options.js

// Saves options to chrome.storage
function save_options() {
    var calendarEnabled = document.getElementById('calendar').checked;
    var driveEnabled = document.getElementById('drive').checked;
    var sheetsEnabled = document.getElementById('sheets').checked;
    var docsEnabled = document.getElementById('docs').checked;
    var statusLabel = document.getElementById("status");
    //Save the settings
    chrome.storage.sync.set({
        calendar: calendarEnabled,
        drive: driveEnabled,
        sheets: sheetsEnabled,
        docs: docsEnabled
    }, function () {
        // Notify that we saved.
        statusLabel.style.display = 'block';
        statusLabel.innerHTML = 'Settings successfully saved.';
        statusLabel.className = "alert alert-success";
    });

    chrome.tabs.query({ url: "*://*.google.com/*" }, function (tabs) {
        //The reload function is going to be executed in every single site using the toolbar
        //So it will be reflect the latest changes
        tabs.forEach(function (element) {
            console.log(element.url)
            chrome.tabs.executeScript(element.id, {
                code: 'reload();'
            });
        }, this);
    });
}
// Restores select box and checkbox state using the preferences
// stored in chrome.storage.
function restore_options() {
    chrome.storage.sync.get({
        calendar: true,
        drive: true,
        sheets: true,
        docs: true
    }, function (items) {
        document.getElementById("calendar").checked = items.calendar;
        document.getElementById("drive").checked = items.drive;
        document.getElementById("docs").checked = items.docs;
        document.getElementById("sheets").checked = items.sheets;
    });
    //Get app version from manifest
    var version = chrome.app.getDetails().version;
    //Display app version
    document.getElementById("version").innerHTML = "Version " + version;
}
//Restore setting on DOM load
document.addEventListener('DOMContentLoaded', restore_options);
//Add event to save button click
document.getElementById('save').addEventListener('click', save_options);