详解微信小程序开发聊天室—实时聊天，支持图片预览

<view class="news" bindtap='outbtn'> <view class="chat-notice" wx:if="{{userInfo}}">系统消息: 欢迎 {{ userInfo.nickName }} 加入群聊</view> <view class="historycon"> <scroll-view scroll-y="true" class="history" scroll-top="{{scrollTop}}"> <block wx:for="{{newslist}}" wx:key>     <!-- 历史消息 --> <!-- <view class="chat-news"><view style="text-align: left;padding-left: 20rpx;"><image class='new_img' src="{{item.avatarUrl? item.avatarUrl:'images/avator.png'}}"></image><text class="name">{{ item.nickName }}{{item.date}}</text></view><view class='you_left'><block wx:if="{{item.type=='text'}}"><view class='new_txt'>{{item.content}}</view></block><block wx:if="{{item.type=='image'}}"><image class="selectImg" src="{{item.images}}"></image></block></view></view> --> <view>{{item.date}}</view> <!--自己的消息 --> <view class="chat-news" wx:if="{{item.nickName == userInfo.nickName}}"> <view style="text-align: right;padding-right: 20rpx;"> <text class="name">{{ item.nickName }}</text> <image class='new_img' src="{{userInfo.avatarUrl}}"></image> </view> <view class='my_right'> <block wx:if="{{item.type=='text'}}"> <view class='new_txt'>{{item.content}}</view> </block> <block wx:if="{{item.type=='image'}}"> <image class="selectImg" src="{{item.images}}" data-src="{{item.images}}" lazy-load="true" bindtap="previewImg"></image> </block> </view> </view> <!-- 别人的消息 --> <view class="chat-news" wx:else> <view style="text-align: left;padding-left: 20rpx;"> <image class='new_img' src="{{item.avatarUrl? item.avatarUrl:'images/avator.png'}}"></image> <text class="name">{{ item.nickName }}</text> </view> <view class='you_left'> <block wx:if="{{item.type=='text'}}"> <view class='new_txt'>{{item.content}}</view> </block> <block wx:if="{{item.type=='image'}}"> <image class="selectImg" src="{{item.images}}" data-src="{{item.images}}" lazy-load="true" bindtap="previewImg"></image> </block> </view> </view> </block> </scroll-view> </view> </view> <view id="flag"></view> <!-- 聊天输入 --> <view class="message"> <form bindreset="cleanInput" class="sendMessage"> <input type="text" placeholder="请输入聊天内容.." value="{{massage}}" bindinput='bindChange'></input> <view class="add" bindtap='increase'>+</view> <button type="primary" bindtap='send' formType="reset" size="small" button-hover="blue">发送</button> </form> <view class='increased {{aniStyle?"slideup":"slidedown"}}' wx:if="{{increase}}"> <view class="image" bindtap='chooseImage'>相册 </view> </view> </view>

var url = 'ws://........';//服务器地址   function connect(user,func) { wx.connectSocket({ url: url, header:{'content-type': 'application/json'}, success: function () { console.log('信道连接成功~') }, fail: function () { console.log('信道连接失败~') } }) wx.onSocketOpen(function (res) { wx.showToast({ title: '信道已开通~', icon: "success", duration: 2000 }) //接受服务器消息 wx.onSocketMessage(func);//func回调可以拿到服务器返回的数据 }); wx.onSocketError(function (res) { wx.showToast({ title: '信道连接失败，请检查！', icon: "none", duration: 2000 }) }) } //发送消息 function send(msg) { wx.sendSocketMessage({ data: msg }); } module.exports = { connect: connect, send: send }

// pages/chat/chat.js const app = getApp() var websocket = require('../../utils/websocket.js'); var utils = require('../../utils/util.js'); Page({   /*** 页面的初始数据*/ data: { newslist:[], userInfo: {}, scrollTop: 0, increase:false,//图片添加区域隐藏 aniStyle: true,//动画效果 message:"", previewImgList:[] }, /*** 生命周期函数--监听页面加载*/ onLoad: function () { var that = this if (app.globalData.userInfo) { this.setData({ userInfo: app.globalData.userInfo }) } //调通接口 websocket.connect(this.data.userInfo, function (res) { // console.log(JSON.parse(res.data)) var list = [] list = that.data.newslist list.push(JSON.parse(res.data)) that.setData({ newslist: list }) }) }, // 页面卸载 onUnload(){ wx.closeSocket(); wx.showToast({ title: '连接已断开~', icon: "none", duration: 2000 }) }, //事件处理函数 send: function () { var flag = this if (this.data.message.trim() == ""){ wx.showToast({ title: '消息不能为空哦~', icon: "none", duration: 2000 }) }else { setTimeout(function(){ flag.setData({ increase: false }) },500) websocket.send('{ "content": "' + this.data.message + '", "date": "' + utils.formatTime(new Date()) + '","type":"text", "nickName": "' + this.data.userInfo.nickName + '", "avatarUrl": "' + this.data.userInfo.avatarUrl+'" }') this.bottom() } }, //监听input值的改变 bindChange(res) { this.setData({ message : res.detail.value }) }, cleanInput(){ //button会自动清空，所以不能再次清空而是应该给他设置目前的input值 this.setData({ message: this.data.message }) }, increase() { this.setData({ increase: true, aniStyle: true }) }, //点击空白隐藏message下选框 outbtn(){ this.setData({ increase: false, aniStyle: true }) }, //发送图片 chooseImage() { var that = this wx.chooseImage({ count: 1, // 默认9 sizeType: ['original', 'compressed'], // 可以指定是原图还是压缩图，默认二者都有 sourceType: ['album', 'camera'], // 可以指定来源是相册还是相机，默认二者都有 success: function (res) { // 返回选定照片的本地文件路径列表，tempFilePath可以作为img标签的src属性显示图片 var tempFilePaths = res.tempFilePaths // console.log(tempFilePaths) wx.uploadFile({ url: 'http://.....', //服务器地址 filePath: tempFilePaths[0], name: 'file', headers: { 'Content-Type': 'form-data' }, success: function (res) { if (res.data){ that.setData({ increase: false }) websocket.send('{"images":"'+ res.data +'","date":"'+utils.formatTime(new Date())+'","type":"image","nickName":"'+that.data.userInfo.nickName+'","avatarUrl":"'+that.data.userInfo.avatarUrl+'"}') that.bottom() } } }) } }) }, //图片预览 previewImg(e){ var that = this //必须给对应的wxml的image标签设置data-set=“图片路径”，否则接收不到 var res = e.target.dataset.src var list = this.data.previewImgList //页面的图片集合数组 //判断res在数组中是否存在，不存在则push到数组中, -1表示res不存在 if (list.indexOf(res) == -1 ) { this.data.previewImgList.push(res) } wx.previewImage({ current: res, // 当前显示图片的http链接 urls: that.data.previewImgList // 需要预览的图片http链接列表 }) }, //聊天消息始终显示最底端 bottom: function () { var query = wx.createSelectorQuery() query.select('#flag').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 }) }, })

/* pages/chat/chat.wxss */ page { background-color: #f7f7f7; height: 100%; } /* 聊天内容 */ .news { padding-top: 30rpx; text-align: center; /* height:100%; */ box-sizing:border-box; } #flag{ margin-bottom: 100rpx; height: 30rpx; } .chat-notice{ text-align: center; font-size: 30rpx; padding: 10rpx 0; color: #666; } .historycon { height: 100%; width: 100%; /* flex-direction: column; */ display: flex; border-top: 0px; } /* 聊天 */ .chat-news{ width: 100%; overflow: hidden; } .chat-news .my_right { float: right; /* right: 40rpx; */ padding: 10rpx 10rpx; } .chat-news .name{ margin-right: 10rpx; } .chat-news .you_left { float: left; /* left: 5rpx; */ padding: 10rpx 10rpx; } .selectImg{ display: inline-block; width: 150rpx; height: 150rpx; margin-left: 50rpx; } .my_right .selectImg{ margin-right: 80rpx; } .new_img { width: 60rpx; height: 60rpx; border-radius: 50%; vertical-align: middle; margin-right: 10rpx; } .new_txt { max-width: 300rpx; display: inline-block; border-radius: 6rpx; line-height: 60rpx; background-color: #95d4ff; padding: 5rpx 20rpx; margin: 0 10rpx; margin-left: 50rpx; } .my_right .new_txt{ margin-right:60rpx; } .you{ background-color: lightgreen; } .my { border-color: transparent transparent transparent #95d4ff; } .you { border-color: transparent #95d4ff transparent transparent; } .hei{ margin-top: 50px; height: 20rpx; } .history { height: 100%; margin-top: 15px; padding: 10rpx; font-size: 14px; line-height: 40px; word-break: break-all; } ::-webkit-scrollbar { width: 0; height: 0; color: transparent; z-index: -1; }   /* 信息输入区域 */ .message{ position: fixed; bottom:0; width: 100%; } .sendMessage{ display: block; height: 80rpx; padding: 10rpx 10rpx; background-color: #fff; border-top: 2rpx solid #eee; border-bottom: 2rpx solid #eee; z-index:3; } .sendMessage input{ float:left; width: 66%; height: 100%; line-height: 80rpx; border-bottom: 1rpx solid #ccc; padding:0 10rpx; font-size: 35rpx; color: #666; } .sendMessage view{ display: inline-block; width: 80rpx; height: 80rpx; line-height: 80rpx; font-size: 60rpx; text-align: center; color: #999; border: 1rpx solid #ccc; border-radius: 50%; margin-left: 10rpx; } .sendMessage button { float: right; font-size: 35rpx; } .increased{ width:100%; /* height: 150rpx; */ padding: 40rpx 30rpx; background-color: #fff; } .increased .image{ width: 100rpx; height: 100rpx; border: 3rpx solid #ccc; line-height: 100rpx; text-align: center; border-radius: 8rpx; font-size:35rpx; } @keyframes slidedown { from { transform: translateY(0); } to { transform: translateY(100%); } } .slidedown { animation: slidedown 0.5s linear ; } .slideup { animation: slideup 0.5s linear ; } @keyframes slideup { from { transform: translateY(100%); } to { transform: translateY(0); } }