驗證控制項介紹--CompareValidator

來源:互聯網
上載者:User
控制項 為了比較兩個控制項的值,此時我們需要使用CompareValidator 控制項。
在下面的這個例子中,我們將講解CompareValidator 控制項的用法。
先看檔案validata4.aspx:
<!--源檔案:form\web頁面簡介\validate4.aspx-->
<%@ Page clienttarget=downlevel %>
<html>
<title>CompareValidator控制項樣本</title>
<head>
    <script language="VB" runat="server">
        Sub Button1_OnSubmit(sender As Object, e As EventArgs)
            If Page.IsValid Then
               lblOutput.Text = "比較正確!"
            Else
               lblOutput.Text = "比較不正確!"
            End If
        End Sub
        Sub lstOperator_SelectedIndexChanged(sender As Object, e As EventArgs)
            comp1.Operator = lstOperator.SelectedIndex
            comp1.Validate
        End Sub
   </script>
</head>
<body>
<center>
    <h3><font face="Verdana">CompareValidator控制項樣本</font></h3>
    <form runat=server>
      <table bgcolor="#eeeeee" cellpadding=10>
      <tr valign="top">
        <td>
            <h5><font face="Verdana">字串 1:</font></h5>
            <asp:TextBox Selected id="txtComp" runat="server"></asp:TextBox>
        </td>
        <td>
            <h5><font face="Verdana">比較子:</font></h5>
            <asp:ListBox id="lstOperator" OnSelectedIndexChanged="lstOperator_SelectedIndexChanged" runat="server">
                    <asp:ListItem Selected Value="Equal" >=</asp:ListItem>
                    <asp:ListItem Value="NotEqual" ><></asp:ListItem>
                    <asp:ListItem Value="GreaterThan" >></asp:ListItem>
                    <asp:ListItem Value="GreaterThanEqual" >>=</asp:ListItem>
                    <asp:ListItem Value="LessThan" ><</asp:ListItem>
                    <asp:ListItem Value="LessThanEqual" >=<</asp:ListItem>
            </asp:ListBox>
        </td>
        <td>
            <h5><font face="Verdana">字串 2:</font></h5>
            <asp:TextBox id="txtCompTo" runat="server"></asp:TextBox><p>
            <asp:Button runat=server Text="驗證" ID="Button1" onclick="Button1_OnSubmit" />
        </td>
      </tr>
      </table>
      <asp:CompareValidator id="comp1" ControlToValidate="txtComp" ControlToCompare = "txtCompTo" Type="String" runat="server"/>
      <br>
     <asp:Label ID="lblOutput" Font-Name="verdana" Font-Size="10pt" runat="server"/>
    </form>
</center>
</body>
</html>
    在上面的代碼中,我們實現了對兩個控制項的值進行比較。


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