Angular orderBy 对象可能吗? [英] Angular orderBy object possible?

问题描述

我有一个表示日历日期的 JSON 对象.这些是通过 CMS 添加的，我希望能够根据日期过滤它们.我的模式设置使这比我想象的更困难.是否可以在此 JSON 对象中按天排序，或者是否有过滤器解决方法?

这是我的 JSON 对象:

<代码>{"_id" : ObjectId("53f252537d343a9ad862866c"),年" : {十二月":[]，十一月" : []，十月":[]，九月" : []，八月" : []，七月" : [{天":21"，"title" : "事件标题","summary" : "事件概要","description": "o事件描述","_id" : ObjectId("53f252537d343a9ad862866d")}],六月" : []，可能" : []，四月" : []，行进" : []，二月":[]，一月" : []},__v":0}

这是我已经使用自定义过滤器按月过滤的视图.orderBy 不起作用，但我将它留作占位符以显示我想在哪里设置功能.<​​/p>

<div ng-repeat="cal in calendar[n].year | filterKey:month"><div ng-if="cal != '' "><div class="日历"><div ng-repeat="校准中的项目 | orderBy: 'key.day' "><a href="/events/{{item.day}}"><文章类=事件列表"><div class="numberedDate"><h3>{{item.day}}</h3>
<div class="calInfo"><h5>{{item.title}}</h5><p>{{item.summary}}&nbsp;<a>more</a></p>

</文章></div><!-- ng-repeat val,key --></div><!-- 日历--></div><!-- ng-if cal --></div><!-- ng-repeat cal --></div><!-- calDynamic -->

解决方案

您应该能够定义一个自定义排序函数，该函数根据对象中的任何项目进行排序.关键是在过滤函数中将对象转换为数组.

举个例子:

app.filter('orderByDayNumber', function() {返回函数(项目，字段，反向){var 过滤 = [];angular.forEach(项目，功能(项目){过滤.推(项目)；});过滤排序(函数(a，b){return (a[field] > b[field] ? 1 : -1);});如果(反向)过滤.反向()；返回过滤；};});

然后你会这样称呼它:

注意，您不应该像假设的那样编写 val.day.

查看这篇很棒的博文了解更多信息.

EDIT:事实上，看起来您的结构实际上已经是一个数组，因此虽然此技术仍然有效，但可能没有必要 - 它可能只是您添加的方式导致问题的 orderBy 参数.

I have a JSON object representing calendar dates. These are added through a CMS and I'd like to be able to filter them based on date. My schema set-up has made this more difficult than I thought. Is it possible to orderBy the day value in this JSON object or is there a filter workaround?

Here is my JSON object:

{
"_id" : ObjectId("53f252537d343a9ad862866c"),
"year" : {
    "December" : [],
    "November" : [],
    "October" : [],
    "September" : [],
    "August" : [],
    "July" : [ 
        {
            "day" : "21",
            "title" : "Event Title",
            "summary" : "Event Summary",
            "description" : "oEvent Description",
            "_id" : ObjectId("53f252537d343a9ad862866d")
        }
    ],
    "June" : [],
    "May" : [],
    "April" : [],
    "March" : [],
    "February" : [],
    "January" : []
},
"__v" : 0
}

Here is my view which already uses a custom filter to filter by month. The orderBy is not functioning but I've left it in as a placeholder to show where I'd like to set the functionality.

<div class="calDynamic" data-ng-repeat="n in [] | range:100">
<div ng-repeat="cal in calendar[n].year | filterKey:month">
  <div ng-if="cal != '' ">
    <div class="calendar">


    <div ng-repeat="item in cal | orderBy: 'key.day' ">

        <a href="/events/{{item.day}}">
          <article class="eventslist">
           <div class="numberedDate">
               <h3>{{item.day}}</h3>
            </div>
            <div class="calInfo">
               <h5>{{item.title}}</h5>
               <p>{{item.summary}}&nbsp;<a>more</a></p>
            </div>
           </article>


      </div><!-- ng-repeat val,key -->
</div><!-- calendar -->
</div><!-- ng-if cal -->
</div><!-- ng-repeat cal -->
</div><!-- calDynamic -->

解决方案

You should be able to define a custom sort function that sorts by any item in your object. The key bit is to convert the object to an array in the filter function.

Here's an example:

app.filter('orderByDayNumber', function() {
  return function(items, field, reverse) {
    var filtered = [];
    angular.forEach(items, function(item) {
      filtered.push(item);
    });
    filtered.sort(function (a, b) {
      return (a[field] > b[field] ? 1 : -1);
    });
    if(reverse) filtered.reverse();
    return filtered;
  };
});

You would then call it like this:

<div ng-repeat="(key, val) in cal | orderByDayNumber: 'day' ">

Note, you shouldn't write val.day as that is assumed.

Look at this great blog post here for more info.

EDIT: In fact, it looks like your structure is actually already an array, so while this technique will still work, it may not be necessary - it might have just been the way you were adding the parameter to orderBy that was causing issues.

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