Angular 1.5 Component:传递一个函数

Question

是否可以将函数传递给组件并在传递参数的组件内调用此函数？

例:

帖子列表

<post-list posts="blog.posts"
           loading="blog.loadingPosts"
           get-post-url="blog.getPostUrl" 
           is-user-authenticate="blog.user">
</post-list>

getPostUrl是一个函数(在容器控制器内):

const getPostUrl = (postId) => {
    const protocol = $location.protocol();
    const host = $location.host();
    const port = $location.port();

    return protocol + "://" + host + "" + (port !== 80 ? ":" + port : "") + "/blog/post/" + postId;
};

帖子列表:组件

const PostList = {
  "bindings": {
    "posts": "<",
    "loading": "<",
    "getPostUrl": "&", //Function getPostUrl
    "isUserAuthenticate": "<"
  },
  "template": `<div>
                <div class="col-md-9 text-center" data-ng-if="$ctrl.loading">
                  <i class="fa fa-spinner fa-spin fa-2x"></i>
                </div>

                <div class="col-md-9 posts" data-ng-if="!$ctrl.loading">
                  <div data-ng-repeat="post in $ctrl.posts">
                    <post creation-date="{{post.creationDate}}"
                          content="{{post.content}}"
                          post-url="{{$ctrl.getPostUrl(post.creationDate)}}"
                          is-user-authenticate="$ctrl.user">
                    </post>
                  </div>
                </div>
              </div>`,
   "transclude": false
};

 angular
  .module("blog")
  .component("postList", PostList);

在这一行:

post-url="{{$ctrl.getPostUrl(post.creationDate)}}"我想调用传递参数的函数,这个函数返回一个字符串.

在post组件(不是PostList)中,postUrl是一个字符串属性@.

但是......不工作!

angular.js:13550错误:[$ interpolate:interr]无法插值:{{$ ctrl.getPostUrl(post.creationDate)}} TypeError:无法使用'in'运算符在1459329888892中搜索'blog' 错误链接

有可能吗？如何？

非常感谢!

Answer 1

您可以将函数传递给组件,但必须将函数参数定义为对象,并将正确的参数名称作为其键.例:

<post-list posts="blog.posts"
           loading="blog.loadingPosts"
           get-post-url="blog.getPostUrl(postId)" 
           is-user-authenticate="blog.user">
</post-list>

const PostList = {
 "bindings": {
  "posts": "<",
  "loading": "<",
  "getPostUrl": "&", //Function getPostUrl
  "isUserAuthenticate": "<"
 },
 "template": `<post creation-date="{{post.creationDate}}"
                      content="{{post.content}}"
                      post-url="{{$ctrl.getPostUrl({postId:post.creationDate})}}">
                </post>

Answer 2

如果要从组件内部调用该函数并让它返回一个值,那么您需要双向绑定:

"bindings": {
  "posts": "<",
  "loading": "<",
  "getPostUrl": "=", // <-- two-way binding
  "isUserAuthenticate": "<"
},

但是,这可能不是一个好主意.考虑将数据传递给组件,而不是从外部发出组件请求数据.这将使更好的隔离组件.