I'm using UpdatePanels in ContentPages sucefully, but now i'm trying to use one UpdatePanel in a MasterPage with an timer (i've setted the UpdateMode to conditional because the Timer) and i'm getting an problem: the update is refreshing the entire page (not like Ajax used in ContenPages).
It's because i'm using the UpdatePanel in the MasterPage?
Make sure the Timer sits within the UpdatePanel and not outside it or surround the Timer with another UpdatePanel. Also, you should check out the link medusa posted which covers some important points.
Are you setting up any triggers to point to the timer? Or where is the timer in relation to the update panel?
Related
I have a problem with expanding/collapsing a Treeview control in an Updatepanel which causes weird behavior and functions fine if placed outside the Updatepanel.
I have found that TreeViews is not supported in updatePanels so my question is:
What is a workaround to avoid a full postback whilst keeping expand/collapse functionality as well as TreeNode_clicks that updates another control?
Also why does it seem that some people use a TreeView inside an Updatepanel with success? Is this only an ASP2 prolbem?
It's the loading of the treeview javascript that fails under an updatepanel. I've tried putting some explanations and options below in bullet points.
The control will work in an updatepanel if it is visible straight away.
The control will not work in an updatepanel if it is made visible after a postback.
If you disable the client side javascript, the control will work in an updatepanel but will cause a postback every time a plus/minus is clicked.
Hope that helps
TreeView in .Net 2.0 doesn't need to postback on expand/collapse.
Have you tried to put an UpdatePanel around the control you wish to update with a trigger
< asp:PostBackTrigger ControlID="treeView" />
As declared by Microsoft, treeview is not compatible with UpdatePanel. So you are having all the issues. I have managed the same to a quite acceptable level in one of my project. You can refer to the posts on the same as follows: http://www.geekays.net/post/Using-TreeView-inside-AJAX-UpdatePanel.aspx and http://www.geekays.net/post/TreeView-control-postbacks-on-check-and-uncheck-of-the-nodes-Checkbox.aspx
Let me know if it helps.
I have an update panel that contains a repeater that calls a user control into each row. When I click a button inside the user control, the page does not refresh at all, only when I reload it completely. How can I make the update panel refresh from user control's button click?
Phairoh is correct that your button needs to successfully cause a PostBack.
There are three things that affect when a UpdatePanel is updated:
The UpdateMode property - This takes two possible values, Always and Conditional.
If it is set to Always then any postback o the page will cause the UpdatePanel to update.
If it is set to Conditional then the UpdatePanel is only updated when the UpdatePanel's Update method is called or when one of the UpdatePanel's triggers does a postback.
The Triggers proroperty - Defines which controls will cause the UpdatePanel to be updated when UpdateMode is set to Conditional.
The ChildrenAsTriggers property - This is a boolean value that determines if child controls of the UpdatePanel are automatically considered triggers without having to be added to the Triggers collection.
Because your button is in a UserControl it won't be easy to add the control to the Triggers collection or to have the button call the Update method on the UpdatePanel that is not inside the UserControl.
Because your UpdatePanel contains the UserControl's your best bet is to enable ChildrenAsTriggers. If this doesn't work try setting the UpdateMode property to Always. If this still doesn't work then Phairoh is probably correct and your Button isn't posting back.
Sometimes solving this problem not really convenient with Triggers. So here is another fancy approach which could be used even from your user controls without any knowledge about Update Panel:
var scriptManager = ScriptManager.GetCurrent(Page);
if (scriptManager != null)
scriptManager.RegisterPostBackControl(SomeControlID);
Are you sure your buttons on your user control are attempting to do a postback? I haven't used update panels in a while (and I'd actually recommend avoiding them) but if I recall correctly they will refresh whenever a postback is done within them. This means that your buttons must be Asp:Buttons (or similar controls that cause postback) and not have some kind of javascript on them that would not allow their action to continue (such as a return false).
I have an Panel control that I need to maintain position across postbacks. I am able to do this by maintaining a cookie which is read each time the page is loaded to get the position of the Panel before the page is loaded.
The problem is, the page is loaded, then repositioned which causes this brief flash where the control is at its default location and jumps to the location it was at prior to postback.
Is there a way to prevent this? I want the control to move to its position first, THEN have it displayed to prevent this "flash".
*edit: I am adding a DragPanel ajax control extender to reposition this. I have a pageLoad that is called and the Panel is repositioned after pageLoad is called. There's gotta be a really simple solution to this.
Could you register the function that positions the panel in the pageLoad event of the ASP.NET client-side library?
This link may be helpful: ASP.NET AJAX Client Life-Cycle Events
Because you're storing the panel's location in a cookie, you could update the panel's location during the server side postback event.
Since you already have code to reposition the panel during pageLoad, you can add code on server side to hide the panel when IsPostback.
On pageLoad, you'll need to add step to set panel.style.display='' after panel after reposition.
Yes, it sounds crazy....It might be.
The final updatepanel does not appear to trigger anything, it just refreshes the update panels and does not call back to the usercontrol hosting it.
Any ideas?
EDIT: I got it posting back, however the controls inside the final usercontrol have lost their data...I'm thinking its because the main repeater is rebinding on each postback...Not sure where to take this one now.
I would suggest you start by removing the UpdatePanels at first, and make sure your control orgy is working correctly with postbacks. Once you have that working, try adding the UpdatePanels back in from the bottom up.
If you set the UpdateMode property to Conditional (default is Always) on both UpdatePanels it should stop the outer UpdatePanel triggering when only the usercontrols updatepanel should have refreshed.
I've got a web application working using VB and Ajax. I'm using updatepanels to avoid the irritating "flicker" on postbacks to the server.
I would like to have a button control defined within the updatepanel itself (tried moving it outside and got some catastrophic error, so left it there) that makes the current panel not visible and a sibling panel visible. This works with the exception that the button must be clicked twice. Not double clicked, but clicked once than clicked again.
In setting breakpoints I discovered the code behind that's attached to the button is actually being executed on the first click, but the panels don't switch as expected. If I click the same button OR worse yet, a different button, the expected behavior of the second panel appearing occurs. However, with the second button being clicked there's an unwanted bonus of a third panel being displayed, the third panel being made visible due to the second button being clicked.
I'm assuming this behavior is due to the updatepanel and its Ajax nature. Is there a way to avoid the second click? Am I misusing the updatepanel? I really wanted to use a modal popup (right out of the AjaxToolKit) but had problems with posting back the data so I opted for this approach. Any insights, assistance, even criticism would be welcome as this has plagued me long enough. Thanks
If you get rid of the UpdatePanels do things work as expected with PostBacks? Chances are something in your Page_Load or other event higher up the chain are "resetting" things in some way before it gets to your click event. Could this be the case?
I think your problem is that only the update panel is receiving data from the server after the method executes. The panel your are trying to change is outside of the update panel so it does not know that its properties have changed.
You either need to do a full page postback or have the panel you wish to modify inside the update panel.
I have run into this before and resolved it, I just can't remember how. I will try to find my old code and get back to you. one thought, do you have EnablePartialRendering enabled in your scriptmanager? maybe try wrapping both containers in a third panel.
Your update panel is sitting inside the other panels.
Should that be the other way around? AFAIK only controls within the update panel will get updated in via the AJAX call.
Here's a fairly simple solution. (I was having the same problem this morning.)
The UpdatePanel can't render stuff outside itself. So, as you noticed, the updates are happening, but you're not seeing the result.
The easiest solution is to force a full postback. You can do that like this:
protected override void OnInit(EventArgs e)
{
var scriptManager = ScriptManager.GetCurrent(this);
// or this.Page in a UserControl, etc.
scriptManager.RegisterPostBackControl(someButton);
scriptManager.RegisterPostBackControl(someOtherButton);
// etc. for each control that needs to update something outside the UpdatePanel
}
This still allows the buttons themselves to be updated in the UpdatePanel by Ajax (e.g. changing their state to disabled or enabled). The full postback only happens if the buttons are clicked.
Like others have said an update panel only updates its contents, thats one of the main benefits of using it.
Panel2 and pnlPrvCmt need to be inside your update panel for your button click method to work. Another option would be to put Panel2 inside one update panel and pnlPrvCmt inside a second update panel. Then any control inside either update panel will cause both to refresh, as long as the UpdateMode=Always (which it is by default).
Try giving the dynamic control an ID when it is created. For some reason this is required by .net for a dynamic control to work in this context.
myControl.id="newID"
I have found this to occur under 2 different scenerios:
No ID set on the control. Either the ID is left off of the markup or the the ID was not set when a dynamic control was created. ASP.Net uses the ID to track actions.
Nested UpdatePanels. Scenerio: When using a Masterpage, you might have a content placeholder that you wrap in an UpdatePanel so that an UpdatePanel is not needed in the content on the page. Then, in developing your page you might, as a habit, add an UpdatePanel.