How to use jQuery to determine the correctness of answers

jQuery is a JavaScript library that is widely used in web development. It has convenient selectors and quick operation methods, allowing developers to complete web development tasks more efficiently. In web development, it is often necessary for users to select answers to questions and then judge whether the user's answers are right or wrong. This article introduces how to use jQuery to judge the correctness of the answers.

Step 1: Create HTML file

First, create an HTML file in the required folder, name it index.html, and add a reference to the jQuery library at the head of the file, as follows Display:

nbsp;html>


    <meta>
    <title>jQueryHow to use jQuery to determine the correctness of answers</title>
    <script></script>


    <h1>请回答以下问题：</h1>
    <p>1. 世界上最高的山峰是哪座？</p>
    <input>A. 珠穆朗玛峰<br>
    <input>B. 布达拉宫<br>
    <input>C. 长城<br>
    <br>
    <p>2. 水的化学式是什么？</p>
    <input>A. H2O<br>
    <input>B. CO2<br>
    <input>C. O2<br>
    <br>
    <button>提交</button>
    <br>
    <br>
    <p></p>
    <script></script>

This file contains two questions and three options, each option value is the letter A, B, C. Add a submit button and an empty text paragraph at the bottom of the page to provide feedback to the user on the correctness of the answer.

Step 2: Create a JavaScript file

Secondly, create a JavaScript file in the required folder and name it index.js. This file contains the main code for jQuery to determine the correctness of the answer.

$(document).ready(function(){
    $("#submit").click(function(){
        var q1=$("input[name='question1']:checked").val();
        var q2=$("input[name='question2']:checked").val();
        var result="";
        if(q1=="A"){
            result+="问题一回答正确；";
        }
        else{
            result+="问题一回答错误；";
        }
        if(q2=="A"){
            result+="问题二回答正确；";
        }
        else{
            result+="问题二回答错误；";
        }
        $("#result").text(result);
    });
});

The file first uses the $(document).ready() method to ensure that the subsequent code can only be executed after the page is loaded.

Next, use the $("#submit").click() method to set the click event for the submit button. When the user clicks the submit button, the option values ​​of question 1 and question 2 will be obtained.

After that, use the if-else statement to determine whether the answer selected by the user is correct. If the option value is the letter A, the answer is determined to be correct, otherwise the answer is determined to be incorrect.

Finally, use the $("#result").text(result) method to display the judgment result in an empty text paragraph.

Step 3: Run the code

Run the index.html file to judge whether the answer to the question is right or wrong, and display the judgment result in an empty text paragraph, as shown below:

Summary:

This article introduces how to use jQuery to judge the correctness of the answer. By creating HTML files and JavaScript files, and using selectors and judgment statements, the user's selection and judgment process of question answers is realized, providing a convenient and fast implementation method for web developers.

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