asp.net button 提交前验证

1. js:
   1. <script type="text/javascript">   
   2.         function test() {   
   3.             var isCheck = document.getElementById('checkbox').checked;   
   4.             if (isCheck) {   
   5.           //Page_ClientValidate('submit'),这里有不同的ValidGroup,所以Page_ClientValidate传递是指定的GroupName   
   6.                 if (Page_ClientValidate('submit')) {   
   7.                      alert('验证成功');   
   8.                     return true;   
   9.                  }   
   10.              }   
   11.             else {   
   12.                  alert('您必须同意注册协议');   
   13.                 return false;   
   14.              }   
   15.   
   16.             return false;   
   17.          }   
   18.      </script>  
   1. <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>  
   2.        <asp:Button ID="Button1" runat="server" Text="Button" ValidationGroup="submit" CausesValidation="True"  
   3.            OnClientClick="return test();" OnClick="Button1_Click" />  
   4.        <input type="checkbox" id="checkbox" />我已阅读注册协议   
   5.        <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ControlToValidate="TextBox1"  
   6.            Display="Dynamic" ErrorMessage="不能为空" ValidationGroup="submit"></asp:RequiredFieldValidator>  
   <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox> <asp:Button ID="Button1" runat="server" Text="Button" ValidationGroup="submit" CausesValidation="True" OnClientClick="return test();" OnClick="Button1_Click" />