Run javascript function

Hello, I have a javascript function updateRatings() on a page.

How can I run that fucntion from code behind?  It tried :
                Page.RegisterStartupScript("FocusScript2", "<script type='text/javascript'>updateRatings();</script>")
but it didn't work.

Thanks

grogo21Asked:
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silemoneCommented:
what event and object do you want it to run off?

is it the body tag you want it to run off off?
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grogo21Author Commented:
I have a button inside an update panel.  After the partial page postback I want to run the javascript function.  I had the following line:
Page.RegisterStartupScript("FocusScript2", "<script type='text/javascript'>updateRatings();</script>")
in the buttons click event in the code behind but the javascript function doesnt run.

Thanks
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samtran0331Commented:
since you're doing a partial postback, you don't actually have access to the whole page to do a Page.RegisterStartupScript

try using the ScriptManager to RegisterStartupScript

ex.
ScriptManager1.RegisterStartupScript(...etc
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silemoneCommented:
Here is a way to do it:  This uses PageRequestManager which finds which object in an UpdatePanel is calling a postback...you can do things before the postback like test conditions...but what you want to do is do something at the end Request function


<script type="text/javascript">        
          var prm = Sys.WebForms.PageRequestManager.getInstance();
          prm.add_initializeRequest(InitializeRequest);
          prm.add_endRequest(EndRequest);        
          var executingItem = null;
         
           function InitializeRequest(sender, args) 
           {
            var postBackElement = args.get_postBackElement();            
            if(postBackElement != null)
            {  
             
             if (postBackElement == (document.getElementById("<%=Button.ClientID %>")))
             {
                  
             }
            }
            
          }
 
          function EndRequest(sender, args) 
          {                
                       if (postBackElement == (document.getElementById("<%=Button.ClientID %>")))
             {
                     //call a javascript method here at the end of postback
             }
            
 
          }
          

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samtran0331Commented:
should add that there are more parameters when you use the script manager to register startup script...

Me.ScriptManager1.RegisterStartupScript(Me.Page, Me.Page.GetType(), "FocusScript2", "<script type='text/javascript'>updateRatings();</script>", False)
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silemoneCommented:
One below should work fine for you...
<script type="text/javascript">        
          var prm = Sys.WebForms.PageRequestManager.getInstance();
          prm.add_initializeRequest(InitializeRequest);
          prm.add_endRequest(EndRequest);        
          
         
           function InitializeRequest(sender, args) 
           {
            postBackElement = args.get_postBackElement();            
            if(postBackElement != null)
            {  
             
             if (postBackElement == (document.getElementById("<%=Button.ClientID %>")))
             {
                  
             }
            }
            
          }
 
          function EndRequest(sender, args) 
          {                
                       if (postBackElement == (document.getElementById("<%=Button.ClientID %>")))
             {
                     updateRatings();
             }
            
 
          }
          
 </script>
    

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silemoneCommented:
so to explain the code:  You are using PageRequestManager, something that's actually good to learn if working with UpdatePanels...

first 3 lines:  var prm....prm.add_endRequest   -->  when working with UpdatePanel, the page can be broken into a few events...ones we are worried about not iw initializationRequest and EndRequest...I created two functions, and assigned them with this line:  prm.add_initializeRequest(InitializeRequest);...etc...if i wanted initialization function to be called snoopy then i would have said  prm.add_initializeRequest(Snoopy);

in the initializeRequest function all i did was
1) get what is causing the postback and store in a global variable postBackElement(notice i didn't put var in front of postBackElement to make it's scope global.).
2) I test if the postBackElement to see if it was cause by a certain button...I used <%=Button.ClientID%>")
because I'm using masterpages and with masterpages, elements within it id's are changed to include ctl00_....so I use server tags to get object easier.  

in EndRequest, after postback, I check my global postBackElement and see if it was by a certain button and if so, i call the method you wanted called.

This is cool because it's javascript, plus you can stop cancel postbacks at any point if you need to based on some condition.
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Saqib KhanSenior DeveloperCommented:
another easy way of doing is.. whereever you want to execute the javaScript Function within page add an Literal Control. and when you press the button set the text of Control to execute the function.
 
Literal.text = "<script>myfunction()</script>"
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