pk8f3pmu2/pages/my_courses/my_courses.js

const { Class } = require("../../model/class");
const login = require("../../model/user");
const AV = require("../../lib/av-live-query-weapp-min.js");
const { jsonify } = require('../../utils/leancloudutils');
// pages/class/class.js

const getDataForRender = class_ => ({
  name: class_.get('name'),
  objectId: class_.get('objectId')
});

Page({
  /**
  页面的初始数据data，用于与.wxlm文件绑定
  classes: 课程列表 type: Array
    元素class: 课程信息 class.objectId 唯一
      class.objectId  课程唯一主键
      class.name  课程名称
   */
  data: {
    classes: [],
    loading: true,
  },
  presences: [],
  classes: [],
  add_class:function(event){
    wx.navigateTo({
      url: '../addclass/addclass',
    })
  },
  del_class: function(event){
    class_id = event.currentTarget.dataset.class_id;
    class_name = event.currentTarget.dataset.class_name;
    presence = this.presences.filter(presence=>presence.get("class").id==class_id)[0];
    if(presence==null){
      console.warn("presence not in list, is it the teacher's classroom?")
      return;
    }
    pull_presences = this.pull_presences.bind(this);
    wx.showModal({
      title: '退出学习',
      content: '退出学习会清零你该门课程的分数',
      success(res) {
        if (res.confirm) {
          wx.showLoading({
            title: '请稍候',
          })
          presence.destroy().then(() => {
            pull_presences();
            wx.hideLoading();
            wx.showToast({
              title: '退出成功',
              icon: "success"
            })
          },
            () => {
              wx.hideLoading();
              wx.showToast({
                title: '操作失败',
                icon: "none"
              })
            }).catch(error => console.error(error.message));
     } } });
  },
  enter_class: function(event){
    console.log(event);
    var class_id = event.currentTarget.dataset.class_id;
    var class_name = event.currentTarget.dataset.class_name;
    wx.navigateTo({
      url: "../classroom/classroom?class_id="+class_id+"&"+"class_name="+class_name,
    })
  },

  /**
   * 生命周期函数--监听页面加载
   */
  onLoad: function (options) {
    
  },

  /**
   * 生命周期函数--监听页面初次渲染完成
   */
  onReady: function () {

  },

  pull_presences: function(){
    console.log("classes.pull_presences");
    var query = new AV.Query("Presence");
    query.equalTo("user", AV.User.current());
    query.include("class");
    return query.find().then((presences) => {
      this.presences = presences;
      console.log(presences);
      let classes = presences.map(presence => {return presence.get("class")});
      console.log(classes);
      query = new AV.Query("Class_");
      query.equalTo("teacher", AV.User.current());
      query.include("teacher");
      query.find().then(myclasses=>{
        this.setData(jsonify({classes: classes.concat(myclasses), loading: false}));
      })
      
    }).catch(console.error);
  },
  /**
   * 生命周期函数--监听页面显示
   */
  onShow: function () {
    console.log("classes.onShow()");
    if(this.data.loading){
      wx.showLoading({
        title: '加载中',
      })
    }
    this.pull_presences().then(wx.hideLoading);
  },

  /**
   * 生命周期函数--监听页面隐藏
   */
  onHide: function () {

  },

  /**
   * 生命周期函数--监听页面卸载
   */
  onUnload: function () {

  },

  /**
   * 页面相关事件处理函数--监听用户下拉动作
   */
  onPullDownRefresh: function () {
    this.pull_presences();
  },

  /**
   * 页面上拉触底事件的处理函数
   */
  onReachBottom: function () {

  },

  /**
   * 用户点击右上角分享
   */
  onShareAppMessage: function () {

  }
})