Form Validation - Object not always displayed on page

neilr · Joined: 29 Apr 2007 Posts: 1

I have an ASP web page which is used to logon to a database, when you are not logged on the web page only displays the Username and Password text boxes. Once logged on neither of these text boxes are displayed. I want the Username text box to recieve focus when the page loads which I can do but after you logon my function still tries to give the Username text box focus even though it does not exist which results in the following error -

Error: 'document.logon.username' is null or not an object
Code: 0

Any help would be greatly appreciated.

Many thanks

neilr

mwa103 · 100+ Club Joined: 07 Mar 2005 Posts: 206

The sloppy way to do it, in my opinion, would be to create an input box named username and make it hidden (input type='hidden') on a successful login. Not sure if you would get an error trying to give focus to a hidden element or not though. The better way to do it would be to code the program so that the focus is skipped somehow, but I have no idea how to tell you to do that. Maybe you could check to see if the object exists before giving it focus? (something like if(document.logon.username != null)) Hope this helps.

-Mike