te')); return $arr; } /* 遍历用户所有主题 * @param $uid 用户ID * @param int $page 页数 * @param int $pagesize 每页记录条数 * @param bool $desc 排序方式 TRUE降序 FALSE升序 * @param string $key 返回的数组用那一列的值作为 key * @param array $col 查询哪些列 */ function thread_tid_find_by_uid($uid, $page = 1, $pagesize = 1000, $desc = TRUE, $key = 'tid', $col = array()) { if (empty($uid)) return array(); $orderby = TRUE == $desc ? -1 : 1; $arr = thread_tid__find($cond = array('uid' => $uid), array('tid' => $orderby), $page, $pagesize, $key, $col); return $arr; } // 遍历栏目下tid 支持数组 $fid = array(1,2,3) function thread_tid_find_by_fid($fid, $page = 1, $pagesize = 1000, $desc = TRUE) { if (empty($fid)) return array(); $orderby = TRUE == $desc ? -1 : 1; $arr = thread_tid__find($cond = array('fid' => $fid), array('tid' => $orderby), $page, $pagesize, 'tid', array('tid', 'verify_date')); return $arr; } function thread_tid_delete($tid) { if (empty($tid)) return FALSE; $r = thread_tid__delete(array('tid' => $tid)); return $r; } function thread_tid_count() { $n = thread_tid__count(); return $n; } // 统计用户主题数 大数量下严谨使用非主键统计 function thread_uid_count($uid) { $n = thread_tid__count(array('uid' => $uid)); return $n; } // 统计栏目主题数 大数量下严谨使用非主键统计 function thread_fid_count($fid) { $n = thread_tid__count(array('fid' => $fid)); return $n; } ?>javascript - How to track nested object in a MobX store - Stack Overflow

科技改变生活-雨落星辰 - 所有的伟大,都源于一个勇敢的开始

    最新消息：雨落星辰是一个专注网站SEO优化、网站SEO诊断、搜索引擎研究、网络营销推广、网站策划运营及站长类的自媒体原创博客
    你的位置： 首页>programmer>javascript - How to track nested object in a MobX store - Stack Overflow

    javascript - How to track nested object in a MobX store - Stack Overflow

    programmeradmin3浏览0评论

    Let's stay I have this myObject loaded via an API call:

    myObject = {
  fieldA: { details: 'OK', message: 'HELLO' },
  fieldB: { details: 'NOT_OK', message: 'ERROR' },
}

    Only details and message of each field can change. I want this object to be observable in a MobX store (which properties? to be defined below). I have a simple React ponent which reads the two fields from the store:

    @observer
class App extends Component {
  store = new Store();

  ponentWillMount() {
    this.store.load();
  }

  render() {
    return (
      <div>
        {this.store.fieldA && <p>{this.store.fieldA.details}</p>}
        {this.store.fieldB && <p>{this.store.fieldB.details}</p>}
      </div>
    );
  }
}

    I read this page trying to understand what MobX reacts to, but still didn't get a clear idea. Specifically, which of the 4 stores below would work, and why?

    1/

    class Store1 = {
  @observable myObject = {};

  @action setMyObject = object => {
    this.myObject = object;
  }

  load = () => someAsyncStuff().then(this.setMyObject);
}

    2/

    class Store2 = {
  @observable myObject = {};

  @action setMyObject = object => {
    this.myObject.fieldA = object.fieldA;
    this.myObject.fieldB = object.fieldB;
  }

  load = () => someAsyncStuff().then(this.setMyObject);
}

    3/

    class Store3 = {
  @observable myObject = { fieldA: {}, fieldB: {} };

  @action setMyObject = object => {
    this.myObject = object;
  }

  load = () => someAsyncStuff().then(this.setMyObject);
}

    4/

    class Store4 = {
  @observable myObject = { fieldA: {}, fieldB: {} };

  @action setMyObject = object => {
    this.myObject.fieldA = object.fieldA;
    this.myObject.fieldB = object.fieldB;
  }

  load = () => someAsyncStuff().then(this.setMyObject);
}

    Let's stay I have this myObject loaded via an API call:

    myObject = {
  fieldA: { details: 'OK', message: 'HELLO' },
  fieldB: { details: 'NOT_OK', message: 'ERROR' },
}

    Only details and message of each field can change. I want this object to be observable in a MobX store (which properties? to be defined below). I have a simple React ponent which reads the two fields from the store:

    @observer
class App extends Component {
  store = new Store();

  ponentWillMount() {
    this.store.load();
  }

  render() {
    return (
      <div>
        {this.store.fieldA && <p>{this.store.fieldA.details}</p>}
        {this.store.fieldB && <p>{this.store.fieldB.details}</p>}
      </div>
    );
  }
}

    I read this page trying to understand what MobX reacts to, but still didn't get a clear idea. Specifically, which of the 4 stores below would work, and why?

    1/

    class Store1 = {
  @observable myObject = {};

  @action setMyObject = object => {
    this.myObject = object;
  }

  load = () => someAsyncStuff().then(this.setMyObject);
}

    2/

    class Store2 = {
  @observable myObject = {};

  @action setMyObject = object => {
    this.myObject.fieldA = object.fieldA;
    this.myObject.fieldB = object.fieldB;
  }

  load = () => someAsyncStuff().then(this.setMyObject);
}

    3/

    class Store3 = {
  @observable myObject = { fieldA: {}, fieldB: {} };

  @action setMyObject = object => {
    this.myObject = object;
  }

  load = () => someAsyncStuff().then(this.setMyObject);
}

    4/

    class Store4 = {
  @observable myObject = { fieldA: {}, fieldB: {} };

  @action setMyObject = object => {
    this.myObject.fieldA = object.fieldA;
    this.myObject.fieldB = object.fieldB;
  }

  load = () => someAsyncStuff().then(this.setMyObject);
}
    • javascript
    • mobx
    • mobx-react
    Share Improve this question edited Jun 24, 2019 at 11:42 Brian Burns 22k10 gold badges92 silver badges79 bronze badges asked Dec 22, 2017 at 10:34 jeanpaul62jeanpaul62 10.6k15 gold badges60 silver badges101 bronze badges
    Add a ment  | 

    1 Answer 1

    Reset to default 12

    All of the above will work, except for solution 2. That because as described in Mobx docs about objects:

    When passing objects through observable, only the properties that exist at the time of making the object observable will be observable. Properties that are added to the object at a later time won't bee observable, unless extendObservable is used.

    In the first solution you re-assign the object again with the properties already exist in the returned object. In 3 and 4 you initialized the object with those 2 properties so it works.

    Also I think in your ponent example you meant to use it like this (otherwise, it won't work in any way):

    render() {
    const { myObject } = this.store;

    return (
      <div>
        {myObject && myObject.fieldA && <p>{myObject.fieldA.details}</p>}
        {myObject && myObject.fieldB && <p>{myObject.fieldB.details}</p>}
      </div>
    );
}

    与本文相关的文章

    发布评论

    评论列表(0)

    1. 暂无评论