Javascript在ASP.NET中的用法:计算还剩余输入多少个字符

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="javascriptdemo.aspx.cs" Inherits="dupcit.javascriptdemo" %>

<!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">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>Javascript用法:计算还剩余输入多少个字符</title>
            <meta name="description" content="涂聚文,捷为工作室,经营信息流,物流,人力资源流,资本流的系统解决方案的开发与设计和服务,geoVI studio.Geovin　Du. Systems Solution to Fund flow,and Information flow,and Material flow,and Control flow,and Human Resource.Applied software development,design and service。."/>
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<meta name="Author" content="涂聚文" />
<meta name="keywords" content="涂聚文,捷为工作室,经营信息流,物流,人力资源流,资本流的系统解决方案的开发与设计和服务" />
<link rel="shortcut icon" href="favicon.ico" type="image/x-icon" />
<link rel="icon" href="favicon.ico" type="image/ico" />
<link rel="bookmark" href="favicon.ico"/> 
    <script type="text/javascript" language="javascript">
    function validatelimit(obj, maxchar)
     {
        if (this.id) obj = this;
        var remaningChar = maxchar - obj.value.length;
        document.getElementById('<%= Label1.ClientID %>').innerHTML = remaningChar;
        if (remaningChar <= 0) {
            obj.focus();
            obj.value = obj.value.substring(maxchar, 0);
            alert('Character Limit exceeds!');
            return false;
        }
        else
        { return true; }
    }
</script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
     <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
    <asp:TextBox ID="txt_Skill" runat="server" TextMode="MultiLine" onkeyup="validatelimit(this,50)"></asp:TextBox>
    </div>
    </form>
</body>
</html>
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原文地址：https://www.cnblogs.com/geovindu/p/2033974.html