微信小程序留言板

需求分析
留言板是一款能实现浏览留言、发表留言、删除留言和编辑留言的小程序，用户能够浏览当前的已留言内容，并且能按照时间的升序来查看最新的留言内容；能够发表自己的留言内容，在留言发表页填写相关项后即可发表，并能查看到新留言内容；能够删除不需要的留言；能够修改留言内容。因此，简单留言板的功能主要为显示留言、发表留言、删除留言和编辑留言。

代码实现
app.json代码如下：
{
  "pages": [
    "pages/deta/deta",
    "pages/detail/detail"
  ],
  "window":{
  "backgroundTextStyle":"light",
  "navigationBarBackgroundColor":"#3891f8",
  "navigationBarTitleText":"小小留言板",
  "navigationBarTextStyle": "black"
  }
}
deta.wxml代码如下：
<image class ="toWrite " src ="../image/abb.png"/>
<!-- 显示留言 -->
<view class = "page">
<scroll-view lower-threshold="800"
bindscrolltolower="pullUp-Load"upper-threshold ="0 "scroll-y="true"
style = "height: {{win-dowHeight}}px;">
<view class ="page__bd">
<view class = "weui-panel__hd" bindtap ="toAddDiary">留言列表</view><view>
<block wx:if="{{diaryList.length >0}}">
<navigator class="weui-media-box weui-media-box_text"
wx:for="{{diaryList}}"
wx:key = "diaryItem"url ="/pages/detail/detail? ob-jectId={{item.objectId}}&count={{item.count}}" >
<view class="title">
主题:{{item.title}}</view>
<view class ="content">留言内容:{{item.content}}</view><view class= "info">
<view class="time">时间:{{item.updatedAt}}</view ><view class="count">浏览:{{item.count}}</view>
<view class="operate">
<icon type ="cancel dels"size ="16" > </icon>
<text class ="del"catchtap ="deleteDiary"data-id ="iitem.objectId}}">删除</text>
<icon type="success edits"size="16"></icon>
<text catchtap ="toModifyDiary" data-id ="{{item.objectId}}"data-content="{{item.content}}"data-title="{{item.title}}">编辑</text>
</view>
</view>
</navigator>
</block>
</view>
</view>
</scroll-view>
</view>
<!-- 添加留言 -->
<view class ="js dialog" id="androidDialog1" style="opacity:1;"wx:if="{{writeDiary}}">
<view class="weui-mask"></view>
<view class ="weui-dialog weui-skin_android">
<view class="weui-dialog__hd">
<strong class="weui-dialog__title">添加留言</strong>
</view>
<form bindsubmit="addDiary" report-submit="true">
<view class="weui-dialog__bd">
<view class="weui-cells__title">标题</view>
<view class="weui-cells weui-cells after-title" >
<view class="weui-cell weui-cell input">
<view class="weui-cell__bd">
<input class="weui-input" name="title" placeholder="请输入标题"/>
</view>
</view>
</view>
<view class ="weui-cel1s title">留言内容</view>
<view class="weui-cells weui-cells after-title">
<view class="weui-cell">
<view class="weui-cell bd">
<textarea  class ="weui-textarea"name ="content"placeholder ="请输入留言内容"style="height:3.3em"/> 
</view>
</view>
</view>
<view class="pic">
<view class ="pictext"bindtap="uppic">添加图片</view><block wx:if="{isTypeof(url)})"><view class="weui-textarea-counter">0/200</view>
<image src="../images/xigua.png"/>
</block>
<block wx:else>
<image src="{{url}}"/>
</block>
</view>
</view >
<view class="weui-dialog ft">
<view class ="weui -dialog btn weui -dialog btn default" bindtap="noneWindows">取消</view>
<button loading="{{loading}}"
class="weui-dialog__btn weui-diaLog__btn__primary"formType="submit">提交</button>
</view>
</form>
</view>
</view>
<!-- 修改留言 -->
<view class ="js_dialog"id="androidDialog2"style ="opacity: 1;"
wx:if ="{{modifyDiarys}}">
<view class="weui-mask"></view>
<view class="weui-dialog weui-skin android">
<view class="weui-dialog hd">
<strong class="weui-dialog title">修改留言</strong>
</view >
<form bindsubmit="modifyDiary">
<view class="weui-dialog bd">
<view class="weui-cells title">标题</view>
<input class ="weui =input"name ="title" value ="inowTitle"placeholder="请输入标题"/>
<view class="weui-cells title">留言内容</view>
<view class="weui-cells weui-cells after-title">
<view class="weui-cell">
<view class="weui-cell bd">
<textarea class ="weui-textarea"name ="content"value ="{{nowContent}}"placeholder="请输入留言内容"style="height:3.3em"/>
<view class="weui-textarea-counter">0/200 </view>
</view>
</view>
</view >
</view>
<view class="weui-dialog ft">
<view class="weui-dialog btn weui -dialog btn_default" bindtag="noneWindows">取消</view>
<button loading ="{{loading}}" formType="submit">提交</button>
</view>
</form>
</view>
</view>
deta.js代码如下：
//引入Bmob逻辑文件及初始化数据
var Bmob = require('../../utils/bmob.js');
var common = require('../../utils/common.js'); 
var app = getApp(); 
var that; 
var url = ""
 Page({
data:{
writeDiary:false,//写留言 
loading:false,
windowHeight:0,//定义窗口高度 
windowWidth:0,//定义窗口宽度
limit:10, //定义数据提取条数
diaryList:[],//定义数据列表 
modifyDiarys:false
},
//获取并显示留言数据
onShow:function(){
  getList(this);
  wx.getSystemInfo({ success:(res) => { that.setData({
  windowHeight:res.windowHeight, windowWidth:res.windowWidth
  })
}
  })
  /*
  *获取数据*/
  function getList(t,k){ 
    that =t;
  var Diary = Bmob.Object.extend("test");//数据表 test
  var query = new Bmob.Query(Diary); 
  var queryl = new Bmob.Query(Diary);
  var query1；  
  query. descending('createdAt'); query.include( "own")//查询所有数据
  query.limit(that.data.limit);  
  var mainQuery = Bmob.Query.or(query,query1); mainQuery.find({
  success:function(results){//循环处理查询到的数据
  console.log(results); 
  that.setData({
  diaryList:results
})
},
  error:function(error){
  console.log("查询失败:"+error.code +"" + error.message);
}
  });
}
//添加数据 
},
toAddDiary:function() {
  that.setData({
  writeDiary:true
  })
},
  //添加图片
  uppic:function(){
  var that = this;
  wx.chooseImage({
  count:1,//默认9
  sizeType:['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){
  var tempFilePaths=res.tempFilePaths;
  if(tempFilePaths.length >0){
  var newDate =new Date();
  var newDateStr=newDate.toLocaleDateString();//获取当前日期做文件主
  var tempFilePath=[tempFilePaths[0]];
  var extension=/\([^.]*)$/.exec(tempFilePath[0]);//获取文件扩展名
  if(extension){
  extension =extension[1].toLowerCase();
  }
  var name =newDateStr+"."+extension;//上传的图片的别名
  var file = new Bmob.File(name,tempFilePaths);
  file.save().then(function(res){
    console.log(res.url());
  url = res.url();
  that.setData({
    url:ur1
  })
   },
   function(error){
  console.log(error);
   }
  )
}
}
  })
},
  //添加留言数据
  addDiary:function(event){
  var title =event.detail.value.title;
  var content=event.detail.value.content;
  var formId =event.detail.formId;
  console.log("event".event)
if(! title){
common.showTip("标题不能为空","loading");
elseif(! content)
common.showTip("内容不能为空","loading");
}
else
that.setData({
loading:true
})
var currentUser=Bmob.User.current();
var User =Bmob.Object.extend("User");var UserModel=newUser();
//增加留言
var Diary =Bmob.Object.extend("test");//数据表 
var diary =new Diary();
diary.set("title",title);保存title字段内容
diary.set("formId",formId);//保存 formId
diary.set("content",content);//保存content字段内容
diary.set("image",url)//保存图片地址
diary.set("count",1)//保存浏览次数
if(currentUser){ 
UserModel.id =currentUser.id;
diary.set("own",UserModel);
}
//添加数据,第一个入口参数是nu11
diary.save(null,{
success:function(result){
  common.showTip('添加日记成功');
  that.setData({
    writeDiary:false,
    loading:false
  })
    var currentUser =Bmob.User.current();
    that.onShow();
  },
    error:function(result,error){//添加失败
    common.showTip('添加留言失败,请重新发布','loading');
    }
});
}, 
    //删除留言
deleteDiary:function(event){
var that =this;
var objectId=event.target.dataset.id;
wx.showModal({
title:'操作提示',
content:'确定要删除要留言?',
success:function(res){
if(res.confirm){
//删除留言
var Diary = Bmob.Object.extend("test");
//创建查询对象,入口参数是对象类的实例 
var query =new Bmob.Query(Diary);
query.get(objectId,{
  success:function(object){
//The object was retrieved successfully. 
object.destroy({
success:function(deleteObject){
console.log('删除留言成功');
getList(that)
},
error:function(object,error){
  console.log('删除留言失败');
}
});
},
error,function(object,error){
console.log("query object fail");
}
});
}
}
})
},
toModifyDiary:function(event){
  var nowTile =event.target.dataset.title;
  var nowContent =event.target.dataset.content;
  var nowId =event.target.dataset.id;
that.setData({
modifyDiarys :true,
nowTitle:nowTile,
nowContent:nowContent,
nowId:nowId
})
modifyDiary,function(e){
  var t =this;
  modify(t,e)
  function modify(t,e){
    var that = t;//修改日记
   var modyTitle = e.detail.value.title;
   var modyContent = e.detail.value.content; 
   var objectId =e.detail.value.content; 
   var thatTitle = that.data.nowTitle;
   var thatContent= that.data.nowContent;
   if((modyTitle != thatTitle ||modyContent != thatContent))
   { if(modyTitle == "" ||modyContent == ""){
   common.showTip('标题或内容不能为空','1oading');}
   else {
   console.log(modyContent)
   var Diary = Bmob.Object.extend("test"); 
   var query = new Bmob.Query(Diary);
   //这个id是要修改条目的id,你在生成这个存储并成功时可以获取到,请看前面的文档
   query.get(that.data.nowId,{
   success:function(result){
   
   //回调中可以取得这个GameScore对象的一个实例,然后就可以修改它了
   result.set('title',modyTitle);
   result.set('content',modyContent);
    result.save();
   common.showTip('留言修改成功','success',function(){ that.onShow(); that.setData({
   modifyDiarys:false
   })
  });
  },
   error:function(object,error){
  }
  });
   }
   elseif(modyTitle == "" ||modyContent == "");{
    common.showTip('标题或内容不能为空','1oading');
    }
  }  
    else {
    that.setData({
    modifyDiarys:false
    })
    common.showTip('修改成功','loading');
    }
  }
  }
}, 
})
detail.wxml代码如下：
<view class= "page">
<view>
<view>
<view>留言主题:</view>
<view>{{rows.title}}</view><view>
<view>留言内容:</view>
<view>{{rows.content}}</view>
<view class = "pic">
<image  src="{{rows.image}}"/></view><view>
浏览次数:{{rows.count}}</view >
<view>创建时间:{{rows.createdAt}} </view>
</view></view></view>
<view class="footer">
<text> Copyright©2017-2019www.smartbull.cn</text></view ></view>
detail.js代码如下：
var Bmob = require('../../utils/bmob.js');
 Page({ data:{
  rows:{} //留言详情
},
  onLoad:function(e){
  //页面初始化options为页面跳转所带来的参数
  console.log(e.objectId) 
  var objectid = e.objectid; 
  var newcount =e.count; 
  var that = this;  
  var Diary = Bmob.Object.extend("test"); 
  var query = new Bmob.Query(Diary);  
  query.get(objectId,{
  success:function(result) {
  console.log(result);  
  that.setData({ rows:result,})  
  newcount = parseInt(newcount)+1//浏览次数加1 
  result.set("count",newcount)//保存浏览次数 result.save()
  },
  error:function(result,error){ console.log("查询失败");
  }
  });
}
 })
效果图如下：


                        
原文链接：https://blog.csdn.net/2401_83190888/article/details/138845550