从下拉列表中验证选项 [英] Validate an option from a dropdown

问题描述

我的下拉列表中有8个安全问题可供选择，其中一个是你的出生日期是什么时候

只有选择了这个选项，我才希望它能够验证并确保DOB以正确的格式输入，即08/07/1980，并在验证摘要中显示错误消息。我是否使用自定义验证器？请有人帮帮我吗？



我真的很擅长开发，所以请放轻松我:)



谢谢！



我尝试过：



<％ - < asp：RegularExpressionValidator ID =ValDOBDisplay =NoneEnableClientScript =falseErrorMessage =请输入有效的DOBrunat =serverControlToValidate =txtQ1ValidationExpression =^（ （（0 [1-9] | [12] \d | 3 [01]）\ /（0 [13578] | 1 [02]）\ /（（19 | [2-9] \d ）\d {2}））|（（0 [1-9] | [12] \d | 30）\ /（0 [13456789] | 1 [012]）\ /（（19 | [ 2-9] \d）\d {2}））|（（0 [1-9] | 1\d | 2 [0-8]）\ / 02\ /（（19 | [ 2-9] \d）\d {2}））|（29\ / 02\ /（（1 [6-9] | [2-9] \d）（0 [48] | [2468] [048] | [13579] [26]）|（（16 | [2468] [048] | [3579] [26]）00））））$> - ％>

My dropdown has 8 security question to select from, one of which is "What is your date of birth"
Only if this option is selected, I would like it to validate and make sure that DOB is entered in the correct format i.e 08/07/1980 and for the error message to display in the validation summary. Do I use a custom validator? please can someone help me?

I'm really new to development, so please go easy on me :)

Thank you!

What I have tried:

<%--<asp:RegularExpressionValidator ID="ValDOB" Display="None" EnableClientScript="false" ErrorMessage="Please enter a valid DOB" runat="server" ControlToValidate="txtQ1" ValidationExpression="^(((0[1-9]|[12]\d|3[01])\/(0[13578]|1[02])\/((19|[2-9]\d)\d{2}))|((0[1-9]|[12]\d|30)\/(0[13456789]|1[012])\/((19|[2-9]\d)\d{2}))|((0[1-9]|1\d|2[0-8])\/02\/((19|[2-9]\d)\d{2}))|(29\/02\/((1[6-9]|[2-9]\d)(0[48]|[2468][048]|[13579][26])|((16|[2468][048]|[3579][26])00))))$">--%>

推荐答案

> - ％>

">--%>

不要使用正则表达式进行日期验证 - 它太复杂了。即使没有理查德提到的格式问题，哇t将在闰年发生？正则表达式不擅长处理数据处理 - 它们是字符串处理器而不是别的。

相反，使用 Date.parse（） - JavaScript | MDN [ ^ ]通过代码。

Don't use a regex for date validation - it's far too complex. Even without the format problem Richard mentions, what is going to happen on a leap year? Regexes aren't good at coping with data processing - they are string processors and nothing else.
Instead, validate the date in Javascript using Date.parse() - JavaScript | MDN[^] via code.

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