开发学院WEB开发ASP.NET textbox的textmode取为multiline时,其maxlength不... 阅读

textbox的textmode取为multiline时,其maxlength不起作用 解决方法

 2009-03-25 17:42:29 来源:WEB开发网   
核心提示:方法一: 验证控件验证(经实践可行)Setting the Maxength of a TextBox when it is in Multiline, You can use RegularExPRessionValidator control as shown below <asp:TextBox ID=&

方法一:  验证控件验证(经实践可行)


Setting the Maxength of a TextBox when it is in Multiline, You can use RegularExPRessionValidator control as shown below

<asp:TextBox ID="txtConclusion" MaxLength="200" TextMode="MultiLine" Height="100px" Width="400px" runat="server" />
<asp:RegularExpressionValidator ID="txtConclusionValidator1" ControlToValidate="txtConclusion" Text="超过200字" ValidationExpression="^[\s\S]{0,200}$" runat="server" />

方法二: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);");
     }
方法三: 自定义控件

Multiline TextBox with MaxLength Validation
http://www.codeproject.com/KB/aspnet/Textarea_Length_Validator.aspx

Tags:textbox textmode multiline

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