Do AJAX Callback Before Each Postback For Webforms?
Oct 6, 2010
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.
Our clients are not happy with this and want the row to be saved automatically if the user forgets to do so himself. Luckily the DevExpress gridview is smart enough to have an "Update()" method which I can call from JavaScript. Unluckily that causes a callback and returns immediately. If I allow the postback to continue as normally, the callback will get aborted. Well, technically it's a race condition I guess, but so far it seems that the postback wins. There are events to which I could attach for success/failure of the callback, but I don't know how to "resume" the postback that started it all. We could turn off callbacks for all the grids, but that would be a performance disaster.
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May 3, 2010
But I have another problem, my gridview is inside UpdatePanel and when I click on prev or next button I get exception: "Sys.WebForms.PageRequestManagerServerErrorException: Invalid postback or callback argument. Event validation is enabled using <pages
enableEventValidation="true"/> in configuration or <%@ Page EnableEventValidation="true" %> in a page. For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them. If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation."
Do you know what should I do to make it work?I don't think that I should change enableEventValidation to "false" maybe I should use ClientScriptManager.RegisterForEventValidation? But I don't know how to use it.
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Jan 21, 2010
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[Code]....
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Nov 21, 2010
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I have a web page that contains a number of update panels containing collapsed panels, some of which have data loaded on expand.To achieve this I have added a java script function:
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$find('cpe2').add_expandComplete(postBack2); [code]....
With the PostBack1 - 4 functions clicking hidden buttons that are triggers for the update panels (and inside the panels) that then run the loads. In some of these it binds a grid to an object datasource in others it just fils in some screen elements from a database table.
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<asp:AsyncPostBackTrigger ControlID="btnUpdate1" EventName="Click" />[code].....
What I am finding is that the ones which load screen elements work perfectly. The FIRST one of the two grid binding ones also works perfectly, and it doesn't matter which I open first (both up1 and up2 will work if they are first and correctly bind the grid). However if I open either of the grid binding panels then attempt to open any other panel I receive:
"Sys.WebForms.PageRequestManagerServerErrorException: Invalid postback or callback argument. Event validation is enabled using <pages enableEventValidation="true"/> in configuration or <%@ Page EnableEventValidation="true" %> in a page. For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them. If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation."
However this only occurs if I hit either up1 or up2, I can open and close up3 and up4 as often as I like with no error as long as I do not open up1 or up2.Turning off Page event validation does solve the problem, but I am concerned about page vulnerability.
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Server Error in '/' Application. Invalid postback or callback argument. Event validation is enabled using in configuration or <%@ Page EnableEventValidation="true" %> in a page. For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them.
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Description: An unhandled exception occurred during the execution of the current web request. review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.ArgumentException: Invalid postback or callback argument. Event validation is enabled using in configuration or <%@ Page EnableEventValidation="true" %> in a page. For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them. If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation.
Source Error:
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
Stack Trace:
[code]....
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[Code]....
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Invalid postback or callback argument Here is my code.
[Code]....
[Code]....
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System.ArgumentException: Invalid postback or callback argument. Event validation is enabled using in configuration or <%@ Page EnableEventValidation="true" %>in a page. For security purposes, this feature verifies that arguments to postback or callback events
originate from the server control that originally rendered them. If the data is valid and expected, use the ClientScriptManager.
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System.Web
at System.Web.UI.Page.HandleError(Exception e) at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) at System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean
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<script type="text/javascript">
function configureDropDownLists(ddl_religion,ddl_caste) {
var Hindu = new Array('Ahom', 'Brahmin-other', 'Intercaste','Kalita','Kayastha','kshatriya','Manipuri','Maratha','Nepali','Rajbonshi','Rajput','SC','ST','Vishwakarma','Other');
var Muslim = new Array('Ansari', 'Arain', 'Awan','Bohra','Dekkani','Dudekula','Jat','Malik','Qureshi','Khoja','Memon','Mughal','Pathan','Mapila','Shafi','Sheikh','Syed','Siddiqui','Other');
[Code] ....
Everything is working fine and i am able to update the second dropdownlist based on the item selected in the first dropdownlist.
The problem is that i am not able to capture the data to a cs file and upload then it to database and i am getting this error:
For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them.
If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation
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