Angular - 无法使 ng-repeat orderBy 工作答案

【问题标题】：Angular - Can't make ng-repeat orderBy workAngular - 无法使 ng-repeat orderBy 工作
【发布时间】：2013-10-23 15:08:43
【问题描述】：

我用 orderBy 尝试了很多 ng-repeat 的例子，但我无法让我的 json 使用它。

<div ng-app>
    <script type="text/javascript" src="http://code.angularjs.org/1.0.1/angular-1.0.1.js"></script>
    <div ng:controller="Main">
        <div ng-repeat="release in releases| orderBy:'environment_id'">      
            {{release.environment_id}}
        </div>
    </div>
</div>

还有 JSON

function Main($scope) {
$scope.releases = {
    "tvl-c-wbap001 + tvl-webapp": {
        "timestamp": " 05:05:53 PM ",
        "environment_id": "CERT5",
        "release_header": "Projects/Dev",
        "date": "19 Oct",
        "release": "12.11.91-1"
    },
    "tvl-c-wbap401 + tvl-webapp": {
        "timestamp": " 10:07:25 AM ",
        "environment_id": "CERT4",
        "release_header": "Future Release",
        "date": "15 Oct",
        "release": "485-1"
    },
    "tvl-c-wbap301 + tvl-webapp": {
        "timestamp": " 07:59:48 AM ",
        "environment_id": "CERT3",
        "release_header": "Next Release",
        "date": "15 Oct",
        "release": "485-1"
    },
    "tvl-c-wbap201 + tvl-webapp": {
        "timestamp": " 03:34:07 AM ",
        "environment_id": "CERT2",
        "release_header": "Next Changes",
        "date": "15 Oct",
        "release": "13.12.3-1"
    },
    "tvl-c-wbap101 + tvl-webapp": {
        "timestamp": " 12:44:23 AM ",
        "environment_id": "CERT1",
        "release_header": "Production Mirror",
        "date": "15 Oct",
        "release": "13.11.309-1"
    },
    "tvl-s-wbap002 + tvl-webapp": {
        "timestamp": " 12:43:23 AM ",
        "environment_id": "Stage2",
        "date": "15 Oct",
        "release": "13.11.310-1"
    },
    "tvl-s-wbap001 + tvl-webapp": {
        "timestamp": " 11:07:38 AM ",
        "environment_id": "Stage1",
        "release_header": "Production Mirror",
        "date": "11 Oct",
        "release": "13.11.310-1"
    },
    "tvl-p-wbap001 + tvl-webapp": {
        "timestamp": " 11:39:25 PM ",
        "environment_id": "Production",
        "release_header": "Pilots",
        "date": "14 Oct",
        "release": "13.11.310-1"
    },
    "tvl-p-wbap100 + tvl-webapp": {
        "timestamp": " 03:27:53 AM ",
        "environment_id": "Production",
        "release_header": "Non Pilots",
        "date": "11 Oct",
        "release": "13.11.309-1"
    }
}

不管我写什么，我总是得到相同的订单，或者我可能会说，根本没有订单。

【问题讨论】：

标签： javascript json angularjs angularjs-ng-repeat

【解决方案1】：

orderBy 仅适用于数组 -- 请参阅 http://docs.angularjs.org/api/ng.filter:orderBy

也是一个很好的过滤器，用于对象而不是数组@Angularjs OrderBy on ng-repeat doesn't work

【讨论】：

我有一个数组，但这在 Chrome 中不起作用。你知道为什么吗？

【解决方案2】：

您将不得不将您的发布对象重新格式化为对象的数组。然后您就可以按照您尝试的方式对它们进行排序。

【讨论】：

【解决方案3】：

如前所述，只允许使用数组。但是为了简单起见，您可以通过管道函数将对象动态转换为数组，如此处所示 https://gist.github.com/brev/3949705

只需声明过滤器，并将其添加到 ng-repeat :)

<div ng-app="myApp">
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/angularjs/1.0.8/angular.min.js"></script>
<div ng-controller="Main">
  <div ng-repeat="release in releases | object2Array | orderBy:'environment_id'">{{release.environment_id}}</div>
</div>

<script>

var app = angular.module('myApp', []).filter('object2Array', function() {
    return function(input) {
      var out = []; 
      for(i in input){
        out.push(input[i]);
      }
      return out;
    }
  })
.controller('Main',function ($scope) {
        $scope.releases = {"tvl-c-wbap001 + tvl-webapp":{"timestamp":" 05:05:53 PM ","environment_id":"CERT5","release_header":"Projects/Dev","date":"19 Oct","release":"12.11.91-1"},"tvl-c-wbap401 + tvl-webapp":{"timestamp":" 10:07:25 AM ","environment_id":"CERT4","release_header":"Future Release","date":"15 Oct","release":"485-1"},"tvl-c-wbap301 + tvl-webapp":{"timestamp":" 07:59:48 AM ","environment_id":"CERT3","release_header":"Next Release","date":"15 Oct","release":"485-1"},"tvl-c-wbap201 + tvl-webapp":{"timestamp":" 03:34:07 AM ","environment_id":"CERT2","release_header":"Next Changes","date":"15 Oct","release":"13.12.3-1"},"tvl-c-wbap101 + tvl-webapp":{"timestamp":" 12:44:23 AM ","environment_id":"CERT1","release_header":"Production Mirror","date":"15 Oct","release":"13.11.309-1"},"tvl-s-wbap002 + tvl-webapp":{"timestamp":" 12:43:23 AM ","environment_id":"Stage2","date":"15 Oct","release":"13.11.310-1"},"tvl-s-wbap001 + tvl-webapp":{"timestamp":" 11:07:38 AM ","environment_id":"Stage1","release_header":"Production Mirror","date":"11 Oct","release":"13.11.310-1"},"tvl-p-wbap001 + tvl-webapp":{"timestamp":" 11:39:25 PM ","environment_id":"Production","release_header":"Pilots","date":"14 Oct","release":"13.11.310-1"},"tvl-p-wbap100 + tvl-webapp":{"timestamp":" 03:27:53 AM ","environment_id":"Production","release_header":"Non Pilots","date":"11 Oct","release":"13.11.309-1"}}
    });
</script>

【讨论】：

我使用更简单的toArray 过滤器：function(obj){return Object.keys(obj).map(function(key){return obj[key];});}
太棒了……太棒了。感谢您发布此信息。大有帮助！
我不确定过滤器是否会发生这种情况，但是如果您使用函数在每个排序上创建一个数组，则 $digest 会多次触发。谁能告诉这是否也使用过滤器发生？见docs.angularjs.org/error/$rootScope/infdig
难道现在orderBy不仅支持数组吗？ De doc 链接声明：“还支持类似数组的值（例如 NodeLists、jQuery 对象、TypedArrays、字符串等）。”

【解决方案4】：

在上面 Eike Thies 的回复中，如果我们使用 underscore.js，过滤器可以简化为：

var app = angular.module('myApp', []).filter('object2Array', function() {
  return function(input) {
    return _.toArray(input);
  }
});

【讨论】：

迄今为止最好的答案！太棒了。

【解决方案5】：

迭代对象时，内置 orderBy 过滤器将不再起作用。由于对象字段的存储方式，它被忽略了。您需要创建一个自定义过滤器

yourApp.filter('orderObjectBy', 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;
  };
});

<ul>
<li ng-repeat="item in items | orderObjectBy:'color':true">{{ item.color }}</li>
</ul>

【讨论】：

【解决方案6】：

这是@Julian Mosquera 的代码的一个版本，它也支持按对象key排序：

yourApp.filter('orderObjectBy', function () {
    return function (items, field, reverse) {
        // Build array
        var filtered = [];
        for (var key in items) {
            if (field === 'key')
                filtered.push(key);
            else
                filtered.push(items[key]);
        }
        // Sort array
        filtered.sort(function (a, b) {
            if (field === 'key')
                return (a > b ? 1 : -1);
            else
                return (a[field] > b[field] ? 1 : -1);
        });
        // Reverse array
        if (reverse)
            filtered.reverse();
        return filtered;
    };
});

【讨论】：

【解决方案7】：

orderby 适用于包含具有可用作过滤器的即时值的对象的数组，即

controller.images = [{favs:1,name:"something"},{favs:0,name:"something else"}];

当上述数组重复时，可以使用 | orderBy:'favs' 直接引用该值，或在前面使用减号以降序

<div class="timeline-image" ng-repeat="image in controller.images | orderBy:'-favs'">
    <img ng-src="{{ images.name }}"/>
</div>

【讨论】：

【解决方案8】：

这是@Julian Mosquera 的代码的一个版本，它还支持在主字段为空或未定义的情况下使用“后备”字段：

yourApp.filter('orderObjectBy', function() {
  return function(items, field, fallback, reverse) {
    var filtered = [];
    angular.forEach(items, function(item) {
      filtered.push(item);
    });
    filtered.sort(function (a, b) {
      var af = a[field];
      if(af === undefined || af === null) { af = a[fallback]; }

      var bf = b[field];
      if(bf === undefined || bf === null) { bf = b[fallback]; }

      return (af > bf ? 1 : -1);
    });
    if(reverse) filtered.reverse();
    return filtered;
  };
});

【讨论】：