How to upload an image when fileupload is under updatepanel?
I have a button say "upload" inside that update panel.
When I click that button inside the button click event I got the fileupload hasfile=false.
Please suggest if there is any way to upload image file when fileupload control is inside update panel and the button is making asyncpostback.
Thanks in advance.
you can use AJAX AsyncFileUpload control
http://www.asp.net/AJAX/AjaxControlToolkit/Samples/AsyncFileUpload/AsyncFileUpload.aspx
Also check this thread.
File uploading in AJAX updatepanel without full postback
It is not possible. For security reasons, the browser does not allow javascript to upload files.
There are two normal workarounds for this problem:
Perform the upload in an iFrame
Use a flash plugin for uploading
I recently applied this tool to upload files asynchronously in my web page, and it works beatifully: http://valums.com/ajax-upload/
It creates an iFrame for you automatically, and posts the frame and and sends the resulting html (or json object) to an event handler. My page that receives the uploaded file, returns a json object describing the file, e.g. filename and a unique id, so that I can link the data that is posted on the main page to the uploaded file.
For security, I store the credentials of the user uploading the file, so when the form is posted I can validate that the user that posts the form is indeed the user that uploaded the file.
I had tried as below. It is working.
<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="conditional">
<ContentTemplate>
<asp:FileUpload ID="FileUpload1" runat="server" />
<asp:Button ID="Upload" runat="server" Text="Upload" OnClick="Upload_Click" /><br />
<asp:Image ID="NormalImage" runat="server" /></ContentTemplate>
<Triggers>
<asp:PostBackTrigger ControlID="Upload" />
</Triggers>
</asp:UpdatePanel>
Reference to
http://www.c-sharpcorner.com/uploadfile/prathore/fileupload-control-in-update-panel-using-Asp-Net-ajax/
You can try this code. I tried it, it's working on my side.
<asp:ScriptManager runat="server" />
<asp:UpdatePanel ID="UpdatePanel1" runat="server" >
<ContentTemplate>
<div>
<asp:FileUpload ID="FileUpload1" runat="server" /> <br/>
<asp:Button ID="btn_Upload" runat="server" Text="Save" OnClick="btn_Upload_Click" /><br />
</div>
</ContentTemplate>
<Triggers>
<asp:PostBackTrigger ControlID="btn_Upload" />
</Triggers>
</asp:UpdatePanel>
Related
I am having one master page that has one update panel.
Content place holder is within the update panel
Now i have child page which has a File upload control
To make work File upload control, i have to put Postback trigger.
But question is where i can put that Postback trigger ??
If i put Postback trigger in Master page than it will give me error that control does not found
and i can't put Postback trigger because child page has not other update panel
What is the solution for this problem ?
Simply wrap the FileUpload with an UpdatePanel, which don't do anything and hasn't any side effect but will solve the problem.
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:FileUpload ID="FileUpload1" runat="server" />
<asp:Button ID="btnSubmit" runat="server" Text="Button" />
</ContentTemplate>
<Triggers>
<asp:PostBackTrigger ControlID="btnSubmit" />
</Triggers>
</asp:UpdatePanel>
I have an AJAX UpdatePanel and a GridView inside it. A FileUpload component outside the updatepanel.
<asp:FileUpload ID="documentUpload" runat="server" />
<asp:Button ID="btnUploadDocumentDetails" runat="server" OnClick="btnUploadDocumentDetails_Click" />
<asp:UpdatePanel ID="UpdatePanel_DocumentDetails" runat="server">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="btnuploaddocumentdetails" EventName="Click" />
</Triggers>
<ContentTemplate>
<asp:GridView ID="gvDocuments" runat="server"></asp:GridView>
</ContentTemplate>
</asp:UpdatePanel>
On button click I have to upload the file on the server and update the GridView (gridview contains the list of all files).
Problem:
When I click on the button to upload the file, the FileUpload component gets empty (HasFile attribute returns false).
How can I resolve this issue to asynchronously update the GridView?
here is my problem : I have an Update Panel with a asp:TextBox inside and an onTextChanged event. During the process, a loader.gif is show thanks to the progress Template.
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:TextBox ID="tboxEmailDegrade" runat="server" CssClass="cadreTexteRediger" MaxLength="250"
AutoPostBack="True" OnTextChanged="tboxEmailDegradeOnTextChanged"></asp:TextBox>
<asp:Image ID="imgVerifEmailFalse" runat="server" ImageUrl="../../Charte/images/Avis/Formulaire/ko.gif"
Visible="false" style="margin-left: 4px"/>
<asp:Image ID="imgVerifEmailTrue" runat="server" ImageUrl="../../Charte/images/check.png"
Visible="false" style="margin-left: 4px"/>
<input id="HidStatutValide" type="hidden" value="0" runat="server" />
<asp:UpdateProgress ID="UpdateProgress1" runat="server">
<ProgressTemplate>
<img class="iconeValdation" runat="server" src="../../Charte/images/ajax-loader.gif" alt="Processing" style="margin-left: 4px; float:left" />
</ProgressTemplate>
</asp:UpdateProgress>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="tboxEmailDegrade" />
</Triggers>
during that process i want to hide another image (in code imgVerifEmailTrue or imgVerifEmailFalse), but obviously the image will be hidden only at the end of the process, after the post back. So i have the loader and another image next to it.
is it possible to do a partial post back to hide the image at the start of the process?
You could do this easily using ASP.NET AJAX JavaScript.
Hide the buttons at Sys.WebForms.PageRequestManager.getInstance().add_beginRequest(beginRequestHandler)
and show them again at Sys.WebForms.PageRequestManager.getInstance().add_endRequest(endRequestHandler) events respectively.
As MSDN notes,
Sys.WebForms.PageRequestManager beginRequest Event
Raised before the processing of an asynchronous postback starts and the postback request is sent to the server.
Sys.WebForms.PageRequestManager endRequest Event
Raised after an asynchronous postback is finished and control has been returned to the browser.
How can i automatically update a user control after a specific time without updating the whole aspx page. I haven't done it before. Any ideas would be appreciated.
i suppose you are using asp.net ajax and it has timer control.
check this example : http://ajax.net-tutorials.com/controls/timer-control/ and this video : http://www.asp.net/ajax/videos/how-do-i-use-the-aspnet-ajax-timer-control .
If you have the AJAX extension installed, you can use an UpdatePanel and the ContentTemplate to only refresh that region of your webpage when performing a Postback. You can put any content here, as a self created Usercontrol.
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server" />
<div>
<asp:Label ID="Label1" runat="Server"></asp:Label>
<br />
<asp:UpdatePanel ID="UpdatePanel1" runat="Server">
<ContentTemplate>
<asp:Label ID="Label2" runat="server"></asp:Label>
<br />
<br />
<asp:Button ID="Button2" runat="server" Text="Click Me Again" OnClick="Button2_Click"/>
</ContentTemplate>
</asp:UpdatePanel>
</div>
</form>
The idea would then be to use a Timer to perform a Postback of that UpdatePanel, as someone else has suggested a link for that.
I'm not really sure what you mean when you say "updating" but if you take a look at the life cycle of an active server page you will see that the whole page will be "refreshed" by the web server.
When the web server responds to a client request the entire content will be transformed to a page displayable by a browser and send to the client.
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:FileUpload onchange="clickTheButton();" ID="FileUpload1" runat="server" />
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="Button1" />
</Triggers>
</asp:UpdatePanel>
Button 1 is outside the update panel and the javascript that gets run when a user adds a file in the upload box is this:
function clickTheButton() {
document.getElementById('<%= Button1.ClientID %>').click();
}
The problem is simple. FileUpload1.HasFile == false. I don't know why this is, but when I put it in the update panel it ceases to work.
I have seen some other threads on this. But none of them answer why this is happening, they just point to things you can download.
EDIT: Really my main reason for wanting to do this is so that I can get a ..Uploading File.. Tag to pop up while the client is uploading to the server and once it has completed, display it in a datalist. I just cant get the UpdateProgress to work.
Basically you just need to make your button do a full postback to send the file. Also make sure that you have this.Form.Enctype = "multipart/form-data"; set in your code, or you can put in that page. AsyncPostbacks don't work with files for security reasons as mentioned, without hacks. (I've never been able to get it to work).
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:FileUpload onchange="clickTheButton();" ID="FileUpload1" runat="server" />
</ContentTemplate>
<Triggers>
<asp:PostBackTrigger ControlID="Button1" />
</Triggers>
</asp:UpdatePanel>
For security purposes, browsers don't let you post files via javascript. Imagine if I could write a little bit a javascript to asynchronously submit the contents of your My Documents folder to my server.
So javascript-ish methods of posting the form, like the XMLHttpRequest used by the UpdatePanel, won't work.
This post describes a decent work around if you're on 3.5 SP1. http://geekswithblogs.net/ranganh/archive/2009/10/01/fileupload-in-updatepanel-asp.net-like-gmail.aspx
And this post describes a couple work arounds if you'd prefer not to use the AjaxControlToolkit. http://geekswithblogs.net/ranganh/archive/2008/04/01/file-upload-in-updatepanel-asp.net-ajax.aspx
File Upload will not work with a partial post back.
So just add this line at your page load
ScriptManager.GetCurrent(this).RegisterPostBackControl(this.YourControlID);
Or use PostBackTrigger.
<Triggers>
<asp:PostBackTrigger ControlID="YourControlID" />
</Triggers>
Or You need special AsyncFileUpload control as defined in AjaxControl Toolkit.
<ajaxToolkit:AsyncFileUpload OnClientUploadError="uploadError"
OnClientUploadComplete="uploadComplete" runat="server"
ID="AsyncFileUpload1" Width="400px" UploaderStyle="Modern"
UploadingBackColor="#CCFFFF" ThrobberID="myThrobber" />
You can check here.