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纯JS控制textarea的maxLength

发表:2015-12-10    编辑:南昌开优网络    浏览:4174    
标签:JS应用

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="text_area.aspx.cs" Inherits="text_area" %>
<!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>纯JS限制文本框字数</title>
    <script type="text/javascript">
        window.onload = function() {
            document.getElementById("txtContent").onkeyup = function() {
                var len = this.value.length;
                var tmp = 10 - len;
                if (tmp <= 0) {
                    this.value = this.value.substring(0, 10);
                    document.getElementById("mes").innerHTML = "您还可以输入 0 个字符";
                } else {
                    document.getElementById("mes").innerHTML = "您还可以输入 " + tmp + " 个字符";
                }
            }
        }
    </script>


</head>
<body>
    <form id="form1" runat="server">
    <asp:TextBox ID="txtContent" TextMode="MultiLine" runat="server" Height="190px" Width="439px"></asp:TextBox>
    <div id="mes">
        您还可以输入 10 个字符
    </div>
    </form>
</body>
</html>
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