Javascript error

Hello Experts,

I have a javascript function which is called Client-Side on button Click event. Where I'm passing arguments as ClientID.
 function Validate(id)
       var txtData = document.getElementById(id);

on button:

<asp:Button ID="btnload" Text="Upload" runat="Server" Width="70px" Height="25px"
                                                            OnClientClick="Validate('<%= fuInfo.ClientID %>')" />

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When I try to access variable txtdata, I get nothing or BLANK. For testing purpose I checked the parameter value of ID, its has data(using alert statement), but when I do document.getElementById, then no result.

If I do this, it works:
var txtData = document.getElementById('<%= fu.ClientID %>');

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Paul JacksonSoftware EngineerCommented:
In your onclientclick you are passing in the ClientID of fuInfo :

OnClientClick="Validate('<%= fuInfo.ClientID %>')"

, in the code you say that works you are using fu.ClientID.

maybe your OnClientClick should be : OnClientClick="Validate('<%= fu.ClientID %>')"
what about :
<script language="javascript" type="text/javascript">
var fuInfo = '<%= fuInfo.ClientID %>';
<asp:Button ID="btnload" Text="Upload" runat="Server" Width="70px" Height="25px"
                                                            OnClientClick="Validate(fuInfo)" />

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Tom BeckCommented:
What about in code behind?

btnLoad.Attributes.Add("onclick", "Validate(\"" + fuInfo.ClientID + "\")");
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Lalit ChandraCommented:
i think you need to replace your button decleration to

<asp:Button ID="btnload" Text="Upload" runat="Server" Width="70px" Height="25px"
                                                            OnClientClick="Validate('<%= fu..ClientID %>')" />
Dave BaldwinFixer of ProblemsCommented:
var txtData = document.getElementById(id);  gets the 'object' without any of the details.  You have to use one of the properties of the object to display or do anything.  Like this example shows the 'innerHTML'.  For <input> tags, you usually use the 'value'.

<script type="text/javascript">
function getValue()
var x=document.getElementById("myHeader");
<p id='myHeader'>This is the innerHTML.</p>

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ASPDEVAuthor Commented:
Sorry, but none of them worked.

The reason for client ID of each control because I have 3 buttons and 3 Fileupload buttons.

On each button click, I want to make use of same function Validate(), so that I can pass each clientId of Fileupload button.

If I write  different function(does same logic) for each button, then it works!
Lalit ChandraCommented:
why don't you try jquery for that. you can simple code the following
$(function() {
   $("#button1").click(function  {
       var str = $("#fileUpload1").val();
   $("#button2").click(function  {
       var str = $("#fileUpload2").val();
   $("#button3").click(function  {
       var str = $("#fileUpload3").val();


Hope this will resolve your problem.

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Vishal KedarCommented:
try below js function instead of yours

function Validate(id)
          // var txtData = document.getElementById(id);


may it helps
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