I'm using the following script to select the first text input field of the first form, however I can't test for the element without causing an error!

function firstSelect ()
    {
        if (document.forms[0].getElementsByTagName ('input'))
            {
                var input = document.forms[0].getElementsByTagName ('input');
        
                // get first text input
                for (i = 0; i < input.length; i ++)
                    {
                        if (input[i].type == 'text')
                            {
                                input[i].focus ();
                                break; }
                    }
            }
    }

window.onload = firstSelect;

I assumed that using if (document.forms[0].getElementsByTagName ('input')) would prevent this, but it doesn't seem to?

I think getElementsByTagName always returns an array, even when it found nothing.
And maybe an empty array counts as true, so you should check the length of the array instead?

Hmmm I've tried it with the following:

if (document.forms[0].getElementsByTagName ('input').length > 0)

But still no luck

The error I'm getting is

Error: document.forms[0] is undefined
Source File: http://www.pealo.local/xampp/mattPea...FirstSelect.js
Line: 5

Basically that error tells you, there's no form on the page, but you say there is?
Weird!

Oh no there is no form on the page sorry. I was hoping the script would basically just check to see if there is one, then carry on with the function if it finds a form with an input field in there.

Then you should add another check first, I think.

function firstSelect ()
    {
        if (typeof document.forms[0] != 'undefined')
            {
            if (document.forms[0].getElementsByTagName ('input'))
                {
                    var input = document.forms[0].getElementsByTagName ('input');

                    // get first text input
                    for (i = 0; i < input.length; i ++)
                        {
                            if (input[i].type == 'text')
                                {
                                    input[i].focus ();
                                    break; }
                        }
                }
            }
    }

window.onload = firstSelect;

Success! I wish I'd have thought of that lol.
Thanks for the help.