PageMethod calls are not asynchronous

I created a test app to try out the PageMethod functionality. I can make four calls to a PageMethod and I can verify that they are called asynchronously via the tracing statements. So I moved the test page into an existing website that I converted to AJAX and it appears that the methods are call synchronously. Is there a setting somewhere that I might be missing? It is the exact same page in both sites. Any suggestions are greatly appreciated. I've included the log results and methods for reference.

Test App Trace (This is the expected result. Notice that all of the "In Server Method" entries occur before any of the "Out Server Method" entries):

Post PageMethodsfor 1Post PageMethodsfor 2Post PageMethodsfor 3Post PageMethodsfor 4In Server Method: 1 - 633088835535430360In Server Method: 2 - 633088835538237248In Server Method: 3 - 633088835543249548In Server Method: 4 - 633088835548261848Out Server Method: 4 - 633088835573122856Out Server Method: 3 - 633088835578335648Out Server Method: 2 - 633088835590766152Out Server Method: 1 - 633088835600089030

Converted App Trace(This is not the expected result. Notice that the "In Server Method" entries alternate with the "Out Server Method" entries):

Post PageMethodsfor 1
Post PageMethodsfor 2
Post PageMethodsfor 3
Post PageMethodsfor 4
In Server Method: 1 - 633088837286126504
Out Server Method: 1 - 633088837375044706
In Server Method: 2 - 633088837378352824
Out Server Method: 2 - 633088837407023180
In Server Method: 3 - 633088837408627116
Out Server Method: 3 - 633088837421057620
In Server Method: 4 - 633088837423664016
Out Server Method: 4 - 633088837477596364

Server Method:

 [WebMethod]public static int GetHitCount(int grid) { Debug.WriteLine("In Server Method: " + grid.ToString() +" - " + DateTime.Now.Ticks.ToString());int sleep = rand.Next(1000, 10000); System.Threading.Thread.Sleep(sleep); // Sleep to slow down the process Debug.WriteLine("Out Server Method: " + grid.ToString() +" - " + DateTime.Now.Ticks.ToString());return rand.Next(1, 100); }

Client Methods:

function GetAllData() { PageMethodCall(1); PageMethodCall(2); PageMethodCall(3); PageMethodCall(4); } function PageMethodCall(context) { var waitImg = document.getElementById("imgWait" + context); waitImg.style.visibility =''; PageMethods.GetHitCount(context,OnSucceeded, OnError, context); Sys.Debug.trace('Post PageMethods for ' + context); }

Ok, I still don't have a good solution but I've found the problem. Though a process of elimination, I've determined that the existance of a Global.asax file is causing the problem. When I got into my test project and select "Add New Item" -> "Global Application Class", the request begin to queue. I have made no changes to the Global.asax.

Hi there, this is some kind of combined issue. -- It's about the session access. Strange ,right? What you can try is to set "enableSessionState="false|ReadOnly", the request is executed asyncronously. But as long as you change to true which is the default, your requests are piped up.

Note, the pipe-up behavior only happens for the requests from the same browser. If you have two browsers, it is always executed asyncronously.

The things that I haven't found out is where this crappy logic is. If you take a look at the system generated global.asax.cs , it is quite clean. I guess it is somewhere in HttpApplication which is the base class.

Hope this could help a bit.

Access to Session state variables must be performed synchronously. You can either set EnableSessionState to false or readonly, or you can use a different session state provider that allows asynchronous access to state variables.

PageMethods

Hi,

I ama developing web application using ASP.NET, and I use atlas framework in my app. I have a problem with using PageMethods, I want to return value which came from page to another javascript but I can not,

Normal Page Method usage

function sayHelloFromPage() {

PageMethods.HelloWorld('Mehmet',onComplete);

}

function onComplete(result) {

}

what I wantto make it

functioncallSayHelloFromPage() {

var Result = sayHelloFromPage();

}

function sayHelloFromPage() {

PageMethods.HelloWorld('Mehmet',onComplete);

}

function onComplete(result) {

return result;

}

Hi

PageMethods.HelloWorld('Mehmet',onComplete);

The above call happens asynchronously, which means the call is send to the server and the client does not wait for the call to complete; therefore, you don't see the results immediately instead you have to get the results in the onComplete event, which is fired when the call completes.

Whatever you want to do with the results, e.g. change an HTML element, you have to do it in the onComplete function.

PageRequestManagerParserErrorException caused by Response diddling?

I am porting an old app that downloads a csv file by writing into Response.OutputStream when a button is pushed on the form. The button is contained in an asp:Panel that can be made visible or not, so the Panel needs to be contained in the UpdatePanel.

If the asp:Panel and button are in an update panel, I get PageRequestManagerParserErrorException. If the panel and button are NOT in an UpdatePanel, the download works okay, but of course, I lose the ability to show/hide the asp:Panel.

My question is--is there a way to have a button in an UpdatePanel, but tell it NOT to participate in partial page rendering?

Or is there a better way to do the download??

Thanks,

R.L.

Hi Rlparker,

If you want a button not to participate in partialrendering then you have to make sure that you the button as a postback trigger. This will make sure that the button will act normally as a normal button event. See:

http://ajax.asp.net/docs/mref/T_System_Web_UI_PostBackTrigger.aspx

Hope this helps.

Regards,

Sorry

"you have to make sure that you the button as a postback trigger"

you have to make sure that you define the button as a postback trigger

Regards,

Thanks!!

R.L.

Partial rendering issue with AJAX

I have following code working fine with ATLAS with partial rendering in IE and Firefox. But after I move the app to AJAX beta 1.0, it causes the the whole page rendering with Firefox 2.0 but it works fine with IE 6.x.

function setID(myID)
{
opid = document.getElementById ('<%=txtMyID.ClientID%>');
opid.value=myID;
document.getElementById('<%=ibtnMyButton.ClientID%>').click();
}

The page looks like:

<asp:UpdatePanel ID="UpdatePanel1" RenderMode="Inline" UpdateMode="Conditional" runat="Server">
<ContentTemplate>

<asp:UpdatePanel ID="UpdatePanel2" RenderMode="Inline" UpdateMode="Conditional" runat="Server">
<ContentTemplate>

<asp:TextBox ID="txtMyID" runat="server" ></asp:TextBox>

<asp:ImageButton ID="ibtnMyButton" runat="server" ImageUrl="../Images/go.gif"></asp:ImageButton>
........

</ContentTemplate>
</asp:UpdatePanel>

</ContentTemplate>
</asp:UpdatePanel>

How to solve this issue?

Try to change your codes as the following.
<asp:UpdatePanel ID="UpdatePanel1" RenderMode="Inline"ChildrenAsTriggers="false" UpdateMode="Conditional" runat="Server">
<ContentTemplate>
<asp:UpdatePanel ID="UpdatePanel2" RenderMode="Inline"ChildrenAsTriggers="false" UpdateMode="Conditional" runat="Server">
<ContentTemplate>
<asp:TextBox ID="txtMyID" runat="server" ></asp:TextBox>
<asp:ImageButton ID="ibtnMyButton" runat="server" ImageUrl="../Images/go.gif"></asp:ImageButton>
........
</ContentTemplate>
</asp:UpdatePanel>
</ContentTemplate>
</asp:UpdatePanel>
Wish the above can help you.
Thank you, Jasson, It works.