微信小程序多行文本显示...+显示更多按钮和收起更多按钮功能

看了很多帖子，但是效果都不是很好。还是找微信小程序官方文档，自己写比较方便。自己动手丰衣足食！话不多说，上代码！

成都创新互联公司是一家专注网站建设、网络营销策划、小程序定制开发、电子商务建设、网络推广、移动互联开发、研究、服务为一体的技术型公司。公司成立十载以来，已经为成百上千家广告设计各业的企业公司提供互联网服务。现在，服务的成百上千家客户与我们一路同行，见证我们的成长；未来，我们一起分享成功的喜悦。

时空传送

先来个效果图

html


  
   {{item.text}}
   
    查看更多
    
   
   
    收起

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;
}

var index;
Page({
 /**
  * 页面的初始数据
  */
 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',
   },
  ]
 },
 /**
  * 生命周期函数--监听页面加载
  */
 onLoad: function (options) {
  var that = this;
  const query = wx.createSelectorQuery();
  query.selectAll('.textFour_box').fields({
   size: true,
  }).exec(function (res) {
   console.log(res[0], '所有节点信息');
   let lineHeight = 26; //固定高度值 单位：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
   })
  })
 },
 /**
  * 生命周期函数--监听页面初次渲染完成
  */
 onReady: function () {
 },
 /**
  * 生命周期函数--监听页面显示
  */
 onShow: function () {
 },
 /**
  * 生命周期函数--监听页面隐藏
  */
 onHide: function () {
 },
 /**
  * 生命周期函数--监听页面卸载
  */
 onUnload: function () {
 },
 /**
  * 页面相关事件处理函数--监听用户下拉动作
  */
 onPullDownRefresh: function () {
 },
 /**
  * 页面上拉触底事件的处理函数
  */
 onReachBottom: function () {
 },
 /**
  * 用户点击右上角分享
  */
 onShareAppMessage: function () {
 },
 //展开更多
 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
  })
 },
})

总结

以上所述是小编给大家介绍的微信小程序多行文本显示...+显示更多按钮和收起更多按钮功能,希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对创新互联网站的支持！
如果你觉得本文对你有帮助，欢迎转载，烦请注明出处，谢谢！

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