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How to set a time limit for answering questions online

WBOYOriginal: 2023-09-26 08:55:421364browse

How to set a time limit for answering questions in online answering

With the popularization and development of the Internet, more and more educational institutions and enterprises have begun to use online answering methods. Knowledge testing and selection. When answering questions online, in order to ensure fairness and standardization, it is often necessary to set a time limit for answering questions. This article will introduce how to set a time limit for answering questions online, including specific code examples.

In web development, technologies such as HTML, CSS and JavaScript can be used to implement the time-limited function of answering questions. The specific steps are as follows:

Create an answer page
First, create an answer page, including answer questions, options, submit buttons and other elements. You can use HTML language to write the page structure, as shown below:

<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8">
  <title>在线答题</title>
</head>
<body>
  <h1>答题题目</h1>
  <form id="answerForm">
    <input type="radio" name="option" value="option1">选项1<br>
    <input type="radio" name="option" value="option2">选项2<br>
    <input type="radio" name="option" value="option3">选项3<br>
    <input type="radio" name="option" value="option4">选项4<br>
  </form>
  <button id="submitBtn">提交</button>
</body>
</html>

Add the time-limited answer function
Use JavaScript language to implement the time-limited answer function. You can implement a countdown by setting a timer function and automatically submit the answer when the time is up. The specific code is as follows:

<script>
  // 计时器
  var timer;
  
  // 设置限时，单位为秒
  var timeLimit = 60;
  
  // 页面加载完成后开始计时
  window.onload = function() {
    startTimer();
  }
  
  // 开始计时
  function startTimer() {
    timer = setInterval(function() {
      timeLimit--;
      if (timeLimit == 0) {
        clearInterval(timer);
        submitAnswer();
      }
      updateTimer();
    }, 1000);
  }
  
  // 更新计时器显示
  function updateTimer() {
    document.getElementById("timer").innerHTML = "剩余时间：" + timeLimit + "秒";
  }
  
  // 提交答案
  function submitAnswer() {
    // 获取选中的选项
    var answer = document.querySelector('input[name="option"]:checked').value;
    // 提交答案的相关处理
    // ...
  }
</script>

Display countdown
Add an element to display the countdown on the answer page, as shown below:

<h2 id="timer"></h2>

In In the code, we use the setInterval function to reduce the remaining time every second, and update the countdown display through the innerHTML attribute.

Submit answer
Call the submitAnswer function in the click event of the submit button to obtain the options selected by the user and perform related processing.

Through the above steps, we have successfully implemented the time-limited function of answering questions online. After the user enters the answer page, the countdown timer will start, and the answer will be automatically submitted when the time is up. At the same time, the remaining time of the countdown will also be displayed on the page in real time.

In the actual answering system, more functions can be added according to needs, such as start button, pause button, etc. I hope this article can help you to better set the answering time limit when developing an online answering system. I wish you good results with your online question answering system!

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JavaScript css html 事件 innerHTML

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