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document.getElementById isn't working

risk32
98
Hi all. I'm not exactly sure what I'm doing wrong, but when I try to use the document.getElementById() method, it's not working. Here's what I have:

Expand|Select|Wrap|Line Numbers
  1. var username = document.getElementById('username')
  2.  
  3. function test()
  4.     {
  5.         document.write(username)
  6.     }
  7.  
  8. ...
  9.  
  10. Username: <input type="text" id="username">
  11. <input type="button" value="test" onClick="test();">
  12.  
(I am aware that I don't use braces in standard format, it just helps me keep track of what I'm doing)

When I click the button, the only thing it returns is null. Am I doing something wrong?
May 27 '10 #1
3 1276
Dormilich
8,651 Expert Mod 8TB
yes and no. if you call getElementById() before the document tree is finished (resp. the element in questions is attached to the DOM) you get null as result.
May 27 '10 #2
risk32
98
@Dormilich
Where would be the appropiate location for the document.getElementById() method?
May 28 '10 #3
risk32
98
I actually feel like an idiot. Even though the variable was assigned globally, it didn't read inside the function. So, I put it inside the function and added .value to the end for the alert. It's working. Now to figure out arrays...
May 28 '10 #4

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