【Angular2】基于localStorage实现本地备份操作记录

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引言

项目中需要对用户的操作记录备份起来,如果后端出现任何问题,可以从前端把用户操作记录提取出来,然后后期把数据导入到数据库

功能

网络监测
1.监测每条记录的提交情况,分辨出是客户端和服务器问题;
2.呼吸灯动态显示当前整体提交状况;
3.监控中心可以查看每条记录的提交情况;
4.监控中心可以控制对每条记录的监控状态;
5.监控中心可以切换网络监测的开闭模式;

智能提交
1.监控中心每隔10秒监测一次提交情况,如果发现有没有提交成功的内容,会在监听到有提交成功的时刻,自动提交所有没有提交成功的记录;
2.监控中心可以切换智能提交的开闭模式;

自动备份
1.监控中心会在最后的时刻将所有用户的操作记录下载到本地;
2.监控中心可以切换自动备份的开闭模式;

设计思路

1.首先各个题型组件在调取服务之后,通过服务返回的值来判断提交情况,并记录操作,如果有问题则为服务端故障,同时更新网络状态;

2.如果调取服务出现任何异常导致无法获取返回值,则为客户端问题,记录操作并标记,同时更新网络状态;

3.呼吸灯实时监测网络状态,累计3次故障后客户端报警;

4..进入监控中心,读取所有操作记录及其标记显示提交情况,同时根据具体情况选择性的关闭对应的记录的监测(否则会一直报警);

5.在操作的过程中,如果发现有没有提交成功的操作,同时监测到最近有提交成功,那么就把之前没有提交成功的操作重新自动提交;

6..监控中心如果出现很多问题或者关键性问题,可以开启备份操作下载功能用户操作完成之后会把操作自动下载到本地;

代码说明

各题目组件 ts

/* 向后台提交学生答案 */
  public updateStudentAnswerToBackend(answer: Answer) {
    let url: string = "examinationEvaluation-web/onlineExam/updatePaperRecordByRecord" + this.authGuardService.getTicket();
    let body: string = JSON.stringify(answer);
    this.exampapaerservice.post(url,body).subscribe(
      res => {
        if (res.json().code == "1111" || res.json().data != true) {
          this.backupAnswer(answer,1); //备份答案
        } else {
          this.backupAnswer(answer,0); //备份答案
        }
      }
    );
    console.log("学生提交答案-radio");
  }
/* 备份用户答案 */
  private backupAnswer(answer: Answer,status: number) {
    //备份答案记录
    console.log("answer-backup-log---"+ExamPaperService.userOperationAmount);
    ExamPaperService.userOperationAmount++; //操作序号递增
    localStorage.setItem("userOperationAmount",ExamPaperService.userOperationAmount.toString()); //记录操作序号
    localStorage.setItem(answer.studentId + ExamPaperService.userOperationAmount,JSON.stringify(answer) + status); //记录操作内容
    //记录提交情况
    let flag: boolean = true;
    let ns: string[] = JSON.parse(localStorage.getItem("NetWorkState"));
    for (var i = 0; i < ns.length; i++) {
      if (answer.questionMainId == ns[i]) { flag = false; }
    }
    if (status != 0 && flag) {
      ns[0] = (parseInt(ns[0]) + 1).toString();
      localStorage.setItem("NetWorkState",JSON.stringify(ns));
    }
  }

公共服务 ts

/* 处理失败提交 */
  public handleUpdateAnswerError(error: Response) {
    //保存用户答案到localStorage
    let answer: Answer = <Answer>(JSON.parse(ExamPaperService.studentAnswer));
    this.backupAnswer(answer,2);
    return Observable.throw(error.json().error || '网络问题:server error');
  }
/* 备份用户答案 */
  private backupAnswer(answer: Answer,status: number) {
    //备份答案记录
    console.log("answer-backup-log---" + ExamPaperService.userOperationAmount);
    ExamPaperService.userOperationAmount++; //操作序号递增
    localStorage.setItem("userOperationAmount",JSON.stringify(ns));
    }
  }

监控中心 ts

ngOnInit() {
    //获得当前操作数量
    this.getUserOperationAmount();
    //初始化网络状态
    let networkList: string[] = [];
    networkList.push("0");
    localStorage.setItem("NetWorkState",JSON.stringify(networkList));
    //初始化备份模式
    localStorage.setItem("NetWorkBackupPattern","0");
    //开始监测
    this.startMonitorNetworkStatus();
  }
/* 开始监测网络状态 */
  startMonitorNetworkStatus() {
    this.timer = setInterval(() => { this.networkState = parseInt(JSON.parse(localStorage.getItem("NetWorkState"))[0]); let el: Element = document.getElementById("networkstate"); if (this.networkState == 1) { el.setAttribute("class","breathe-yellow-btn"); } else if (this.networkState == 3) { el.setAttribute("class","breathe-red-btn"); } else if (this.networkState > 3) { this.display_error = true; let ns: string[] = JSON.parse(localStorage.getItem("NetWorkState")); ns[0] = "3"; localStorage.setItem("NetWorkState",JSON.stringify(ns)); } },1000); } /* 刷新状态 */ refreshStatus() { this.getAnswerStatus(); this.getMonitorStatus(); } /* 清除缓存 */ clearLocalStorage() { localStorage.clear(); } /* 获得题目提交状态 */ getAnswerStatus() { console.log("Start-getAnswerStatus-------"); for (var i = 0; i < parseInt(localStorage.getItem("userOperationAmount")); i++) { let answerLog: string = localStorage.getItem(localStorage.getItem("userId") + i); let answerStatus = answerLog.substring(answerLog.length - 1); let answer: Answer = JSON.parse(answerLog.substring(0,answerLog.length - 1)); if (answerStatus == "0") { let el = document.getElementById("network" + answer.questionMainId); if (el != null) { el.setAttribute("class","badge badge-success badge_postion"); el.innerHTML = "成功提交"; } } if (answerStatus == "1") { let el = document.getElementById("network" + answer.questionMainId); if (el != null) { el.setAttribute("class","badge badge-warning badge_postion"); el.innerHTML = "客户端故障"; } } if (answerStatus == "2") { let el = document.getElementById("network" + answer.questionMainId); if (el != null) { el.setAttribute("class","badge badge-important badge_postion"); el.innerHTML = "服务器故障"; } } } } /* 获得检测状态 */ getMonitorStatus() { console.log("Start-getMonitorStatus-------"); let idList: string[] = JSON.parse(localStorage.getItem("NetWorkState")); for (var i = 1; i < idList.length; i++) { let el = document.getElementById("monitor" + idList[i]); if (el != null) { el.setAttribute("class","btn btn-danger btn-xs pull-right"); el.innerHTML = "监测已停止"; } } } /* 获得操作记录数量 */ getUserOperationAmount() { let amount: number = 1; while (localStorage.getItem("userId" + amount)!=null) { amount++; } localStorage.setItem("userOperationAmount",(amount-1).toString()); } /* 切换监测状态 */ changeMonitorStatus(monitorId: string) { console.log("Start-changeMonitorStatus-------"); let exitFlag: boolean = true; let questionId = monitorId.substring(7,monitorId.length); let idList: string[] = JSON.parse(localStorage.getItem("NetWorkState")); for (var i = 0; i < idList.length; i++) { if (questionId == idList[i]) { //切换为开始 let el = document.getElementById("monitor" + idList[i]); if (el != null) { el.setAttribute("class","btn btn-primary btn-xs pull-right"); el.innerHTML = "正在监测中"; } idList.splice(i,1); localStorage.setItem("NetWorkState",JSON.stringify(idList)); exitFlag = false; } } //切换为停止 if (exitFlag) { let el = document.getElementById(monitorId); if (el != null) { el.setAttribute("class","btn btn-danger btn-xs pull-right"); el.innerHTML = "监测已停止"; } idList.push(questionId); localStorage.setItem("NetWorkState",JSON.stringify(idList)); } } private backupPatternStatus: boolean = false; //备份模式状态 /* 切换备份模式 */ changeBackupPattern() { if (this.backupPatternStatus) { //切换为不备份 let el = document.getElementById("networkbackuppattern"); if (el != null) { el.setAttribute("class","btn btn-info pull-left"); el.innerHTML = "非备份模式"; localStorage.setItem("NetWorkBackupPattern","0"); this.backupPatternStatus = false; } } else { //切换为开始备份 let el = document.getElementById("networkbackuppattern"); if (el != null) { el.setAttribute("class","btn btn-warning pull-left"); el.innerHTML = "备份模式中"; localStorage.setItem("NetWorkBackupPattern","1"); this.backupPatternStatus = true; } } } /* --------------------------------------------------------- */ private openNum: number = 0;//点击三次可以打开 /* 打开模态框 */ openModal(modal: HTMLElement) { this.openNum++; if (this.openNum > 2) { this.refreshStatus(); modal.style.visibility = 'visible'; this.openNum = 0; } } /* 关闭模态框 */ close(modal: HTMLElement) { modal.style.visibility = 'hidden'; } /* 拖动模态框 */ draggable() { $('.modal-dialog').draggable(); }

本地备份下载 ts

/* 创建备份文本并下载 */
  createBackupText() {
    let userLog: string = "";
    for (var i = 0; i < parseInt(localStorage.getItem("userOperationAmount")); i++){
      userLog = userLog +localStorage.getItem(localStorage.getItem("userId")+i);
    }
    let data = new Blob([userLog],{ type: 'application/json' })
    var link = document.createElement("a");
    link.setAttribute("href",window.URL.createObjectURL(data));
    link.setAttribute("download",localStorage.getItem("userId") + '.json');
    link.style.visibility = 'hidden';
    document.body.appendChild(link);
    link.click();
    document.body.removeChild(link);
    console.log("------ Start Create File And Download --------");
}

小结

要针对不同的业务场景采取不同的解决方案,尽可能考虑全面

原文链接:https://www.f2er.com/angularjs/145403.html

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