微信小程序多行文本顯示...+顯示更多按鈕和收起更多按鈕功能

更新時(shí)間：2019年09月26日 14:57:02 作者：孤獨(dú)行善

這篇文章主要介紹了微信小程序多行文本顯示...+顯示更多按鈕和收起更多按鈕,代碼簡(jiǎn)單易懂，非常不錯(cuò)，具有一定的參考借鑒價(jià)值，需要的朋友可以參考下

看了很多帖子，但是效果都不是很好。還是找微信小程序官方文檔，自己寫(xiě)比較方便。自己動(dòng)手豐衣足食！話不多說(shuō)，上代碼！

時(shí)空傳送

先來(lái)個(gè)效果圖

1212

html

<block wx:for='{{trendsList}}' wx:key='index'>
  <view class="box">
   <view class="textFour_box {{item.seeMore?'three':''}}">{{item.text}}</view>
   <view class="text_toggle_box" wx:if='{{item.seeMore}}' data-index='{{index}}' catchtap='toggleHandler'>
    <text class="text_toggle_text">查看更多</text>
    <image class="toggle-icon" src="../../images/1.png"></image>
   </view>
   <view class="text_toggle_box" wx:if='{{!item.seeMore && item.auto}}' data-index='{{index}}' catchtap='toggleContent'>
    <text class="text_toggle_text">收起</text>
    <image class="toggle-icon" src="../../images/2.png"></image>
   </view>
  </view>
 </block>

wxss

.box{
 margin: 40rpx 32rpx;
}
.text_box{
 width: 100%;
 font-size: 30rpx;
 font-weight: 400;
 color: rgba(87,105,123,1);
 line-height: 48rpx;
}
.textFour_box{
 width: 100%;
 font-size: 30rpx;
 font-weight: 400;
 color: rgba(87,105,123,1);
 line-height: 26px;
 text-align: justify;
}
.toggle-icon {
 width: 25rpx;
 height: 25rpx;
}
.text_toggloe_box{
 display: -webkit-box;
 display: -webkit-flex;
 flex-direction: row;
 align-items: center;
 margin: 10rpx 0;
}
.text_toggle_text{
 font-size: 24rpx;
 color: #333;
 line-height: 32rpx;
 margin-right: 10rpx;
}
.three{
 text-overflow: -o-ellipsis-lastline;
 overflow: hidden;
 text-overflow: ellipsis;
 display: -webkit-box;
 -webkit-line-clamp: 3;
 line-clamp: 3;
 -webkit-box-orient: vertical;
}

js

var index;
Page({
 /**
  * 頁(yè)面的初始數(shù)據(jù)
  */
 data: {
  trendsList:[
   {
    auto: false,
    seeMore: false,
    text: '小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟',
   },
   {
    auto: false,
    seeMore: false,
    text: '小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟',
   },
    {
    auto: false,
    seeMore: false,
     text: '小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟',
   },
   {
    auto: false,
    seeMore: false,
    text: '小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟',
   },
   {
    auto: false,
    seeMore: false,
    text: '小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟小老弟',
   },
  ]
 },
 /**
  * 生命周期函數(shù)--監(jiān)聽(tīng)頁(yè)面加載
  */
 onLoad: function (options) {
  var that = this;
  const query = wx.createSelectorQuery();
  query.selectAll('.textFour_box').fields({
   size: true,
  }).exec(function (res) {
   console.log(res[0], '所有節(jié)點(diǎn)信息');
   let lineHeight = 26; //固定高度值 單位：PX
   for (var i = 0; i < res[0].length; i++) {
    if ((res[0][i].height / lineHeight) > 3) {
     that.data.trendsList[i].auto = true;
     that.data.trendsList[i].seeMore = true;
    }
   }
   that.setData({
    trendsList: that.data.trendsList
   })
  })
 },
 /**
  * 生命周期函數(shù)--監(jiān)聽(tīng)頁(yè)面初次渲染完成
  */
 onReady: function () {
 },
 /**
  * 生命周期函數(shù)--監(jiān)聽(tīng)頁(yè)面顯示
  */
 onShow: function () {
 },
 /**
  * 生命周期函數(shù)--監(jiān)聽(tīng)頁(yè)面隱藏
  */
 onHide: function () {
 },
 /**
  * 生命周期函數(shù)--監(jiān)聽(tīng)頁(yè)面卸載
  */
 onUnload: function () {
 },
 /**
  * 頁(yè)面相關(guān)事件處理函數(shù)--監(jiān)聽(tīng)用戶下拉動(dòng)作
  */
 onPullDownRefresh: function () {
 },
 /**
  * 頁(yè)面上拉觸底事件的處理函數(shù)
  */
 onReachBottom: function () {
 },
 /**
  * 用戶點(diǎn)擊右上角分享
  */
 onShareAppMessage: function () {
 },
 //展開(kāi)更多
 toggleHandler: function (e) {
  var that = this;
  index = e.currentTarget.dataset.index;
  for (var i = 0; i < that.data.trendsList.length; i++) {
   if (index == i) {
    that.data.trendsList[index].auto = true;
    that.data.trendsList[index].seeMore = false;
   }
  }
  that.setData({
   trendsList: that.data.trendsList
  })
 },
 //收起更多
 toggleContent: function (e) {
  var that = this;
  index = e.currentTarget.dataset.index;
  for (var i = 0; i < that.data.trendsList.length; i++) {
   if (index == i) {
    that.data.trendsList[index].auto = true;
    that.data.trendsList[index].seeMore = true;
   }
  }
  that.setData({
   trendsList: that.data.trendsList
  })
 },
})

總結(jié)

以上所述是小編給大家介紹的微信小程序多行文本顯示...+顯示更多按鈕和收起更多按鈕功能,希望對(duì)大家有所幫助，如果大家有任何疑問(wèn)請(qǐng)給我留言，小編會(huì)及時(shí)回復(fù)大家的。在此也非常感謝大家對(duì)腳本之家網(wǎng)站的支持！
如果你覺(jué)得本文對(duì)你有幫助，歡迎轉(zhuǎn)載，煩請(qǐng)注明出處，謝謝！

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