JavaScript验证

Question

我想执行客户端验证..我想这样做，当没有输入名字时，会显示一个消息框，其中显示缺少名字和所有文本框相同..但我不能这样做：/ ..请帮忙！ ：/这是我的代码：

＆lt;％@ Page Language =“C＃”AutoEventWireup =“true”CodeBehind =“Default.aspx.cs”Inherits =“PhoneBook._Default”％＆gt;

    电话簿                    名字         

    <br />

    <label id = "LastNameLabel" Text= "First Name" > Last Name</label>
    <asp:TextBox ID="LastNameTextBox" runat="server"></asp:TextBox>
    <br />

    <label id = "HomePhoneNumberLabel" Text= "First Name" >Home PhoneNumber</label>
    <asp:TextBox ID="HomePhoneNumberTextBox" runat="server"></asp:TextBox>
    <br />

    <label id = "CellNumberLabel" Text= "First Name" >Cell PhoneNumber</label>
    <asp:TextBox ID="CellNumberTextBox" runat="server"></asp:TextBox>
    <br />

    <label id = "EmailAddressLabel" Text= "First Name" >Email Address</label>
    <asp:TextBox ID="EmailAddressTextBox" runat="server"></asp:TextBox>
    <br />

    <label id = "HomeAddressLabel" Text= "First Name" >Home Address</label>
    <asp:TextBox ID="HomeAddressTextBox" runat="server"></asp:TextBox>
    <br />

    <label id = "NICNumberLabel" Text= "First Name" >NIC Number </label>
    <asp:TextBox ID="NICNumberTextBox" runat="server"></asp:TextBox>
    <br />
    <asp:Button ID="AddButton" runat="server" Text="Add Record" 
        onclick="AddButton_Click" />

</div>
</form>
<script type="text/javascript">
if()
{
}

</script>

Answer 1

使用ASP.NET RequiredFieldValidator Control。使用ASP.NET验证字段。

more here

使用它像：

 <asp:RequiredFieldValidator id="LastNameTextBoxRequiredFieldValidator"
             ControlToValidate="LastNameTextBox"
             Display="Static"
             Text="enter text please!"
             runat="server">