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Is there a way to check Fileupload has file or not in client side.If It has i want to enable button

Nattapong Unaregul792421-Jul-2012
Here is my code in default.aspx .The default.aspx is in the content place
<%@ Page Language="VB" MasterPageFile="~/MasterPage.master" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="_Default" title="Untitled Page" %>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
<table>
   <tr> <td><asp:FileUpload ID="FileUpload1" runat="server" " /></td>
           <td> <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ErrorMessage="Task cannot be blank"
        InitialValue="" ControlToValidate="FileUpload1"> </asp:RequiredFieldValidator></td></tr>
   <tr><td><asp:Button ID="SaveBT" runat="server" Text="Button" Enable = "False"  /></td></tr> 
  </table>    
  

</asp:Content>


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Updated on 22-Jul-2012
Nattapong Unaregul

Nattapong Unaregul

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2 Answers

Nattapong Unaregul

Nattapong Unaregul

22-Jul-2012
Thank for your advice.Here is my solution

<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" runat="server">
    <asp:FileUpload ID="FileUpload1" runat="server" onchange="FileUpload_OnChange(this,event);"   />  &nbsp; &nbsp; &nbsp;
<table>
   <tr>  <td> <input type="button" value = "Preview" /></td> </tr> 
    </table>
    
    <script  language="javascript" type ="text/javascript" >
        function Alert(myButton) {
            alert(myButton)
}
            function changeColor(myButton) {
            myButton.value = "OK";
        }
        function FileUpload_OnChange(sender, e) {

            document.getElementById('<%=Button1.ClientID %>').disabled = false;
        }
    </script>
</asp:Content>
Anonymous User

Anonymous User

21-Jul-2012
Hi Nattapong Unaregul,

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