This article mainly introduces the relevant information on the example code of the scroll-view component of the WeChat applet to implement the list page. Introduction to the scroll-view component scroll-view is a scrollable view component provided by the WeChat applet. Its main function is to use To do the pull-up loading that is often seen on mobile phones, friends who need it can refer to the introduction of

scroll-view component

scroll-view is provided by WeChat applet The scrollable view component, its main function is to do the pull-up to load and pull-down to refresh the list page that is often seen on mobile phones! Let's take "Shake out a smile" as an example to explain the component. Use !

Import a new page for the app

First we need to import a new page for our mini program and open the app in the project root directory.json This projectConfiguration fileIn the pagesarrayAdd "pages/allJoke/allJoke" and then set the bottom NavigationIn the list item of "tabBar" ("list") Add:

 {
   "text": "列表",
   "pagePath": "pages/allJoke/allJoke",
   "iconPath": "images/note.png",
   "selectedIconPath": "images/noteHL.png"
  },

If you want to know the meaning of the specific configuration, you can refer to the Mini Program Configuration document and I won’t go into details here!

json configuration page

The next step is the configuration page for our new page. Create a new directory such as alljoke under the page directory, then create a new allJoke.json under this directory, and copy the following code to this file. Inside:

{
  "navigationBarTitleText": "笑話集錦",
  "enablePullDownRefresh": true
}

Because we need to use the onPullDownRefresh method provided by the applet when doing pull-down refresh later, enablePullDownRefresh must be turned on in the configuration item. The other option is the top title of the page, which you can set at will or not. !

wxml view page

It’s the turn of the view page. Similarly, create a new alljoke.wxml page in the alljoke directory. wxml is the one created by the mini program The view page document type is written like HTML, so it is not difficult for the front-end to get started. If you need to know more about it, you can read the wxml document. Also copy the following code to alljoke.wxml

<view>
 <view>
  <scroll-view class="scroll" scroll-top="{{scrollTop}}" style="height:580px;" scroll-y="true" bindscroll="scrll"  bindscrolltolower="loadMore">
   <view class="block" wx:for="{{listLi}}" wx:for-item="item">
    <text>{{item.text}}</text>
   </view>  
  </scroll-view>
 </view>
 <view class="top" hidden="{{hidden}}" catchtap="goTop">?</view>
</view>

As you can see, we The protagonist scroll-view also makes a grand appearance here! What I brought here is a long list of configurations, let me tell you about the functions of these configurations!

用到的選項(xiàng)都列出來了,還有一點(diǎn)需要大家特別注意的:

使用豎向滾動(dòng)條時(shí)必須為組件設(shè)置一個(gè)固定高度就是上面代碼style里面設(shè)置的高!切記切記!

更多資料請(qǐng)閱讀微信小程序scroll-view組件文檔

wxss樣式

同樣在alljoke目錄下面新建allJoke.wxss文件,小程序的樣式和傳統(tǒng)css差不多大家可以根據(jù)自己喜好自行設(shè)計(jì),這里我簡(jiǎn)單做了一下樣式比較丑大家將就著用吧.(題外話:受不了的自己動(dòng)手豐衣足食)

.block {
  border: 8px solid #71b471;
  margin: 20rpx 20rpx;
  padding: 10rpx;
  background-color: #fff;
  border-radius: 20rpx;
  text-align: center;
}
.top {
  width: 100rpx;
  height: 100rpx;
  line-height: 100rpx;
  background-color: #fff;
  position: fixed;
  bottom: 40rpx;
  right: 20rpx;
  text-align: center;
  font-size: 50rpx;
  opacity: .8;
  border-radius: 50%;
  border: 1px solid #fff; 
}

小程序文檔中關(guān)于樣式的介紹

邏輯部分

來到最后也是最重要的邏輯部分了!老規(guī)矩alljoke目錄下新建allJoke.js文件,先貼代碼再慢慢講解:

Page({
 data:{
  listLi:[],
  page:1,
  scrollTop:0,
  done: false,
  hidden: true
 },
 onLoad:function(options){
  this.getList(1);
 },

 onPullDownRefresh: function(){
  wx.showToast({
   title: '加載中',
   icon: 'loading'
  });
  this.getList(1,true);
 },

 getList: function(page, stopPull){
  var that = this
  wx.request({
   url: 'https://wechat.sparklog.com/jokes',
   data: {
    page: page,
    per: '20'
   },
   method: 'GET', 
   success: function(res){
    if(page===1){
     that.setData({
      page: page+1,
      listLi: res.data,
      done: false
     })
     if(stopPull){
      wx.stopPullDownRefresh()      
     }
    }else{
     if(res.data<20){
      that.setData({
       page: page+1,
       listLi: that.data.listLi.concat(res.data),
       done: true
      }) 
     }else{
      that.setData({
       page: page+1,
       listLi: that.data.listLi.concat(res.data)
      }) 
     }  
    }
   },
  })
 },

 loadMore: function(){
  var done = this.data.done;
  if(done){
   return
  }else{
   wx.showToast({
    title: &#39;加載中&#39;,
    icon: &#39;loading&#39;,
    duration: 500
   });
   var page = this.data.page;
   this.getList(page)
  }
 },

 scrll: function(e){
  var scrollTop = e.detail.scrollTop
  if(scrollTop>600){
   this.setData({
    scrollTop: 1,
    hidden: false    
   })
  }else{
   this.setData({
    scrollTop: 1,
    hidden: true  
   });
  }
 },

 goTop: function(){
  this.setData({
   scrollTop:0,
   hidden: true 
  })
 }
})

大家可以看到首先我們需要用page()函數(shù)注冊(cè)頁面,然后在data里面定義一些初始化數(shù)據(jù).onLoad是這個(gè)頁面的生命周期函數(shù),頁面加載時(shí)會(huì)調(diào)用到它.我們?cè)陧撁婕虞d時(shí)調(diào)用了自定義的getList函數(shù).這個(gè)函數(shù)接收兩個(gè)參數(shù),第一個(gè)參數(shù)是要加載的頁面,第二個(gè)參數(shù)是布爾值,用來判斷是下拉刷新調(diào)用的這個(gè)函數(shù),還是頁面加載時(shí)調(diào)用的這個(gè)函數(shù)!接下來onPullDownRefresh是小程序提供的下拉刷新函數(shù),里面wx.showToast顯示消息提示框,用來提示用戶正在加載,loadMore是滾動(dòng)到底部觸發(fā)的事件.函數(shù)里面會(huì)檢查是否已經(jīng)加載了全部列表項(xiàng),如果已經(jīng)加載了全部列表項(xiàng)會(huì)return掉,如果數(shù)據(jù)庫還有列表項(xiàng),上拉到底部加載下一頁!scrll函數(shù)是滾動(dòng)時(shí)觸發(fā)的函數(shù),可以看到這個(gè)函數(shù)會(huì)判斷滾動(dòng)條位置是否大于六百,如果大于六百顯示點(diǎn)擊直達(dá)底部的按鈕,如果小于六百隱藏直達(dá)頂部的按鈕.同時(shí)會(huì)更新滾動(dòng)條位置的參數(shù).剛剛在講wxml時(shí)已經(jīng)講過scroll-view組件設(shè)置豎向滾動(dòng)條位置scroll-top設(shè)置項(xiàng)時(shí)如果參數(shù)一樣,頁面不會(huì)重新渲染,我們就是利用了這一點(diǎn),如果要到達(dá)頂部,位置必定是'0',滾動(dòng)時(shí)觸發(fā)scrll函數(shù),我們把位置信息設(shè)置為'1',因?yàn)闈L動(dòng)函數(shù)會(huì)反復(fù)觸發(fā),所以此時(shí)頁面是不會(huì)渲染的.也就是說由于位置設(shè)置參數(shù)都是設(shè)置為'1'不變,導(dǎo)致scroll-top設(shè)置項(xiàng)不會(huì)生效為goTop函數(shù)的直達(dá)頂部(把參數(shù)變?yōu)?0'提供機(jī)會(huì)).最后就是直達(dá)頂部按鈕的函數(shù)了,可以看到它是把位置信息變?yōu)?0',參數(shù)變化scroll-top設(shè)置生效,頁面直達(dá)頂部.最后再通過改變hidden這個(gè)參數(shù)把自己(直達(dá)頂部按鈕)給隱藏掉了!

結(jié)尾

ok,通過上面的步驟我們終于實(shí)現(xiàn)了下拉刷新上拉加載的列表頁功能了,從上面我們可以看到微信提供的接口和api還是挺全面的,要實(shí)現(xiàn)一個(gè)功能總體來說要比原生js實(shí)現(xiàn)要簡(jiǎn)單一些!

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The above is the detailed content of Detailed explanation of how scroll-view completes list pages. For more information, please follow other related articles on the PHP Chinese website!

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