详解微信小程序实现仿微信聊天界面(各种细节处理)

var that = this;
var query = wx.createSelectorQuery();
query.select('.scrollMsg').boundingClientRect(function(rect) {
	that.setData({
		scrollTop: rect.height+'px';
	});
}).exec();

this.setData({
	toView: 'msg-' + (msgList.length - 1)
})

// pages/contact/contact.js
const app = getApp();
var inputVal = '';
var msgList = [];
var windowWidth = wx.getSystemInfoSync().windowWidth;
var windowHeight = wx.getSystemInfoSync().windowHeight;
var keyHeight = 0;

/**
 * 初始化数据
 */
function initData(that) {
 inputVal = '';

 msgList = [{
   speaker: 'server',
   contentType: 'text',
   content: '欢迎来到英雄联盟，敌军还有30秒到达战场，请做好准备！'
  },
  {
   speaker: 'customer',
   contentType: 'text',
   content: '我怕是走错片场了...'
  }
 ]
 that.setData({
  msgList,
  inputVal
 })
}

/**
 * 计算msg总高度
 */
// function calScrollHeight(that, keyHeight) {
//  var query = wx.createSelectorQuery();
//  query.select('.scrollMsg').boundingClientRect(function(rect) {
//  }).exec();
// }

Page({

 /**
  * 页面的初始数据
  */
 data: {
  scrollHeight: '100vh',
  inputBottom: 0
 },

 /**
  * 生命周期函数--监听页面加载
  */
 onLoad: function(options) {
  initData(this);
  this.setData({
   cusHeadIcon: app.globalData.userInfo.avatarUrl,
  });
 },

 /**
  * 生命周期函数--监听页面显示
  */
 onShow: 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() {

 },

 /**
  * 获取聚焦
  */
 focus: function(e) {
  keyHeight = e.detail.height;
  this.setData({
   scrollHeight: (windowHeight - keyHeight) + 'px'
  });
  this.setData({
   toView: 'msg-' + (msgList.length - 1),
   inputBottom: keyHeight + 'px'
  })
  //计算msg高度
  // calScrollHeight(this, keyHeight);

 },

 //失去聚焦(软键盘消失)
 blur: function(e) {
  this.setData({
   scrollHeight: '100vh',
   inputBottom: 0
  })
  this.setData({
   toView: 'msg-' + (msgList.length - 1)
  })

 },

 /**
  * 发送点击监听
  */
 sendClick: function(e) {
  msgList.push({
   speaker: 'customer',
   contentType: 'text',
   content: e.detail.value
  })
  inputVal = '';
  this.setData({
   msgList,
   inputVal
  });


 },

 /**
  * 退回上一页
  */
 toBackClick: function() {
  wx.navigateBack({})
 }

})

<!--pages/contact/contact.wxml-->

<view>

 <scroll-view scroll-y scroll-into-view='{{toView}}' style='height: {{scrollHeight}};'>
  <!-- <view class='scrollMsg'> -->
  <block wx:key wx:for='{{msgList}}' wx:for-index="index">

   <!-- 单个消息1 客服发出（左） -->
   <view wx:if='{{item.speaker=="server"}}' id='msg-{{index}}' style='display: flex; padding: 2vw 11vw 2vw 2vw;'>
    <view style='width: 11vw; height: 11vw;'>
     <image style='width: 11vw; height: 11vw; border-radius: 10rpx;' src='../../images/contact_member.png'></image>
    </view>
    <view style='width: 4vw; height: 11vw; margin-left: 0.5vw; display: flex; align-items: center; z-index: 9;'>
     <image style='width: 4vw;' src='../../images/left_msg.png' mode='widthFix'></image>
    </view>
    <view class='leftMsg'>{{item.content}}</view>
   </view>

   <!-- 单个消息2 用户发出（右） -->
   <view wx:else id='msg-{{index}}' style='display: flex; justify-content: flex-end; padding: 2vw 2vw 2vw 11vw;'>
    <view class='rightMsg'>{{item.content}}</view>
    <view style='width: 4vw; height: 11vw; margin-right: 0.5vw; display: flex; align-items: center; z-index: 9;'>
     <image style='width: 4vw;' src='../../images/right_msg.png' mode='widthFix'></image>
    </view>
    <view style='width: 11vw; height: 11vw;'>
     <image style='width: 11vw; height: 11vw; border-radius: 10rpx;' src='{{cusHeadIcon}}'></image>
    </view>
   </view>

  </block>
  <!-- </view> -->

  <!-- 占位 -->
  <view style='width: 100%; height: 18vw;'></view>
 </scroll-view>

 <view class='inputRoom' style='bottom: {{inputBottom}}'>
  <image style='width: 7vw; margin-left: 3.2vw;' src='../../images/pic_icon.png' mode='widthFix'></image>
  <input bindconfirm='sendClick' adjust-position='{{false}}' value='{{inputVal}}' confirm-type='send' bindfocus='focus' bindblur='blur'></input>
 </view>
</view>

/* pages/contact/contact.wxss */

page {
 background-color: #f1f1f1;
}

.inputRoom {
 width: 100vw;
 height: 16vw;
 border-top: 1px solid #cdcdcd;
 background-color: #f1f1f1;
 position: fixed;
 bottom: 0;
 display: flex;
 align-items: center;
 z-index: 20;
}

input {
 width: 76vw;
 height: 9.33vw;
 background-color: #fff;
 border-radius: 40rpx;
 margin-left: 2vw;
 padding: 0 3vw;
 font-size: 28rpx;
 color: #444;
}

.leftMsg {
 font-size: 35rpx;
 color: #444;
 line-height: 7vw;
 padding: 2vw 2.5vw;
 background-color: #fff;
 margin-left: -1.6vw;
 border-radius: 10rpx;
 z-index: 10;
}

.rightMsg {
 font-size: 35rpx;
 color: #444;
 line-height: 7vw;
 padding: 2vw 2.5vw;
 background-color: #96EB6A;
 margin-right: -1.6vw;
 border-radius: 10rpx;
 z-index: 10;
}