ValidatorCalloutExtender(扩展验证功能)控件

      ValidatorCalloutExtender该控件用于扩展验证控件，对验证控件的错误提示进行样式化及强调化。

下面来看一个示例：

1)在VS2005中新建一个ASP.NET AJAX-Enabled Web Project项目工程，命名为ValidatorCalloutExtender1。

2)在页面上拖放2个TextBox,用于输入用户名和电话号码。同时对输入用户名的TextBox，加一个RequiredFieldValidator；对输入电话号码的TextBox，加一个RequiredFieldValidator和RegularExpressionValidator。同时对每个Validator扩展一个ValidatorCalloutExtender。

代码如下：

 1    <div>
 2        Name:  
 3        <asp:TextBox ID="txtName" runat="server">asp:TextBox>
 4        <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ControlToValidate="txtName"
 5            Display="None" ErrorMessage="Name is required">asp:RequiredFieldValidator>
 6        <cc1:ValidatorCalloutExtender ID="ValidatorCalloutExtender1" runat="server" TargetControlID="RequiredFieldValidator1">
 7        cc1:ValidatorCalloutExtender>
 8        <br />
 9        <br />
10        phone:  
11        <asp:TextBox ID="txtPhone" runat="server" OnTextChanged="TextBox2_TextChanged">asp:TextBox>
12        <asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server" ControlToValidate="txtPhone"
13            Display="None" ErrorMessage="phone is required">asp:RequiredFieldValidator>
14        <asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server" ControlToValidate="txtPhone"
15            Display="None" ErrorMessage="RegularExpressionValidator" ValidationExpression="(\(\d{3}\)|\d{3}-)?\d{8}">asp:RegularExpressionValidator>
16        <cc1:ValidatorCalloutExtender ID="ValidatorCalloutExtender2" runat="server" TargetControlID="RequiredFieldValidator2">
17        cc1:ValidatorCalloutExtender>
18        <cc1:ValidatorCalloutExtender ID="ValidatorCalloutExtender3" runat="server" TargetControlID="RegularExpressionValidator1">
19        cc1:ValidatorCalloutExtender>
20        <br />
21        <br />
22        <asp:Button ID="Button1" runat="server" Text="Button" />div>

3)按下CTRL+F5，在浏览器里查看效果。

效果图如下：