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多行文本框限制输入字符长度(两种方法)

2006-12-19 15:52 337 查看
方法一：弹出对话框提示
1.html代码


<HTML>


<HEAD>


<title>WebForm6</title>


<meta name="GENERATOR" Content="Microsoft Visual Studio .NET 7.1">


<meta name="CODE_LANGUAGE" Content="C#">


<meta name="vs_defaultClientScript" content="JavaScript">


<meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">




<script language="javascript">



function isOver(sText,len)






{


var intlen=sText.value.length;


if (intlen>len)






{


alert("The content length must Less than or Equal "+len);


sText.focus();


sText.select();


}


}


</script>


</HEAD>


<body MS_POSITIONING="GridLayout">


<form id="Form1" method="post" runat="server">


<asp:TextBox id="txtName" style="Z-INDEX: 102; LEFT: 200px; POSITION: absolute; TOP: 104px" runat="server"


TextMode="MultiLine" Height="112px" Width="271px"></asp:TextBox>


</form>


</body>


</HTML>
2.cs代码


private void Page_Load(object sender, System.EventArgs e)






{


this.txtName.Attributes.Add("onblur","isOver(this,1000);");


}
方法二：限制用户继续输入


<HEAD>


<!-- TWO STEPS TO INSTALL LIMIT TEXTAREA:




1. Copy the coding into the HEAD of your HTML document


2. Add the last code into the BODY of your HTML document -->


<!-- STEP ONE: Paste this code into the HEAD of your HTML document -->




<SCRIPT LANGUAGE="JavaScript">



<!-- Original: Ronnie T. Moore -->


<!-- Web Site: The JavaScript Source -->




<!-- Dynamic 'fix' by: Nannette Thacker -->


<!-- Web Site: http://www.shiningstar.net -->




<!-- This script and many more are available free online at -->


<!-- The JavaScript Source!! http://javascript.internet.com -->




<!-- Begin




function textCounter(field, countfield, maxlimit)

{


if (field.value.length > maxlimit) // if too long

trim it!


field.value = field.value.substring(0, maxlimit);


// otherwise, update 'characters left' counter


else


countfield.value = maxlimit - field.value.length;


}


// End -->


</SCRIPT>


<!-- STEP TWO: Copy this code into the BODY of your HTML document -->


</HEAD>


<BODY>


<!-- textCounter() parameters are: text field, the count field, max length -->


<center>


<form name="myform" action="YOUR-SCRIPT.CGI">


<font size="1" face="arial, helvetica, sans-serif">( You may enter up to 125


characters. )<br>


<textarea name="message" wrap="physical" cols="28" rows="4" onKeyDown="textCounter(this.form.message,this.form.remLen,125);"


onKeyUp="textCounter(this.form.message,this.form.remLen,125);"></textarea>


<br>


<input readonly type="text" name="remLen" size="3" maxlength="3" value="125"> characters


left</font>


</form>


</center>


<p><center>


<font face="arial, helvetica" SIZE="-2">Free JavaScripts provided<br>


by <a href="http://javascriptsource.com">The JavaScript Source</a></font>


</center>


</BODY>
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