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上一篇：验证控件介绍--RegularExpressionValidator >>

验证控件介绍--RangeValidator

作者： unknow
RangeValidator控件主要界定输入的值的范围。因为有时我们要求输入的值是要有一定范围的，所以我们要使用RangeValidator来判断。
在下面的这个例子中，我们将来介绍RangeValidator控件。
请看validata5.aspx的程序内容：
<!--源文件：form\web页面简介\validate5.aspx-->
<%@ Page clienttarget=downlevel %>
<html>
<center>
<title>RangeValidator控件演示</title>
<head>
    <script language="VB" runat="server">
        Sub Button1_Click(sender As Object, e As EventArgs)
           If (Page.IsValid) Then
              lblOutput.Text = "结果正确!"
           Else
              lblOutput.Text = "结果不正确!"
           End If
        End Sub
        Sub lstOperator_SelectedIndexChanged(sender As Object, e As EventArgs)
            rangeVal.Type = lstType.SelectedIndex
            rangeVal.Validate
        End Sub
   </script>
</head>
<body>

    <h3><font face="Verdana">RangeValidator控件演示</font></h3>
    <p>
    <form runat="server">
      <table bgcolor="#eeeeee" cellpadding=10>
      <tr valign="top">
        <td>
            <h5><font face="Verdana">输入要验证的值:</font></h5>
            <asp:TextBox Selected id="txtComp" runat="server"/>
        </td>
        <td>
            <h5><font face="Verdana">数据类型:</font></h5>
            <asp:DropDownList id="lstType" OnSelectedIndexChanged="lstOperator_SelectedIndexChanged"  runat=server>
                <asp:ListItem Selected Value="String" >String</asp:ListItem>
                <asp:ListItem Value="Integer" >Integer</asp:ListItem>
            </asp:DropDownList>
        </td>
        <td>
            <h5><font face="Verdana">最小值:</font></h5>
            <asp:TextBox id="txtMin" runat="server" />
        </td>
        <td>
            <h5><font face="Verdana">最大值:</font></h5>
            <asp:TextBox id="txtMax" runat="server" /><p>
            <asp:Button Text="验证" ID="Button1" onclick="Button1_Click" runat="server" />
        </td>
      </tr>
     </table>
     <asp:RangeValidator id="rangeVal" Type="String" ControlToValidate="txtComp" MaximumControl="txtMax" MinimumControl="txtMin" runat="server"/>
     <br>
     <asp:Label id="lblOutput" Font-Name="verdana" Font-Size="10pt" runat="server" />
    </form>
</body>
</center>
</html>
当我们在三个文本框中分别输入要验证的值，最大值，和最小值，然后按下验证按钮，页面上将显示判断的结果。
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