【愚公系列】2022年02月 微信小程序-Component组件的关系

{
  "usingComponents": {
    "custom-ul": "/components/custom-ul-component",
    "custom-li": "/components/custom-li-component"
  }
}

<custom-ul>
  <custom-li> item 1 </custom-li>
  <custom-li> item 2 </custom-li>
</custom-ul>

// path/to/custom-ul.js
Component({
  relations: {
    './custom-li-component': {
      type: 'child', // 关联的目标节点应为子节点
      linked: function (target) {
        // 每次有custom-li被插入时执行，target是该节点实例对象，触发在该节点attached生命周期之后
        console.log('[custom-ul] a child is linked: ', target)
      },
      linkChanged: function (target) {
        // 每次有custom-li被移动后执行，target是该节点实例对象，触发在该节点moved生命周期之后
      },
      unlinked: function (target) {
        // 每次有custom-li被移除时执行，target是该节点实例对象，触发在该节点detached生命周期之后
      }
    }
  },
  methods: {
    _getAllLi: function () {
      // 使用getRelationNodes可以获得nodes数组，包含所有已关联的custom-li，且是有序的
      var nodes = this.getRelationNodes('./custom-li-component')
      console.log(nodes)
    }
  },
  ready: function () {
    this._getAllLi()
  }
})

<!-- 组件模板 -->
<view class="wrapper">
  <slot></slot>
</view>

// path/to/custom-li.js
Component({
  relations: {
    './custom-ul-component': {
      type: 'parent', // 关联的目标节点应为父节点
      linked: function (target) {
        // 每次被插入到custom-ul时执行，target是custom-ul节点实例对象，触发在attached生命周期之后
        console.log('child linked to ', target)
      },
      linkChanged: function (target) {
        // 每次被移动后执行，target是custom-ul节点实例对象，触发在moved生命周期之后
      },
      unlinked: function (target) {
        // 每次被移除时执行，target是custom-ul节点实例对象，触发在detached生命周期之后
      }
    }
  }
})

<text> li </text>

{
  "usingComponents": {
    "custom-input": "../components/custom-input",
    "custom-submit": "../components/custom-submit",
    "custom-form": "../components/custom-form"
  }
}

<custom-form>
  <view>
    input
    <custom-input></custom-input>
  </view>
  <custom-submit> submit </custom-submit>
</custom-form>

// path/to/custom-form-controls.js
module.exports = Behavior({
  // ...
})

var customFormControls = require('./custom-form-controls')
Component({
  relations: {
    'customFormControls': {
      type: 'descendant', // 关联的目标节点应为子孙节点
      target: customFormControls,
      linked: function(target) {
        console.info('已关联到 ' + target.is)
      }
    }
  }
})

// path/to/custom-input.js
var customFormControls = require('./custom-form-controls')
Component({
  behaviors: [customFormControls],
  relations: {
    './custom-form': {
      type: 'ancestor', // 关联的目标节点应为祖先节点
    }
  }
})

// path/to/custom-submit.js
var customFormControls = require('./custom-form-controls')
Component({
  behaviors: [customFormControls],
  relations: {
    './custom-form': {
      type: 'ancestor', // 关联的目标节点应为祖先节点
    }
  }
})