Page_Load always executed - can this be changed?

Hello,

I started using <asp:UpdatePanel> to update controls content in my page.

This work really great, and the Look and Feel are perfect.

However, in the page I load many controls dynamically in the Page_Load - it can reach thousands of controls.

Each of the controls contains UpdatePanel that has UpdateMode of "Conditional" - this let me change the contents of each control without affecting the other controls.But, and here finally come the catch, I noticed the whole Page_Load is executed. When there will be thousands of controls, I would like to Load them only once, then have AJAX code that would not cause the whole Page_Load to run again.

Is this possible? Can we make the AJAX read other page maybe?

Thanks in advance. :)

If you want to only run the code on the initial Page Load, you can throw everything in if(!Page.IsPostBack && !Page.IsCallBack). We use that method for most stuff, but if you use 3rd party controls, there may be some issues... We use telerik controls and they do a post back like event, which isn't caught by that.

Well, if I add if (!Page.IsPostBack) then the controls are lost, as they're not static in the page but rather created on the fly using Page.LoadControl method.

What I'm trying to achieve is that different page will be called by the AJAX "engine". So far my investigations on this bore no fruit. Any ideas?

PageError event of scriptmanager not firing

I have a content page that has a master page. I have an updatepanel and a scriptmanger in my content page. I defined a handler for OnPageError for the scriptmanager and defined a error template for the scriptmanager but when I set the e.errormessage in the OnPageError event, but if I set a break point in the event, the break point is never reached and the error message in the template still displays 'unknown error' Any ideas?

if I put a button on the page and in the click event of the button i manually throw and error.

thrownewException("error button clicked");

the event fires and works fine.

but if I put some invalid characters like '<img src' inside a textbox and then click the button (removing the throw) then the OnPageError isn't fired

PageMethod problems

Hi Everyone -

I have a master page setup, and i would like to use ajax in one of the pages that are to be used as a content page.

In the javascript portion of the detail page, i have some procedures that are marked as webmethods

 [WebMethod()]public void LoadGrid3() {#region LoadGrid3 DataSet ds3 =new DataSet(); DataTable dt3 = ds3.Tables.Add("Customer");

In the javascript side (presentation)

"javascript" type="text/javascript"> function findData() { var request; var AlertDiv = document.getElementById("AlertDiv"); AlertDiv.style.display =""; request = PageMethods.Update(onSearchComplete);} function onSearchComplete(results) { var AlertDiv = document.getElementById("AlertDiv"); AlertDiv.style.display ="none"; alert(results);} function findData_callback(res){ alert("here");}

script language="javascript" type="text/javascript"> function findData() { var request; var AlertDiv = document.getElementById("AlertDiv"); AlertDiv.style.display =""; request = PageMethods.Update(onSearchComplete);} function onSearchComplete(results) { var AlertDiv = document.getElementById("AlertDiv"); AlertDiv.style.display ="none"; alert(results);} function findData_callback(res){ alert("here");} script>

"text/C#" runat="server"> [WebMethod]public void Update() { LoadGrid3(); }

scripttype="text/C#"runat="server">

[WebMethod]

publicvoid Update()

{

LoadGrid3();

}

script>

On the button click event - i have it call the function findData

the PageMethods get popped as an error

Microsoft JScript runtime error: 'PageMethods' is undefined

Am i missing something somewhere??

thanks

tony

Hi,

PageMethods must be declared as public static methods in beta1.

partial page update

hi, just learning the ajax for asp.net and would like to know how can i update the content by putting another control inside the update panel.

for example, inside this control panel, there is a label, when i click on the button, the label will disappear and then the login control will be visible? sorry, just a newb in asp.net and ajax. thanks in advance.

Hi,

Just place them inside the UpdatePanel and code your controls as what you do using postback.

Does that make sense?

<asp:UpdatePanel ID="UpdatePanel 1" UpdateMode="Conditional" runat="server">
<ContentTemplate>

<!-- Your control Lable,Button etc -->

</ContentTemplate>
</asp:UpdatePanel>