Why does this code NOT execute ?

Alex · Jan 29, 2008

Hello, all.

Big question (for my very limited knowledge) - What's wrong with
this ? No error, but nothing happens:

HTML......................
<head runat="server">
<title>Test Page</title>
<script>
function radioButtonList2Click()
{
document.form1.radioButtonList1.SelectedIndex = -1;
}
</script>
<script>
function radioButtonList1Click()
{
document.form1.radioButtonList2.SelectedIndex = -1;
}
</script>
</head>

and

protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
if (radioButtonList1.Attributes["OnSelectedIndexChanged"] == null)
{
radioButtonList1.Attributes.Add("OnSelectedIndexChanged",
"javascript:radioButtonList1Click()");
}

if (radioButtonList2.Attributes["OnSelectedIndexChanged"] == null)
{
radioButtonList2.Attributes.Add("OnSelectedIndexChanged",
"javascript:radioButtonList2Click()");
}
}
}

Thanks a lot
Alex

VK · Jan 29, 2008

Hello, all.

Big question (for my very limited knowledge) - What's wrong with
this ? No error, but nothing happens:

HTML......................
<head runat="server">
<title>Test Page</title>
<script>
function radioButtonList2Click()
{
document.form1.radioButtonList1.SelectedIndex = -1;
}
</script>
<script>
function radioButtonList1Click()
{
document.form1.radioButtonList2.SelectedIndex = -1;
}
</script>
</head>

and

protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
if (radioButtonList1.Attributes["OnSelectedIndexChanged"] == null)
{
radioButtonList1.Attributes.Add("OnSelectedIndexChanged",
"javascript:radioButtonList1Click()");
}

if (radioButtonList2.Attributes["OnSelectedIndexChanged"] == null)
{
radioButtonList2.Attributes.Add("OnSelectedIndexChanged",
"javascript:radioButtonList2Click()");
}
}
}

Thanks a lot
Alex

What language is that? It is not Javascript for sure. Looks a bit like
Microsoft JScript 7.0/8.0 with non-existing DOM methods. If it's one
of Microsoft ASP jargons, you may ask at
microsoft.public.scripting.jscript
If it is intended to be an universal Javascript code then please
explain the intended behavior and let's start to clean up.

Thomas 'PointedEars' Lahn · Jan 30, 2008

Alex said:
Big question (for my very limited knowledge) - What's wrong with
this ? No error, but nothing happens:

HTML......................
<head runat="server">

This may be one reason why nothing happens. Try removing the `runat'
attribute so that the scripts in the `head' element are executed client-side.

<title>Test Page</title>
http://www.w3.org/QA/Tips/good-titles

<script>

function radioButtonList2Click()
{
document.form1.radioButtonList1.SelectedIndex = -1;

This is probably another reason why nothing happens. Client-side properties
are more often case-sensitive (in ASP, server-side properties more often are
not, for compatibility to VBScript):

... .selectedIndex = -1;

If you use `.SelectedIndex' instead, the control object is added a
user-defined property that is not part of the DOM and therefore not
evaluated by the layout engine.

[...]
function radioButtonList1Click()
{
document.form1.radioButtonList2.SelectedIndex = -1;
}

Same here.

[...]
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
if (radioButtonList1.Attributes["OnSelectedIndexChanged"] == null)
{
radioButtonList1.Attributes.Add("OnSelectedIndexChanged",
"javascript:radioButtonList1Click()");
}

if (radioButtonList2.Attributes["OnSelectedIndexChanged"] == null)
{
radioButtonList2.Attributes.Add("OnSelectedIndexChanged",
"javascript:radioButtonList2Click()");
}
}
}

This is C# or maybe J# code in ASP .NET that generates elements which
have event listeners attached to execute the above JScript code.
`OnSelectedIndexChanged' is a server-side event handler attribute of
Microsoft Web Controls.

http://msdn2.microsoft.com/en-us/library/system.web.ui.page(VS.80).aspx

Probably `javascript:' should be omitted here, see the FAQ.

HTH

PointedEars

Joost Diepenmaat · Jan 30, 2008

Randy Webb said:
Thomas 'PointedEars' Lahn said the following on 1/30/2008 3:47 PM:

Even you should know that if that made it to the client, then the
client ignores any attribute it doesn't understand and runat is not a
valid attribute for the head element so it gets ignored. Has nothing
to do with whether code gets executed on the client or not.

except that runat="server" is a server directive (for MS ISS I think),
which means that it could possibly prevent the code to reach the client.

I'm not sure what that code is supposed to do or even if it's
supposed to be JavaScript, though.

Joost.

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Why does this code NOT execute ?

Alex

VK

Thomas 'PointedEars' Lahn

Joost Diepenmaat

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