JEE Mains Marks calculator

jee-main-answers-parser.user.js

// ==UserScript==
// @name         JEE Mains Answers capture 
// @match        https://test.cbexams.com/*
// @description  This script detects parses your entered answers into a computer readable format
// ==/UserScript==


const returnData = [] // stores all the answers

const cb = document.createElement('input')
cb.id = 'cb'
cb.type = 'text'
cb.style.display = 'hidden'
document.body.appendChild(cb)

const copyToClip = () => {
    var cb = document.getElementById("cb");
    cb.value = JSON.stringify(returnData);
    cb.style.display = 'block';
    cb.select();
    document.execCommand('copy');
    cb.style.display = 'none';
    alert('Copied content to clipboard')
}

/**
   * @param {string} content the content
*/
function getSectionsData(content) {
    const subjectRegex = /(?<=Name:).+(?=-)/;
    const idRegex = /(?<=Question\sID:)\d{6}/;
    const sectionRegex = /(?<=Section\s)./;

    const id = content.match(idRegex).pop()
    const subject = content.match(subjectRegex).pop();
    const section = content.match(sectionRegex).pop();

    return { id, subject, section };
}

/**
   * @param {Element} answerData the content
   * @param {string} section
*/
function getGivenAnswer(answerData, section) {
    switch (section) {
        case 'A':
            return answerData.querySelector('font').textContent;
        case 'B':
            return answerData.querySelector('font').textContent;
    }
}

const main = () => {
    const questions = document.querySelectorAll('table[cellspacing="3"]');

    const copyButton = document.createElement("button");
    copyButton.innerText = 'Copy data to clipboard...'
    copyButton.onclick = copyToClip;

    document.body.prepend(copyButton);

    for (const question of questions) {
        let appendData = { id: null, subject: null, section: null, givenAnswer: null }
        const questionData = question.querySelector('tbody > tr:first-child');
        const content = questionData.textContent
        appendData = { ...appendData, ...getSectionsData(content) };

        const answerData = question.querySelector('tbody > tr:last-child');
        // console.log(answerData)
        appendData.givenAnswer = getGivenAnswer(answerData, appendData.section);
        returnData.push(appendData);
        // break;
    }

    return returnData
}

console.log(main())

jee-mains-marks-calculator.user.js

// ==UserScript==
// @name         JEE Mains Marks after capturing the answers 
// @match        https://examinationservices.nic.in/*/KeyChallange/AnswerKey.aspx
// @description  This script calculates the marks after you give the captured answers.
// ==/UserScript==

function parseAnswerKey() {
    let table = document.querySelector('#ctl00_LoginContent_grAnswerKey.table.table-bordered.table-condensed tbody')
    const content = table = table.querySelectorAll('tr:not(tr:nth-child(1))')
    correct_answers = {}
    for (let row of content) {
        let question_id = row.querySelector('span[id$=QuestionNo]').textContent
        let answer = row.querySelector('span[id$=Answer]').textContent
        correct_answers[question_id] = answer
    }
    return correct_answers;
}

/**
 * @param {{id: string; subject: "Chemistry" | "Physics" | "Maths"; section: "A" | "B"; givenAnswer: string}[]}  givenAnswers Description
 */
function calculateMarks(givenAnswers) {
    const correctAnswers = parseAnswerKey();
    let total = 0;
    for (const givenAnswer of givenAnswers) {
        if (!givenAnswer.givenAnswer.includes("Not Attempted")) {
            if (correctAnswers[givenAnswer.id] === givenAnswer.givenAnswer) total += 4;
            else total--;
        }
    }
    alert(`The total marks are ${total}`)
}

const main = () => {

    const mapForm = document.createElement("form");

    const mapInput = document.createElement("input");
    mapInput.type = "text";
    mapInput.name = "answers";
    mapInput.placeholder = 'Paste captured answers';

    const submitBtn = document.createElement("button");
    submitBtn.type = 'submit'
    submitBtn.innerText = "Get marks"

    mapForm.appendChild(mapInput);
    mapForm.appendChild(submitBtn);
    document.body.prepend(mapForm);

    mapForm.onsubmit = e => {
        e.preventDefault();
        try {
            calculateMarks(JSON.parse(mapInput.value));
        } catch (e) {
            alert(e)
        }
    }
}

main()