<%@ Page Language="C#" AutoEventWireup="true" CodeFile="TextBox.aspx.cs" Inherits="TextBox" %>
<!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>无标题页</title>
<script language="javascript" type="text/javascript">
function editorCheck()
{
var textBox1 = document.getElementById("TextBox1").value;
var n = 8 - textBox1.length;
if(n < 0)
{
document.getElementById("Label1").style.color= "#FF0000";
}
else
{
document.getElementById("Label1").style.color= "#008000";
}
}
</script>
</head>
<body>
<form /></div>
</form>
</body>
</html>
================================================================
<div>
<asp:TextBox ID="TextBox1" runat="server" Height="373px" TextMode="MultiLine" Width="429px" onpropertychange="javascript:document.getElementById('Label1').innerText='您还可输入 ' + (8 - this.value.length) + ' 个字符'"></asp:TextBox>
<asp:Label ID="Label1" runat="server" Font-Bold="True" Font-Underline="False" ForeColor="Red"
Height="31px" Width="326px">您还可输入 8000 个字符</asp:Label></div>
//******************************************************************** 后台。。。
protected void Button1_Click(object sender, EventArgs e)
{
if (System.Text.RegularExpressions.Regex.IsMatch(this.Label1.Text, "-"))
{
//return true;
Page.RegisterStartupScript("onclick ", " <script> alert( 'alert!!alert!! '); </script> ");
}
}
protected void TextBox1_TextChanged(object sender, EventArgs e)
{
int i = this.TextBox1.Text.Length;
this.Label1.Text = "您还可输入 " + Convert.ToString(8 - i) + " 个字符";
}
protected void Button2_Click(object sender, EventArgs e)
{
if (System.Text.RegularExpressions.Regex.IsMatch(this.Label1.Text, "-"))
{
Response.Write(this.Label1.Text);
}
}