實(shí)現(xiàn)效果圖：

用來(lái)改進(jìn)表單組件的可用性，使用for屬性找到對(duì)應(yīng)的id，或者將控件放在該標(biāo)簽下，當(dāng)點(diǎn)擊時(shí)，就會(huì)觸發(fā)對(duì)應(yīng)的控件。

for優(yōu)先級(jí)高于內(nèi)部控件，內(nèi)部有多個(gè)控件的時(shí)候默認(rèn)觸發(fā)第一個(gè)控件。

目前可以綁定的控件有：button, checkbox, radio, switch。

示例代碼：

<view class="section section_gap">
<view class="section__title">表單組件在label內(nèi)</view>
<checkbox-group class="group" bindchange="checkboxChange">
 <view class="label-1" wx:for-items="{{checkboxItems}}">
 <label>
  <checkbox hidden value="{{item.name}}" checked="{{item.checked}}"></checkbox>
  <view class="label-1__icon">
  <view class="label-1__icon-checked" style="opacity:{{item.checked ? 1: 0}}"></view>
  </view>
  <text class="label-1__text">{{item.value}}</text>
 </label>
 </view>
</checkbox-group>
</view>

<view class="section section_gap">
<view class="section__title">label用for標(biāo)識(shí)表單組件</view>
<radio-group class="group" bindchange="radioChange">
 <view class="label-2" wx:for-items="{{radioItems}}">
 <radio id="{{item.name}}" hidden value="{{item.name}}" checked="{{item.checked}}"></radio>
 <view class="label-2__icon">
  <view class="label-2__icon-checked" style="opacity:{{item.checked ? 1: 0}}"></view>
 </view>
 <label class="label-2__text" for="{{item.name}}"><text>{{item.name}}</text></label>
 </view>
</radio-group>
</view>


<view class="section section_gap">
<view class="section__title">綁定button</view>
<label class="label-3">
 <text>點(diǎn)擊這段文字，button會(huì)被選中</text>
</label>
<view class="btn-area">
 <button type="default" name="1" bindtap="tapEvent">按鈕</button>
</view>
</view>

<view class="section section_gap">
<view class="section__title">label內(nèi)有多個(gè)時(shí)選中第一個(gè)</view>
<label class="label-4">
 <checkbox> 選中我 </checkbox>
 <checkbox> 選不中 </checkbox>
 <checkbox> 選不中 </checkbox>
 <checkbox> 選不中 </checkbox>
 <view class="label-4_text">點(diǎn)我會(huì)選中第一個(gè)</view>
</label>
</view>

Page({
 data: {
 checkboxItems: [
 {name: 'USA', value: '美國(guó)'},
 {name: 'CHN', value: '中國(guó)', checked: 'true'},
 {name: 'BRA', value: '巴西'},
 {name: 'JPN', value: '日本', checked: 'true'},
 {name: 'ENG', value: '英國(guó)'},
 {name: 'TUR', value: '法國(guó)'},
 ],
 radioItems: [
 {name: 'USA', value: '美國(guó)'},
 {name: 'CHN', value: '中國(guó)', checked: 'true'},
 {name: 'BRA', value: '巴西'},
 {name: 'JPN', value: '日本'},
 {name: 'ENG', value: '英國(guó)'},
 {name: 'TUR', value: '法國(guó)'},
 ],
 hidden: false
 },
 checkboxChange: function(e) {
 var checked = e.detail.value
 var changed = {}
 for (var i = 0; i < this.data.checkboxItems.length; i ++) {
 if (checked.indexOf(this.data.checkboxItems[i].name) !== -1) {
 changed['checkboxItems['+i+'].checked'] = true
 } else {
 changed['checkboxItems['+i+'].checked'] = false
 }
 }
 this.setData(changed)
 },
 radioChange: function(e) {
 var checked = e.detail.value
 var changed = {}
 for (var i = 0; i < this.data.radioItems.length; i ++) {
 if (checked.indexOf(this.data.radioItems[i].name) !== -1) {
 changed['radioItems['+i+'].checked'] = true
 } else {
 changed['radioItems['+i+'].checked'] = false
 }
 }
 this.setData(changed)
 }
})

.label-1, .label-2{
 margin-bottom: 15px;
}
.label-1__text, .label-2__text {
 display: inline-block;
 vertical-align: middle;
}

.label-1__icon {
 position: relative;
 margin-right: 10px;
 display: inline-block;
 vertical-align: middle;
 width: 18px;
 height: 18px;
 background: #fcfff4;
}

.label-1__icon-checked {
 position: absolute;
 top: 3px;
 left: 3px;
 width: 12px;
 height: 12px;
 background: #1aad19;
}


.label-2__icon {
 position: relative;
 display: inline-block;
 vertical-align: middle;
 margin-right: 10px;
 width: 18px;
 height: 18px;
 background: #fcfff4;
 border-radius: 50px;
}

.label-2__icon-checked {
 position: absolute;
 left: 3px;
 top: 3px;
 width: 12px;
 height: 12px;
 background: #1aad19;
 border-radius: 50%;
}

.label-4_text{
 text-align: center;
 margin-top: 15px;
}

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