Invision Power Services > Javascript Question

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Phil Mossop

Apr 20 2006, 04:48 PM

I'm linking to a JS script in the <head> part of my page. How can I get the value of a text input on this page? If I include the JS in full in the heqader section rather than linking I can use document.name.field.value but if I link it doesn't seem to like that.

IAIHMB

Apr 20 2006, 04:58 PM

If I understand what you're saying, you've got to let the page load first. Simon Willison's addLoadEvent() is an option, as is the following if you're only executing one function on page load:

CODE

window.onload = function();

"window" could be replaced with "document" if it amuses you, as far as I know there is no difference.

Edit: Maybe this is what you're after. You've got to get ahold of the input, there are a number of ways of doing this. If it's got an id:

CODE

document.getElementById("...").firstChild.nodeValue;
document.getElementById("...").value;

You could also use getElementsByName:

CODE

document.getElementsByName("...")[0].firstChild.nodeValue;
document.getElementsByName("...")[0].value;

Phil Mossop

Apr 20 2006, 05:10 PM

Edit: Nevermind I fixed it. Forgot to put the name attribute on my form tag. Doh!

Thanks anyway!

Hmm, what I mean is, if I include a script like this:

CODE

document.whatever doesn't seem to work, I get this error:

CODE

message: Statement on line 9: Could not convert undefined or null to object
Backtrace:
  Line 9 of linked script http://localhost/ucas/jscripts/unis_step1.js
    send = document.uni.grades.value;
  Line 1 of  script
    fetch_convert("grades");
  At unknown location
    [statement source code not available]

I think that is the problem anyway, not really sure!

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