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Void firing before changes

Posted on 2011-09-06
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Last Modified: 2012-05-12
I've got an asp.net page with a void that I run whenever one of two dropdowns chages. It does some counting and sets the datasource of a gridview for me. It's doing what I want...almost.

The problem is I've got some parameters which I attempt to set before I call it (UserName, Start and End Date). But, they don't actually change until after it runs. That happens on page_load and in any postbacks.   "On paper" my parameters are changed first. Bottom line, my counts and gridview appear to be one step behind.

I can get something almost right setting the void to run on an selected value changes in the two dropdowns, but my load event doesn't work that way.
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Question by:jdcollins21
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Accepted Solution

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David H.H.Lee earned 2000 total points
ID: 36494155
Hi jdcollins21,
How you invoke the Postback code in page_load event, through client script or server script?
You can put the existing controls inside <asp:updatepanel>, call from Page_Load event(code behind).
eg:
Private Page_Load(){
  if(!IsPostBack){
    CallDropDownSelectedIndexChanged_Event(null,null);//call your selectedindexchanged event
  }
}

Or, you can call the client script manually.
<script language='Javascript'>
__doPostBack('__DrpDownListID', 'YourCustomArgument');
</script>
Sample:
http://www.dotnetspider.com/resources/1521-How-call-Postback-from-Javascript.aspx

But, this is depending how your control your flow and the way you invoke the script based on your real situation.
Please provide more details if you seek any further assistance.
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