Text Area Characters Counter Using Javascript

This is  cool text area counter, Limit Text Area,restrict the Text Area  size and count no of characters in text area

javascript function:

<script type="text/javascript">

 var counter ="150";

 window.onload = function() {

      //call this methods in page onload.

      addressDescCount();

       

      }

function addressDescCount(){

     

var addressTex = document.getElementById('address').value;

 var aCount=counter-addressTex.length;

 if(parseInt(aCount) < 0){

document.getElementById('addressLimit').innerHTML=0;

}else{

document.getElementById('addressLimit').innerHTML=aCount;

}

}

function addressCount()

{

      var tex = document.getElementById('address').value;

    var len = tex.length;

      if(len > counter){

        tex = tex.substring(0, counter);

        document.getElementById('address').value=tex;

        document.getElementById('addressLimit').innerHTML =0;

        return false;

        }

       document.getElementById('addressLimit').innerHTML = counter-len;

}

</script>

code for the form:

<div>

      <table>

      <tr><td style="color: #999999">max size :150 Characters</td></tr>

        <tr><td>

        <asp:TextBox ID="address" runat="server" TextMode="MultiLine" Height="86px"

                  onkeyup="addressCount()"    Width="423px" ></asp:TextBox>

        </td></tr>

        <tr><td>

        <asp:Label ID="addressLimit" style="float:right;padding-left:130px"  runat="server" Text="Label"></asp:Label>

        </td></tr>

      </table>

    </div>

OutPut