RE: GetPostBackEventReference - dynamic argument

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Hello Monty,

From your description, you're developing a custom ASP.NET webserver control
which need to do the following things:

** include multiple <div> elements
** let the each <div> raise a control postback event when user click on it
** pass the client-side <div> ID (which trigger the postback event) into
the __doPostBack client procedure,

is this correct?

Based on my research, when you use
Page.ClientScript.GetPostBackEventReference method, it will always treat
the second parameter(argument) as a plain string text and the output script
statement will wrapper it with a single quote pair( ''). If you want to
embeded script code, you can do an additional replace on the returned
script statement. e.g.

========================
protected override void OnPreRender(EventArgs e)
{
base.OnPreRender(e);

string dopost1 =
Page.ClientScript.GetPostBackEventReference(this, "{0}");
string dopost2 =
Page.ClientScript.GetPostBackEventReference(this, "{0}");


div1.Attributes["onclick"] = dopost1.Replace("'{0}'",
"event.srcElement.id");
div2.Attributes["onclick"] = dopost2.Replace("'{0}'",
"event.srcElement.id");
}
=========================

Or if you're also attaching an "onclick" handle for each "<div>" tag, you
can consider directly embeded the div's "ClientID" statically, e.g.

===================
protected override void OnPreRender(EventArgs e)
{
base.OnPreRender(e);

string dopost1 =
Page.ClientScript.GetPostBackEventReference(this, div1.ClientID);
string dopost2 =
Page.ClientScript.GetPostBackEventReference(this, div2.ClientID);


div1.Attributes["onclick"] = dopost1;
div2.Attributes["onclick"] = dopost2;
}
=========================

Hope this helps some.

Sincerely,

Steven Cheng

Microsoft MSDN Online Support Lead



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