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isares / Auto RegisterKU

// ==UserScript==
// @name         Auto RegisterKU
// @namespace    https://openuserjs.org/users/isares
// @version      0.1
// @description  Let Steal!
// @author       Isares
// @license MIT
// @copyright 2018, isares (https://openuserjs.org/users/isares)
// -----URL-----
// @match        https://std.regis.ku.ac.th/_Student_Registration.php
// @match        https://std.regis.ku.ac.th/inst_regis.php
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    //setting variable
    var courseID = "01XXXXXX";
    var lectureSec = "";
    var labSec = "";

    //start
    var file = document.location.pathname;
    if (file == "/_Student_Registration.php"){
        //search course
        document.getElementsByName("Cs_Code")[0].value = courseID;
        document.getElementsByName("submit")[0].click();
    } else if (file == "/inst_regis.php"){
        if (document.getElementsByName("Lc_Section")[0] || document.getElementsByName("Lb_Section")[0]){
            if (document.getElementsByName("Lc_Section")[0].value != 0){
                var lcDropdown = document.getElementsByName("Lc_Section")[0];
                if (lectureSec != ""){
                    setSelectedValue(lcDropdown, lectureSec);
                } else{
                    alert("Please fill lecture section");
                }
            } if (document.getElementsByName("Lb_Section")[0].value != 0){
                var lbDropdown = document.getElementsByName("Lb_Section")[0];
                if (labSec != ""){
                    setSelectedValue(lbDropdown, labSec);
                } else{
                    alert("Please fill lecture section");
                }
            }
            document.getElementsByName("go")[0].click();
        } else if (document.documentElement.innerHTML.search("บันทึกรายวิชาเรียบร้อยแล้ว") != -1){
            //end
            alert('Congratulation!');
        } else{
            //loop
            window.location.href = "https://std.regis.ku.ac.th/_Student_Registration.php";
        }
    }

    //function
    function setSelectedValue(selectObj, valueToSet) {
        for (var i = 0; i < selectObj.options.length; i++) {
            if (selectObj.options[i].value == valueToSet) {
                selectObj.options[i].selected = true;
                return;
            }
        }
    }
})();