Sanfoundry MCQ Scraper

Extracts MCQs from a Sanfoundry webpage and saves them to an HTML file in a quiz format.
当前为 2023-05-19 提交的版本，查看最新版本。
换行
// ==UserScript==
// @name         Sanfoundry MCQ Scraper
// @namespace    themrsami
// @version      1
// @description  Extracts MCQs from a Sanfoundry webpage and saves them to an HTML file in a quiz format.
// @match        *://*/*
// @grant        none
// @license      MIT
// @author       themrsami
// ==/UserScript==

(function() {
    'use strict';

    // Only run the script on Sanfoundry webpages containing MCQs
    if (window.location.href.includes("sanfoundry.com") && document.querySelector(".entry-content p")) {
        function download(filename, text) {
            var element = document.createElement('a');
            element.setAttribute('href', 'data:text/html;charset=utf-8,' + encodeURIComponent(text));
            element.setAttribute('download', filename);
            element.style.display = 'none';
            document.body.appendChild(element);
            element.click();
            document.body.removeChild(element);
        }

        // Add a big green button on top right side of page to extract only when user click on that button
        let extractButton = document.createElement('button');
        extractButton.innerHTML = 'Extract MCQs';
        extractButton.style.position = 'fixed';
        extractButton.style.top = '20px';
        extractButton.style.right = '20px';
        extractButton.style.backgroundColor = 'green';
        extractButton.style.color = 'white';
        extractButton.style.padding = '10px 20px';
        extractButton.style.borderRadius = '5px';
        extractButton.style.border = 'none';
        extractButton.style.cursor = 'pointer';
        document.body.appendChild(extractButton);

        extractButton.onclick = function() {
            let result = `<!DOCTYPE html>
            <html>
            <head>
                <title>MCQs</title>
                <style>
                    body {
                        font-family: Arial, sans-serif;
                        margin: 0 auto;
                        max-width: 800px;
                        padding: 20px;
                        background-color: #f0f0f0;
                    }
                    .mcq-statement {
                        font-size: 1.2em;
                        font-weight: bold;
                        margin-top: 1em;
                        background-color: #f4f4f4;
                        padding: 10px;
                        border-radius: 5px;
                    }
                    .mcq-option {
                        transition: all 0.2s ease-in-out;
                    }
                    .mcq-option:hover {
                        background-color: #f4f4f4;
                        padding-left: 10px;
                    }
                    .mcq-option-correct {
                        font-weight: bold;
                        color: green;
                    }
                    .mcq-option-incorrect {
                        color: red;
                    }
                    .mcq-answer {
                        font-size: 1.1em;
                        font-weight: bold;
                        margin-top: 0.5em;
                        color: green;
                    }
                    .mcq-explanation {
                        margin-top: 0.5em;
                        background-color: #f4f4f4;
                        padding: 10px;
                        border-radius: 5px;
                    }
                </style>
            </head>
            <body>`;
            const mcqElements = document.querySelectorAll(".entry-content p");
            let mcqIndex = 0; // Add an index to keep track of MCQs
            let mcqNumber = 1; // Add a variable to keep track of MCQ numbering
            mcqElements.forEach(mcqElement => {
                const mcqText = mcqElement.textContent.replace("View Answer", "");
                if (mcqText.includes("\n") && /^\d+\./.test(mcqText)) { // Only scrape MCQs that have numbering
                    const mcqStatement = mcqText.split("\n")[0];

                    // Remove the original numbering and add the correct numbering
                    result += `<p class="mcq-statement">${mcqNumber}. ${mcqStatement.replace(/^\d+\./, "")}</p>`;

                    const options = mcqText.split("\n").slice(1);
                    const answerElement = mcqElement.nextElementSibling;
                    const answerText = answerElement.textContent.replace("Answer:", "").replace("Explanation:", "");
                    const answerLetter = answerText.trim().split("\n")[0].trim();

                    // Add buttons to click options of each MCQ
                    options.forEach(option => {
                        if (option.startsWith(answerLetter)) {
                            result += `<button class="mcq-option" onclick="this.style.color='green'">${option}</button>`;
                        } else {
                            result += `<button class="mcq-option" onclick="this.style.color='red'">${option}</button>`;
                        }
                    });

                    // Add a button to view the answer and explanation
                    result += `<button onclick="var answerElement = document.getElementById('answer-${mcqIndex}'); var explanationElement = document.getElementById('explanation-${mcqIndex}'); if (answerElement.style.display === 'none') { answerElement.style.display='block'; explanationElement.style.display='block'; } else { answerElement.style.display='none'; explanationElement.style.display='none'; }">View Answer and Explanation</button>`;

                    result += `<p class="mcq-answer" id="answer-${mcqIndex}" style="display:none">Answer:${answerLetter}</p>`;

                    const explanation = answerText.split("\n").slice(1).join("<br>");

                    // Hide the explanation initially
                    result += `<p class="mcq-explanation" id="explanation-${mcqIndex}" style="display:none">${explanation}</p>`;

                    mcqIndex++; // Increment the index for the next MCQ
                    mcqNumber++; // Increment the MCQ numbering for the next MCQ
                }
            });

            // Add a reset button on top right side of page
            result += `<button style="position:absolute;top:20px;right:20px" onclick="location.reload()">Reset</button>`;

            result += "</body></html>";
            download("mcqs.html", result);
        };
    }
})();
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