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GetPostBackEventReference - dynamic argument


GetPostBackEventReference - dynamic argument Monty
1/15/2007 12:21:53 PM
asp.net building controls:
Hello,

I'm building a sever control that is essentially a container that holds a
bunch of DIVs. I want the click event on any of the DIVs to bubble up to the
container which calls the __doPostback procedure as given by the server-side
call to ScriptManager.GetPostBackEventReference(Me, sArg). I only want to
have the __doPostback call on the table level, not on each and every Div
(there are a lot). So, essentially I would like my call to look like this:

__doPostback ('My$Control1', e.srcElement.id)

Unfortunately, GetPostBackEventReference provides the second argument in
quotes, so it looks like this:

__doPostback ('My$Control1', 'e.srcElement.id')

And therefore my return argument is the literal value "e.srcElement.id", not
the ID of the source element as I would like. Any help here? I could
hardcode the call like this:

"__doPostback(" & me.UniqueID & ", e.srcElement.id)"

but I'm trying to do it the "right" way. Any suggestions?? TIA,

Monty

RE: GetPostBackEventReference - dynamic argument stcheng NO[at]SPAM online.microsoft.com
1/16/2007 7:10:01 AM
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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Re: GetPostBackEventReference - dynamic argument Monty
1/16/2007 11:56:35 AM
Yes, that first method helps. Much better than hard-coding. Thank you!

[quoted text, click to view]

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