HOW TO CALL FILE UPLOADER FROM A BUTTON CLICK

CALL FILE UPLOADER  FROM A BUTTON CLICK

method 1

we cannot change the text of  file uploader(ajax asynch fileuploader) ,but we can call it from button click.

1)set file uploader width and height=0;

<asp:AsyncFileUpload ID="AsyncFileUpload1" Width="0px" Height="0px" runat="server" OnUploadedComplete="AsyncFileUpload1_UploadedComplete" />

2)call the file uploader from a button 

<asp:Button ID="Button1"  runat="server" OnClick="Button1_Click" OnClientClick="document.getElementById('AsyncFileUpload1_ctl02').click(); return false" Text="Upload Now..." />

3) get file name incode behind

 protected void AsyncFileUpload1_UploadedComplete(object sender, AjaxControlToolkit.AsyncFileUploadEventArgs e)
    {
        string file = System.IO.Path.GetFileName(AsyncFileUpload1.PostedFile.FileName);

    }


method =2
if you are using html file uploder  you can use this method
1)test is a javascript function which is onlyused for perform post back operation ,you can use any other method to perform postback.

 <input type="file" class="_n _5f0v" title="Choose a file to upload" onchange="test();" accept=".txt" name="file" id="FileUpload11" runat="server" />

call html fileupload click event from asp button(or html)
<asp:Button ID="Button2" runat="server" Text="Button" OnClick="Button2_Click" OnClientClick="document.getElementById('FileUpload11').click(); return false" />


 <script type="text/javascript">
        function test() {
         
            var x = document.getElementById("FileUpload11").value;
            document.getElementById("<%= Button3.ClientID %>").click();
           
        }

    </script>

here button3 is used to perform post back operation you will get the value in code behind by using  following code

int contentLength = FileUpload11.PostedFile.ContentLength;//You may need it for validation
     string contentType = FileUpload11.PostedFile.ContentType;//You may need it for validation
        string fileName = FileUpload11.PostedFile.FileName;

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