Implementation of sidebar classification effects in WeChat mini-program mall

This article mainly introduces the sidebar classification effect of the actual WeChat mini program shopping mall series in detail. It has a certain reference value. Interested friends can refer to it

In the shopping mall project, There are usually category pages.
The category page allows users to quickly find related products. Let’s take the sidebar classification as an example, as shown below

##Layout analysis:

The left box uses standard flow
The right box uses absolute positioning (top, right)

# wxml：

<!--主盒子--> 
<view class="container"> 
 <!--左侧栏--> 
 <view class="nav_left"> 
 <block wx:for="{{navLeftItems}}"> 
 <!--当前项的id等于item项的id，那个就是当前状态--> 
 <!--用data-index记录这个数据在数组的下标位置，使用data-id设置每个item的id值，供打开2级页面使用--> 
 <view class="nav_left_items {{curNav == item.id ? &#39;active&#39; : &#39;&#39;}}" bindtap="switchRightTab" data-index="{{index}}" data-id="{{item.id}}">{{item.tree.desc}}</view> 
 </block> 
 </view> 
 <!--右侧栏--> 
 <view class="nav_right"> 
 <!--如果有数据，才遍历项--> 
 <view wx:if="{{navRightItems[curIndex].tree.nodes[1].tree.nodes}}"> 
 <block wx:for="{{navRightItems[curIndex].tree.nodes[1].tree.nodes}}"> 
 <view class="nav_right_items"> 
  <navigator url="../list/index?brand={{item.tree.id}}&typeid={{navRightItems[curIndex].id}}"> 
  <!--用view包裹图片组合，如果有图片就用，无图片提供就使用50x30的这个默认图片--> 
  <view>  
  <block wx:if="{{item.tree.logo}}"> 
  <image src="{{item.tree.logo}}"></image> 
  </block> 
  <block wx:else> 
  <image src="http://temp.im/50x30"></image> 
  </block> 
  </view> 
  <!--如果有文字，就用文字；无文字就用其他--> 
  <view wx:if="{{item.tree.desc}}"> 
  <text>{{item.tree.desc}}</text> 
  </view> 
  <view wx:else> 
  <text>{{item.tree.desc2}}</text> 
  </view> 
  </navigator> 
 </view> 
 </block> 
 </view> 
 <!--如果无数据，则显示数据--> 
 <view wx:else>暂无数据</view> 
 </view> 
</view>

wxss：

page{ 
 background: #f5f5f5; 
} 
/*总体主盒子*/ 
.container { 
 position: relative; 
 width: 100%; 
 height: 100%; 
 background-color: #fff; 
 color: #939393; 
} 
 
/*左侧栏主盒子*/ 
.nav_left{ 
 /*设置行内块级元素（没使用定位）*/ 
 display: inline-block; 
 width: 25%; 
 height: 100%; 
 /*主盒子设置背景色为灰色*/ 
 background: #f5f5f5; 
 text-align: center; 
} 
/*左侧栏list的item*/ 
.nav_left .nav_left_items{ 
 /*每个高30px*/ 
 height: 30px; 
 /*垂直居中*/ 
 line-height: 30px; 
 /*再设上下padding增加高度，总高42px*/ 
 padding: 6px 0; 
 /*只设下边线*/ 
 border-bottom: 1px solid #dedede; 
 /*文字14px*/ 
 font-size: 14px; 
} 
/*左侧栏list的item被选中时*/ 
.nav_left .nav_left_items.active{ 
 /*背景色变成白色*/ 
 background: #fff; 
} 
 
/*右侧栏主盒子*/ 
.nav_right{ 
 /*右侧盒子使用了绝对定位*/ 
 position: absolute; 
 top: 0; 
 right: 0; 
 flex: 1; 
 /*宽度75%，高度占满，并使用百分比布局*/ 
 width: 75%; 
 height: 100%; 
 padding: 10px; 
 box-sizing: border-box; 
 background: #fff; 
} 
/*右侧栏list的item*/ 
.nav_right .nav_right_items{ 
 /*浮动向左*/ 
 float: left; 
 /*每个item设置宽度是33.33%*/ 
 width: 33.33%; 
 height: 80px; 
 text-align: center; 
} 
.nav_right .nav_right_items image{ 
 /*被图片设置宽高*/ 
 width: 50px; 
 height: 30px; 
} 
.nav_right .nav_right_items text{ 
 /*给text设成块级元素*/ 
 display: block; 
 margin-top: 5px; 
 font-size: 10px; 
 /*设置文字溢出部分为...*/ 
 overflow: hidden; 
 white-space: nowrap; 
 text-overflow: ellipsis; 
}

js：

Page({ 
 data: { 
 navLeftItems: [], 
 navRightItems: [], 
 curNav: 1, 
 curIndex: 0 
 }, 
 onLoad: function() { 
 // 加载的使用进行网络访问，把需要的数据设置到data数据对象 
 var that = this  
 wx.request({ 
  url: 'http://huanqiuxiaozhen.com/wemall/goodstype/typebrandList', 
  method: 'GET', 
  data: {}, 
  header: { 
  'Accept': 'application/json' 
  }, 
  success: function(res) { 
  console.log(res) 
  that.setData({ 
   navLeftItems: res.data, 
   navRightItems: res.data 
  }) 
  } 
 }) 
 }, 
 
 //事件处理函数 
 switchRightTab: function(e) { 
 // 获取item项的id，和数组的下标值 
 let id = e.target.dataset.id, 
  index = parseInt(e.target.dataset.index); 
 // 把点击到的某一项，设为当前index 
 this.setData({ 
  curNav: id, 
  curIndex: index 
 }) 
 } 
 
})

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