I have an repeater in an update panel. The repeater has a button and a grid. At runtime, there would be as many as 4 buttons to 4 grids. When button is clicked, data will be bound to the grid associated with it. I want the partial postback on the grids so that if I click one button and data is bound to grid1, if I click another button to bind grid2, I don't want to lose the data already bound to grid1.
I understand controls inside update panel causes a partial page update. But I get an error when I click on the dynamic buttons (similar to the error below).
I get an error if I try to register the button as ScriptManager.GetCurrent(Page).RegisterAsyncPostBackControl:
Error: 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 'SessionSession342066'.
but I don't get an error if I register the button as ScriptManager.GetCurrent(Page).RegisterPostBackControl. However, the latter will do a full postback of the entire repeater.
Because the id's are dynamic, I can't seem to add them to the <Triggers>...
Any suggestions?
Couldn't you abandon the use of the updatepanel and use pure jQuery with web methods instead? In that way, you could update any portion of the repeater at will without a postback.
Related
I have created one form. In that form, after clicking on button shows data in grid.This is working properly, no problem. When I am writing Response.Write(), inside the function to find out the sql query, getting this error. I used update panel, inside that put button and gridview.
Response.write can't be use in updatepanel .
use label or span to show data
Refer : http://www.jnouel.net/post/2009/07/06/ResponseWrite-and-UpdatePanel.aspx
http://www.dotnetpete.com/post/2008/09/18/ResponseWrite-within-an-update-panel.aspx
In an ASP.NET 2.0 project, I've got a form that's used to edit a rather complicated data type. The form is largely contained in an UpdatePanel, because sections of the form appear and disappear based on selections in dropdowns and radio buttons. The Save and Cancel buttons are not in the UpdatePanel.
I've designed it so that on Page_Load I deserialize the object I'm editing from ViewState and update its properties from the controls on the page. Then in OnPreRender I update the controls with new visibility/values based on the object's properties, and serialize the object back into ViewState.
I'm having a problem where I can consistently get this error briefly:
Sys.WebForms.PageRequestManagerServerErrorException: An unknown error
occurred while processing the request on the server. The status code
returned from the server was: 0
There is a panel on the page that appears/disappears based on a selection in a dropdown above it. The dropdown has AutoPostBack set to True, but it has no event handler attached; it causes a postback, which means the object is edited in Page_Load, and the panel's visibility is updated in OnPreRender based on the object's new state. Also, the dropdown is the default focused control when the page loads.
The repro steps are as follows:
Open an object for editing
Without clicking anything, press a key on the keyboard to change the dropdown's value.
Changing the dropdown with the mouse causes a partial postback and updates the panel's visibility. Changing with the keyboard doesn't do anything until focus leaves the dropdown.
Click the Save button. The error appears briefly, then the page refreshes and the object is saved successfully.
As noted, the dropdown doesn't post back until it loses focus after being changed with the keyboard. I think what's happening is that clicking the save button changes focus from the dropdown and starts the postback from the dropdown at the same time as the postback from the Save button. This is why the error comes up.
So what is the best solution? I could make that control not be the default focus, but it's still possible to make the error happen through creative use of the tab key. Is my overall design here unwise?
UPDATE: This question seems to be the same issue; their solution is to simply hide the error message. Is this wise?
I have a web page that initially loads a drop down list. When an item is selected from the list, a web form is dynamically created during an update panel async postback.
I added watermark extenders to some of the textboxes, but the watermark does not display when the page is first updated. If I focus in and then out of one of the textboxes, the watermark then appears and seems to work fine. From examining the source, I saw that the client side creation of the watermark was being attached to the init event of Sys.Application on the client.
Here's where I'm getting confused.
1. I added a handler to the client side page Sys.Application.initialize event to see if it was called during the life cycle of an async postback. It didn't appear to fire the event.
2. I tried to raise the initialize event by adding a handler to the PageRequestManager End Request method, but the flags that check if the page was already initialized were set, so none of the individual handlers were fired.
3. After 1 & 2, I thought maybe the watermark extender was somehow being lazy loaded when I applied focus to it. So I put the $create statement that is supposed to be executed in the initialize event in the End Request event of the PageRequestManager. The client script threw an error because the watermark extender was apparantly already created.
I'm not sure what the resolution here is, outside of writing my own watermark code. Is this a limitation (will the extender only function correctly if created in the initial request for the page)? And what about the init event? I can't see it firing, but if the extender was already created, it must have???
Any help would be appreciated. Thanks.
The watermark extension gives headaches to others too. I'd suggest taking a look at a jquery watermark plugin http://jquery-watermark.googlecode.com/
I have just create a very basic Dynamic Data web application using Entity Framework, and when I click the edit command from the GridView, to open a Details view, edit some fields, and click the Update link, nothing happens.
My question is what could cause this update to do nothing and are there any tips for diagnosing it?
MORE INFO It seems the EntityDataSource 'hides' exceptions. I have found more than one reason for the update or insert operation not completing, but I had to use a SQL trace and trap the command being sent. Running that command manually gives a quick and visible SQL error. Why this doesn't find its way to my UI is a mystery.
In general, anytime you are debugging or developing a Dynamic Data website, one should goto the Site.master file and set the ScriptManager's attribute EnablePartialRendering to false:
<asp:ScriptManager ID="ScriptManager1" runat="server" EnablePartialRendering="false"/>
This will make exceptions more apparent that otherwise seem to be swept under the rug because of the use of Update Panels that wrap around the DetailsView, FormViews and GridViews on the List/Edit/Insert/Details/ListDetails page templates.
I think the real problem you are running into has something to do with error handling and update panels. When debugging in IE, do you see a little exclamation point in the bottom left of the screen? If so, click on it and you will see the javascript error (Sys.WebForms.PageRequestManagerServerErrorException) that has occured because of the unhandled exception.
For more on this, check out ScottGu's Blog on the topic.
#Aaron's comment: that is too early to capture the errors he is referring to. I think, in this scenario, he wants to handle the Updated event because the EntitydataSource will not actually throw an exception until after it gives this event's handlers a chance to run: (MSDN):
If an error occurs when changes are
persisted to the data source, the
Updated event is raised and the
Exception property of the
EntityDataSourceChangedEventArgs
object is set to the returned
Exception. If you handle the exception
in the Updated event handler, set the
ExceptionHandled property to true.
This prevents the exception from being
raised again. When you specify a value
of false for the ExceptionHandled
property, the EntityDataSource
re-raises the exception.
If I am trying to update data from a DetailsView control I'd mostly rely on code behind techniques. I believe there is an ItemCommand fired when you click on any of the DetailView's standard buttons. So inside of these events you have to figure out which button fired the event and take necessary action.
But since your detailsview sits inside a gridview edit template, I suggest you wire the events manually; incorporate them in your markup manually.
...And the update you click is on the DetailsView and not the gridview; so remember to cancel the gridview's editing mode and rebind the gridview.
Hope this helps !!!
I have a markup for generating a list of clients and contacts info for each client. So, I am using nested list view control controls for displaying this. The outer listview control item template has a Image button, when clicked should open a popup extender so that I can attach new contacts to the client.
The problem is, in popup extender the target control id is set for the Image button above and I am getting a runtime error Unable to find the target control ID. Here is the markup...
Explicitly specifying the server event name in the markup of control event would solve this issue. Also the event should be marked as protected/public.