TextBox控件只允许输入出生日期，并验证年龄不得小于18岁

1.Body tag

<form id="form1" runat="server">

    <div>

      <asp:Label ID="lblDob" runat="server" Text="Date of Birth :"></asp:Label>

      <asp:TextBox ID="txtDob" runat="server" onblur="Validate();"></asp:TextBox><asp:Label ID="Label3" runat="server" Text="(mm/dd/yyyy)"></asp:Label>

        <asp:RegularExpressionValidator ID="dateValRegex" runat="server" ControlToValidate="txtDob"

            ErrorMessage="*Please Enter a valid date in the format (mm/dd/yyyy)" ValidationExpression="^(0[1-9]|1[012])[- /.](0[1-9]|[12][0-9]|3[01])[- /.](19|20)\d\d$"

            ForeColor="Red"></asp:RegularExpressionValidator>

    </div>

    </form>

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2.JavaScript 代码

 <script>

        function Validate() {

                var enteredValue = document.getElementById('<%=txtDob.ClientID %>');

                var enteredAge = getAge(enteredValue.value);

                if (enteredAge < 18) {

                    alert("you are too young");

                    enteredValue.focus();

                    return false;

                }

            }

            function getAge(DOB) {

                var today = new Date();

                var birthDate = new Date(DOB);

                var age = today.getFullYear() - birthDate.getFullYear();

                var m = today.getMonth() - birthDate.getMonth();

                if (m < 0 || (m === 0 && today.getDate() < birthDate.getDate())) {

                    age--;

                }

                return age;

            }



        </script>

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