uonetplus-srednia.user.js

// ==UserScript==
// @name         avregae calc
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  avregae calc
// @author       dumbasPL
// @match        *.eszkola.opolskie.pl/*
// @grant        none
// ==/UserScript==
var table = document.getElementsByClassName('ocenyZwykle-table')[0];
if(table){
    let totalIlosc = 0;
    let totalSuma = 0;
    for(var i = 1; i < table.rows.length; i++){
        let suma = 0;
        let ilosc = 0;
        var oceny = table.rows[i].getElementsByClassName('break-word')[0];
        if(oceny){
            var o = oceny.getElementsByTagName('span');
            if(o){
                for(var j = 0; j < o.length; j++){
                    var xx = /[0-9]{1}[+-]{0,1}/g.exec(o[j].innerHTML);
                    if(xx && xx.length == 1){
                        var ocena = parseFloat(eval(xx[0].replace("+", " + 0.33").replace("-", " - 0.33")));
                        var alt = o[j].getAttribute('alt');
                        var vv = /Waga: ([0-9]+,[0-9]+)/g.exec(alt);
                        var waga = parseFloat(vv[1].replace(",", "."));
                        suma += parseFloat(ocena * waga);
                        ilosc += parseFloat(waga);
                    }
                }
            }
        }
        var span = document.createElement("span");
        span.style.color = "#f00";
        let value = Math.round((suma / ilosc)*100)/100;
        span.innerHTML = "Średnia: " + value;
        if(suma) table.rows[i].getElementsByClassName('break-word')[0].appendChild(span);
        if(!isNaN(value)){
            totalIlosc++;
            totalSuma += parseFloat(value);
        }

    }
    let total = document.createElement("span");
    total.style.color = "#f00";
    let totalValue = Math.round((totalSuma / totalIlosc)*100)/100;
    total.innerHTML = "Średnia wszystkiego: " + totalValue;
    table.parentNode.appendChild(total);
}