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).
Related
I have a ModalPopupExtender on one my pages which I am using to render a form to the user, the form contains several fields including a DropDownList with its AutoPostBack property set to true. When the user changes the selected item in the DropDownList POSTBACK occurs and then the modal popup is automatically closed. If I reopen the popup at this point the correct partial updates have been applied, but I do not want the popup to close itself. Because of how the page is constructed (the content of the modal popup is a user control) I can't simply tell the page to redisplay the popup after the SelectedIndexChanged event of the DropDownList. Is there any way to prevent the popup from closing itself?
ModalPopupExtender1.Show();
Use this in the drop down list selected index changed event in code behind
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 am trying to get data from a data grid and display it into a modal panel. Then modify data in modal panel and after the panel was closed using the "ok action" the modified data to be displayed again in data grid.
This seems to be like a true horror... i do not want to post some code because is really a lot.
The first problem was that the button which opens the modal panel does not call its code behind on server so i do not know how to populate the fields from modal panel with the ones from data grid.
And the second was that the "ok" and "cancel" buttons from modal panel also does not call any code behind from server... so i could not update the data grid with new modified values from modal panel.
Please if you know some tutorials about this, or have an idea how to enable those calls on server side, give me a hand, i seek some but all of them seems to be only for "educative" purposes.
Thanks !
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.
Here is what I am trying to do. I have a page with two link buttons and an updatepanel (the two linkbuttons trigger the updatepanel). I have two usercontrols which have labels with same ID's. When I click the first link button, I add the first usercontrol to the updatepanel and set the label value to datetime.now
when i click the second link button i add the second usercontrol but i see that the value of the label from the first control is set in the label in second user control. if the id's are different there is no problem - but in my case the usercontrols are being developed by different teams and I am integrating them in the way i mentioned - so they may have same ids.
i have browsed all over and tried various suggestions but i cannot get this to work, any help will be greatly appreciated.
Thanks
Job Samuel
Your problem has nothing to do with the UpdatePanel, actually.
Imagine what would happen if you had a 3rd LinkButton, which did nothing but postback. What would happen if you clicked the 1st LinkButton, the UserControl appeared, and then you clicked the 3rd one? What do you expect to see? If you think you will see the UserControl again, you are wrong. Dynamically created controls must be created every request, they don't stick around automatically. ViewState remembers the state of controls on the page, NOT what the controls themselves are in the first place -- thats what the markup in the aspx page does. Dynamically created controls obviously arent in the markup, so they arent automatically recreated.
You need to think of the lifecycle of a control as 'straddling' half way between two requests. It starts half way into one request and ends half way into the next. You need to save which user control is currently displayed in either a hidden field or a Page.ViewState value (not the user control itself mind you, just whatever information you need to figure it out), then reload that control from the page's OnLoad. If you do that -- the sequence will go like this:
(1) Click LinkButton1
(2) UserControl1 dynamically created
(3) Click LinkButton2
(4) Page.OnLoad reloads UserControl1
(5) UserControl1 loads its postback data and viewstate
(6) LinkButton2's click event fires
(7) Remove existing UserControl1 and add UserControl2 dynamically
(8) UserControl2 can have the same ID, since UserControl1 already 'consumed' its state.
I suggest you browse my series of articles on Understanding Dynamic Controls in ASP.NET:
http://weblogs.asp.net/infinitiesloop/
You have to set a different id for the label when you create the user control.