Dropdownlist - display different record

[olypost]

I have a client-side button that I want to call a
javascript function via onclick.

All I need to do is reset a dropdownlist back to the first
record in the list.

Tried: document.forms['myform'].elements['mydropdownlist'].selectedIndex = 0;

and tried:

document.getElementById("mydropdownlist").selectedIndex = 0

Both cases give me errors at runtime.

What am I missing?

Thanks

 

[tsuji]

>Both cases give me errors at runtime.
>What am I missing?
The error is not coming from the .selectedIndex line.

 

[olypost]

If I remove that line, no errors.

When I enter: document.getElementById("mydropdownlist").
for some reason it doesn't have selectedIndex in the pick list.

I can do:
document.getElementById("mydropdownlist").innertext = "";

without the runtime error, but this isn't what I want.

Don't know why selectedIndex doesn't appear in the list
(innerhtml, innertext, etc are in the list)

 

[tsuji]

What do you get this?
[tt] alert(document.getElementById("mydropdownlist").type)[/tt]

 

[olypost]

select-one

 

[tsuji]

Either you have some inline script before the select-one element is rendered or some iframe or else. Is it an inline script? Do you want the forum to guess riddle?

 

[olypost]

It is all client-side in the .aspx file.

<script lang=Javascript>
function clearfields ()
{
document.getElementById("mydropdownlist").selectedIndex = 0;

}
</script>

I don't want to go to the server to do this. Is this possible?

 

[tsuji]

How is it called? How is the form look like? Of course it is possible. It is read-write property, the selectedIndex. That's about it.

 

[olypost]

I call it in an html button.

..... type=button onclick="clearfields();"....

Then I just call the javascript function. I am confused why I can't even put in the .selectedIndex

 

[tsuji]

use getElementById for id, use getElementsByName with index for name or use formreference.elements[name] to reference the select element, if you test your page on moz. Otherwise, if you do not feel comfortable to pose code here, bring your question to asp.net forum.

http://tek-tips.com/threadminder.cfm?pid=855

The question does not deserve exchanges for more than 7 rounds.

 

[olypost]

I solved it.

document.getElementById("mydropdownlist").value = 0;

Strange-- .value isn't even in the list of choices in Visual Studio

But it works beautifully now. Thanks.