Linq.JS 具有空值的 OrderBy

Question

我想按日期排序我的数据，但有些日期值是空的。我将如何对数据进行排序并使空值一起出现在降序列表的末尾和升序列表的开头？

Javascript:

var data = [
    {"n": "Adams","v": null},
    {"n": "Anderson","v": "2015-05-30T15:07:00.0000000"},
    {"n": "Armstrong","v": "2015-06-06T02:09:00.0000000"},
    {"n": "Cooper","v": "2015-06-06T02:12:00.0000000"},
    {"n": "House","v": "2015-06-12T12:33:00.0000000"},
    {"n": "Lee","v": "2015-06-06T00:59:00.0000000"},
    {"n": "Marmol","v": "2015-06-06T23:22:00.0000000"},
    {"n": "Maronde","v": "2015-06-06T16:46:00.0000000"},
    {"n": "Molleken","v": "2015-06-06T16:51:00.0000000"},
    {"n": "Murata","v": "2015-06-06T23:20:00.0000000"},
    {"n": "Price","v": null},
    {"n": "Roth","v": "2015-06-07T14:00:00.0000000"},
    {"n": "Soto","v": "2015-06-06T23:46:00.0000000"}
];

var enu = $.Enumerable.From(data)
    .OrderBy('$.v')
    .Select()
    .ToArray();
var vue = new Vue({
    el: 'ul',
    data: {
        title: 'test',
        test: enu
    }
});

HTML:

<ul>
    <li v-repeat="test">{{v}}</li>
</ul>

输出：

null
2015-05-30T15:07:00.0000000
2015-06-06T00:59:00.0000000
2015-06-06T02:09:00.0000000
2015-06-06T02:12:00.0000000
2015-06-06T16:46:00.0000000
2015-06-06T16:51:00.0000000
2015-06-06T23:20:00.0000000
2015-06-06T23:22:00.0000000
2015-06-06T23:46:00.0000000
2015-06-12T12:33:00.0000000
null
2015-06-07T14:00:00.0000000

看我的fiddle：https://jsfiddle.net/6pcmq89h/

您可以看到空项是如何分隔日期的，我不确定为什么会这样。有人可以帮忙吗？

编辑：该解决方案不能有任何硬编码，因为我将在单击 header 标题时动态更改要排序的列。无论数据类型如何，空值问题都应该起作用。只要有空值，我就需要将它们组合在一起。

谢谢！

Answer 1

只需为空的情况添加一个占位符值。由于您按降序排序并且最后想要它，因此请给它们尽可能小的值。您可能想在之后添加一个 thenby 子句。

var enu = $.Enumerable.From(data)
    .OrderByDescending("$.v || '0000'")
    .ThenBy("$.n")
    .ToArray();

fiddle

Linq.JS 具有空值的 OrderBy

Linq.JS OrderBy with null values

javascript

linq.js

vue.js