gradescope-helper.js

// ==UserScript==
// @name         Gradescope Keyboard Shortcuts
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  Keyboard shortcuts to make grading faster.
// @author       Strikeskids
// @match        https://www.gradescope.com/*grade
// @grant        none
// ==/UserScript==

/* Shortcuts
 *
 * [S]croll around
 * [E]rase
 * [D]raw lines
 * [T]ext comment
 * [C]omment box
 * [P]oint box
 */

(function() {
    'use strict';

    let buttons = null;
    let commentBox = null;
    let initialized = false;
    let pointBox = null;

    function setup() {
        try {
            buttons = document.querySelector('.pageViewerControls--row-top').querySelectorAll('.btnGroup')[1].children;
        } catch (e) {
            buttons = null;
        }

        commentBox = document.querySelector('.form--textArea');
        pointBox = document.querySelector('#pointAdjustment');

        initialized = buttons !== null && commentBox !== null && pointBox !== null;

        if (!initialized) console.log('Failed to initialize', buttons, commentBox, pointBox);
    }

    if (document.readyState !== 'loading') setup();
    else document.body.addEventListener('DOMContentLoaded', setup);

    document.body.addEventListener('keydown', (e) => {
        if (document.querySelector('.focus-ring') || !initialized) return;
        switch (e.code) {
            case 'KeyE':
                buttons[4].click();
                break;
            case 'KeyS':
                buttons[0].click();
                break;
            case 'KeyT':
                buttons[1].click();
                break;
            case 'KeyD':
                buttons[2].click();
                break;
            case 'KeyC':
                commentBox.focus();
                break;
            case 'KeyP':
                pointBox.focus();
                break;
            default: return;
        }

        e.preventDefault();
        e.stopPropagation();
    });
})();