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。
创建两个文件夹index、new。
以下是代码的实现：
1.应用配置
小程序代码实现的第一步是设置整个应用的配置，修改app.json,示例代码如下：
{
"pages": [
"pages/index/index",
"pages/new/new"
],
"window":{
"backgroundTextStyle":"light",
"navigationBarBackgroundColor":"#3891f8",
"navigationBarTitleText":"小小留言板",
"navigationBarTextStyle": "black"
}
}
index文件夹
wxml：
bindscrolltolower="pullUp-Load"upper-threshold ="0 "scroll-y="true" style = "height: {{win-dowHeight}}px;"> wx:for="{{diaryList}}" wx:key = "diaryItem"url ="/pages/index /detail? ob-jectId={{item.objectId}}&count={{item.count}}" > 主题:{{item.title}}
添加留言
wx:if ="{{modifyDiarys}}"> 修改留言
js :
//引入Bmob逻辑文件及初始化数据
var Bmob = require('../../utils/bmob');
var common = require('../../utils/underscore');
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("happy");//数据表 happy
var query = new Bmob.Query(Diary);
var queryl = new Bmob.Query(Diary);
query. descending('createdAt'); query.include( "own")//查询所有数据
query.limit(that.data.limit);
var mainQuery = Bmob.Query.or(query);
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=new User();
//增加留言
var Diary =Bmob.Object.extend("happy");//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("happy");
//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 == "" ||lmodyContent == ""){
common.showTip('标题或内容不能为空','1oading');}
else {
console.log(modyContent)
var Diary = Bmob.Object.extend("happy");
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 == "" ||lmodyContent == "");{
common.showTip('标题或内容不能为空','1oading');
}
}
else {
that.setData({
modifyDiarys:false
})
common.showTip('修改成功','loading');
}
}
}
},
})
wxss:
page {
height: 100vh;
display: flex;
flex-direction: column;
}
.scrollarea {
flex: 1;
overflow-y: hidden;
}
.userinfo {
display: flex;
flex-direction: column;
align-items: center;
color: #aaa;
width: 80%;
}
.userinfo-avatar {
overflow: hidden;
width: 128rpx;
height: 128rpx;
margin: 20rpx;
border-radius: 50%;
}
.usermotto {
margin-top: 200px;
}
/* .toWrite{
position: absolute;
left: 30px;
width: 300px;
height: 300px;
} */
.avatar-wrapper {
padding: 0;
width: 56px !important;
border-radius: 8px;
margin-top: 40px;
margin-bottom: 40px;
}
/* .weui-panel__hd{
margin-top: 330px;
margin-left: 130px;
} */
.avatar {
display: block;
width: 56px;
height: 56px;
}
.nickname-wrapper {
display: flex;
width: 100%;
padding: 16px;
box-sizing: border-box;
border-top: .5px solid rgba(0, 0, 0, 0.1);
border-bottom: .5px solid rgba(0, 0, 0, 0.1);
color: black;
}
.nickname-label {
width: 105px;
}
.nickname-input {
flex: 1;
}
new文件夹
js:
var Bmob = require('../../utils/bmob');
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");
}
});
}
})
wxml:
浏览次数:{{rows.count}}
wxss:
page {
height: 100vh;
display: flex;
flex-direction: column;
}
.scrollarea {
flex: 1;
overflow-y: hidden;
}
.log-item {
margin-top: 20rpx;
text-align: center;
}
.log-item:last-child {
padding-bottom: env(safe-area-inset-bottom);
}