js function not running error

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my js function is perfectly working (without master page) i just needed to use it on anther page so i copy paste it in a new web form but this time using master page and now it's not running at all..that's my code:

<%@ Page Title="" Language="vb" AutoEventWireup="false"  
MasterPageFile="~/MasterPage.Master" CodeBehind="homecarecontent.aspx.vb"  
 Inherits="homecare_web2.homecarecontent" %>
 <asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" runat="server">
<head>
<title></title>
<link href="StyleSheet1.css" rel="stylesheet" type="text/css" />
<style type="text/css">
    #TextArea1
    {
        height: 152px;
        width: 222px;
    }
    #conte
    {
        height: 136px;
        width: 229px;
    }
    #content_txt
    {            height: 178px;
        width: 226px;
    }
    #content_t
    {
        height: 159px;
        width: 225px;
    }
</style>
<script type="text/javascript">
    function limiter() {
        var area = document.getElementById("content_txt");
        var message = document.getElementById("message");
        var maxLength = 160;
        var checkLength = function () {
            if (area.value.length <= maxLength) {
                message.innerHTML = (maxLength - area.value.length) + " characters remainging";
            }
        }
        setInterval(checkLength, 300);
    }
  </script>

 </head>

and that's my asp code:

<td valign='top'>
                <textarea style="resize:none; margin-bottom:0px;" id="content_txt" class="area"
                    name="TextArea1"  runat="server" maxlength="160"  önkeyup="return limiter();" ></textarea>
            </td>

the error firefox console is that the area is null... but in reality it's not null !

any help plz !

Posted 5-Sep-13 1:14am

Jocelyne El Khoury

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2 solutions

Solution 1

when we do use master pages id of control changes thats why it is not able to find the elements on the page and not working and resulting errors

C#

var area = document.getElementById("content_txt");
      var message = document.getElementById("message");

Posted 5-Sep-13 1:45am

me.ajaykumar

Comments

Jocelyne El Khoury 5-Sep-13 8:37am

ok so what shall i do?

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PJ003 · Accepted Answer · 2013-09-05T02:43:00

Solution 2

JavaScript

var area = document.getElementById('<%=content_txt.ClientID%>');
var message = document.getElementById('<%=message%>');

Posted 5-Sep-13 2:43am

PJ003

Updated 5-Sep-13 2:44am

v2