content.js

var normalize = function(string){
    return string.replace( /[^-A-Za-z0-9]+/g, '-' ).toLowerCase();
};

var checkVersion = function(){

    var xmlHttp = new XMLHttpRequest();
    xmlHttp.open( "GET", "https://api.github.com/repos/SantiMA10/CampusVirtualPlus/tags", false ); // false for synchronous request
    xmlHttp.send( null );

    var latest = JSON.parse(xmlHttp.response)[0].name;

    var current = chrome.runtime.getManifest().version;

    if(latest != current){
        var div = document.createElement("div");
        div.style.width = "100%";
        div.style.background = "white";
        div.style.textAlign = "center";
        div.textContent = "Nueva actualización disponible";

        var a = document.createElement("a");
        a.href = "https://github.com/SantiMA10/CampusVirtualPlus";
        a.textContent = " ¡descargala!";

        div.appendChild(a);

        document.body.insertBefore(div, document.body.firstChild);
    }

};

var hide = function(elements){

    checkVersion();

    var courses = document.getElementsByClassName("coursebox clearfix");
    var my = document.getElementsByClassName("box coursebox");
    var encuesta = document.getElementsByClassName("box generalbox");
    var popup = document.getElementsByClassName("yui3-button");

    if(courses){
        for(var i = 0; i < courses.length; i++){
            if(elements.indexOf(normalize(courses[i].childNodes[0].childNodes[0].childNodes[0].innerHTML)) != -1){
                courses[i].style["display"] = "none";
            }
        }
    }

    if(my){
        for(var i = 0; i < my.length; i++){
            if(elements.indexOf(normalize(my[i].childNodes[0].childNodes[0].childNodes[0].innerHTML)) != -1){
                my[i].style["display"] = "none";
            }
        }
    }

    if(encuesta){
        for(var i = 0; i < encuesta.length; i++){
            encuesta[i].style["display"] = "none";
        }
    }

    if(popup){
        for(var i = 0; i < popup.length; i++){
            popup[i].click();
        }
    }





};

chrome.storage.sync.get("hide", function (item) {
    if(item.hide){
        hide(item.hide);
    }
});