An in-depth explanation of how to implement search functions in mini programs

How to implement the common search functions of mini programs? The following article will take you step by step to understand the method of implementing the search function in the mini program. I hope it will be helpful to you!

In the process of developing each small program, it will basically be equipped with a search function. So how is the relatively intelligent search function implemented? After a period of study, I have learned a relatively comprehensive search box function, let’s take a look!

Development Preparation

• WeChat Mini Program
• Youzanvant Component Library

Effect display

Let’s take a look at the effect first

Preliminary preparation

The cloud database imports some data to test the search Frame function

realization

Create three new pages under the directory

index for The first page of the search box

search is the page used for specific searches

hotsearch is the detailed page of the search content

First of all, let’s take a look at the layout of the index on the first page of the search box. Here we mainly introduce the content of the search box. The other content below will not be described in detail here

This is the index.wxml code

      <view class="search_1" bindtap="gotoSearch">
          <van-search 
          placeholder="搜索单品" disabled
          />
        </view>
      <view class="search_2">
        <view class="pic" bindtap="list" >
          <image src=""></image>
        </view>
      </view>
    </view>

This is the search.wxml code of the search box

  <view class="dewu-search">
    <view class="return" >
      <view class="return_pic" bindtap="gotoindex">
        <image src=""></image>
      </view>
      <view class="txt">搜索</view>
    </view>
  </view>
  <van-search 
      value="{{value}}" 
      show-action 
      placeholder="输入商品名称、货号"
      bind:clear="onClear" 
      bind:search="onSearch"   
      bind:cancel="oncancel" 
      bind:change="onchange"
      bindtap="input"
      value="{{value}}"
    />
    <block wx:if="results.length > 0">
      <van-cell wx:for="{{results}}" wx:key="_id" title="{{item.title}}"  size="large"  />
    </block>
    <view class="page1" hidden="{{issuggest==true?&#39;hidden&#39;:&#39;&#39;}}" >
        <view class="bd">
          <view class="content">热门搜索</view>
          <view class="box">
            <view class="items">
              <view class="item" wx:for="{{goods}}"
              wx:key="index"  bindtap="hotsearch" data-id="{{item.id}}"
              >
              {{item.hot}}
              </view>
            </view>
          </view>
        </view>
        <view class="last">
          <view class="content">搜索历史</view>
          <view class="box">
            <view class="items">
              <view class="item" wx:for="{{historyList}}" wx:key="index" data-id="{{item.id}}" bindtap="gotohistoryList"
              wx:key="index">
                {{item.hot}}
              </view>
            </view>
          </view>
        </view>
    </view>
    <view class="page2"   hidden="{{issuggest==false?&#39;hidden&#39;:&#39;&#39;}}">
      <view class="content1">
        <view class="title" wx:for="{{goods1}}" data-id="{{item.id}}"
              wx:key="index"  bindtap="hotsearch" >
              {{item.hot}}
        </view>
      </view>
    </view>
</view>

js must first be introduced into the cloud database Data

    const db = wx.cloud.database();
    const dewuCollection = db.collection('dewu');

To pop up related content when the input box changes, two pages are needed. When there is content input in the input box, the hidden page is displayedhidden="{{ issuggest==false?'hidden':''}}" to determine whether related content pages should appear. Use indexOf to determine whether e.detail (content of the input box) exists in the cloud database. If it exists, then store this data in an array and connect For the previously searched array, use wx.setStorageSync(); to store the data in the input box into storage, and then wx.getStorageSync() to extract the data.

This is the details page that will pop up when there is data in the input box. Click to jump to the product details page

This is the search box Logic

    if(e.detail.length!=0){
        this.setData({
          issuggest:true,
        })
        var arr = [];
        console.log(this.data.goods.length);
            for (var i = 0; i < this.data.goods.length; i++) {
              if (this.data.goods[i].hot.indexOf(e.detail)>=0) {
                arr.push(this.data.goods[i]);
              }
              this.setData({
              goods1:arr,
           })
          }
    }
    else {
      console.log(&#39;succes&#39;);
      this.setData({
         issuggest:false
      })
    }
  },
    async onSearch(e){
    var arr1=new Array();
    var historyList=new Array();
    var storage=new Array();
    for (let i = 0; i < this.data.goods.length; i++){
      if(e.detail==this.data.goods[i].hot){
        arr1.push(this.data.goods[i]);
        console.log(arr1);
        break
      }
      else{
              arr1.push(e.detail);
              console.log(arr1);
        }
    }
    if(arr1.length>1){
      this.setData({
        storage:arr1.slice(arr1.length-1,arr1.length)
      })
    }
    else{
      console.log(arr1,&#39;要存进去的数据&#39;);
      this.setData({
        storage:arr1
      })
    }
    if(this.data.historyList !=[]){
      this.data.historyList = this.data.historyList.concat(this.data.storage);//连接
    }
    else{
      this.data.historyList=this.data.storage
    }
   wx.setStorageSync(&#39;historyList&#39;, this.data.historyList);
   this.setData({
    historyList:this.data.historyList
  })
  },

wx.navigateTo can be used to jump to a detailed page, add a string template, determine the value of the id, and use data to Drive the page and jump to the same page with different data.

wx.navigateTo({
      url: `../hotsearch/hotsearch?id=`+id
    })

Finally, the data needs to be updated

     wx.showLoading({
       title: '数据加载中...',
     })   
     setTimeout(()=>{
      wx.hideLoading()
       this.setData({
          goodsNav: nav,
          goodsList:List,
          recommend:List,
          goods2:this.data.historyList
       })
      },1000)
// console.log(goodsList,'===========');
   },

Be careful not to forget to introduce the address of the component you need to use in the global json or local page json

    "usingComponents": {
        "van-search":"./miniprogram_npm/@vant/weapp/search/index"
  },

Extension

This function of automatically jumping to the middle of the navigation bar is also very commonly used

This is the most important part of the wxml codescroll- x="true" Let the navigation bar slide in the horizontal direction scroll-with-animation="true" Let the sliding animate, scroll-into-view="{{scrollTop }}"

      <scroll-view  scroll-x="true"
                 scroll-with-animation="true"
                 style="width:100%;" class="scroll-view_H " 
                 scroll-into-view="{{scrollTop}}">
        <view 
        wx:for="{{goodsNav}}"
        wx:key="index"
        id="{{item.id}}"
        data-index="{{index}}"
        data-type="{{item.type}}"
        bindtap="changegoods"
        class="scroll-view-item_H {{activeNavIndex == index?&#39;active&#39;: &#39;&#39;}}  "
        >
          <text>{{item.text}}</text>
        </view>
      </scroll-view>
    </view>

This is the event bound to the navigation barlet {index, type} = e.currentTarget.dataset;Extract index and type, and then set A count is used as the first few, and then spliced ​​to id, and the value of id is passed to scrollTop, so that the navigation bar jumps to scrollTopThis value, this value is in the middle

     console.log(e);
    let {index, type} = e.currentTarget.dataset;
    console.log("index=" +index, "type="+type);
    this.setData({
      activeNavIndex:index
    })
    if (type == 'recommend') {
      this.setData({
        goodsList: this.data.recommend
      })
    } 
    else {
        let goods = this.data.recommend.filter((good) => good.camptype == type )
        this.setData({
          goodsList: goods
        })
        //console.log(this.data.goods)
      }
    
      var index1 = e.currentTarget.dataset.index;
      var count = 2;
      var id = "item"+(index1-count);//拼接id
      if(count == 2 && index1 < 3 || count == 3 && index1 < 2 || count == 4 && index1 < 3){
        id = "item0";
      }
      console.log("下标",index1,"---分类id名称",id)
      this.setData({
        scrollTop: id
      })
    },

The effect can be achieved by adding wxss However, there is a problem with writing like this, that is, when the displayed content is an even number, such as 6, it cannot jump to the middle correctly, and will jump to the position of 3, which will cause a slight deviation. I have not solved this problem yet. , I wonder if anyone knows how to solve this?

Source code

Here is the complete source code of the project. Part of the code is given above. If you are interested, you can check out the complete source code

https: //gitee.com/xinccc/fullstack_huoshan/tree/master/wxapp/dewu

Summary

This is the first time I have written a slightly complete project. Here I mainly introduce the main difficulties I encountered during the development process. Although there are no difficulties in general, It means a lot to me. Having such an experience made me realize that I still have a lot to learn. I am also grateful to the teachers and classmates who helped me with guidance when I had difficulties. If you feel that this article If the article reaches your point, you might as well give me a like, which will be a great encouragement to me. If you guys have any advice, I hope we can discuss and learn together in the comment area.

For more programming-related knowledge, please visit: Introduction to Programming! !

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