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小程序实现多选框功能

时间：2020-10-16 12:45:36|栏目：JavaScript代码|点击： 次

最近写小程序的时候，遇到多选框的问题！并不是多选框不好操作，而是小程序的多选框实在太丑了好吗！本来的初衷是想修改一下默认样式就OK了，从边框 宽度 到背景 却在最后选择出来的额icon上无从下手！没办法自己手写checked的效果采用的是icon图标。感兴趣的可以往下看看！

先来看看效果图

实现的原理也非常的简单，数据渲染到列表，绑定事件修改列表项的checked属性，不建议直接操作data的数据，当要操作的时候可以定义一个局部变量，局部操作完成后，在赋值给data，利用数据双向绑定的特性，就完成所有的操作

wxml

<view class='header1'>
 <view class='header'>
  <view class='header_con flex_between'>
   <view class='left'>
    共计{{items.length}}件商品
   </view>
   <view class='right flex_end'>
    <view wx:if="{{!management_good}}" class='flex_center' bindtap='management'>
     管理
    </view>
    <view wx:if="{{management_good}}" class='flex_center' bindtap='finish_management'>
     完成
    </view>
   </view>
  </view>
 </view>
</view>
<view class='header2'>
 <view class='header'>
  <view class='header_con flex_between'>
   <input value='类目一' disabled='{{title_disabled}}' focus="{{!title_disabled}}">
   </input>
   <view class='right flex_end'>
    <block wx-if="{{title_disabled}}">
     <image src='../../../image/hotel/delete.png' bindtap='change_classname'></image>
    </block>
    <block wx-if="{{!title_disabled}}">
     <view class='flex_center' bindtap='finish_classname'>
      完成
     </view>
    </block>
   </view>
  </view>
 </view>
</view>
<view class='onlinechoose'>
 <view class='hotel_list flex_center' wx:for="{{items}}" wx:key="items" wx:for-item="i" data-id="{{index}}" bindtap='select'>
  <view class='list_cons flex_start'>
   <view wx:if="{{management_good}}" class='lefts'>
    <block wx-if="{{!i.checked}}">
     <view class='icon_none'></view>
    </block>
    <block wx-if="{{i.checked}}">
     <icon type="success" size="30" color="red" />
    </block>
   </view>
   <image src='../../../image/hotel/demoimg.jpg'></image>
   <view class='right'>
    <view class='name'>
     {{i.name}}
    </view>
    <view class='list1 flex_between'>
     <view class='left'>
      <view class='condition1'>
       16?O|双人床|含早
      </view>
      <view class='condition2'>
       <block>
        间数：10
       </block>
       <block>
        间数：2
       </block>
      </view>
     </view>
    </view>
    <view class='list1 flex_between'>
     <view class='left'>
      <view class='condition2'>
       类目一
      </view>
     </view>
    </view>
   </view>
  </view>
 </view>
</view>
<view class='bottom flex_between' wx:if="{{management_good}}">
 <view class='left flex_start'>
  <block wx:if="{{select_all}}">
   <view bindtap='select_none' class='flex_start'>
    <icon type="success" size="30" color="red" />
    <view>
     取消全选
    </view>
   </view>
  </block>
  <block wx:if="{{!select_all}}">
   <view bindtap='select_all' class='flex_start'>
    <view class='select_none'>
    </view>
    <view>
     全选
    </view>
   </view>
  </block>
 </view>
 <view class='right flex_end'>
  <view style='text-align:right'>
   <view class='all'>
    共选中{{middlearr.length}}件商品
   </view>
  </view>
  <view bindtap='deleteitem' class='sure'>
   删除
  </view>
 </view>
</view>

下面是我的代码 由于wxss我是在app.wxss和当前文件都有的没太多的整理全都贴上去了，在这里多说一句小程序是支持弹性布局的，当你命名好几个弹性盒子的类名后，将会发现css将会减少很大的工作量

wxss

.header1{
 background-color: #f5f5f5;
}
.header2{
 background-color: #ffffff;
}
.header {
 width: 100%;
 height: 80rpx;
 border-bottom: 1rpx solid #d6d6d6;
}
.header .header_con {
 width: 700rpx;
 height: 80rpx;
 margin: 0 auto;
 color: #333;
 font-size: 30rpx;
}
.header .header_con image{
 width: 44rpx;
 height: 44rpx;
}
.header .header_con .right{
 color: #ff4965;
}
.bottom{
 width: 100%;
 height: 100rpx;
 border-top: 1rpx solid #d6d6d6;
 background-color: #fff;
 position: fixed;
 left: 0rpx;
 bottom: 0rpx;
}
.bottom .left{
 margin-left: 25rpx;
}
.bottom .left .select_none{
 width: 60rpx;
 height: 60rpx;
 border: 1rpx solid #d6d6d6;
 border-radius: 50%;
}
.bottom .right .all{
 color: #ff830f;
 font-size: 26rpx;
}
.bottom .right .gray{
 color: #666666;
 font-size: 22rpx;
}
.bottom .right .sure{
 margin-left: 22rpx;
 width: 220rpx;
 height: 100rpx;
 line-height: 100rpx;
 text-align: center;
 background-color: #ff4965;
 color: #fff;
}

/*列表*/
.onlinechoose{
 width: 750rpx;
 margin-top: 15rpx;
 background-color: #ffffff;
 font-size: 32rpx;
}
.onlinechoose .hotel_list{
 width: 750rpx;
 height: 260rpx;
 border-bottom: 1rpx solid #d6d6d6;
 background-color: #ffffff;
}
.onlinechoose .hotel_list .icon_none{
 width: 60rpx;
 height: 60rpx;
 border: 1rpx solid #d6d6d6;
 border-radius: 50%;
}
.onlinechoose .hotel_list .list_cons{
 width: 700rpx;
 height: 200rpx;
}
.onlinechoose .list_cons .lefts{
 width: 80rpx;
}
.onlinechoose .list_cons image{
 width: 200rpx;
 height: 200rpx;
 margin-right: 25rpx;
}
.list_cons .right{
 width: 395rpx;
 height: 200rpx;
}
.list_cons .right .name{
 font-size: 32rpx;
 color: #333333;
 font-weight: 700;
 letter-spacing: 3rpx;
 margin-bottom: 20rpx;
}
.list_cons .right .list1{
  margin-bottom: 17rpx;
}
.list_cons .right .list1 .condition1{
 font-size: 28rpx;
 color: #999999;
 margin-bottom: 15rpx;
}
.list_cons .right .list1 .condition2{
 font-size: 24rpx;
 color: #999999;
}
.list_cons .right .list1 .act{
 color: #2d8622;
}
.list_cons .right .list1 .r{
 font-size: 24rpx;
 color: #ff4965;
}
.list_cons .right .list1 .big{
 font-size: 32rpx;
}
.list_cons .right .lists2{
 height: 36rpx;
  line-height: 36rpx;
  font-size: 22rpx;
}
.list_cons .right .lists2 .left{
 width: 162rpx;
 text-align: center; 
 color: #ff4965;
 border: 1rpx solid #ff4965;
 box-sizing: border-box;
 border-radius: 5rpx;
}
.list_cons .right .lists2 .right2{
 color: #999999;
}
.flex_center{
 display: flex;
 display: -webkit-flex;
 justify-content: center;
 align-items: center;
}
.flex_between{
 display: flex;
 display: -webkit-flex;
 justify-content: space-between;
 align-items: center;
}
.flex_start{
 display: flex;
 display: -webkit-flex;
 justify-content: flex-start;
 align-items: center;
}
.flex_end{
 display: flex;
 display: -webkit-flex;
 justify-content: flex-end;
 align-items: center;
}

js

js纯手写虽然不太好吧！但是功能实现了，万恶 的checkbox魔鬼
初始化

data: {
  imgUrl: imgUrl,
  title_disabled:true,//控制修改表头名字
  management_good:false,
  select_all:false,
  middlearr:[],
  items: [
   { name: '1', checked: false},
   { name: '2', checked: false},
   { name: '3', checked: false},
   { name: '4', checked: false},
   { name: '5', checked: false},
   { name: '6', checked: false},
  ],
 },
 // 改变类目的名字
 change_classname:function(){
   let that = this;
   that.setData({
    title_disabled: !that.data.title_disabled,
   });
  // 这里自动获取焦点
 },
 finish_classname: function () {
  let that = this;
  that.setData({
   title_disabled: !that.data.title_disabled,
  })
 },
 // 管理商品
 management:function(){
  let that = this;
  that.setData({
   management_good: true,
  })
 },
 finish_management:function(){
  let that = this;
  that.setData({
   management_good:false,
  })
 },
 // 选择
 select:function(e){
  var that = this;
  let arr2 = [];
  if (that.data.management_good == false){
    return;
  }else{
   var arr = that.data.items;
   var index = e.currentTarget.dataset.id;
   arr[index].checked = !arr[index].checked;
   console.log(arr);

   for(let i=0;i<arr.length;i++){
     if(arr[i].checked){
      arr2.push(arr[i])
     }
   };
   that.setData({
    items: arr,
    middlearr:arr2
   })
  }
 },
 // 删除
 deleteitem:function(){
  var that = this;
  let arr = that.data.items;
  let arr2 = [];
  console.log(arr);
  for(let i=0;i<arr.length;i++){
   if (arr[i].checked == false){
    arr2.push(arr[i]);
   }
  }
  that.setData({
   items:arr2,
   middlearr:[]
  })
 },
 // 全选
 select_all:function(){
  let that = this;
  that.setData({
   select_all: !that.data.select_all
  })
  if (that.data.select_all){
   let arr = that.data.items;
   let arr2 = [];
   for (let i = 0; i < arr.length; i++) {
    if (arr[i].checked == true) {
     arr2.push(arr[i]);
    }else{
     arr[i].checked = true;
     arr2.push(arr[i]);
    }
   }
   that.setData({
    items: arr2,
    middlearr:arr2
   })
  }
 },
 // 取消全选
 select_none:function(){
  let that = this;
  that.setData({
   select_all: !that.data.select_all
  })
  let arr = that.data.items;
  let arr2 = [];
  for (let i = 0; i < arr.length; i++) {
    arr[i].checked = false;
    arr2.push(arr[i]);
  }
  that.setData({
   items: arr2,
   middlearr:[]
  })
 },

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本文标题：小程序实现多选框功能

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