My updatePanel is in MasterPage and FileUpload is in Child Page.
As FileUpload requires a full PagePostBack I tried following approaches, but none of them worked, fileupload.hasfile gives false and postedfile is null. Not sure what else to do. Please go through and suggest. Is there anything that I am missing.
Using .NET Framework 4.0, Bootstrap 4
Approach 1 - Adding Postback trigger through code behind
AddTriggers(btnupload.UniqueID);
public static void AddTriggers(string ControlID)
{
UpdatePanel UP = Page.Master.FindControl("MainUpdPanel") as UpdatePanel;
UpdatePanelControlTrigger trigger = new PostBackTrigger();
trigger.ControlID = ControlID;
UP.Triggers.Add(trigger);
}
Approach 2 - Wrapping fileupload and it's button in a separate UpdatePanel in child Page
<asp:UpdatePanel ID="Upld" runat="server">
<ContentTemplate>
<div class="input-group form-inline">
<asp:FileUpload ID="FileUploadreq" runat="server" />
<asp:Button runat="server" ID="btnupload" Text="Upload" OnClick="btnupload_Click" />
<asp:LinkButton runat="server" Text="View" ID="lnkview" OnClick="lnkview_Click" Visible="False"></asp:LinkButton>
</div>
</ContentTemplate>
<Triggers>
<asp:PostBackTrigger ControlID="btnupload" />
</Triggers>
</asp:UpdatePanel>
Add enctype="multipart/form-data" to the form tag and add the trigger in your page Page_Init function
protected void Page_Init(object sender, EventArgs e)
{
AddTriggers(btnupload.UniqueID);
}
Related
I have a Listbox that exists in an UpdatePanel on an ASP.NET webform. Also inside the UpdatePanel, exists a Button that adds a bunch of ListItem's to the Listbox, this PostBackTrigger as shown below:
<asp:UpdatePanel ID="updSection6" runat="server">
<ContentTemplate>
<asp:LinkButton Text="Run Scan" ID="btnEditSectionStory6" runat="server" OnClick="btnRunScan_Click" />
<br />
<asp:ListBox ID="lbLog" runat="server" Height="263px" Width="747px"></asp:ListBox>
</ContentTemplate>
<Triggers>
<asp:PostBackTrigger ControlID="btnEditSectionStory6" />
</Triggers>
</asp:UpdatePanel>
I add items in the click event:
protected void btnRunScan_Click(object sender, EventArgs e)
{
lbLog.Items.Add("Scan Beginning...");
.....hundreds of other items
}
The items are added to the ListBox, however it is after the entire btnRunScan_Click method is run, rather than adding them as each event occurs (So the user can receive messages as the actions occur). Am I missing an attribute or something on the UpdatePanel?
TIA
To Add Items without refreshing page or prevent from calling the cyclic events use following code and eliminate postBackTrigger inside the Trigger.Use following code that is tested working for me.Also use the scriptManager to prevent from exception over to use the updatePanel
.aspx design file
<asp:ScriptManager runat="server"></asp:ScriptManager>
<asp:UpdatePanel ID="updSection6" runat="server">
<Triggers>
</Triggers>
<ContentTemplate>
<asp:LinkButton Text="Run Scan" ID="btnEditSectionStory6" runat="server" OnClick="btnRunScan_Click" />
<br />
<asp:ListBox ID="lbLog" runat="server" Height="263px" Width="747px"></asp:ListBox>
</ContentTemplate>
</asp:UpdatePanel>
.cs file
protected void btnRunScan_Click(object sender, EventArgs e)
{
lbLog.Items.Add("Scan Beginning...");
}
As other also mention you can also use jquery with ajax to code over the client side to do this one.
I have that example:
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<fieldset>
<legend>UpdatePanel</legend>
<asp:Label ID="Label1" runat="server" Text="Panel created."></asp:Label><br />
</fieldset>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="Button1" />
</Triggers>
</asp:UpdatePanel>
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Button" /></div>
protected void Page_Load(object sender, EventArgs e)
{
// doesn work with:
Response.Write("eg.");
}
protected void Button1_Click(object sender, EventArgs e)
{
Label1.Text = "Refreshed at " + DateTime.Now.ToString();
}
This works fine. When I click in the Button the Label updates without refreshing the page, but if I have Response.Write in the Page_Load event, when I click the button the UpdatePanel doesn't work, and I need the Page_Load.
How I can solve my problem? Thanks.
Don't use Response.Write() in your Page_Load function, as it will break the UpdatePanel.
In fact, using Response.Write() is often a bad idea, because you don't control where in the DOM the written content will end up. Instead, if you need some simple debug output, then use other means such as System.Diagnostics.Debug.WriteLine(). Or if you need to add something to the DOM, add a control such as Label and manipulate that.
Attempting to use a FileUpload or AsyncFileUpload control in an updatepanel on a NET 4.5/C# web application.
I've tried using either standard Scriptmanager or ToolKitScriptManager in my masterpage.
My Save button is set as a PostBackTrigger (tried AsyncPostbackTrigger too).
No matter what, my (Async)FileUpload.HasFile always returns false.
Remove the updatepanel and both uploadcontrols work fine.
What really throws me is that I have this working in another project (scriptmanager in masterpage, Fileupload in updatepanel, SaveButton is PostbackTrigger).
Is there some specific AJAX version or .NET version that can cause problems?
This is extremely frustrating.
Adding the button to the UpdatePanel's trigger tag, I got it working:
<asp:UpdatePanel ID="UpdatePanel" runat="server">
<ContentTemplate>
<asp:FileUpload ID="FileUpload" runat="server" />
<asp:Button ID="btnUpload" runat="server" Text="Upload"
OnClick = "btnUpLoad_OnClick" />
</ContentTemplate>
<Triggers>
<asp:PostBackTrigger ControlID = "btnUpload" />
</Triggers>
</asp:UpdatePanel>
I did not have to do anything different server-side (like user5159158's answer).
In Page_Load add: Page.Form.Attributes.Add("enctype", "multipart/form-data");
File Upload will not work with a partial post back. It requires full page request. So add the below line in your page load.
ScriptManager.GetCurrent(this).RegisterPostBackControl(this.YourControlID);
FileUpload
FileUpload requires full page request. This is a limitation of the XmlHttpRequest component used in all AJAX frameworks for asynchronous calls to the application.
What really throws me is that I have this working in another project
(scriptmanager in masterpage, Fileupload in updatepanel, SaveButton is
PostbackTrigger).
I think you are using Full PostBack, although FileUpload is inside **UpdatePanel.
For example,
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:FileUpload ID="FileUpload1" runat="server" />
<asp:Button ID="SaveButton" runat="server" OnClick="SaveButton_Click"
Text="Upload your file" />
</ContentTemplate>
<Triggers>
<asp:PostBackTrigger ControlID="SaveButton" />
</Triggers>
</asp:UpdatePanel>
AsyncFileUpload
If you use AsyncFileUpload with UpdatePanel, AsyncFileUpload.HasFile should only checked inside UploadedComplete (you cannot check inside Button click event).
The reason is AsyncFileUpload is uploaded the file via Async by itself.
Note: make sure you use ToolkitScriptManager instead of ScriptManager
<ajaxToolkit:ToolkitScriptManager ID="ToolkitScriptManager1" runat="Server" />
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<ajaxToolkit:AsyncFileUpload runat="server" ID="AsyncFileUpload1"
OnUploadedComplete="AsyncFileUpload1_UploadedComplete" />
<asp:TextBox runat="server" ID="TextBox1" /><br/>
<asp:Button ID="SaveButton" runat="server" OnClick="SaveButton_Click"
Text="Save" />
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="SaveButton" />
</Triggers>
</asp:UpdatePanel>
private string FileName
{
get { return (string)(Session["FileName"] ?? ""); }
set { Session["FileName"] = value; }
}
protected void SaveButton_Click(object sender, EventArgs e)
{
string fileName = FileName;
string path = Server.MapPath("~/App_Data/");
var fileInfo = new FileInfo(path + FileName);
}
protected void AsyncFileUpload1_UploadedComplete(object sender,
AsyncFileUploadEventArgs e)
{
if (AsyncFileUpload1.HasFile)
{
FileName = AsyncFileUpload1.FileName;
string path = Server.MapPath("~/App_Data/");
AsyncFileUpload1.SaveAs(path + AsyncFileUpload1.FileName);
}
}
Other Thoughts
I personally do not like using AsyncFileUpload inside UpdatePanel. Instead, I'll rather use Full PostBack if I need to upload a file.
I have a Button which will trigger an UpdatePanel, but it is in a different container so if I put my code like below :
<asp:UpdatePanel ID="uptxtQuickSearch" runat="server" UpdateMode="Conditional" ChildrenAsTriggers="false" style="height: 100%;">
<ContentTemplate>
<asp:TextBox ID="txtQuickSearch" CssClass="textinput" onmouseover="this.select()" onfocus="this.select()" onkeydown="QuickSearch()" runat="server"></asp:TextBox>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="btnSearchFilter" />
</Triggers>
</asp:UpdatePanel>
There will be a runtime server error : "A control with ID 'btnSearchFilter' could not be found for the trigger in UpdatePanel 'uptxtQuickSearch'."
So I've to register it on the Page_load event with ScriptManager :
ScriptManager scriptManager = ScriptManager.GetCurrent(this.Page);
scriptManager.RegisterAsyncPostBackControl(btnSearchFilter);
but in this case, I still have to update the UpdatePanel manually by using Update() method on the end of btnSearchFilter_click event.
Is there any way to update the panel automatically while registering the trigger on the code-behind?
I've found a solution for this issue. It turns out that you don't really need to register the control using RegisterAsyncPostBackControl method.
you just need to add the trigger on Page_Init event and use the control.UniqueID if the control cannot be found on the runtime.
So the aspx will be like this :
<asp:UpdatePanel ID="uptxtQuickSearch" runat="server" UpdateMode="Conditional" ChildrenAsTriggers="false" style="height: 100%;">
<ContentTemplate>
<asp:TextBox ID="txtQuickSearch" CssClass="textinput" onmouseover="this.select()" onfocus="this.select()" onkeydown="QuickSearch()" runat="server"></asp:TextBox>
</ContentTemplate>
</asp:UpdatePanel>
and in code-behind :
protected void Page_Init(object sender, EventArgs e)
{
uptxtQuickSearch.Triggers.Add(new AsyncPostBackTrigger() { ControlID = btnSearchFilter.UniqueID });
}
I DONT WANNA GET MY PAGE TO BE GET REFRESH OR POSTBACK
So I am trying uploading file in updatepanel but onclicking upload button the validation check shows that there is no file
my html code is
<asp:UpdatePanel ID="UpdatePanel16" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<asp:FileUpload ID="fp_upload" runat="server" />
<asp:Button ID="btn_browse" runat="server" Text="Upload" OnClick="btn_browse_Click" />
</ContentTemplate>
</asp:UpdatePanel>
It seems to be
my .cs code is
protected void btn_browse_Click(object sender, EventArgs e)
{
if (fp_upload.HasFile)
{
Response.Write("contains file");
}
else
{
Response.Write("no file");
}
}
when I used to browse the file and click on upload button every times it goes in else condition. Whats the problem.
ALSO I DONT WANNA GET MY PAGE TO BE GET REFRESH OR POSTBACK
To use a FileUpload control inside an UpdatePanel control, set the postback control that submits the file to be a PostBackTrigger control for the panel.
just add PostBackTrigger after </ContentTemplate> for the FileUploader as below:
</ContentTemplate>
<Triggers>
<asp:PostBackTrigger ControlID="FileUpload1" />
</Triggers>
</asp:UpdatePanel>
and add the below code in page load :
ScriptManager.GetCurrent(this).RegisterPostBackControl(FileUpload1);
or if you want to make it async, you can use this :
<asp:ScriptManager ID="ScriptManager1" runat="server" />
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:FileUpload ID="FileUpload1" runat="server" />
<asp:Button ID="btnAsyncUpload" runat="server"
Text="Async_Upload" OnClick = "Async_Upload_File" />
<asp:Button ID="btnUpload" runat="server" Text="Upload"
OnClick = "Upload_File" />
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID = "btnAsyncUpload"
EventName = "Click" />
<asp:PostBackTrigger ControlID = "btnUpload" />
</Triggers>
</asp:UpdatePanel>
Write trigger will instruct the button that we are using for the upload to perform a full postback
<asp:UpdatePanel ID="UpdatePanel16" runat="server">
<Triggers>
<asp:PostBackTrigger ControlID="btn_browse" />
</Triggers>
<ContentTemplate>
<asp:FileUpload ID="fp_upload" runat="server" />
<asp:Button ID="btn_browse" runat="server" Text="Upload" OnClick="btn_browse_Click" />
</ContentTemplate>
</asp:UpdatePanel>