2 dropdownlists

Bart Schelkens · Aug 9, 2004

Hi,

I have a webpage that contains 2 dropdownlists.

One is displaying Categories and the other is displaying sub-categories.
When I click on a categorie in the first dropdownlist, I want the second
list to display
the sub-categories for the selected category.

I tried it using the SelectedIndexChanged but this doesn't fire until a
submit of the page. Is there a way to have the desired effect whitout having
to perform a submit ?

Thanks.

Steve Willcock · Aug 9, 2004

Set the AutoPostBack property of the Categories drop down list to true

Mark Rae · Aug 9, 2004

The said:
Is there a way to have the desired effect whitout having to perform a

submit ?

And you replied:

Set the AutoPostBack property of the Categories drop down list to true

Mark Rae · Aug 9, 2004

Is there a way to have the desired effect whitout having to perform a

submit ?

Yes, but I'm going to get flamed for suggesting it

But before I do, you must have a REALLY good reason for not performing a
submit, because that is by far the best way to achieve what you want.

However, if you really don't want to submit, and the datasets in question
are relatively small, you could create a JavaScript client-side array in the
<HEAD> of your page which contains all of the records in the related combo.
Then, when the user selects a different option in the first combo, you call
a client-side JavaScript function which clears the options from the second
combo and repopulates it with only thos options which relate to the
selection in the first combo.

This is not a good idea for several reasons:

1) The array is likely to be large, which will slow the initial load of your
page.

2) If a new option is added to the database, it will not be picked up until
the page actually is refreshed.

Don't do it unless there is a compelling reason to do so...

Bart Schelkens · Aug 10, 2004

Thx,

the autopostback was just what i needed.

Steve Willcock said:
Set the AutoPostBack property of the Categories drop down list to true

Mark Rae · Aug 10, 2004

the autopostback was just what i needed.

So why did your OP ask:

Is there a way to have the desired effect whitout having to perform a

submit ?

???

Bart Schelkens · Aug 11, 2004

Mark,

the problem was that it only worked when i pushed a submit-button.
And at some point during the refresh I lost the data that was in the
dropdownlists.

With the AutoPostBack it doesn't have that effect.

Maybe I wasn't clear in my question. If so, sorry for that.

Mark Rae · Aug 11, 2004

the problem was that it only worked when i pushed a submit-button.
And at some point during the refresh I lost the data that was in the
dropdownlists.

With the AutoPostBack it doesn't have that effect.

Maybe I wasn't clear in my question. If so, sorry for that.

That's no problem.

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2 dropdownlists

Bart Schelkens

Steve Willcock

Mark Rae

Mark Rae

Bart Schelkens

Mark Rae

Bart Schelkens

Mark Rae

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