微信小程序-枯木学习笔记7-考卷页面

Posted 2022-06-24 长安紫薯

功能需求

这个是整个系统中的核心，也是最难，逻辑繁琐，代码量最多，技巧点最多的页面。
实现根据课程，创建考卷（自动随机选择20单选题），展现在页面上；选题时记录下得分；交卷时计算总分，在页面顶部展现。

界面原型

paper.wxml

<view>
    <view class="common-text">
        <text class="common-text-left">
            学号：student.id 
            姓名：student.name
        </text>     
        <text class="common-text-right">
            题号：index+1/detailList.length
        </text>
    </view>    
    <view class="box" hidden="!isUpPaper">
        <view class="score">您的成绩是：scores 分</view>
    </view>

    <view class="box">
        <view class="title">问题：</view>
        <view class="question">detail.problem</view>
    </view>
    <view class="box">
        <view class="title">选项：</view>
        <radio-group>
            <view><radio checked="checkeda" size="mini" bindtap="selectedRadio" data-word="A" data-index="index">A：detail.a</radio></view>
            <view><radio checked="checkedb" bindtap="selectedRadio" data-word="B" data-index="index">B：detail.b</radio></view>
            <view><radio checked="checkedc" bindtap="selectedRadio" data-word="C" data-index="index">C：detail.c</radio></view>
            <view><radio checked="checkedd" bindtap="selectedRadio" data-word="D" data-index="index">D：detail.d</radio></view>
        </radio-group>
    </view>
    <view class="box" hidden="!isUpPaper">
        <view class="title">分析：</view>
        <view class="content">detail.analysis</view>
    </view>
    <view class="box">
        <view class="title">答案：detail.answer</view>
        <view class="title">得分：detail.score</view>
    </view> 

    <view class="line">
        <button class="btn" bindtap="upProblem" size="mini">上一题</button>
        <button class="btn" bindtap="downProblem" size="mini">下一题</button>
        <button class="btn" bindtap="upPaper" disabled="isUpPaper" size="mini">交卷</button>
    </view>
</view>

page.wxss

字体渐变色样式

Page
    font-size: 24rpx;


radio
    margin: 2px;


.common-text 
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    height: 80rpx;
    padding: 0 24rpx;
    background: #fff;
  
  
  .common-text-left 
    font-size: 30rpx;
    color: #333;
    font-weight: 500;
    margin-left: 30rpx;
  
  
  .common-text-right 
    font-size: 26rpx;
    font-weight: 400;
    color: #959595;
    margin-right: 10rpx;
  

.box
    border: 1px solid black;
    margin:10px;
    padding:5px;
    border-radius: 5px;

.score
    font-weight: bold;
    padding-bottom: 5px;
    text-align: center;
    color: red;
    font-size: 50rpx;

.title
    font-weight: bold;
    padding-bottom: 5px;


.question
    background: linear-gradient(to right, black, green);
    -webkit-background-clip: text;
    color: transparent;


.content
    background: linear-gradient(to right, red, black);
    -webkit-background-clip: text;
    color: transparent;


.line
    display: flex;
    text-align: right;


.btn
    color: white;
    background-color:rgb(109, 165, 109);
    width: 50rpx;

page.js

/*
    功能：
    1、学生登录后存储学员信息到本地缓存，从本地缓存读取学生信息，展现在页面顶部
    2、ajax请求后台，创建试卷，将试题封装到detailList对象中，每个detail为一个考题
    3、index记录当前考题号，从0开始
    4、上一题按钮按下时，index--，detail=detailList[index]获取当前考题，在页面展示，注意判断极值已经到达第一题时处理
    5、下一题按钮按下时，index++，detail=detailList[index]获取当前考题，在页面展示，注意判断极值已经到达最后一题时处理
    6、上一题、下一题切换时，单选框已经被选中的问题，清除选择
    6、单选，选择某项时记录下成绩，和detail中的正确答案比对，计算得分，存入数组中对应值
    7、交卷，循环数组计算总分，并通知显示，ajax访问后台，最终提交数据库
*/

const app = getApp();
const myhost = app.globalData.myhost;

Page(
    data: 
        checkeda: false, //标识哪个选项
        checkedb: false,
        checkedc: false,
        checkedd: false,
        scores: 0,          //最终成绩
        resultList: [],     //得分结果数组，索引是题号
        isUpPaper: false,   //是否交卷，交卷就显示分析、得分和答案
        index: 0,           //当前题号
        student: "",        //考试学生信息
        detailList: "",     //试题集合
        detail: ""          //当前题
    ,
    onLoad(options) 
        //准备学生信息
        var student = wx.getStorageSync('student');
        this.setData(
            student: student
        );

        //因为答题结果存在本地缓存中，所以清除，否则就得垃圾数据会影响现有数据
        wx.clearStorage(
            success: (res) => 
                console.log("缓存已清理")
            ,
        )
        wx.setStorageSync('student', student);  //上面清除缓存会导致登录信息丢失，重新缓存

        //准备试卷信息
        var courseid = options.id;
        var url = '/paper/createPaper?id=' + courseid +'&studentid='+student.id;
        console.log(url);

        wx.request(
          url: myhost+'/paper/createPaper?id=' + courseid +'&studentid='+this.data.student.id,
          method: 'POST',
          success: (res)=>
              var list = res.data;
              var resultList = Array(list.length).fill(0);
              this.setData(
                  detailList: list,
                  detail: list[0],
                  resultList: resultList
              )      
          ,
          fail(err)
            console.log(err)
          
        )
    ,
    upProblem(evt)    //向上按钮
        var index = this.data.index;
        index--;
        if(index<0)
            index = 0;
        
            
        //当前选项写缓存
        var word = wx.getStorageSync('whoChecked-'+index);
        //先取消后选择
        this.setData( checkeda: false, checkedb: false, checkedc: false, checkedd: false )
        if(word=='A')
            this.setData( checkeda: true, checkedb: false, checkedc: false, checkedd: false )
        
        if(word=='B')
            this.setData( checkeda: false, checkedb: true, checkedc: false, checkedd: false )
        
        if(word=='C')
            this.setData( checkeda: false, checkedb: false, checkedc: true, checkedd: false )
        
        if(word=='D')
            this.setData( checkeda: false, checkedb: false, checkedc: false, checkedd: true )
           

        var detailList = this.data.detailList;
        this.setData(
            saveHidden: true,
            index: index,
            detail: detailList[index]
        )
    ,
    downProblem(evt)  //向下按钮
        var saveHidden = this.data.saveHidden;
        var index = this.data.index;
        index++;
        
        //当前选项写缓存
        var word = wx.getStorageSync('whoChecked-'+index);
        //先取消后选择
        this.setData( checkeda: false, checkedb: false, checkedc: false, checkedd: false )
        if(word=='A')
            this.setData( checkeda: true, checkedb: false, checkedc: false, checkedd: false )
        
        if(word=='B')
            this.setData( checkeda: false, checkedb: true, checkedc: false, checkedd: false )
        
        if(word=='C')
            this.setData( checkeda: false, checkedb: false, checkedc: true, checkedd: false )
        
        if(word=='D')
            this.setData( checkeda: false, checkedb: false, checkedc: false, checkedd: true )
                                

        var detailList = this.data.detailList;
        if(index >= detailList.length-1)
            index = detailList.length-1;
        
        this.setData(
            index: index,
            detail: detailList[index]
        )
    ,
    upPaper()  //交卷
        var scores = this.data.scores;
        var resultList = this.data.resultList;
        for(var i=0;i<resultList.length;i++)
            scores += resultList[i];
        

        this.setData(
            isUpPaper: true,
            scores: scores
        )
    ,
    selectedRadio(e)   //选择单选框
        var index = this.data.index;
        var value = e.currentTarget.dataset.word;
        //当前选项写缓存
        wx.setStorageSync('whoChecked-'+index, value);

        var detail = this.data.detail;
        var resultList = this.data.resultList;
        //选中的结果和答案比较，正确得5分，不正确得0分
        if(detail.answer == value)
            detail.score = 5;
            resultList[index] = 5;
        else
            detail.score = 0;
            resultList[index] = 0;
        
        this.setData(
            detail: detail,
            resultList: resultList
        )
    
)