Script to calculate CPA, GPA on SIS of HUST

student-marks-script.js

/**
 * Script to calculate CPA, GPA on SIS of HUST.
 *
 * Usage:
 * 0. Copy the script below
 * 1. Go to website for Student Marks of HUST:
 *    https://ctt-sis.hust.edu.vn/Students/StudentCourseMarks.aspx
 * 2. Open DevTools by pressing F12 (Right-Click -> Inspect)
 * 3. Choose tab Console then paste the script into it -> Enter
 *
 * Use at your own risk!
 */

(() => {
    console.clear();
    const URL = 'https://ctt-sis.hust.edu.vn/Students/StudentCourseMarks.aspx';
    if (window.location.href !== URL) {
        console.log('Error: Use on Student Marks only!');
        console.log(`--> ${URL}`);
        return false;
    }
    const BASE_MARK_ROW_ID = 'ctl00_ctl00_contentPane_MainPanel_MainContent_gvCourseMarks_DXDataRow';
    const loadMark = (rowIndex) => {
        const markRow = document.getElementById(BASE_MARK_ROW_ID + rowIndex);
        return {
            semester: markRow.childNodes[1].textContent,
            subjectId: markRow.childNodes[2].textContent,
            subjectName: markRow.childNodes[3].textContent,
            credits: markRow.childNodes[4].textContent,
            classId: markRow.childNodes[5].textContent,
            middleMark: markRow.childNodes[6].textContent,
            finalMark: markRow.childNodes[7].textContent,
            rank: markRow.childNodes[8].textContent
        };
    };
    const convertRankToPoint = (rank) => {
        if (rank === 'A+' || rank === 'A') return 4.0;
        if (rank === 'B+') return 3.5;
        if (rank === 'B') return 3.0;
        if (rank === 'C+') return 2.5;
        if (rank === 'C') return 2.0;
        if (rank === 'D+') return 1.5;
        if (rank === 'D') return 1.0;
        return 0.0;
    };
    const calculateGPA = (marks, semester) => {
        let creditPointProduct = 0.0;
        let totalCredits = 0.0;
        for (const mark of marks) {
            if (mark.semester === semester) {
                const point = convertRankToPoint(mark.rank);
                creditPointProduct += point * Number(mark.credits);
                totalCredits += Number(mark.credits);
            }
        }
        return {
            point: creditPointProduct / totalCredits,
            credits: totalCredits
        };
    };
    const calculateCPA = (marks) => {
        let creditPointProduct = 0.0;
        let totalCredits = 0.0;
        for (const mark of marks) {
            const point = convertRankToPoint(mark.rank);
            creditPointProduct += point * Number(mark.credits);
            totalCredits += Number(mark.credits);
        }
        return {
            point: creditPointProduct / totalCredits,
            credits: totalCredits
        };
    };
    const calculateAll = (marks) => {
        const gpas = {};
        for (const mark of marks) {
            if (!gpas[mark.semester]) {
                const result = calculateGPA(marks, mark.semester);
                gpas[mark.semester] = {
                    point: result.point,
                    credits: result.credits
                };
            }
        }
        const cpa = calculateCPA(marks);
        return {
            gpas: gpas,
            cpa: cpa
        };
    };
    (() => {
        const marks = [];
        console.log('Loading...');
        while (true) {
            try {
                const mark = loadMark(marks.length);
                marks.push(mark);
            } catch (error) {
                console.log('Loaded.')
                break;
            }
        }
        const result = calculateAll(marks);
        console.log('---');
        for (const semester of Object.keys(result.gpas)) {
            const gpa = result.gpas[semester];
            console.log(`${semester}:\t${gpa.credits}\t${gpa.point}`);
        }
        console.log('---');
        console.log(`CPA:\t${result.cpa.credits}\t${result.cpa.point}`);
        console.log('--- by Tuanm');
    })();
    return true;
})();

I just found it makes no sense while the website has all information we need. 😆