How to implement the recording and playback function of the answering process in online answering

How to realize the recording and playback function of the answering process in online answering questions

With the development of technology, online education and online learning have become a mainstream way of learning . In the online education process, the question-answering session is a very important part. In order to better understand students' learning situation and analyze students' answering process, we need to implement the recording and playback function of the answering process in online answering.

The key to realizing the recording and playback function of the answering process in online answering is to be able to record the student's answering situation and save it for later playback. An implementation method will be introduced below and specific code examples will be given.

First of all, we need to add a function module for answering questions to the answering system. When a student clicks the answer button to start answering, the answer recording module begins to record the student's answering process. We can use JavaScript to write a function of the answer recorder, as shown below:

function startRecording() {
  // 开始记录答题过程
  var recordData = [];
  var startTime = new Date();

  // 监听题目答案的选择
  document.querySelectorAll('.answer-option').forEach(function(option) {
    option.addEventListener('click', function() {
      var selectedOption = this.innerText;
      var currentTime = new Date() - startTime;
      var answerRecord = {
        time: currentTime,
        answer: selectedOption
      };
      
      recordData.push(answerRecord);
    });
  });

  // 将答题记录存储到localStorage中
  localStorage.setItem('answerRecord', JSON.stringify(recordData));
}

In the above code, we first define an array recordData to save the answer record. Then use the addEventListener function to monitor the answers selected by the students, and save the answer time and selected answer to recordData each time the answer is selected. Finally, save recordData to the local through localStorage.

Next, we need to implement the playback function of the answering process. When students need to replay the answer process, we read the previously saved answer records and display each answer option in sequence at a certain time interval. The following is an example of a simple playback function:

function playback() {
  var recordData = JSON.parse(localStorage.getItem('answerRecord'));
  var playSpeed = 1000; // 回放速度，单位为毫秒

  recordData.forEach(function(answerRecord) {
    setTimeout(function() {
      // 显示答题选项
      document.querySelector('.answer-option').forEach(function(option) {
        if (option.innerText === answerRecord.answer) {
          option.classList.add('selected');
        }
      });
    }, answerRecord.time * playSpeed);
  });
}

In the above code, we first read the previously saved answer record, and then use the forEach method to display each answer option in turn, and Set a time interval to display options one by one. By using the setTimeout function, we can display each answer option after a specified time.

Through the above code examples, we can realize the recording and playback function of the answering process in online answering. Students can record the answering process and play it back later to better understand their answering situation and conduct learning analysis. This is of great significance to improving students' learning effects and teachers' teaching quality. Hope this article can be helpful to you.

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