Autofill course questionnaires
// ==UserScript==
// @name NYCU Course Questionnaires
// @namespace https://github.com/FractaIism/TamperMonkey-UserScripts
// @version 1.2.2
// @description Autofill course questionnaires
// @author Fractalism
// @match http*://course.nycu.edu.tw/TeachPoll/question.asp
// @grant none
// ==/UserScript==
(function () {
'use strict';
var randomize = false; // generate random answers for each question
// parameter set 1 (used when randomize == false)
var part1_ans = 3; // default answer for part 1 of questionnaire, values: 1~5 from left to right
var part2_ans = 2; // default answer for part 2 of questionnaire, values: 1~X from left to right (default to 1 if option not available)
var default_ans = 2; // if there are more than two parts
// parameter set 2 (used when randomize == true)
const ans_prob = Object.freeze({
1: 10,
2: 30,
3: 50,
4: 5,
5: 1,
}); //relative probability of each answer appearing if randomize is set (will be normalized so the sum of probabilities is 1). If a choice is not present, it will be ignored and normalization will be carried out with only the remaining choices.
// function to fill out questionnaire
function main() {
let parts = document.querySelectorAll('table.stripeMe');
Array.from(parts).forEach((part, part_index) => {
let rows = part.getElementsByTagName('tr');
Array.from(rows).forEach((row, row_index) => {
let buttons = row.querySelectorAll('input[type=radio]');
if (buttons.length == 0) return;
let ans = getAns(part_index, buttons.length);
if (buttons[ans - 1]) { // if selected score exists
//console.log(row_index + " case 1: normal")
buttons[ans - 1].checked = true;
} else if (ans > buttons.length - 1) {
//console.log(row_index + " case 2: overflow")
buttons[buttons.length - 1].checked = true;
} else if (ans < 0) {
//console.log(row_index + " case 3: underflow")
buttons[0].checked = true;
} else {
//console.log(row_index + " case 4: unexpected score, use default")
//console.log(buttons.length)
buttons[Math.floor(buttons.length / 2 - 1)].checked = true;
}
})
});
// check all checkboxes
Array.from(document.querySelectorAll('input[type=checkbox]')).forEach((item) => item.checked = true);
};
main();
// manually solve captcha
window.scrollTo(0, document.body.scrollHeight);
document.querySelector('input[name=qCode]').focus();
(function makeMenu() {
// a place for buttons (additional functionality)
var menu = document.createElement('div');
menu.style.position = 'absolute';
menu.style.top = '15px';
menu.style.right = '40px';
document.body.appendChild(menu);
// add score select
var scoreSelect = document.createElement('select');
scoreSelect.id = 'scoreSelect';
scoreSelect.style.margin = '7px 7px 7px 7px';
for (let i = 1; i <= 7; ++i) {
let optionNode = document.createElement('option');
scoreSelect.appendChild(optionNode);
}
scoreSelect.firstChild.textContent = '== 選擇評分 ==';
let scoreText = ['', '非常滿意', '滿意', '普通', '不滿意', '非常不滿意']
for (let i = 1; i <= 5; ++i) {
scoreSelect.children[i].value = i;
scoreSelect.children[i].textContent = scoreText[i];
}
scoreSelect.lastChild.value = '-1';
scoreSelect.lastChild.textContent = '隨機';
menu.appendChild(scoreSelect);
// add refill button
var refillBtn = document.createElement('button');
refillBtn.style.margin = '7px 7px 7px 7px';
refillBtn.innerText = '自動填答';
refillBtn.addEventListener('click', main);
menu.appendChild(refillBtn);
// add reload button
var reloadBtn = document.createElement('button');
reloadBtn.style.margin = '7px 7px 7px 7px';
reloadBtn.innerText = '重新整理';
reloadBtn.addEventListener('click', location.reload.bind(window.location));
menu.appendChild(reloadBtn);
})();
// opt_len: number of options
function getAns(part_index, opt_len) {
// use user-selected score if available
var selScore = document.getElementById('scoreSelect')?.value;
if (!isNaN(selScore)) {
if (selScore == -1) { // random answers
randomize = true;
// fall through to get a random answer
} else {
return selScore;
}
}
// on page load, use script config
if (randomize) {
let prob = Object.assign({}, ans_prob); // make a copy
for (let i = opt_len + 1; i <= 5; ++i) {
prob[i] = 0; // for nonexistent options, probability = 0
}
let cmf = normalize(prob);
let rnd = Math.random(); // random float in [0,1)
let choice;
for (let i = 1; i <= 5; ++i) {
if (rnd < cmf[i]) {
choice = i;
break;
}
}
return choice;
} else {
if (part_index == 0) return part1_ans;
else if (part_index == 1) return part2_ans;
else return default_ans;
}
}
// get non-normalized pmf and return normalized cmf
// pmf: probability mass function
// cmf: cumulative mass function
function normalize(massfunc) {
// calculate the sum of numbers in pmf to normalize it
let pmf = Object.assign({}, massfunc); // javascript uses call by sharing for object arguments, so copy object using Object.assign
let sum = 0;
for (let i in pmf) {
sum += pmf[i];
}
// normalize pmf and convert to cmf
let cmf = {};
for (let i = 1; i <= 5; ++i) {
pmf[i] /= sum;
cmf[i] = i == 1 ? pmf[i] : cmf[i - 1] + pmf[i];
}
return cmf;
}
})();