I am dynamically adding Accordian Panes to an Ajax Accordion. On PostBack i cannot access the dynamically created Accordian Panes and ACC.Panes.Count=0
if the panes are not dynamically created everything works fine. so i think that is has to do with the DOM while creating the panes from code behind.
is there any workaround for my case?
is there any better control similar to Ajax Accordion?
You should redraw the accordion on the Page_Init event on each post back in order to be able to access them after the post back.
All dynamic-generated controls are lost on postback, that's why you must re-define them in your page's Init event, then they will be available always.
Related
I have one requirement like,
One master page with three image buttons, once clicking on any button it redirect's to appropriate page, in that page(it's requester form) i have placed all controls in one panel control(id="MyPanel"), one link button(MyLinkButton) out side to that panel and one modal popup control(id=MyModalpopup) as target control id=MyLinkButton,popupcontrolid=MyPanel. On this page load i did code (MyModalpopup.show()) to show all controls in modal popup.
every thing is working fine but, i have controls like dropdown,checkboxlist with autopostback=true and these are in updatepanel and for these controls i am binding data from code behind. Now the problem here is the data i am unable to bind and when these controls are postback the modal popup is not visible.
i am using C# and 3.5 framework.
What I would do, is have a hidden field (with runat=server) that has a true/false value that is set when the modal is activated/hidden.
Then during the client-side page-load of the postback, read that value and make the modal hidden/shown appropriately.
The other option would be to figure out how to make those controls work without the auto-postback (i.e. populating the controls via ajax).
I have a master page where an update panel contains the main placeholder of the content pages.
Inside one of the content pages I need to disable the update panel in any way since I have a form with asp:fileupload control that is always returning null due to the update panel.
How can I overcome this issue?
Place your fileuploader and submit button in another update panel and add a post back trigger for this update panel.
On page load of content page, try to get the update panel of master page using FindControl method and then attach your file upload as a post pack trigger to it dynamically.
That may work
I've got a bad news for you.!
Have a look at this
http://ajax.asp.net/docs/overview/UpdatePanelOverview.aspx
The following ASP.NET controls are not compatible with partial-page updates, and are therefore not supported inside an UpdatePanel control:
TreeView and Menu controls.
Web Parts controls. For more information, see ASP.NET Web Parts Controls.
FileUpload controls when they are used to upload files as part of an asynchronous postback.
GridView and DetailsView controls when their EnableSortingAndPagingCallbacks property is set to true. The default is false.
Login, PasswordRecovery, ChangePassword, and CreateUserWizard controls
whose contents have not been converted to editable templates.
The Substitution control.
Validation controls, which includes the BaseCompareValidator, BaseValidator, CompareValidator, CustomValidator, RangeValidator, RegularExpressionValidator, RequiredFieldValidator, and ValidationSummary control.
Solution :
You may want to use Ajax FileUpload using Jquery in place of update Panel. Remember, Open source is always a better option. :)
I need add paging to panel, which populated with dynamically-created controls.
I want implement paging as several LinkButtons. Populating panel(re/create controls) is executed at Page_Load.
Click on LinkButton and save currentpage is executed after page_Load, so I don't know what I should show(what current page) at Page_Load when build panel with controls.
What should I do for implement this scenario?
Thanks, Andrew
Re/create controls at page_Load is to late. Create the controls at page_Init, otherwise ViewState will not work. Just the Data binding portion of your code belongs to page_Load.
You are right that you shouldn't change the control structure in the LinkButtons event handler. Persist the page state (probably in SessionState) and redirect the page to itself. The next page life cycle, initiated by the redirect, will do the recreation.
I'm adding controls at run-time to the Page Form object.
Each control has an Id.
On postback, I want to be able to access these controls and their values.
Currently, when I do a postback, the form has no controls in the Form.Controls Collection.
How can I rectify this?
Is this only possible if you add the controls to the page every time the page loads?
Dynamically added controls need to be added with every page load or else they will be lost.
However the viewstate of these controls can be maintained as long as they always get added with the same ID.
I believe you have to add the controls dynamically in order to access them on postback. So if you add a textbox dynamically, your event handler can't retrieve its value unless you add it again.
EDIT: One workaround I used was to add a predetermined set of server controls to the page and then use JavaScript to hide/show those elements. You avoid postbacks and you avoid the unnecessary tom-foolery associated with retrieving values from dynamically added server controls. Of course, this limits you to a predefined number of controls.
This was a big pet peeve of mine with ASP.NET web forms and is a factor in my decision to explore ASP.NET MVC - no more viewstate/postback mess.
I have a UserControl which contains voting buttons inside an UpdatePanel, and outside a Repeater, it works perfectly. In the repeater, clicking the button fires off the appropriate event. That event is supposed to update the text of a control within the User Control, and that update should be reflected when the UpdatePanel refreshes.
If tried the UpdatePanel in UpdateMode Always and Conditional (firing the Update event after making the changes to the properties in the _Click method, and the same problem happens both ways.
Is there something about how UpdatePanels behave in Repeaters that I'm missing?
Thanks.
The reason might have nothing to do with the update panel, but with the postback loosing track of your UserControl. Possibly assigning unique IDs to your user controls may help.
Your repeater is building a table correct? The problem is most likely that an update panel generates a div tag and it's probably outside any TR and TD tags so the browser doesn't know what to do with it.
http://www.netortech.com/blog/?articleid=8