call a javascript function within code behind

#1

i want to call a java script function from code behind.

in page1.aspx page i placed script'

<script language="javascript">
function SetSelected()
{
infoTextBox.select();
}
</script>

i want to highlight text in infotextbox in some cases. so i want to
call this function within code behind.(within if statment).
how can i call this function .i tried with RegisterClientScriptBlock()
but i could not do it .but i think it can be used. can u tell me how a
java script function is called.

thankx

#2

There are several ways to do it.One approach is add the javascript in hidden
field like this..
<asp:HiddenField ID="test" runat="server" />
<script type="text/javascript">
if(document.all["test"].value == "1")
{
//whtever the script
document.all["test"].value ="";
}
</script>

and in the if condition set the "test" field to 1.
Hope this helps.

"sajithkahawatta" wrote:

Quote:

i want to call a java script function from code behind.

in page1.aspx page i placed script'

script language="javascript"
function SetSelected()
{
infoTextBox.select();
}
/script

i want to highlight text in infotextbox in some cases. so i want to
call this function within code behind.(within if statment).
how can i call this function .i tried with RegisterClientScriptBlock()
but i could not do it .but i think it can be used. can u tell me how a
java script function is called.

thankx

#3

There are a few options depending on what you're looking for. I'm assuming
you're using standard HTML controls since you're highlighting with JavaScript.

Give this a try:

Your ASPX page looks similar to:

<form id="form1" runat="server">
<div>
<input id="infoTextBox" name="infoTextBox" runat="server" />
<input id="infoHighlight" runat="server" type="button" value="Highlight"
onfocus="return infoHighlight_onfocus()" />
</div>
</form>

Your script in the <head> block would look like:

<script language="javascript" type="text/javascript">
// <!CDATA[

function infoHighlight_onfocus() {
document.forms[0].elements["infoTextBox"].select();
}

// ]]>
</script>

If you're using .NET Server Controls, you could modify this to be:

<form id="form1" runat="server">
<div>
<asp:TextBox ID="infoTextBox" runat="server" />
<asp:Button ID="infoHighlight" runat="server" Text="Highlight" onclick="infoHighlight_Click"
/>
</div>
</form>

And in the codebehind (default.aspx.cs), a quick method that you could reuse
for any control:

private void SelectControl(Control ctl)
{
StringBuilder sb = new StringBuilder();
sb.Append("<script type='text/javascript'>");
sb.Append(String.Format("document.getElementById(' {0}').select();",
ctl.ID));
sb.Append("</script>");
this.Page.RegisterStartupScript("setFocus", sb.ToString());
}

And to call it, the onClick event of your button:

protected void infoHighlight_Click(object sender, EventArgs e)
{
SelectControl(infoTextBox);
}

HTH.

-dl

--
David R. Longnecker
http://blog.tiredstudent.com

s> i want to call a java script function from code behind.
s>
s> in page1.aspx page i placed script'
s>
s> <script language="javascript">
s> function SetSelected()
s> {
s> infoTextBox.select();
s> }
s> </script>
s>
s> i want to highlight text in infotextbox in some cases. so i want to
s> call this function within code behind.(within if statment).
s> how can i call this function .i tried with
s> RegisterClientScriptBlock()
s> but i could not do it .but i think it can be used. can u tell me how
s> a
s> java script function is called.
s> thankx
s>

#4

thanx everyone for reply.
dear David R. Longnecker i used your code and it is
worked.
thanx again

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call a javascript function within code behind

ASP.net Web Controls microsoft.public.dotnet.framework.aspnet.webcontrols

call a javascript function within code behind - 06-20-2007 , 07:14 AM

RE: call a javascript function within code behind - 06-20-2007 , 07:31 AM

Re: call a javascript function within code behind - 06-20-2007 , 09:01 AM

Re: call a javascript function within code behind - 06-21-2007 , 12:27 AM