javascript - 如何使用 Angular 过滤器过滤json

Question

嘿，我对 Angular 过滤器没什么问题。 我从 wordpress 导入帖子，我真的很想按标签过滤它们，比如，现在只显示标签 = ENG 的帖子，或者只显示标签 = GER 的帖子。 这就是我的 html 的样子

    <div ng-controller="ThreeMainPosts">
        <div ng-repeat="threePost in threePosts | filter : {data.data.posts[0].tags[0].slug = 'ENG'} ">
            <div three-post="threePost">
                <h1>CONTENT</h1></div>
        </div>
    </div>

Controller

myModule.controller('ThreeMainPosts', function($scope, $location, WordPressNewsService) {
var postsPerPage = 3;
var orderBy = 0;
WordPressNewsService.getPosts(postsPerPage, orderBy).then(function(data) {
    $scope.threePosts = data.data.posts;
});

}); 和 json

    { id: 312, type: "post", slug: "la-bamba-3", url: "sada2", … }
    attachments:[]
    author:{ id: 1, slug: "ds", name: "hnews", first_name: "", last_name: "", … }
    categories:[{ id: 6, slug: "ludzie", title: "Ludzie", description: "", parent: 0, post_count: 2 }]
    tags: [{ id: 32, slug: "en", title: "EN", description: "EN", post_count: 1 }]
    url:"http://xxx0.co,/?p=312"
    previous_url:"http://hirsch-news.iterative.pl/?p=306"
    status:"ok"

我尝试在 Controller 中制作过滤器，但我只能对单个元素执行此操作，例如:

if(data.data.posts[0].tags[0].slug == "ENG"){
    $scope.threePosts = data.data.posts;
}

有什么想法吗？ 祝你有美好的一天! :)

Answer 1

制作了一个快速过滤器，可以根据您的需要进行更改。希望能帮助到你。 Angular $filter Docs

这是一个 Codepen使用 Angular 内置的 $filter。

myModule
  .controller('ThreeMainPosts', function($scope, $location, WordPressNewsService, $filter) {
    var postsPerPage = 3;
    var orderBy = 0;
    var tagToSortBy = 'EN'
    WordPressNewsService.getPosts(postsPerPage, orderBy).then(function(data) {
      $scope.threePosts = $filter('postFilter')(data.data.posts, tagToSortBy);
    });
  })
  .filter('postFilter', function() {
    return function(post, tag) {
      if (post.tags.slug === tag) {
        return post;
      }
    };
  });

如果你想在模板中这样做，它会像这样。

<div ng-controller="ThreeMainPosts">
  <div ng-repeat="post in threePosts | postFilter : 'ENG' ">
    <div three-post="threePost">
      <h1>CONTENT</h1>
    </div>
  </div>
</div>