AJAX :: Can Measure The Elapsed Time For A Callback Roundtrip

Jun 23, 2010

Is it possible to measure the elapsed time from when a user clicks an 'ajaxified' button until the ajax controls are updated?

I'm using ASP.Net v4, Visual Studio 2010, C#, and the MS AjaxToolkit.

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Whenever a postback would occur (AJAX'ed by an UpdatePanel) I want to do a callback beforehand and only after the callback has completed (either successfully or not) should the postback occur. How can I do this?

Elaborate explanation: We use ASP.NET AJAX (UpdatePanel 'n stuff) together with DevExpress controls. Among those controls is the ubiquitous GridView. As is typical with ASP.NET gridviews, you can edit rows one-by-one, and to save your changes you have to hit the "update" button at the end of the row. However if you make some changes to the row, then forget to press the "update" button, and hit something else in the page (say the big red SAVE button that causes a postback and saves the whole form to the DB), your changes will be lost. The row will still be in edit mode, but it will have reset to the data it had initially when you started the edit.

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I have a updatepanel which contains of a few dynamically created ImageButtons (the ImageButtons are placed in a panel inside the updatepanel) Since the imagebuttons are children of the updatepanel they automatically triggers a callback to server, fine. But I want the user to be able to cancel the callback after clicking on the imgbutton, preferably through a javascript window.confirm.

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aspx file
if(window.confirm('Cancel callback?') )
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<asp:UpdatePanel ..... >
<asp:panel id="myPanel" ........ ></asp:Panel>
aspx.cs file
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AJAX :: Recover Parameter In Callback Function

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I'm using ajax to call a webmethod from javascript. The call is successfully made to the webmethod but I'm not able to access the parameters I passed to the webmethod inside of the "OnSucceeded" callback method. I need access to those params because I need to perform more tasks on the client side when the webmethod returns. I'm assuming that the params are returned inside "usercontext", but the value of that param is "null" How can I have access to those params?

Here my sample code:

function OnSucceeded(result, usercontext , methodName)
alert( result + ' The value of usercontext is: ' + usercontext);
function OnFailed(error, userContext, methodName)
alert('Attempt to delete semantic attribute from page failed!');
function deleteSemanticAttribute()
var username = 'xxxxxx';
var password = 'yyyyyy'
PageMethods.GetMyData(username, password, OnSucceeded,OnFailed);
public static string GetMyData(string username, string password)
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I have updatePanel in my ASP.NET 2.0 (migrated from ASP.NET 1.1) web app. It doesn't work as it always postback instead of callback. I already set<xhtmlConformance mode="Transitional" /> but still not working. Previously, it just working.


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Jan 4, 2010

I have Russian blog built with BlogEngine.NET 1.5.

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Using Fiddler I found out that IE tries to send AJAX callback using WebForm_DoCallback to wrong address - it seems that it decodes URL, gets wrong characters and asks page with that wrong address from server and (of course) receives 404.

Here is how incorrect request from IE looks in Fiddler:

POST /ru/post/�������������-�����.aspx HTTP/1.1

Here is how FF makes same request and gets correct response:

POST /ru/post/%D0%92%D1%81%D1%82%D1%83%D0%BF%D0%B8%D1%82%D0%B5%D0%BB%D1%8C%D0%BD%D0%BE%D0%B5-%D1%81%D0%BB%D0%BE%D0%B2%D0%BE.aspx HTTP/1.1

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