解析只有DateJS的时间字符串 [英] Parse ONLY a time string with DateJS

问题描述

我正在使用优秀的（但较大的） DateJS 库来处理我的webapp中的日期和时间。我刚刚遇到了一些我不知道如何处理的东西。

I'm using the excellent (but large) DateJS library to handle dates and times in my webapp. I just came across something that I'm not sure how to handle.

我希望我的用户只能输入时间字符串，而不用日期，但应该能够以任何方式输入。例如：

I want my users to be able to enter Time strings only, without a date, but they should be able to enter it in any manner they please. For instance:

• 5:00 pm


• 17:00


• 5:00 pm


• 5：00p


• 5p


• 等。
  

• 5:00 pm
• 17:00
• 5:00pm
• 5:00p
• 5p
• etc.

使用 Date.parse（value）将这些字符串转换为完整日期，我想要的是。但是，它也允许用户输入日期字符串的任何其他部分，例如：

Using Date.parse(value) converts these strings into a full date, which is exactly what I want. However, it also allows the user to enter any other part of a date string, such as:

• sat 5pm


• 1/1/2010 5pm


• 等。

尝试使用DateJS验证时间值的输入字段。一些东西：

I'm trying to use DateJS to validate an input field for a time value. Something like:

function validateTime(value) {
    return Date.parse(value) !== null;
}

有没有办法使用DateJS功能来解决这个问题？还有其他 SO问题提供解决方案，但是如果DateJS有办法做到这一点，我真的不想在我的应用程序中添加更多的自定义代码来执行此操作。

Is there a way to use DateJS features to solve this? There are other SO questions that provide solutions, but if DateJS has a way to do this, I don't really want to add more custom code to my app to do this.

推荐答案

在提出问题后不久，我发现Date.parseExact（）可以使用一个格式字符串数组。不知怎的，我错过了我设法使用以下代码：

Shortly after asking my question, I discovered that Date.parseExact() can take an array of format strings. Somehow I'm missed that. I managed to get something working with the following code:

function validateTime(input) {
    return Date.parseExact(input, [
            "H:m",
            "h:mt",
            "h:m t",
            "ht","h t"]) != null ||
        Date.parseExact(input, [
            "h:mtt",
            "h:m tt",
            "htt","h tt"]) != null;
};

请注意，某些格式似乎无法同时包含在一起，是为什么我将它们分成两个单独的parseExact（）调用。在这种情况下，我不能包含包含单个 t 的任何字符串，其格式字符串包含双重 tt 中。

Note that some formats don't seem to be able to be included together at the same time, which is why I split them into two separate parseExact() calls. In this case, I couldn't include any string that contained a single t in it with format strings that contained a double tt in it.

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