Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people, just like you, are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
Solved

asp.net - last event that fires on a page

Posted on 2013-05-14
3
349 Views
Last Modified: 2013-05-16
In this code snippet I am loading a control at runtime.

"ptg"


I try to call a public method of the control  (  "HideFrame"  ) which turns some <div> tags invisible, because under this circumstance, I don't want them to show.

It fails because I think the HTML for the "ptg" control is not full rendered.



  Reo.ContentControls.PostponedTaskGridPopup ptg = ((Reo.ContentControls.PostponedTaskGridPopup)LoadControl("~/ContentControls/PostponedTaskGridPopup.ascx"));


                    ptg.FillVariablesThroughPassedInData(assetTaskIdSid, this.AssetIdSid, "normal");

                    

                    Table t = new Table();
                    TableRow trName = new TableRow();
                    TableRow trRole = new TableRow();
                    TableRow trDate = new TableRow();
                    TableRow trLink = new TableRow();


                    t.Rows.Add(trName);
                    t.Rows.Add(trDate);
                    t.Rows.Add(trRole);
                    t.Rows.Add(trLink);


                    TableCell tdName = new TableCell();
                    TableCell tdRole = new TableCell();
                    TableCell tdDate = new TableCell();
                    TableCell tdLink = new TableCell();

                    TableCell tdPostpone = new TableCell();

                    tdPostpone.RowSpan = 4;

                    trName.Cells.Add(tdName);
                    trName.Cells.Add(tdPostpone);
                    trRole.Cells.Add(tdRole);
                    trDate.Cells.Add(tdDate);
                    trLink.Cells.Add(tdLink);


                    tdName.Controls.Add(lbl);

                    tdPostpone.Controls.Add(ptg);









/////////// THIS FAILS //////////////////////
                    ptg.HideFrame();

Open in new window





 public void HideFrame()
        {
            //hide surrounding divs and layout stuff
            
            HtmlGenericControl fh = ((HtmlGenericControl)FindControl("frame_header"));
            HtmlGenericControl fr = ((HtmlGenericControl)FindControl("frame"));
            fh.Visible = false;
            fr.Attributes.CssStyle.Clear();
        }

Open in new window




//fails
fh.Visible = false

fails because fh is null.


I think it is because the page rendering is not far enough along to be able to hide the <div>.

So my question is - how can I know when it is safe to hide the control (the div)
0
Comment
Question by:knowlton
  • 2
3 Comments
 
LVL 18

Accepted Solution

by:
Jerry Miller earned 500 total points
ID: 39166964
This may help you out. It explains the  page life cycle in asp.net.

http://msdn.microsoft.com/en-us/library/ms178472%28v=vs.100%29.aspx

The PreRender event may be the one that you need.

"Occurs after the Control object is loaded but prior to rendering."

http://msdn.microsoft.com/en-us/library/system.web.ui.control.prerender%28v=vs.100%29.aspx
0
 
LVL 5

Author Comment

by:knowlton
ID: 39168402
I tried PreRender.

I also tried Page_Unload, which I think is the last event  (but I think it fires after the page has been sent to the client, so is of no use)

Is there something **right before** Page_Unload, but after Pre_Render?  Like a "Post_Render" ??

I'll take a closer look at the page life cycle.
0
 
LVL 5

Author Closing Comment

by:knowlton
ID: 39172064
I eventually solved this with jQuery:


 $('div[id*="_divPostponedTaskGrid"]').each(function () {

            var tablecount = $(this).children('div').children().size();
           
            if (tablecount == 0) {
                $(this).closest('#frame').hide();
            }
            else {
                $(this).closest('#frame').css('background-image', 'none');
            }
        });

Open in new window

0

Featured Post

The New “Normal” in Modern Enterprise Operations

DevOps for the modern enterprise offers many benefits — increased agility, productivity, and more, but digital transformation isn’t easy, especially if you’re not addressing the right issues. Register for the webinar to dive into the “new normal” for enterprise modern ops.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Wouldn’t it be nice if you could test whether an element is contained in an array by using a Contains method just like the one available on List objects? Wouldn’t it be good if you could write code like this? (CODE) In .NET 3.5, this is possible…
A long time ago (May 2011), I have written an article showing you how to create a DLL using Visual Studio 2005 to be hosted in SQL Server 2005. That was valid at that time and it is still valid if you are still using these versions. You can still re…
This is Part 3 in a 3-part series on Experts Exchange to discuss error handling in VBA code written for Excel. Part 1 of this series discussed basic error handling code using VBA. http://www.experts-exchange.com/videos/1478/Excel-Error-Handlin…
The Email Laundry PDF encryption service allows companies to send confidential encrypted  emails to anybody. The PDF document can also contain attachments that are embedded in the encrypted PDF. The password is randomly generated by The Email Laundr…

809 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question