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Count characters left on keypress using javascript


<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>


<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>Untitled Page</title>


    <script type="text/javascript" language="javascript">
     function CountTxtLeft(StrTxt, txtCount, totaltxt) {
    if (StrTxt.value.length > totaltxt) 
    {
        StrTxt.value = StrTxt.value.substring(0, totaltxt);
        }
    else
    {
        txtCount.value ='Total characters left :' + (totaltxt - StrTxt.value.length);
        }
}
    </script>


</head>
<body>
    <form id="form1" runat="server">
    <div>
        <textarea id="message" runat="server" cols="1" onkeydown="CountTxtLeft(this.form.message,this.form.charleft,140);"
            onkeyup="CountTxtLeft(this.form.message,this.form.charleft,140);" style="border: thin solid gray;
            width: 407px; height: 114px">
            </textarea>
    </div>
    <input id="charleft" type="text" readonly="true" style="border: none 0px transparent;
        width: 186px;" />
    </form>
</body>
</html>

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