Click here to Skip to main content
12,511,648 members (48,442 online)
Rate this:
 
Please Sign up or sign in to vote.
See more: ASP.NET
Hi,

I would like to know how to achieve the following:

Show (hidden with code behind on page load) an ASP Button, when the FileUpload ASP control has a file selected.

aspx

<asp:FileUpload ID="FileUpload1" runat="server" onchange="showButton()"/>
                       <p><asp:Button ID="Button1" runat="server"  Text="Upload File" />&nbsp;</p>


When FileUpload1 has a file selected the onchange should fire
(Button 1 stays hidden and does not show)

Javascript:

<script type ="text/javascript" >
          function showButton() {
              document.getElementById('<%=Button1.ClientID%>').style.visibility = "visible";
          }
</script>

but this does not work.

Please let me know what I am doing wrong.

(should Button1.Visible=true; be used in codebehind instead, if so , how in the aspx file do you tell it to do so?)
Posted 11-Jan-13 19:13pm
AU Jase651
Updated 11-Jan-13 19:14pm
v2
Rate this: bad
 
good
Please Sign up or sign in to vote.

Solution 1

Try this

<asp:fileupload id="fileupload1" runat="server" onchange="showButton()" xmlns:asp="#unknown" />
<asp:button id="btnUpload" runat="server" text="Upload" style="display:none" xmlns:asp="#unknown" />

<script type ="text/javascript" >
        function showButton() {
            document.getElementById("<%=btnUpload.ClientID%>").style.display = "";
        }
    </script>
  Permalink  
Rate this: bad
 
good
Please Sign up or sign in to vote.

Solution 2

Use

if (FileUpload1.hasfile==true)
{

// Your Statement//////////////
}
  Permalink  

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

  Print Answers RSS
Top Experts
Last 24hrsThis month


Advertise | Privacy | Mobile
Web02 | 2.8.160929.1 | Last Updated 14 Jan 2013
Copyright © CodeProject, 1999-2016
All Rights Reserved. Terms of Service
Layout: fixed | fluid

CodeProject, 503-250 Ferrand Drive Toronto Ontario, M3C 3G8 Canada +1 416-849-8900 x 100