Asp.net page life cycle error, [duplicate]

问题

Possible Duplicate:
how to call a javascript fn in Update panel on Partial postback in asp.net

update panel is doing partial post back, and I have a Timer_Tick method where I call the method to do data binding and updatepanel onLoad for some calculation for graph. I use a Javascript to draw the graph

 window.onload = function () {
      r.init();
    };

SO the graph is displayed when the page loads, when the update panel updates after 4 seconds the r.init is not called. I tried many things. the graph disappears. can someone give me a example of how to execute the JavaScript after the page partial postback.

<asp:UpdatePanel runat="server" ID="Holder" OnLoad="Graphstats" UpdateMode="Always" ChildrenAsTriggers="True">
                <ContentTemplate>
...
                   <asp:Timer ID="Timer1" runat="server" Interval="3000" OnTick="Timer_Tick" />
            </ContentTemplate>
        </asp:UpdatePanel>

回答1:

I believe that within Timer_Tick, you need to set it up to call that script again when it's rendered using RegisterStartupScript.

string script = "<script type=text/javascript>r.init();</";
script+= "script>";

Page.ClientScript.RegisterStartupScript(this.GetType(), "GraphInit", script);

ClientScriptManager.RegisterStartupScript

回答2:

Your site has an asp:ScriptManager. This control communicates with the PageRequestManager object in Javascript. You can hook into all communications of updatepanels with your code.

beginRequest
endRequest
initializeRequest
pageLoaded
pageLoading

I think pageLoaded is the best for your approach.

<script type="text/javascript">
window.onload = function () {
  // PageLoad for sync only
  r.init();
}; 

Sys.WebForms.PageRequestManager.getInstance().add_pageLoaded(function(sender, args) {
  // PageLoad for sync and async!
  r.init();
});
</script>

You can extend the code to check which control caused the post in order to optimize your code.

MSDN: Sys.WebForms.PageRequestManager

来源：https://stackoverflow.com/questions/7637682/asp-net-page-life-cycle-error

标签

ASP.NET

ajax

updatepanel

page-lifecycle