SDUGPACalculator.js

// ==UserScript==
// @name         SDU GPA Calculator
// @namespace    https://alexander.dk/
// @version      0.1
// @description
// @author       You
// @match        https://selvbprod.sdu.dk/prod/sb/resultater/studresultater.jsp
// @icon         https://www.google.com/s2/favicons?sz=64&domain=sdu.dk
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    const GPA_CONVERSION_TABLE = {
        'A': 5,
        'B': 4,
        'C': 3,
        'D': 2,
        'E': 1,
        'F': 0
    }

    const resultTable = document.querySelector("#resultTableGrup > tbody");
    const gradeNodes = resultTable.querySelectorAll("tr");

    const grades = [];

    for(const gradeNode of gradeNodes) {
        const gradeText = gradeNode.querySelector("td:nth-child(5)")?.textContent;

        if (isNaN(gradeText)) continue;

        const gradeEcts = gradeNode.querySelector("td:nth-child(6)")?.textContent;
        const weightText = gradeNode.querySelector("td:nth-child(7)")?.textContent;

        const grade = Number(gradeText);
        const weight = Number(weightText);

        grades.push({grade, weight, gradeEcts});
    }

    const accWeights = grades.reduce((acc, next) => acc + next.weight, 0);

    const gpaDK = grades.reduce((acc, next) => acc + (next.grade * next.weight), 0) / accWeights;
    const gpaUS = grades.reduce((acc, next) => acc + (GPA_CONVERSION_TABLE[next.gradeEcts] * next.weight), 0) / accWeights;

    resultTable.insertAdjacentHTML('beforeend', `

    <tr class="DataSelect"></tr>
    <tr class="DataSelect">
    <td colspan="4" class="DataValue"><b>Vægtet gennemsnit (DK):</b></td>
    <td colspan="3" class="DataValue">${gpaDK}</td>
    </tr>
    <tr class="DataSelect">
    <td colspan="4" class="DataValue"><b>Vægtet gennemsnit GPA (US):</b></td>
    <td colspan="3" class="DataValue">${gpaUS}</td>
    </tr>
    `);

})();