asp.net javascript表单验证简单范例

 

<% @ Page Language = " C# "  AutoEventWireup = " true "   CodeFile = " Default.aspx.cs "  Inherits = " _Default "   %>

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 > Untitled Page title >
     < script language  = javascript  >
    function check()
     ... {
      /**////注意javascript中正则表示式的写法:  /表示式/
      var rg= /^[w-]+(.[w-]+)*@[w-]+(.[w-]+)+$/;
      
     if(document.getElementById("txtid").value=="000")
     ...{
       
       alert("Can't Be 000");
       document.all("txtid").focus();
        return false;
     }
 
      var str=document.getElementById("txtmail").value;
      if(!rg.test(str))
      ...{
        alert("Email Addess error!!");
        document.all("txtmail").focus();
       return false;
       }
     else
     ...{
       return true;
     }
     
    
    }
     script >
head >
< body >
     < form id = " form1 "  runat = " server " >
         < asp:TextBox ID = " txtmail "  runat = " server "  Style = " left: 270px; position: relative;
            top: 221px " >;
    
         < asp:Button id = " btuLogin "  OnClientClick  = " return check() "  runat = " server "  Style = " left: 211px; position: relative; top: 289px "
            Text = " Button "  OnClick = " btuLogin_Click "    />
         < asp:TextBox ID = " txtid "   runat = " server "  Style = " left: 48px; position: relative;
            top: 159px " > 
     form >
body >
html >