Count TextBox Characters in Realtime
http://www.dotneter.com/count-textbox-characters-in-realtime
Counting Characters Realtime in ASP.NET TextBox Using JavaScript
ASPX file
<%@ 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 id="Head1" runat="server">
<title></title>
<script type="text/javascript">
function countCharacters() {
var count = parseInt(document.getElementById('<%=TextBox1.ClientID%>').value.length);
document.getElementById('<%=Label1.ClientID%>').innerHTML = 100 - count;
}
</script>
<style type="text/css">
.style1
{
color: #FF0000;
}
</style>
</head>
<body>
<form id="form1" runat="server">
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<br />
Max 100 characters<br />
<span class="style1">Characters left:</span>
<asp:Label ID="Label1" runat="server"></asp:Label>
</form>
</body>
</html>
ASPX.CS file
protected void Page_Load(object sender, EventArgs e)
{
TextBox1.Attributes.Add("onKeyUp", "countCharacters()");
}
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