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Onload focus with id generated an error if id not found.Workaround?

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celia05es

celia05es

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Jan 10, 2002
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Hello,
Well, I have a jsp file and the body line is:
Code: 
<body onload="if (document.getElementById) document.getElementById('L1').focus();">
Now, if the file, I build a table. THere are several possible cases:
- Tuples can be deleted
- Tuples can be modified
- Tuples can be added
- Tuples can only be viewed.
In case tuples can me modified or deleted, I put the focus on the first tuples.

In case tuples can only be added, I put the focus on the tuples to be added.
Code: 
<input type=text name=<%=name%> id="L1" tabindex=...>

My problem is that if a table can only be viewed, there is no "id"... I have tried to put the id="L1" on a hidden field but it does not work.
When IE loads the page, I get a "page error".... which is normal since there is no label "L1" defined....

Is there a workaround for that?

THanks for your help
 
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There are many ways around it. Here are 2:

Code: 
onload="try { document.getElementById('L1').focus(); }; catch(e) {};"

Code: 
onload="if (document.getElementById) if (document.getElementById('L1')) document.getElementById('L1').focus();"

And I've got to ask... what is a tuple?

Dan

[tt]Dan's Page [blue]@[/blue] Code Couch
[/tt]
 
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I thought a Tuple was a baby Oompa-Loompa. Or was it a BUNCH of baby Oomp-Loompa's?

Stamp out, eliminate and abolish redundancy!
 
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THank you so much !!

Well, I was thinking database when I wrote this.... so, in a relational database, a tuple is a record (a row)
 
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OK, the same type of question.... after the <table> definition, I have:
Code: 
<script language="javaScript">document.getElementById('L1').focus();</script>
How can I write it so it does not generate an error if the L1 does not exist!!!

I am not that good in Javascript as you have noticed!!!

THanks
 
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Well, thinking a little bit, I suppose the lines you have written work anywhere !!! Right?
 
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