AJAX :: Script To Prevent Multiple Async And Synchronous Postbacks?
Jan 12, 2010
I am having a problem with users clicking submitting pages multiple times. What is happening is a user will click a link, if nothing happens in .025 seconds they click another link or menu item, etc. I handle users clicking the back button and the impatient user winds up getting directed to my "Dont click the back button" page even though they dont click the back button.
I need to prevent mutiple submits by disabling all submit controls on my pages. I dont have a single submit button, i have pages with menus, gridviews, yada yada that all need to get turned off.
I have pages that use update panels and pages that dont. All my pages inherit from a BasePage class. I would like to solve this problem by implementing the solution in my BasePage class.
I did a little research and found this little script that works for synchronous postbacks:
[Code]....
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Dec 11, 2010
Say I have 2 UpdatePanels on the page and each UpdatePanel has a one server Button each. When I click on the first button and then the second button and look in Firebug, I see that the 2nd async postback is not triggered until the first one completes.
Is this working as expected? My understanding was with AJAX postbacks, the event handlers for the buttons trigger simultaneously.
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Mar 23, 2011
I'm trying to get something like this to work
[Code]....
What I'm looking for is to disable the submit button if any of the inner updatepanels are in postback mode. I would also like some way to block that particular panel. I guess for the outer updatepanel, updatemode should be set to conditional, and usechildrenastriggers should be false. What's really bugging me is how to block the panel while a postback is occurring.
In all my tests thus far, the outer updatepanel's updateprogress is triggered, which blocks the whole page.
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Feb 16, 2010
So I have a page with an UpdatePanel and some controls in there. When I explicitly type/copy+paste the page's address into the address bar, let VS navigate there for me, or follow a link to the page, all of the AJAX works fine. But if I refresh this page, the JS on the page initiates the async postback, but the appropriate event is never called on the server (although Page_Load is) and the client never recieves the markup sent back by the server. This issue seems to be limited to Firefox 3.6 (Gecko build 1/15/2010)(doesn't happen in IE8). I have yet to try on other versions of Firefox.
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Jul 26, 2010
I have a very typical set up, an ajax update panel is updated when a drop list of offices changes. Each form could have it's own values, for instance each store will have it's own list of employees. Here is where the fun begins. The form can be changed by the drop down (new office) or validated and submitted.
On drop down change, I create a new instance of the same rad combo, bind it to the current data, confirm that the correct data is bound. Then on the return trip I see selected the default user from the previous user. This is a composite control, and firebug shows me that the value for the "text box" that simulates the combo still has the old value. I'm suspecting onViewStateLoaded, but turning viewstate off for the Telerik didn't . II don;t need it anyway, cuz I have to put the selected value in another hidden to make a cross page post on submit.
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Jan 9, 2011
I am trying to create a simple web application that uses a barcode scanner to read the barcode and then insert the information into a database. I have been able to get the barcode scanner to read the barcode and place the information into a textbox.
Then using javascript when the enter key is triggered on the scanner it then clicks the button to do a AsyncPostBack on the updatepanel then using scriptManager.RegisterStartupScript I then focus on the text box and then select the text in it ready for a new barcode to be entered.
The problem that I am having is that I can get it to post back 26 times then it will go to error (with no information). If I then add additional controls to the page I can only get it to post back 10 times. Below is my code... I have been pulling my hair out for the last two days.
[Code]....
[Code]....
[Code]....
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Jan 5, 2010
We have an ASP.NET page which uses an update panel for partial page postbacks. On the server side, the postback performs some database work and updates several UI elements. The database code is all contained in several transactions, so the state will still be consistent if an exception is thrown. We're working on some error handling code now, and my first thought was to log the exception thrown, reload the last consistent UI state, and show some sort of modal popup or other ui element with a brief error message for the user (this is an intranet page, so we're automatically notified of the bug, and the users know where to find us.
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Aug 3, 2010
I have a page setup like so:
[code]...
I know lastFocused is getting a value and RestoreFocus is running, but whenever it runs the value of lastFocused is null.
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Sep 9, 2010
We're getting a confusing error on two of our pages in our ASP.NET application. Both pages originaly had tags to reload the page every so often if a user sat on it for a while, but opted to remove those in favor of some AJAX flavoring. Specifically, we created timer controls on the page and wired the timer's tick event as a trigger for an update panel to reload a portion of the page. The page(s) also have scriptmanagers on them as we don't have one on the master page. This largely works great except we're getting a lot of these errors:
"The page is performing an async postback but the ScriptManager.SupportsPartialRendering property is set to false."
It is my understanding that if the .NET framework detects a browser doesn't support partial rendering it will set the ScriptManager.SupportsPartialRendering value to false and we're NOT overriding this in any fashion. Therefore, the pages shouldn't be by performing async postbacks if that value is false, but based on the error the postbacks are still happening and the page is throwing an exception.
Curiously, the user agent always seems to be GoogleBot or "Mozilla/4.0 (Windows 98; US) Opera 10.00 [en]".
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Aug 12, 2010
I'm trying to create a modal popup that has multiple buttons that a user will click to choose options. This is all well and good but when the user clicks an option it fires a full postback. The modal opens async, but I can't get it to hide async. Heres some code:
[Code]....
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Nov 19, 2010
I have an aspx page with a simple form to send emails to pre-defined lists of users. On the longer lists the page usually times out before the emails finish sending but this has never been an issue. Today something weird happened and each user got four emails. In the log I could see three new threads crank up one at a time and start over sending from the beginning of the list.Any ideas? I absolutely know I didn't intentionally refresh the Web page myself, and certainly not three times. But could the browser (IE8) have done it? Would it post again trying to re-establish a connection when it timed out? Or when I switched back to the browser window from another app? I have never seen behavior like this before.
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Feb 28, 2010
What best synchronization feature should I use in my asynccontroller action? [calling while(OutstandingActions > 0) is not an option)],
a. Async fetch 3 items from data service in parallel,
b. synchronize.
c. compute a value using the 3.
d. async save all 3 results to data service in parallel.
e.synchronize.
f. finish
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Sep 14, 2010
I need to gather information (via GET) from several other websites (not under my control), do some processing (specific to each source) on the data returned, and then print all the info out to the user.
Right now I'm making the GET request to website A, waiting for it to return, processing it, then calling website B, and so on... Obviously this is too damn slow. I'd like to make async requests to A, B, and C, then process each response as it comes back, and once I have all the responses, print it all out to the user.
I'm allowed to use classic asp or vb.net. I'm more familiar with classic asp but I'm willing to learn...
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Apr 23, 2010
I'm searching for an example with an client timer that ticks synchronous with an server timer. Also there must be a button on the client side which can reset the server timer to an default value, and with this it also resets the client timer ofcourse. I tried it myself but it seems that there is some postback delay which makes it impossible for me to make it atleast look like it goes synchronous.
I hope somebody got an example for me, the button part is really important because by pressing that button the delay comes.
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Feb 23, 2011
I want to make an async call to the server when an achor tag is clicked and then have the browser advance to the href without waiting for the async call to return a result. I am using System.Web.UI.ICallbackEventHandler. My server code is not executing. The server code only executes if the GetCallbackEventReference call specifies a clientscript value which means the page has to wait before advancing. What am i doing wrong?
My client code is:
<script type="text/javascript">
function ReceiveServerData(arg, context) {
}
function DoAsyncTask(arg)
{
CallServer(arg, '');
return false;
}
</script>
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Mar 29, 2010
I'm working on adding a todo list to a project system and would like to have the todo creation trigger a async postback to update the database. I'd really like to host this in a usercontrol so I can drop the todo list onto a project page, task page or stand alone todo list page.
Here's what I have.User Control "TodoList.ascx" which lives in the Controls directory.
The script that sits at the top of the UserControl. You can see where I started building jsonText to postback but when that didn't work I just tried posting back an empty data variable and removed the 'string[] items' variable from the AddTodo2 method.
<script type="text/javascript">
$(document).ready(function() {
// Add the page method call as an onclick handler for the div.
[code]...
I can have a control that can be used to display multiple todo lists and create a brand new todo list as well.When I click on the #divAddButton I can watch it build the postback in firebug but once it completes it runs the error portion by alerting 'error'. I can't see why.
I'd really rather have the response method live inside the user control as well. Since I'll be dropping it on several pages to keep from having to go put a method on each individual page.
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Dec 9, 2010
I'm running into an issue with an async call to the server that only works one time, then it appears to become a synchronous call. Let me try to explain.
It's an MVC 2.0 site, using ASP.NET and Ajax. I'm using the Ajax.BeginForm helper, like so:
<% using (Ajax.BeginForm("Start", null,
new { virtualMachineId = xyz },
new AjaxOptions { UpdateTargetId = "VirtualMachineForm", OnBegin="OnStartingVm" }
)){
[Code]....
Within the updateStartingStatus function, the first part runs every second, every time. However, within the Ajax call, the success result works every second on the first time only. Then on the second time I click on the start button all of the requests queue up. After the starting has completed, about 20 seconds later, I get a bunch of alert windows back to back. So, I can tell that updateStartingStatus runs every second every time, but the ajax call appears to switch to become a sync call after the first time.
I have to fully close it and open it again. The same occurs in IE and Chrome.
One more thing to note is that the updated div (VirtualMachineForm) contains most of the page, including the button being pressed. So it basically replaces the page from under itself. Not sure if that would cause any issues.
Additionally, if I debug in Visual Studio 2010, the call isn't made to the controller action when the issue occurs. So, it appears to be something client-side. I've ruled out any issues server-side.
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Mar 15, 2010
Since data saving is a time consuming, I would like to call data saving method using Ajax and that too Async what i mean is as soon as the user click submit button it just display the confirmation page and data saving bit keeps going on in the background.
Is this possible using Ajax tool kit?
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Sep 15, 2010
I have a series of div's inside an update panel, these divs have a margin-bottom defined in css. In IE8, when I do a async postback these margins are all removed. All the other styles are fine. If I turn on compatibility mode this does not happen. In Google Chrome the margins are maintained correctly after the async postbacks.
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Apr 27, 2010
I am creating a ASP.Net server control to manage locations. The control is a composite control containing several text-boxes, labels, and a link button. I use the AJAX Control Toolkit to provide a modal popup which contains a Bing map. All the Javascript is in its own file and used as an embedded web resource.
The link button is what opens the modal popup. It also needs to call a Javascript function that initializes the Bing map (onclick = "GetMap();"). There are instances when this server control is placed within an Update Panel (and there is no way to avoid this). When in an Update Panel the link button loses its onclick event. I understand that this is because during an async postback the portion of the DOM that defines the content of the Update Panel is thrown out and reinitialized, resulting in the event breaking. When the control is not in an Update Panel everything works as intended.
I have tried registering events on Page.Load and Page.Init, like so:
[Code]....
I have also tried flat out writing the function call to the page:
[Code]....
I have put breakpoints on the lines inside each delegate and they do not get hit. I am not aware of any special way to register events of a composite control's child control or the Page.Load/Page.Init events when being done inside a server control. Is there some special way to register these events? (Note: Both those code blocks above are in my CreateChildControls() method)
Below is the GetMap() Javascript function. As you can see it is pretty straight forward.
[Code]....
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May 28, 2010
Here is the code. On button click it should perform async refreshing. Instead it does a full page postback.
[Code]....
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May 11, 2010
i'm using asp.net 2.0 form with ajax. i have an ihhtpmodule which can thrown an exception at Application_EndRequest step. my problem is that if this happen in an async postback (i mean a postback of an update panel) i can't manage the exception (with manage i mean set a custom error message server-side) becouse it's too late for the error handler of the ScriptManager.
(the alert will print a message as:
Sys.WebForms.PageRequestManagerParserErrorException: The message received from the server could not be parsed. Common causes for this error are when the response is modified by calls to Response.Write(), response filters, HttpModules, or server trace is enabled.
Details: Error parsing near 'MyButt" />
|<html>
<head>)
at the moment my idea is to clear the response in the module and find a way to use the scriptmanager to send the correctly response of an error/exception. it's this possible? or samebody has another option of how to manage this case? note:i can't edit the aspx to manage this client client side with custom javascript
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Jun 23, 2010
I'm trying to combine nested listviews, updatepanel and asyncfileupload, but have run into some problems. I'm having a main listview listing some projects, and in each project I have a nested listview listing some images in that project. I also have an insertitemtemplate, for inserting new images. This template contains an asyncfileupload control. Everthing is contained in one large UpdatePanel, to enable smooth editing of the images and their associated information.
Problem 1:
The fileupload is complete now, and the file uploads as I expect. In the AsyncUploadCompleted event I'm also inserting the uploaded image to the database. So far so good. But when the upload is done, I want to be able to see the newly updated record in my nested listview. But this is not the case. I'm not able to DataBind the listview in the AsyncUploadCompleted, because that throws an exception saying "The control collection cannot be modified....". So, how do I manage to do an async update of the nested listview, showing the new record?
Problem 2:
When deleting items from my nested listview, after the async update the listview shows up without any items except the InsertItem. The items are not removed, a refresh of the page brings them back. Why is the databinding lost during the async postback?
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Feb 26, 2011
i am using vs 2010
i want to use AsyncFileUpload Control in my web application
i choosen nor web application template in vs 2010
and i added reference to the ajax tool kit dll
and when i choose any file from async file upload control i got the exception unhandled exception..
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Jan 11, 2010
In our application we have a scenario where we need to display a panel using modalpopupextender after performing an async call on the server. We were using the Show method for displaying the popup. It used to work fine without any async call. But when an async call was introduced during the request processing the popup is not getting displayed.
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