I have one html file upload control to upload the profile picture and I'm using update panel and AsyncPostBackTrigger trigger. If I use PostBackTrigger then uploading of profile image works but If I use AsyncPostBackTrigger then uploading doesn't work.
Below is my code inline:
<asp:UpdatePanel ID="pnlZerkerBasicProfile" runat="server">
<input type="file" id="myFile" name="myFile" class="file_input_hidden" onchange="javascript:FileUploadSubmit();" style="cursor: pointer;" />
<Triggers>
<asp:AsyncPostBackTrigger ControlID="btnSaveProfilePicture" />
</Triggers>
</asp:UpdatePanel>
Can anyone help?
This is a known issue, a full postback is required for the fileupload control to work within an updatepanel i.e. you can't use a AsyncPostBackTrigger.
Edit: Just saw this is a duplicate of FileUpload Doesn't Work When Nested In UpdatePanel? C#
Related
I have a simple ASP.NET 4.0 web form which has an UpdatePanel with a button and TextBox inside. There is nothing unusual about it (it is not inside a repeater and it is not inside a dynamic control).
Asynchronous postback works fine on my test server which is Windows Server 2003.
However, when I copy to my web hosting company (smarterasp.net, Server 2012) it does a full postback. I tried all of the settings available in the hosting control panel but nothing worked (eg. HTTP compression, Integrated mode, output caching).
Are there any usual causes for why this happens on different servers?
<asp:UpdatePanel ID="panSlug" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<div class="form-group">
<asp:Label ID="lblSlug" runat="server" AssociatedControlID="txtSlug" Text="Slug"></asp:Label>
<div class="input-group">
<asp:TextBox ID="txtSlug" runat="server" CssClass="form-control" MaxLength="100"></asp:TextBox>
<span class="input-group-btn">
<asp:Button ID="btnSlugSuggest" runat="server" CssClass="btn btn-default" OnClick="btnSlugSuggest_Click" Text="Suggest" />
</span>
</div>
<asp:RequiredFieldValidator ID="valSlug" runat="server" ControlToValidate="txtSlug" Display="None" ErrorMessage="Slug is a required field" ValidationGroup="Product"></asp:RequiredFieldValidator>
<p class="help-block">Slug is the URL of the product (no spaces or non alpha numeric characters)</p>
</div>
</ContentTemplate>
</asp:UpdatePanel>
Looking at the output HTML on the local server the button renders as input type button with an onclick event, whereas on the live server it renders as a submit button with no onclick event.
In Developer Tools console two errors are shown: "ASP.NET Ajax client-side framework failed to load" and "Sys is not defined".
It turns out that I had a page route set in global.asax that was preventing the axd files from loading.
I was missing routes.Ignore("{resource}.axd/{*pathInfo}"); from global.asax.
Hopefully this answer will help someone else as another possible solution to problems with UpdatePanels.
Add this to the UpdatePanel:
<Triggers>
<asp:AsyncPostBackTrigger ControlID="btnSlugSuggest" />
</Triggers>
I'm utilizing an ASP file upload control on a web page, and I want it hidden until the user wants to upload a file, so the update panel's visible property is false by default. When the button prompting the file upload is clicked, the upload control shows, and a file can be selected, but when the upload button is clicked, an error shows that the PostedFile property of the upload control show "Object reference not set to an instance of an object", even though a file path is visible in the conrrol. This works if the upload control is never hidden. Here is the source:
<asp:UpdatePanel ID="updUploadTestDoc" runat="server" Visible="false">
<ContentTemplate>
<asp:Panel ID="pnlUploadTestDoc" runat="server" GroupingText="Upload Test
Document">
<asp:Label ID="Label3" runat="server" SkinID="FieldLabel" Text="Select File to Upload : " />  
<asp:FileUpload ID="uplUploadFile" runat="server" />
<br />
<br />
<asp:Button ID="btnUpload" runat="server" text="Upload" SkinID="ConfirmButton" />  
<asp:Button ID="btnCancelUpload" runat="server" Text="Cancel" SkinID="CancelButton" />
</asp:Panel>
</ContentTemplate>
<Triggers>
<asp:PostBackTrigger ControlID="btnUpload" />
</Triggers>
</asp:UpdatePanel>
I've tried hiding/showing updUploadTestDoc, pnlUploadTestDoc and the upload control itself, all with the same results. The VB code where the error occurs is:
strAttachmentPath = pUploadControl.PostedFile.FileName
I'm using VS 2010, framework 4.0. This is my first post here, so let me know if more info is needed. Thanks.
You can't retain/assign value in FileUpload control. This is because of due to browser security reasons. The file submission is possible only on the first submission to server. You can't retain or assign a value to it.
In an UpdatePanel the same thing happens. An Ajax post submission will happen asynchronously and thus the browser won't retain the file. Read this
And the solution is to keep the fileUpload outside the UpdatePanel.
you cant use asp:fileupload inside update panel, it's kinda of issue in asp file upload ,
so get it out of the update panel and it will work perfectly
I have used file upload control of asp.net but I am getting empty string while saving.my code-
<asp:FileUpload ID="fuProductLogo" runat="server" CssClass="file paddBottom5px" />
.cs code is-
if (fuProductLogo.PostedFile != null && fuProductLogo.PostedFile.ContentLength > 0)
{
...
}
but the .PstedFile and .CountLength is coming zero but the same code is working fine in another page.Please help.
There are several things to check here:
as #williem said, remove updatepanel from the form if you are using it
add enctype="application/x-www-form-urlencoded" in the form tag
Please remember to update your post after your code modifications and checks.
If the FileUpload is in an UpdatePanel it will be cleared on each ajax-postback. You can use multiple UpdatePanels around the FileUpload control and keep the FileUpload out of them. Also make sure that the button that triggers the actual upload does a real postback, not an asyncpostback. Do this by adding the button to the PostbackTrigger of it's UpdatePanel or by taking it out of the UpdatePanel.
<asp:FileUpload ID="FileUpload1" runat="server" />
<asp:UpdatePanel ID="UpdatePanel2" runat="server">
<ContentTemplate>
<asp:TextBox ID="TextBox2" runat="server" />
<asp:Button ID="Submit" runat="server" Text="Submit" />
</ContentTemplate>
<Triggers>
<asp:PostBackTrigger ControlID="Submit" />
</Triggers>
</asp:UpdatePanel>
You can also use an AsyncFileUpload control from the Asp.net Ajax Toolkit, it works inside an UpdatePanel but it is a little harder to get this to work.
In my web application, one of my web pages contains an update panel in which I have a text box, a file upload control and a button. When the user selects a file using the file upload control and then clicks the button I am not getting any file from the file upload control. When I place a break point, the file upload control's showing a null value. Can you help me?
It's OK to have the upload control itself inside the UpdatePanel; however, the button you click to start the upload must cause a full postback.
To do this, you could either move the button outside the UpdatePanel, or use <Triggers> to force your button to cause a postback:
<UpdatePanel runat="server">
<ContentTemplate>
...
<asp:Button runat="server" ID="myButton" />
...
</ContentTemplate>
<Triggers>
<asp:PostBackTrigger ControlID="myButton" />
</Triggers>
</UpdatePanel>
I'm trying to display an update progress loading image whenever my update panel does it's Ajax thing. I've looked around at tutorials and it seems really straightforward but I'm having no luck. Here is pretty much what I have...
<div id="panelWrapper">
<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<asp:UpdateProgress ID="TaskUpdateProgress" runat="server" DynamicLayout="False" AssociatedUpdatePanelID="UpdatePanel1" DisplayAfter="0">
<ProgressTemplate>
<asp:Image ImageUrl="~/Images/ajax-loader.gif" Width="16px" Height="16px" runat="server" ID="TaskLoadingImage"/>
</ProgressTemplate>
</asp:UpdateProgress>
<div id="UrlDiv" class="URLNotification">
<asp:Label ID="UrlLabel" runat="server" Text="URL:" AssociatedControlID="Url" />
<asp:HyperLink ID="Url" runat="server" Text="Click "Generate" to create the URL." />
</div>
<br />
<asp:CheckBoxList runat="server" ID="IncludeItems" TextAlign="Right">
<asp:ListItem Selected="True">Include 1</asp:ListItem>
<asp:ListItem Selected="True">Include 2</asp:ListItem>
</asp:CheckBoxList>
<br />
<div id="buttons" style="display:inline;">
<asp:Button ID="Generate" runat="server" OnClicked="Generate_Clicked" Text="Generate" />
<asp:Button ID="Add" runat="server" OnClientClick="add();" Text="Add"/>
</div>
</ContentTemplate>
</asp:UpdatePanel>
I also have some absolute positioning styling in a stylesheet. I've tried a bunch of variations of what you see here and have not found much good information as to what may be the issue. Any ideas? If you need anything else, let me know.
EDIT: The only new information I've found is that...
"In the following scenarios, the UpdateProgress control will not display automatically:
The UpdateProgress control is associated with a specific update panel, but the asynchronous postback results from a control that is not inside that update panel.
The UpdateProgress control is not associated with any UpdatePanel control, and the asynchronous postback does not result from a control that is not inside an UpdatePanel and is not a trigger. For example, the update is performed in code."
I'm pretty confident neither of these fit into my case. All that is happening is the button (which is inside the update panel) is clicked calling some code behind which set's the URL text to be reloaded for the update panel.
I have also the same problem with the UpdateProgressPanel.
I found out that when you have placed an UpdateProgressPanel and associated it to an UpdatePanel, any postback from that UpdatePanel will cause the UpdateProgressPanel to show.
Another trick to do is to remove the AssociatedUpdatePanel parameter if you have a single UpdatePanel on the page, this will cause the UpdateProgressPanel to show every Async PostBack that happens.
UpdateProgressPanel can be placed anywhere in the code, except those areas that have predefined tags on it. It can be placed inside or outside the UpdatePanel and it will show if you have properly placed its CSS, Associated it to an UpdatePanel or just place it there and it will show up if an async postback result happens.
Don't put the update progress control inside the update panel control
Make sure the UpdateProgress 'DisplayAfter' is set up to 1000 (1 sec)
I guess I figured out what was going on. The issue wasn't with anything I was doing wrong with the UpdateProgress or Panel. It was that I had other stuff loading in the background that was apparently holding up the UpdatePanel's Ajaxyness.
So basically what happened was that the loading icon wouldn't show up on the initial page load. I realized this because I actually waited till after everything on the page was completely loaded to fire off the button. Sure enough the loader showed up.
I assumed that the update panel refresh would at least be requested the instant the click event was heard so the loader icon would immediately show during the time other stuff is loading. This doesn't appear to be the case though...
I was having really hard time after converting my project from VS2008 to VS2010. The UpdateProgress stopped working suddenly, which was fine in VS2008. Spending a whole afternoon to search the answer and experimenting this and that, finally I found what went wrong from Scott Gu's posting.
It was an automatically generated web.config entry 'xhtmlConformance mode="Legacy"'.
After disabling this, it started to work again. May be not the case for you but just for guys struggling with the same problem.
Happy coding
I also had a problem with the UpdateProgress not showing. Turned out the postback to the server was actually so fast it never had time to show. Adding a Thread.Sleep(10000) helped show the problem.
Create a new ASP.NET Ajax-Enabled Web Site and then paste these code in ascs and aspx file. Run it and you can see the update progress. You can use animated gif files too to show the progress...
ascx Page:
<%# Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title>UpdateProgress control</title>
</head>
<body>
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server" />
<asp:UpdateProgress runat="server" id="PageUpdateProgress" AssociatedUpdatePanelID="Panel">
<ProgressTemplate>
Loading...
</ProgressTemplate>
</asp:UpdateProgress>
<asp:UpdatePanel runat="server" id="Panel">
<ContentTemplate>
<asp:Button runat="server" ID="UpdateButton" OnClick="UpdateButton_Click" Text="Update" />
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="UpdateButton" EventName="Click" />
</Triggers>
</asp:UpdatePanel>
</form>
</body>
</html>
aspx Page:
protected void UpdateButton_Click(object sender, EventArgs e)
{
System.Threading.Thread.Sleep(5000);
}