In our application of asp.net with c#, we are using Ajax with update panel control.
In panel, we have put export to excel button inside tab panel.
We have also put triggers after ending of content template. Please find below code for your reference.
<asp:UpdatePanel ID="UpdatePanelPage" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<table id="tblMain" runat="server" cellpadding="0" cellspacing="0" width="100%">
<tr>
<td>
<asp:TabContainer ID="TabContainer1" runat="server" Width="100%">
<asp:TabPanel ID="tabCompanyName" runat="server">
<asp:Button ID="btnStateExportToExcel" runat="server" Text="Export To Excel" CssClass="button" OnClick="btnStateExportToExcel_Click" />
</asp:TabPanel>
</asp:TabContainer>
</td>
</tr>
</table>
</ContentTemplate>
<Triggers>
<asp:PostBackTrigger ControlID="btnStateExportToExcel" />
</Triggers>
</asp:UpdatePanel>
Now when we run the page following error would be display.
“A control with ID 'btnStateExportToExcel' could not be found for the trigger in UpdatePanel 'UpdatePanelPage'.“
Any idea/suggestion would be highly appreciable.
*As per search results of Google, the button resides in tab panel due to which page was not able to find this control.
Your button are located inside other controls. You should specify namingcontainer hierarchy for update panel trigger. I think this helps you:
<asp:PostBackTrigger ControlID="TabContainer1$tabCompanyName$btnStateExportToExcel" />
I have an ASP.Net page with a long, time-consuming function. I want it to show the "LOADING" word while computing, and show the results when it's done. Here's the code:
<asp:UpdatePanel UpdateMode="Always" runat="server" ID="upanel1">
<ContentTemplate>
<asp:Button ID="btnGetInfo" runat="server" Text="Lekérés" OnClick="btnGetInfo_Click" />
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="btnGetInfo" EventName="Click" />
</Triggers>
</asp:UpdatePanel>
</div>
<asp:UpdateProgress ID="UpdateProgress1" runat="server" AssociatedUpdatePanelID="upanel1">
<ProgressTemplate>
<div>
LOADING</div>
</ProgressTemplate>
</asp:UpdateProgress>
It's almost working(I can see "LOADING" and after the btnGetInfo_Click function ended, "LOADING" disapperrs). I just need a PostBack when it's done.
I've found some similar problem, but the solutions didn't help me.
Thank You for the answers!
What is occurring when you click btnGetInfo is a partial page postback, which refreshes content inside the UpdatePanel ContentTemplate. The reason your GridView is not updating when you call DataBind() is because it is not inside the UpdatePanel ContentTemplate.
Triggering a full-page postback defeats the purpose of an UpdatePanel. I recommend that you put your GridView inside the ContentTemplate to fix the problem.
Our problem/question revolves around an upload control that loses the selected file (goes blank) when a postback control is used (in this case, the dropdown list posts). Any insight into what we are doing wrong or how we can fix this? Below is our code and a summary of the problem.
Any help would be greatly appreciated.
Thank you!
<asp:updatepanel id="UpdatePanel1" runat="server">
<ContentTemplate>
<div class="row">
<asp:DropDownList runat="server" AutoPostBack="true" ID="CategorySelection" OnSelectedIndexChanged="CategorySelection_IndexChanged" CssClass="drop-down-list" />
</div>
<div id="SubCategory" class="row" runat="server" visible="false">
<asp:DropDownList runat="server" ID="SubCategorySelection" CssClass="drop-down-list" />
</div>
<div class="row">
<asp:FileUpload runat="server" ID="FileUpload" CssClass="file-upload" />
</div>
<div class="row">
<asp:Button ID="submit" runat="server" Text="Submit" CssClass="button" OnClick="submit_ButtonClick" />
</div>
</ContentTemplate>
<Triggers>
<asp:PostBackTrigger ControlID="submit" />
</Triggers>
</asp:updatepanel>
In this form we have 2 DropDownList, 1 FileUpload and 1 submit button. Every time that the user selects one category, the subcategories are loaded (AutoPostBack=”true”).
The primary user flow works fine: User selects one category, subcategory and selects a file to be uploaded (submitted). HOWEVER, if the user selects a file first, and then selects a category, the screen will do a partial refresh and the selected file will disappear (field goes blank). As a result, the user needs to select the file again. This causes an issue because the fact that the file is no longer selected can easily be overlooked.
Seems straighforward --- but causing us a lot of grief. Any experts out there that can help?
BIG thanks!
That is the behavior of the input type=file i.e. it can't be pre-populated. Move the FileUpload outside of the UpdatePanel. In your markup, you could move both FileUpload and the submit Button outside of the UpdatePanel.
I have a page with Ajax Tab controls, within one of the tabs is a webcontrol that as a Telerik RadGrid, with Edit forms pointing to another web control. That edit form also contains Ajax Tabs and on one of those tabs, there is an Ajax modal popup of yet another webcontrol.
The initial webcontrol works fine when used on its own page, but the edit form fails to appear when the control is used within the Ajax Tabs as desired. The script manager is throwing the following error:
Microsoft JScript runtime error: Sys.InvalidOperationException: Could not find UpdatePanel with ID 'xxx'. If it is being updated dynamically then it must be inside another UpdatePanel.
Any assistance with this would be appreciated.
This issue occurs in Telerik RadAjaxManager when you adds invisible controls to it.
So in case of your in need to show/hide AJAX controls, it is recommended to add AJAX settings grammatically from you code behind (based on control visibility state) instead of ASPX code.
For more information: Please check this answer on the Telerik forums.
Well, I am considering this error is coming in your script. If you are showing/hiding the update panel then it will give this error. The best solution is known to me which worked too is put your update panel into the content template of the other update panel which will be the parent of the update panel that you are showing/hiding.
<asp:UpdatePanel ID="Panel1" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<asp:UpdatePanel ID="Panel2" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<asp:Label ID="labwl1" runat="server" Text="Label">
</asp:Label>
</ContentTemplate>
</asp:UpdatePanel >
</ContentTemplate>
</asp:UpdatePanel >
Now if you will hide the update panel with id Panel2 it won't give any error.
In most of the cases - If container/Parent of that update panel is trRow
and you have somewhere in code like trRow.Visible = false; then It wont find said updatepanel and throw error.
To start off with the troubleshooting, I personally will try to remove parts of the code and thus designate the reason for the error. For example, remove the grid and load the user control dynamically on tab click to see if the problem remains, then remove the inner ajax tab or the modal popup and perform another check, etc.
That is correct, I've wasted 2 hrs to find out why all of the sudden my code stopped working...
turned out I've been a bit cleaning a bit too much of my rem'ed code out and removed a closing in my update panel...
<asp:UpdatePanel ID="submitupdatepanel" runat="server">
<ContentTemplate>
<div class="block" style="height: 60px; width: 400px;">
<div class="centered">
<asp:LinkButton ID="submitbutton" runat="server" CssClass="button_red2 " Text=" <span>Submit </span>">
</asp:LinkButton>
<asp:LinkButton ID="cancelbutton" runat="server" CssClass="button_gray2 " Text=" <span>Cancel</span>" Visible="false" OnClientClick="window.close()">
</asp:LinkButton>
</div>
</ContentTemplate>
</asp:UpdatePanel>
<br />
<div style='display: none'>
<asp:UpdatePanel runat="server">
<ContentTemplate>
<asp:PlaceHolder ID="myhiddenpopups2" runat="server" Visible="true"></asp:PlaceHolder>
</ContentTemplate>
</asp:UpdatePanel>
</div>
which then gave this same error on the hidden updatepanel part below it.
After i put the missing back in, al went back to normal status
<asp:UpdatePanel ID="submitupdatepanel" runat="server">
<ContentTemplate>
<div class="block" style="height: 60px; width: 400px;">
<div class="centered">
<asp:LinkButton ID="submitbutton" runat="server" CssClass="button_red2 " Text=" <span>Submit </span>">
</asp:LinkButton>
<asp:LinkButton ID="cancelbutton" runat="server" CssClass="button_gray2 " Text=" <span>Cancel</span>" Visible="false" OnClientClick="window.close()">
</asp:LinkButton>
</div>
</div>
</ContentTemplate>
</asp:UpdatePanel>
<br />
<div style='display: none'>
<asp:UpdatePanel runat="server">
<ContentTemplate>
<asp:PlaceHolder ID="myhiddenpopups2" runat="server" Visible="true"></asp:PlaceHolder>
</ContentTemplate>
</asp:UpdatePanel>
</div>
Hope it helps for someone.
K
I resolved the issue by removing the UpdatePanel on the initial tab that contained the WebControl. I'm not clear on why this should have caused the issue though so if anyone can explain that, I'd be interested to find out.
So, for example, I originally had this:
<cc1:TabContainer ID="TabContainer1" runat="server" ActiveTabIndex="0" OnClientActiveTabChanged="TabContainer1_OnChanged" Visible="true" >
<cc1:TabPanel runat="server" ID="TabPriorities">
<HeaderTemplate>Manage Prioritys</HeaderTemplate>
<ContentTemplate>
<asp:UpdatePanel ID="UpdatePanelPriorities" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<uc1:PriorityGrid ID="PriorityGrid1" runat="server" />
</ContentTemplate>
</asp:UpdatePanel>
</ContentTemplate>
</cc1:TabPanel>
And I changed it to:
<cc1:TabContainer ID="TabContainer1" runat="server" ActiveTabIndex="0" OnClientActiveTabChanged="TabContainer1_OnChanged" Visible="true" >
<cc1:TabPanel runat="server" ID="TabPriorities">
<HeaderTemplate>Manage Prioritys</HeaderTemplate>
<ContentTemplate>
<uc1:PriorityGrid ID="PriorityGrid1" runat="server" />
</ContentTemplate>
</cc1:TabPanel>
And that resolved the script error coming out of the user control which also contained ajax tabs and a modal popup.
This can be caused by unclosed tag or missing end tag.
In my case I had 2 update panels on the page, but only 1 of them had an ID. Setting an ID for the other one resolved the error.
My page contains a few updatepanels. I fixed this error by making sure all of them were visible and didn't have display:none.
You can find which panel is causing the error by viewing the source of the page and searching for the ID the error is giving you.
EDIT: I'd like to revise my answer based on some new things I discovered while working with update panels in UpdateMode="Conditional".
This is still in context of addressing the OP's issue of encountering the above error.
The scenario for me is that I have a parent update panel with several nested child update panels:
<asp:UpdatePanel ID="upParent" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<%-- Header Content --%>
<asp:UpdatePanel ID="upChild1" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<%-- Child1 Content --%>
</ContentTemplate>
</asp:UpdatePanel>
<asp:UpdatePanel ID="upChild2" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<%-- Child2 Content --%>
</ContentTemplate>
</asp:UpdatePanel>
<asp:Button ID="btnEditMode" runat="server" Text="Edit" OnClick="btnEditMode_Click"></asp:Button>
</ContentTemplate>
</asp:UpdatePanel>
In order for the Edit button to change content in both child update panels and also refresh the overall Parent update panel without causing any issues, you might want to consider doing an asynchronous postback:
<asp:UpdatePanel ID="upParent" runat="server" UpdateMode="Conditional">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="btnEditMode" EventName="Click" />
</Triggers>
<ContentTemplate>
<%-- Header Content --%>
<asp:UpdatePanel ID="upChild1" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<%-- Child1 Content --%>
</ContentTemplate>
</asp:UpdatePanel>
<asp:UpdatePanel ID="upChild2" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<%-- Child2 Content --%>
</ContentTemplate>
</asp:UpdatePanel>
<asp:Button ID="btnEditMode" runat="server" Text="Edit" OnClick="btnEditMode_Click"></asp:Button>
</ContentTemplate>
</asp:UpdatePanel>
This works for me, I don't get the above mentioned (OP's) error any longer.
Interestingly enough, almost similar to the OP's scenario, I've been working with Ajax Tab Controls and each tab contained child update panels. This is where I've encountered the exact same error message and resolved it by adding the asynchronous post back trigger.
I have a strange problem on an aspx page. In short, I have 3 radio buttons and a table on the page. When the user activates the middle radio button two text boxes and a button is shown to the user. The button serves as a way to post back the page. Anyway, the postback should be only a partial postback. Everything works fine in IE but in Firefox I found out that if I click outside of the two text boxes and then hit the refresh button, the whole page is posted back instead of a partial postback. If I select a date from the two text boxes and don't get the cursor out of one of the text boxes and then hit the button, only a partial post back is performed, which is what I want. The question is, how could I resolve this issue with Firefox ?
The page basically looks like this:
<asp:RadioButtonList>
<asp:ListItem Value="1" />
<asp:ListItem Value="2" />
<asp:ListItem Value="3" />
<asp:RadioButtonList>
<div>
...
<asp:TextBox />
...
<asp:TextBox />
...
<asp:Button ID="refreshButton" />
</div>
...
<asp:UpdatePanel>
<ContentTemplate>
<GridView ... />
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger
ControlID="filterRBL"
EventName="SelectedIndexChanged" />
<asp:AsyncPostBackTrigger
ControlID="numberOfRecordsPerPageDDL"
EventName="SelectedIndexChanged" />
<asp:AsyncPostBackTrigger
ControlID="refreshButton"
EventName="Click" />
</Triggers>
</asp:UpdatePanel>
Thanks in advance.
You may need to put the group of controls into a <asp:Panel> tag and/or change the UpdateMode="Conditional" on your UpdatePanel tag