怎么不能得到TextBox提示还可以输入多少字？

宋天琪

郭耀强 · 郭耀强

<head runat="server">
<title></title>
<script src="Scripts/jquery-1.4.1.js" type="text/javascript"></script>
<script type="text/javascript">

      function fun() {
         var length = $("#txtBox").val().length;
         var maxlength = $("#txtBox").attr("maxlength");
         $("#labmsg").text("还可以输入：" + (maxlength - length) + "个字符");
      }
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:TextBox runat="server" ID="txtBox" MaxLength="100" onkeydown="fun()"></asp:TextBox>

<label id="labmsg">最大100个字符</label>
</div>
</form>
</body>

马跃 · 马跃

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>文本框输入还剩多少字数统计代码示例</title>
<script language="JavaScript">
function gbcount(message,total,used,remain)
{
var max;
max = total.value;
if (message.value.length > max) {
message.value = message.value.substring(0,max);
used.value = max;
remain.value = 0;
alert("留言不能超过 100 个字!");
}
else {
used.value = message.value.length;
remain.value = max - used.value;
}
}
</script>
</head>
<body>
<form name="Myform1" method="post">
<table>
<tr class="tdbg_leftall">
  <td valign="middle" align="center">留言内容: <br> </td>
  <td colspan="4" valign="top"><textarea name="GuestContent" cols="59" rows="6" onkeydown=gbcount(this.form.GuestContent,this.form.total,this.form.used,this.form.remain); onkeyup=gbcount(this.form.GuestContent,this.form.total,this.form.used,this.form.remain);></textarea></td>
  </tr>
  <tr class="tdbg_leftall">
  <td valign="middle" align="center"></td>
  <td colspan="4" valign="top">
  最多字数：<INPUT disabled maxLength=4 name=total size=3 value=100>
  已用字数：<INPUT disabled maxLength=4 name=used size=3 value=0>
  剩余字数：<INPUT disabled maxLength=4 name=remain size=3 value=500> </td>
  </tr>
  </table>
  </form>
</body>
</html>

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怎么不能得到TextBox提示还可以输入多少字？

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