客戶端自定義驗證

Question

我有一個文本框來保存電話號碼和列出移動服務提供商的下拉列表。我試圖確保兩者都被選中。我使用客戶端驗證程序，使用驗證組進行驗證。相同的驗證組被分配到「更新」按鈕。

當我添加電話號碼並且沒有移動提供商時，反之亦然，只要控件失去焦點，就會顯示錯誤消息。但是，如果我點擊「更新」按鈕，則不會顯示錯誤，並且更新會很愉快地進行更新。看不到我做錯了什麼。文本框或下拉列表均未設置自動回覆。

function ValidateMobile(oSrc, args) { 
    var tbMobile = document.getElementById('<%=tbMobile.ClientID%>'); 
    var ddlMobileProvider = document.getElementById('<%=ddlMobileProvider.ClientID%>'); 
    args.IsValid = true; 
    var mobileNum = tbMobile.value.trim(); 
    var selectedCarrierValue = ddlMobileProvider.options[ddlMobileProvider.selectedIndex].value; 

    if ((mobileNum != "" && selectedCarrierValue == "") || (mobileNum == "" && selectedCarrierValue != "")) 
     args.IsValid = false; 
} 

<asp:TextBox runat="server" ID="tbMobile" CssClass="NormalSmall" Width="95%" /> 
<ajaxToolkit:MaskedEditExtender runat="server" ID="mtbMobile" TargetControlID="tbMobile" Mask="(999) 999-9999" /> 

<asp:DropDownList runat="server" ID="ddlMobileProvider" Width="95%" DataSourceID="odsMobileProviders" DataTextField="CARRIERNAME" DataValueField="MOBILECARRIERID" AppendDataBoundItems="true"> 
    <asp:ListItem Text="Select Mobile Provider ..." Value="" /> 
</asp:DropDownList> 

<asp:ImageButton runat="server" ID="ibUpdate" ImageUrl="~/assets/images/buttons/Update.png" OnClick="ibUpdate_Click" CausesValidation="true" ValidationGroup="vgCustInfo" /> 

<asp:CustomValidator runat="server" ID="cvMobile" ControlToValidate="tbMobile" Display="Dynamic" ValidationGroup="vgCustInfo" ClientValidationFunction="ValidateMobile" ErrorMessage="Both Carrier and Mobile Number must be specified"></asp:CustomValidator> 

Answer 1

function ValidateMobile() { 
var tbMobile = document.getElementById('<%=tbMobile.ClientID%>'); 
var ddlMobileProvider = document.getElementById('<%=ddlMobileProvider.ClientID%>'); 
args.IsValid = true; 
var mobileNum = tbMobile.value.trim(); 
var selectedCarrierValue = ddlMobileProvider.options[ddlMobileProvider.selectedIndex].value; 

if ((mobileNum != "" && selectedCarrierValue == "") || (mobileNum == "" && selectedCarrierValue != "")) 
    args.IsValid = false; 

}