Question with Attributes.Add?

g_r_a_robinson · February 13, 2004

Hi

I downloaded a 'Dual Select ListBox Control' from the microsoft asp.net component gallery. Great control!!

I have one problem.

Basically all I need to do is cause a button to become disabled when an item in the 'Dual Select ListBox Control' is selected. It works fine for my other controls including another js control. Heres what I do:

DualSelectListBox1.Attributes.Add( "onclick" , "document.getElementById('JobAdder1_Add_Notes_Normal_BTN').disabled=true;document.getElementById('JobAdder1_UpdateJob_BTN').disabled=false;");

I tried contacting the guy who created the control but I don't know if he's still involved with it.

I figured their must some other way to activate this control.

I went back to scratch and did the following:

put the following between <script> tags

function doJScript()

{

alert("My Own JavaScript Alert Box!")

}

then i tested it using another of my controls, in this case a timepicker:

TimePicker1.Attributes.Add( "onclick" , " doJScript();");

Worked fine.

But when I do the same with my duallist control

DualSelectListBox1.Attributes.Add( "onclick" , " doJScript();");

nothing happens..

This is so important for me and there must be some workaround, any suggestions would be appreciated!!

fadi · February 13, 2004

u should not put onclick event for the drop down, u should use instead onchange

WebJumper · February 13, 2004

and mayve the attributes collection of the costumcontrol is not supported, maybe a programming error.

look at the generated source code of your browser ans search for your added js-events...

g_r_a_robinson · February 13, 2004

It might be a programming error. I can see the attributes method by intellisense but youre right in that it might not be working. If thats the case is there absolutely any other way that i can cause any click or action to activate or disable another button.

WebJumper · February 13, 2004

you can add events on the clientside!!

javascript function that is called:

function jsTestFunction()
{
   if (true)
   {
alert("true");
return true;
   }
   else
   {
alert("false");
return false;
   }
}

javascript add event to listbox:

document.all["DualSelectListBox1"].attachEvent("onchange", jsTestFunction) //note: funtionname without ()

the events you want to attach can be created at "code-behind"!

e.g.

string js = "<script language='javascript'>document.all['DualSelectListBox1'].attachEvent('onchange', jsTestFunction)</script>";

Page.RegisterStartupScript(Guid.NewGuid().ToString(), js);

Regards, Stefan

g_r_a_robinson · February 13, 2004

question about javascript and asp.net checkbox

I have to use some javascript to cause a checkbox when checked to cause another checkbox that is disabled to become enabled.

In other words

checkbox a

checkbox b (disabled)

when checkbox a is checked, b becomes enabled.

I tried this but it doesn't work, but i think its because its not an onclick thing with the checkbox control but i don't know what it is. Any suggestions would be well appreciated.

CheckboxA.Attributes.Add( "onclick" , "document.getElementById('JobAdder1_CheckboxB).disabled=true");

WebJumper · February 13, 2004

<HEAD>
.
.
.		
<script language="javascript">
	function jsCheckedChange()
	{
		if (document.all["CheckBox1"].checked)
		{
			document.all["CheckBox2"].disabled = false;
			document.all["CheckBox2"].parentElement.disabled = false;
		}
		else
		{
			document.all["CheckBox2"].disabled = true;
			document.all["CheckBox2"].parentElement.disabled = true;
			document.all["CheckBox2"].checked = false;
		}
	}
</script>
</HEAD>
.
.
.
<form id="Form1" method="post" runat="server">
   	<asp:CheckBox id="CheckBox1" runat="server" onclick="jsCheckedChange();"></asp:CheckBox><br>
<asp:CheckBox id="CheckBox2" runat="server" Enabled="false"></asp:CheckBox>	
</form>
.
.
.

g_r_a_robinson · February 13, 2004

thanks for all your help, i'm going to give it a go right now!!

g_r_a_robinson · February 14, 2004

Thanks WebJumper the suggestions worked great.

I do have one problem however on the second to last line you submitted

<asp:CheckBox id="CheckBox1" runat="server" onclick="jsCheckedChange();"></asp:CheckBox>

The compiler gives me an error saying:

C:\My Documents\Visual Studio Projects\DuTest\Bak1\WebFiles\modules\JobAdder.ascx(71): Could not find any attribute 'onclick' of element 'CheckBox'.

Is there another way?

Thanks

WebJumper · February 15, 2004

you can try this:

.
.
.
<script language="javascript">
function jsInit()
{
   document.all["CheckBox1"].attachEvent("onclick", jsCheckedChange) //note: funtionname wirthout ()
}
</script>
.
.
.
<body onload="jsInit();">
.
.
.

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