java script file control

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i am building a file uploading site ,in which if user select same file twice then i want to clear that value by javascript,
how can i change html file control's path to null.

thanks & Regards

Posted 21-Sep-11 20:50pm

pawantiwari52

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3 solutions

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Sunasara Imdadhusen · Answer 1 · 2011-09-21T21:03:00

Solution 1

You can clear upload file value using following:

JavaScript

document.getElementById('<%=fluUpload.ClientID%>').value='';

Posted 21-Sep-11 21:03pm

Sunasara Imdadhusen

Comments

pawantiwari52 8-Nov-11 3:50am

try this by yourself this is not working due to security reasons.

manavya · Answer 2 · 2011-09-21T21:49:00

Solution 2

call floowing javascript function with ConrolID as parameter

C#

<script type="text/javascript"> 
function clearFileInput( id )
{
   var elem = document.getElementById( id );
   elem.parentNode.innerHTML = "";
}
</script>

Posted 21-Sep-11 21:49pm

manavya

Muralikrishna8811 · Answer 3 · 2011-09-21T23:20:00

Hi,

I tried some code for your requirement.Try this

HTML

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <script src="Scripts/jquery-1.4.1-vsdoc.js" type="text/javascript"></script>
    <script src="Scripts/jquery-1.4.1.js" type="text/javascript"></script>
    <script language ="javascript" >
        function f1() {
            document.getElementById("fileupload1").parentElement.innerHTML = "<input type =\"file\" id=\"fileupload1\"  />";
      }
    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <div id="divid" runat="server">
    <input type ="file" id="fileupload1"  />
    </div>
     
     <input type ="button" value="change" onclick ="f1()" />
        <asp:button id="Button1" runat="server" text="Button" onclientclick="f1()" onclick="Button1_Click" xmlns:asp="#unknown" />
   

    </div>
    </form>
</body>
</html>

I hope It can works for you also.

I searched alot but i don't find correct solution because.

If we change file type input tags it leads to some security breaches .

finally I tried this code .I hope you understood what I said

If you use Jquery Then you can check user uploaded files in server side.

All the Best