vuejs组件交互 - 01 - 父子组件之间的数据交互

父子组件之间的数据交互遵循：

1. props down - 子组件通过props接受父组件的数据
2. events up - 父组件监听子组件$emit的事件来操作数据

示例

子组件的点击事件函数中$emit自定义事件

export default {
  name: 'comment',
  props: ['issue','index'],
  data () {
    return {
      comment: '',
    }
  },
  components: {},
  methods: {
    removeComment: function(index,cindex) {
      this.$emit('removeComment', {index:index, cindex:cindex});
    },
    saveComment: function(index) {
      this.$emit('saveComment', {index: index, comment: this.comment});
      this.comment="";
    }
  },
  //hook 
  created: function  () {
    //get init data

  }

}

父组件监听事件

<comment v-show="issue.show_comments" :issue="issue" :index="index" @removeComment="removeComment" @saveComment="saveComment"></comment>

父组件的methods中定义了事件处理程序

    removeComment: function(data) {
      var index = data.index, cindex = data.cindex;
      var issue = this.issue_list[index];
      var comment = issue.comments[cindex];
      axios.get('comment/delete/cid/'+comment.cid)
      .then(function  (resp) {
        issue.comments.splice(cindex,1);
      });
    },
    saveComment: function(data) {
      var index = data.index;
      var comment = data.comment;
      var that = this;
      var issue =that.issue_list[index];
      var data = {
        iid: issue.issue_id,
        content: comment
      };

      axios.post('comment/save/',data)
      .then(function  (resp) {
        issue.comments=issue.comments||[];
        issue.comments.push({
          cid: resp.data,
          content: comment
        });
      });
      
      //clear comment input
      this.comment="";
    }

  },

注意多参数的传递是一个对象

其实还有更多的场景需要组件间通信

官方推荐的通信方式

1. 首选使用Vuex
2. 使用事件总线:eventBus,允许组件自由交流
3. 具体可见：https://cn.vuejs.org/v2/guide/migration.html#dispatch-和-broadcast-替换