驗證控制項介紹--RangeValidator

來源:互聯網
上載者:User
控制項 RangeValidator控制項主要界定輸入的值的範圍。因為有時我們要求輸入的值是要有一定範圍的,所以我們要使用RangeValidator來判斷。
在下面的這個例子中,我們將來介紹RangeValidator控制項。
請看validata5.aspx的程式內容:
<!--源檔案:form\web頁面簡介\validate5.aspx-->
<%@ Page clienttarget=downlevel %>
<html>
<center>
<title>RangeValidator控制項示範</title>
<head>
    <script language="VB" runat="server">
        Sub Button1_Click(sender As Object, e As EventArgs)
           If (Page.IsValid) Then
              lblOutput.Text = "結果正確!"
           Else
              lblOutput.Text = "結果不正確!"
           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控制項示範</font></h3>
    <p>
    <form runat="server">
      <table bgcolor="#eeeeee" cellpadding=10>
      <tr valign="top">
        <td>
            <h5><font face="Verdana">輸入要驗證的值:</font></h5>
            <asp:TextBox Selected id="txtComp" runat="server"/>
        </td>
        <td>
            <h5><font face="Verdana">資料類型:</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="驗證" 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>
當我們在三個文字框中分別輸入要驗證的值,最大值,和最小值,然後按下驗證按鈕,頁面上將顯示判斷的結果。


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