小程序开发基础篇之数据绑定下（8）

//.wxml
<view wx:for="{{array}}">
  {{index}}: {{item.message}}
</view>

//.js
age({
  data: {
    array: [{
      message: 'foo',
    }, {
      message: 'bar'
    }]
  }
})

<view wx:for="{{array}}" wx:for-index="idx" wx:for-item="itemName">
  {{idx}}: {{itemName.message}}
</view>

<view wx:for="{{[1, 2, 3, 4, 5, 6, 7, 8, 9]}}" wx:for-item="i">
  <view wx:for="{{[1, 2, 3, 4, 5, 6, 7, 8, 9]}}" wx:for-item="j">
    <view wx:if="{{i <= j}}">
      {{i}} * {{j}} = {{i * j}}
    </view>
  </view>
</view>

<block wx:for="{{[1, 2, 3]}}">
  <view> {{index}}: </view>
  <view> {{item}} </view>
</block>

//.wxml
<checkbox wx:for="{{objectArray}}" value="{{item.name}}" style="display: block;"> {{item.name}} </checkbox>
<button bindtap="addToFront">在上方添加一个新的check组件</button>

//.js
Page({
  data: {
    objectArray: [
      {id: 1, name: '我没有被选中'},
      {id: 2, name: '我没有被选中'},
    ],
  },

  addToFront: function(e) {
    const length = this.data.objectArray.length
    this.data.objectArray = [{id: length, name: '我没有被选中'}].concat(this.data.objectArray)
    this.setData({
      objectArray: this.data.objectArray
    })
  },
})

//wxml
<checkbox-group bindchange="checkboxChange">
  <checkbox wx:for="{{objectArray}}" value="{{item.id}}" style="display: block;" > {{item.name}} 
  </checkbox>
</checkbox-group>

<button bindtap="addToFront">在上方添加一个新的check组件</button>

//js
Page({
  data: {
    objectArray: [
      {id: 1, name: '我没有被选中'},
      {id: 2, name: '我没有被选中'},
    ],
  },

  addToFront: function(e) {
    const length = this.data.objectArray.length
    this.data.objectArray = [{id: length + 1, name: '我没有被选中'}].concat(this.data.objectArray)
    this.setData({
      objectArray: this.data.objectArray
    })
  },
  checkboxChange: function(e){
    console.log('checkboxChange')
    const length = this.data.objectArray.length
    let checkBoxArray = this.data.objectArray
    for (let i = 0; i < length; i++) {
       let ischecked = false
       for (let j = 0; j < e.detail.value.length; j++){
          if (checkBoxArray[i].id == e.detail.value[j]){
              checkBoxArray[i].name = '我被选中了'
              ischecked = true
          }
       }
       if (!ischecked){
         checkBoxArray[i].name = '我没有被选中'
       }
    }
    this.setData({
      objectArray: this.data.objectArray
    })
  }
})

<checkbox-group bindchange="checkboxChange">
  <checkbox wx:for="{{objectArray}}" wx:key = "id" value="{{item.id}}" style="display: block;" > {{item.name}} 
  </checkbox>
</checkbox-group>

<button bindtap="addToFront">在上方添加一个新的check组件</button>