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.NET 2.0 C# VS make dropdownlist visible/invisible via radio button control (client side)

I have a radiobuttonlist with 2 choices, "car" or "truck".

If "car" is selected, I want 2 different dropdownlists (dd1 and dd2) to appear!

However if " truck" is selected, I want dropdownlist (dd3) to appear and dd1 and dd2 to disappear.

The opposite is true if "car" is selected, dd3 will disappear and dd1 and dd2 will appear again.

When the web page first appears, dd1, dd2 and dd3 dropdownlists are all invisible and radiobuttonlist is not selected ?

Need something simple.

Thanks for help here.

SOLUTION

whityum

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whityum

also have visible = false in the tag on the aspx page.

ASKER CERTIFIED SOLUTION

mrichmon

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whityum

he will have to get the client IDs of the drop downs if he does it that way.

RSSIAdmin

ASKER

mrichmon ---

Thanks so much for the input. (both look good!) The Javascript would save round trips

Does above show all the code I will need to get this to work. For example do I need some kind of pointer or reference to rb1[0] and rb2 etc. like form.document.rb1.. etc ? what is style?

function updateDDLs()
{
if(rbl[0].checked)
{
dd1.style= "";
dd2.style= "";
dd3.style= "display:none;";
}

Help, Tom

whityum

.Net assigns an ID you can access via the ClientID property, e.g. rbl.ClientID.ToString()

you would have to build the javascript string dynamically, like
string s = "if(document.form[0]." + rbl.ClientID.ToString() + ".checked == true){";
s += "{";
s += "document.form[0]." + dd1.ClientID.ToString() + ".style = 'display: inline';"
....

and register the script to the page

mrichmon

Yes.

It would be

document.getElementById("rbl")[0].checked
for the radio button.

Basically you use document.getElementById("ID of control")

This works for the ID you assign from the asp page as long as it is not repeated in a repeater.

RSSIAdmin

ASKER

Thanks so much for the answer to my questions.

Tom