I have 3 file upload controls where people upload csv files. If my submit button isn't inside an update panel the file upload have the files in the code behind and everything works fine. However, I would like my submit button inside an update panel as based on some other controls on the form I enable/disable the button via the update panel. This enabling and disabling works fine, but now in the button click codebehind the file upload controls always have null values even though a csv file was selected.
Why is the update panel around my submit button causing the file upload controls to not have anything in them even though files were selected?
So I have a FileUpload control on the page like:
<asp:FileUpload ID="file1" runat="server" />
I have a submit button in an update panel like:
<asp:UpdatePanel ID="pnlSubmitButton" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<asp:Button ID="button1" runat="server" Test="Submit" onclick="button1_Click" />
</ContentTemplate>
</asp:UpdatePanel>
In my code behind on the button click event
protected void button1_Click(object sender, EventArgs e)
{
// file1.FileName is empty even though I did select a file
}
If I remove the update panel around the button file1.FileName in the button click is then populated
As far as I know, asp:FileUpload wont works under UpdatePanel async trigger. You need to set upload button click under post back trigger to make it working. Something like this:
<triggers>
<postbacktrigger controlid="btnSubmit"/>
</triggers>
Related
What I would like to do is be able to disable a button as soon as it pressed, perform an operation, and re-enable the button. Seemed simple enough, but my button doesn't update when I need it to. I tried an update panel, but I'm not sure if I'm using it correctly. Am I doing something wrong? Or is there a better way to achieve this?
HTML
<asp:UpdatePanel runat="server" ID="updateSubmitButton">
<ContentTemplate>
<asp:Button ID="btnSearch" CssClass="CrossoverButton" runat="server" Text="Search" OnClick="btnSearch_Click" />
</ContentTemplate>
</asp:UpdatePanel>
C#
protected void btnSearch_Click(object sender, EventArgs e)
{
btnSearch.Enabled = false;
updateContent();
// Do a lengthy operation here.
btnSearch.Enabled = true;
}
You will need to use a client side technology to disable the button. This is because when you click the button, the page does a post back to itself, which tells the server to execute btnSearch_Click. Based on your code this will
Disable the button
Update the content
Re-enable the button
all of this happens on the server. Only after the method has finished executing, does it return context to the page.
In order to disable the button on click, you'll want to try something this:
<asp:Button ID="btnSearch" CssClass="CrossoverButton" runat="server" Text="Search"
OnClientClick="this.disabled = true;"
UseSubmitBehavior="false" />
OnClientClick="this.disabled = true;"
This line registers the client click handler, to disable itself.
UseSubmitBehavior="false"
This line tells ASP.NET to include the disabled element in the form post, so the server knows which control registered the postback.
See also -- https://stackoverflow.com/a/11832053/86860
All the actions in btnSearch_Click will be performed on server. The page will not be rendered until full page lifecycle ends.
If you want to disable the button you should use javascript to do this, and then only after disabling the button make a postback to the page.
I have a user control placed inside an update panel, ie like this.
<asp:UpdatePanel ID="testupdatepnl" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<uc1:TestControl ID="ctlTest" runat="server" />
</ContentTemplate>
</asp:UpdatePanel>
Now i got a button placed inside this user control say Click. I want to postback the whole page on the button click.
I tried to add a postback trigger like this
<Triggers>
<asp:PostBackTrigger ControlID="clickButton" />
</Triggers>
Since the button is inside the usercontrol , i got error while running like this.
Is there any way to do a postback for this button.
Remove the <Triggers> from HTML & Add this to PageLoad event
ScriptManager scriptManager = ScriptManager.GetCurrent(this.Page);
scriptManager.RegisterPostBackControl(WebUserControl11.FindControl("ButtonId"));
Note : Learned from this
Because button you are using as trigger is placed inside update panel and after render its client id gets changed.
Make the button accessable from user control and declare the trigger at server side e.g.
var ClickButton= ctlTest.FindControl("clickButton") as Button;
var trigger = new PostBackTrigger();
trigger.ControlID = ClickButton.UniqueID.ToString();
testupdatepnl.Triggers.Add(trigger);
See the following thread for more details
Trigger a button inside a UpdatePanel with a LoginView
You should also note that if you are using Ajax Control Toolkit. You can replace ScriptManager to ToolkitScriptManager.
Dim btn As Button = CType(UserControl.FindControl("ButtonID"), Button)
AjaxControlToolkit.ToolkitScriptManager.GetCurrent(Page).RegisterPostBackControl(btn)
I have a file upload inside the update panel, and an upload button that uploads the file to the server. Is it possible to upload the file without clicking the upload button? I want to remove the upload button and upload the file as soon as the file is selected from the user's machine. Or, have a 4 second timer, then call the upload_click to check if the fileupload has a file or not. How can I do it without a button inside update panel?
<asp:UpdatePanel ID="UP_DDL" runat="server" UpdateMode="Always" ChildrenAsTriggers="true">
<ContentTemplate>
<asp:FileUpload ID="FileUpload1" runat="server" />
<asp:Button ID="Upload" OnClick="Upload_Click" runat="server" Text="Upload" />
</ContentTemplate>
<Triggers>
<asp:PostBackTrigger ControlID="Upload"/>
</Triggers>
</asp:UpdatePanel>
protected void Upload_Click(object sender, EventArgs e)
{
if (FileUpload1.HasFile)
{
//create the path to save the file to
string fileName = Path.Combine(Server.MapPath("~/Bulk Upload"), FileUpload1.FileName);
//save the file to our local path
FileUpload1.SaveAs(fileName);
}
}
I am sure you can use any of the events on the HTML INPUT File element to fire up a full post back, which is all you need in order to upload the file automatically.
Google, at least on the standard interface, uses some sort of Flash plugin to accomplish what you want.
There might be some other jQuery plugins that provide this functionality out of the box. This one, for example, seems to do it.
You would need to mimic the click with some client-side code, such as using submit from Javascript - and this is not supported by at least one notable browser, I believe, IE.
Otherwise, you could use jQuery ajax calls to static web methods which do uploads on the fly, behind the scenes, when the value of the file upload control have changed.
You can hide Upload button with display:none inline style and add following code to Page_PreRender method:
FileUpload1.Attributes["onchange"] = ClientScript.GetPostBackClientHyperlink(Upload, "");
Or consider to use AsyncFileUpload control from AjaxControlToolkit
I have one form to save customer details.For that i have used updatepanel & formview. Also i used modalpopupextender to open popup in Click event of image button inside that form. But when i am using modalpopupextender then i cant save my customer details, without use of modalpopupextender i can save customer details. For that i have added code as following, but its giving error as "An extender can't be in a different UpdatePanel than the control it extends." :
<asp:ImageButton ID="imb1"
Text="Refresh Panel"
runat="server" />
<asp:ScriptManager ID="ScriptManager1"
runat="server" />
<asp:UpdatePanel ID="UpdatePanel1"
UpdateMode="Conditional"
runat="server">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="imb1" />
</Triggers>
<ContentTemplate>
// Here is my code to add
</ContentTemplate>
</asp:UpdatePanel>
Please help me what to do?
Asp.net c#
This error raises because your button which is used to open popup in updatepanel and your modal popup in any other update panel or you have placed it out of update panel.
Solution 1: place modal popup inside update panel in which your calling popup button exist.
solution 2: place button outside update panel and modal popup too.
Both things should be placed in same condition if button in update panel then popup should also be in same update panel And if button outside update panel then popup also outside update panel.
If you find your solution kindly mark my answer and point it up,thanks.
You're receiving this error because the TargetControlID, assuming it's the image button, resides outside of the update panel.
I am writing a card game app using Ajax, c# and .NET 3.5. Due to the nature of the interface I have numerous update panels that Im trying to manage and update across various user action. I'm having problems with one though.
The players current hand is built by binding a list of Card objects to a repeater and then dynamically creating a Card UserControl and adding it to the Controls of a PlaceHolder when each item is databound. The code is roughly as follows:
On the page
<asp:UpdatePanel ID="pnlInHand" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<asp:Repeater ID="rptInHand" runat="server" onitemdatabound="rptInHand_ItemDataBound">
<ItemTemplate>
<asp:PlaceHolder ID="plcInHandCard" runat="server" />
</ItemTemplate>
</asp:Repeater>
</ContentTemplate>
</asp:UpdatePanel>
In code behind
protected void rptInHand_ItemDataBound(object sender, RepeaterItemEventArgs e)
{
Card card = (Card)e.Item.DataItem;
PlaceHolder plcCard = (PlaceHolder)e.Item.FindControl("plcInHandCard");
plcCard.Controls.Add(CreateCardControl());
}
private CardControl CreateCardControl()
{
CardControl cardControl = (CardControl)Page.LoadControl("~/UserControls/CardControl.ascx");
//Set control properties here
return cardControl;
}
The Card Control includes a Button. The ClickEvent for this button calls a Method of the Parent Page that needs to update a seperate UpdatePanel as well as remove the card Control from the Panel that it is sitting within.
I have two issues.
When I click the Card Control Button, because it has been created as part of a repeater within an updatePanel, it no longer exists when the page is posted back and so the Click event for the button within the control never fires. I can obviously rebind the repeater on page load, but does this mean I have to essentially do this on every postback?
More importantly I need a way to trigger the update of another updatepanel in the parent page when the Card control's click event is raised. Is there a way of setting a trigger on an update panel that listens out for an event within a dynamicaly loaded UserControl?
Many thanks
Stewart
Sample code from ASP.net site that should address your point 2 problem follows.
I'll leave the translation to your code to you.
I may be misunderstanding what you are trying to do but I believe once you get this working your issue with point 2 is no longer relevant as you'll get the AJAX postback you want from your parent update panel.
Good luck!
<asp:UpdatePanel ID="UpdatePanel2" runat="server">
<ContentTemplate>
<asp:Repeater ID="Repeater1" runat="server" DataSourceID="SqlDataSource1" OnItemDataBound="itemDataBound">
<ItemTemplate>
<mycontrol:user ID="user1" runat="server" OnCausePostBack="user1_CausePostBack" /> <br />
</ItemTemplate>
</asp:Repeater>
</ContentTemplate>
</asp:UpdatePanel>
protected void itemDataBound(object sender, RepeaterItemEventArgs e)
{
ModalPopup_WebUserControl mw=(ModalPopup_WebUserControl)e.Item.FindControl("user1");
AsyncPostBackTrigger at = new AsyncPostBackTrigger();
at.ControlID = mw.ID;
at.EventName = "CausePostBack";
UpdatePanel2.Triggers.Add(at);
}
protected void user1_CausePostBack(object sender, EventArgs e)
{
// do something
}
just an idea for point 2 : what about add a property in the cardControl to set a reference to the updatepanel/s ? from there you can add triggers or call panel.update in the button event
for point one yes u will have to do it. u will have to re create the controls
for point 2 a simple updatePanel.update() would do the job insode of any event if you are using an event that was binded to a dynamically created control then u will have to rebind the event on every page postback