微信小程序实现聊天对话(文本、图片)功能

<!--pages/index/to_news/to_news.wxml-->
<view class='tab'>
 <view class='lan'>{{tabdata.title}}</view>
 <view class='tent'>
  <text>{{tabdata.attribute_attribute}}</text>
  <text class='fl_r '>{{tabdata.num}}</text>
 </view>
 <view class='xiahuaxian1'></view>
 <view>
  <text class='fabu'>发布时间: {{tabdata.time_agree}}</text>
 </view>
</view>
<view class='news'>
 <view class='xiahuaxian1 xiahuaxia'></view>
 <view class='new_top_txt'>您正在与{{tabdata.nickname}}进行沟通</view>
 <view class="historycon">
  <scroll-view scroll-y="true" scroll-top="{{scrollTop}}" class="history" wx:for="{{centendata}}" wx:key=''>
   <view>
    <text class='time'>{{item.time}}</text>
   </view>
   <block wx:if="{{item.is_show_right ==1}}">
    <view class='my_right'>
     <view class='page_row'>
      <text wx:if='{{!item.is_img}}' class='new_txt'>{{item.content}}</text>
      <image wx:if='{{item.is_img}}' src='http://sz800800.cn/Uploads/{{item.content}}' class='new_imgtent'></image>
      <view wx:if='{{!item.is_img}}' class='sanjiao my'></view>
      <image class='new_img' wx:if='{{item.show_rignt == "是自己的内容，显示在右边，右边渲染 nickname_owner，head_owner"}}' src='{{item.head_owner}}'></image>
       <image class='new_img' wx:if='{{item.show_rignt == "是自己的内容，显示在右边，右边渲染 nickname_open，head_open"}}' src='{{item.head_open}}'></image>
     </view>
    </view>
   </block>
   <block wx:else>
    <view class='you_left'>
     <view class='page_row'>
      <image class='new_img' wx:if='{{item.show_rignt == "不是自己的内容，显示在左边，左边渲染 nickname_owner，head_owner"}}' src='{{item.head_owner}}'></image>
       <image class='new_img' wx:if='{{item.show_rignt == "不是自己的内容，显示在左边，左边渲染 nickname_open，head_open"}}' src='{{item.head_open}}'></image>
      <view wx:if='{{!item.is_img}}' class='sanjiao you'></view>
      <text wx:if='{{!item.is_img}}' class='new_txt'>{{item.content}}</text>
      <image wx:if='{{item.is_img}}' src='http://sz800800.cn/Uploads/{{item.content}}' class='new_imgtent'></image>
     </view>
    </view>
   </block>
  </scroll-view>
 </view>
</view>
<view class='hei' id="hei"></view>
<view class="sendmessage">
 <input type="emoji" bindinput="bindChange" confirm-type="done" value='{{news_input_val}}' placeholder="" />
 <button catchtap="add">发送</button>
 <input style='display:none' type="" bindinput="bindChange" confirm-type="done" placeholder="" />
 <image bindtap="upimg1" class='jia_img' src='../../../images/jia_img.png'></image>
</view>

// pages/index/to_news/to_news.js
var app = getApp();
var util = require("../../../utils/util.js")
var message = '';
var text = '';
var user = {};
var length;
var zx_info_id;
var openid_talk;
Page({
 data: {
  news: '',
  scrollTop: 0,
  message: '',
  text: text,
  centendata: '',
  nickName: '',
  avatarUrl: '',
  news_input_val:'',
  tabdata: ''
 },
 bindChange: function (e) {
  message = e.detail.value
 },
 //事件处理函数
 add: function (e) {
  var that = this
  var data = {
   program_id: app.jtappid,
   openid: app._openid,
   zx_info_id: zx_info_id,
   content: message,
   openid_talk:openid_talk
  }
  util.request('pg.php/ZXinfo/session_submit', 'post', data, '正在加载数据', function (res) {
   if (res.data.state == 1) {
    var a = true;
    that.loaddata(a);
    that.setData({
     news_input_val:''
    })
    message = ''
   } else {
    wx.showToast({
     title: '网络错误,请稍后',
    })
   }
  })
 },
 
 onLoad: function (options) {
  openid_talk = options.openid_talk;
  zx_info_id = options.zx_info_id;
  console.log(openid_talk)
  //调用应用实例的方法获取全局数据
  this.setData({
   zx_info_id: zx_info_id,
   nickName: app.nickName,
   avatarUrl: app.avatarUrl,
  });
  this.loaddata()
 },
 // 页面加载
 loaddata: function (a) {
  var that = this;
  var is_img = true;
  var data = {
   program_id: app.jtappid,
   openid: app._openid,
   zx_info_id: zx_info_id,
   openid_talk: openid_talk
  }
  util.request('pg.php/ZXinfo/session_page', 'post', data, '', function (res) {
   if (res.data.k1) {
    res.data.k1.time_agree = util.js_date_time(res.data.k1.time_agree)
   }
   for (var i = 0; i < res.data.k2.length; i++) {
    res.data.k2[i].time = util.js_date_time(res.data.k2[i].time)
    var n = res.data.k2[i].content.charAt(res.data.k2[i].content.length - 1);
    switch (n) {
     case 'g':
      res.data.k2[i].is_img = is_img
      break;
     default:
    }
   }
   that.setData({
    tabdata: res.data.k1,
    centendata: res.data.k2.reverse()
   })
   wx.setNavigationBarTitle({ title: that.data.tabdata.nickname });
   if (a) {
    setTimeout(function () {
      that.bottom()
    }, 500);
   }
  })
  setTimeout(function () {
   if (that.data.centendata.length != length) {
    length = that.data.centendata.length
   }
   that.loaddata()
  }, 3000);
  
 },
 // 获取hei的id节点然后屏幕焦点调转到这个节点
 bottom: function () {
  var query = wx.createSelectorQuery()
  query.select('#hei').boundingClientRect()
  query.selectViewport().scrollOffset()
  query.exec(function (res) {
   wx.pageScrollTo({
    scrollTop: res[0].bottom // #the-id节点的下边界坐标
   })
   res[1].scrollTop // 显示区域的竖直滚动位置
  })
 },
 // 选择图片并把图片保存 
 upimg1: function () {
  var that = this;
  wx.chooseImage({
   success: function (res) {
    var data = {
     program_id: app.jtappid,
     openid: app._openid,
     zx_info_id: zx_info_id,
    }
    var tempFilePaths = res.tempFilePaths
    wx.uploadFile({
     url: 'pg.php/ZXinfo/session_submit', //提交信息至后台
     filePath: tempFilePaths[0],
     name: 'content', //文件对应的参数名字(key)
     formData: data, //其它的表单信息
     success: function (res) {
      var a = true;
      that.loaddata(a);
      message = ''
     }
    })
   }
  })
 }
})

/* pages/index/to_news/to_news.wxss */
 
page {
 background-color: #f7f7f7;
}
 
.tab {
 padding: 20rpx 20rpx 40rpx 50rpx;
 height: 20%;
 background-color: white;
}
 
.tab .tent {
 font-size: 33rpx;
 margin-bottom: 30rpx;
}
.jia_img{
 height: 80rpx;
 width: 90rpx;
}
.new_imgtent{
  height: 180rpx;
 width: 190rpx;
}
.tab .fabu {
 font-size: 33rpx;
 margin-top: 30rpx;
 margin-bottom: 30rpx;
}
 
.xiahuaxia {
 width: 80%;
 text-align: center;
 margin: 0 auto;
 position: relative;
 top: 60rpx;
}
 
.time {
 text-align: center;
 padding: 5rpx 20rpx 5rpx 20rpx;
 width: 200rpx;
 font-size: 26rpx;
 background-color: #E8E8E8;
}
 
.new_top_txt {
 width: 50%;
 position: relative;
 top: 38rpx;
 text-align: center;
 margin: 0 auto;
 font-size: 30rpx;
 color: #787878;
 background-color: #f7f7f7;
}
 
/* 聊天内容 */
 
.news {
 margin-top: 30rpx;
 text-align: center;
 margin-bottom: 150rpx;
}
 
.img_null {
 height: 60rpx;
}
 
.l {
 height: 5rpx;
 width: 20%;
 margin-top: 30rpx;
 color: #000;
}
 
/* 聊天 */
 
.my_right {
 float: right;
 position: relative;
 right: 40rpx;
}
 
.you_left {
 float: left;
 position: relative;
 left: 5rpx;
}
 
.new_img {
 width: 100rpx;
 height: 100rpx;
 border-radius: 50%;
}
 
.new_txt {
 width: 380rpx;
 border-radius: 7px;
 background-color: #95d4ff;
 padding: 0rpx 30rpx 0rpx 30rpx;
}
 
.sanjiao {
 top: 20rpx;
 position: relative;
 width: 0px;
 height: 0px;
 border-width: 10px;
 border-style: solid;
}
 
.my {
 border-color: transparent transparent transparent #95d4ff;
}
 
.you {
 border-color: transparent #95d4ff transparent transparent;
}
 
.sendmessage {
 background-color: white;
 width: 100%;
 position: fixed;
 bottom: 0rpx;
 display: flex;
 flex-direction: row;
}
 
.sendmessage input {
 width: 80%;
 height: 40px;
 background-color: white;
 line-height: 40px;
 font-size: 14px;
 border: 1px solid #d0d0d0;
 padding-left: 10px;
}
 
.sendmessage button {
 border: 1px solid white;
 width: 18%;
 height: 40px;
 background: #fff;
 color: #000;
 line-height: 40px;
 font-size: 14px;
}
 
.historycon {
 height: 90%;
 width: 100%;
 flex-direction: column;
 display: flex;
 margin-top: 100rpx;
 border-top: 0px;
}
.hei{
 margin-top: 50px;
 height: 20rpx;
}
.history {
 height: 100%;
 margin-top: 15px;
 margin: 10px;
 font-size: 14px;
 line-height: 40px;
 word-break: break-all;
}