Getting input value in Javascript

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I am trying to get the value of the input in a javascript, but its not working. Given below is the code of my test page

ASP.NET

<%@ Page Title="" Language="VB" MasterPageFile="~/Site.Master" AutoEventWireup="false"
CodeFile="test3.aspx.vb" Inherits="test3" %>

<asp:Content ID="Content1" ContentPlaceHolderID="HeadContent" runat="Server">
<script language="javascript">

    function Validation() {

        var TestVar = document.getElementById('txtName').value;
        alert(TestVar);

    }

</script>
<table>
<tr>
<td align="left"><input type="text"  runat="server" id="txtName" /></td>
</tr>

<tr>
    <td align="left" class="style3">
        <asp:Button runat="server" ID="btnsubmit" Text="Submit" 
        Height="26px" OnClientClick="Validation()"  />
       
        </td></tr>
       
        </table>
</asp:Content>

Posted 20-Dec-13 8:29am

Member 7909353

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3 solutions

Solution 1

I believe you need to remove the runat="server" from your input. That is not necessary since you want the client to run that function.

<%@ Page Title="" Language="VB" MasterPageFile="~/Site.Master" AutoEventWireup="false"
CodeFile="test3.aspx.vb" Inherits="test3" %>
 
<asp:Content ID="Content1" ContentPlaceHolderID="HeadContent" runat="Server">
<script language="javascript">
 
    function Validation() {
 
        var TestVar = document.getElementById('txtName').value;
        alert(TestVar);
 
    }
 
</script>
<table>
<tr>
<td align="left"><input type="text" id="txtName" /></td>
</tr>
 
<tr>
    <td align="left" class="style3">
        <asp:Button runat="server" ID="btnsubmit" Text="Submit" 
        Height="26px" OnClientClick="Validation()"  />
       
        </td></tr>
       
        </table>
</asp:Content>

Posted 20-Dec-13 8:41am

Richard C Bishop

Updated 20-Dec-13 8:44am

v2

Comments

Member 7909353 20-Dec-13 14:47pm

But I have to access in c# also i.e. back end

Richard C Bishop 20-Dec-13 14:57pm

Ok, I just tested that and it works with it in there on my page. What is not working about it?

Solution 3

hi
solution 2 will work fine.. if not try like this,

load the page in browser and right click -> view source , find the txtName control on the page. and note down the id for it..

use that id in your javascript code..

Posted 20-Dec-13 19:18pm

Karthik_Mahalingam

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idenizeni · Accepted Answer · 2013-12-20T09:49:00

First off, why are you putting your table html element into your HeadContent container? Shouldn't you only be putting the script element in the HeadContent while putting the table in the MainContent container?

To fix your issue you need to modify the javascript line so it writes the controls ClientID.

Change this line...

JavaScript

var TestVar = document.getElementById('txtName').value;

To this...