popup.js

// Copyright (c) 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

/**
 * Get the current URL.
 *
 * @param {function(string)} callback - called when the URL of the current tab
 *   is found.
 */
function getCurrentTabUrl(callback) {
  // Query filter to be passed to chrome.tabs.query - see
  // https://developer.chrome.com/extensions/tabs#method-query
  var queryInfo = {
    active: true,
    currentWindow: true
  };

  chrome.tabs.query(queryInfo, function(tabs) {
    // chrome.tabs.query invokes the callback with a list of tabs that match the
    // query. When the popup is opened, there is certainly a window and at least
    // one tab, so we can safely assume that |tabs| is a non-empty array.
    // A window can only have one active tab at a time, so the array consists of
    // exactly one tab.
    var tab = tabs[0];

    // A tab is a plain object that provides information about the tab.
    // See https://developer.chrome.com/extensions/tabs#type-Tab
    var url = tab.url;

    // tab.url is only available if the "activeTab" permission is declared.
    // If you want to see the URL of other tabs (e.g. after removing active:true
    // from |queryInfo|), then the "tabs" permission is required to see their
    // "url" properties.
    console.assert(typeof url == 'string', 'tab.url should be a string');

    callback(url);
  });

  // Most methods of the Chrome extension APIs are asynchronous. This means that
  // you CANNOT do something like this:
  //
  // var url;
  // chrome.tabs.query(queryInfo, function(tabs) {
  //   url = tabs[0].url;
  // });
  // alert(url); // Shows "undefined", because chrome.tabs.query is async.
}

/**
 * @param {string} searchTerm - Search term for Google Image search.
 * @param {function(string,number,number)} callback - Called when an image has
 *   been found. The callback gets the URL, width and height of the image.
 * @param {function(string)} errorCallback - Called when the image is not found.
 *   The callback gets a string that describes the failure reason.
 */
function getImageUrl(searchTerm, callback, errorCallback) {
  // Google image search - 100 searches per day.
  // https://developers.google.com/image-search/
  var searchUrl = 'https://ajax.googleapis.com/ajax/services/search/images' +
    '?v=1.0&q=' + encodeURIComponent(searchTerm);
  var x = new XMLHttpRequest();
  x.open('GET', searchUrl);
  // The Google image search API responds with JSON, so let Chrome parse it.
  x.responseType = 'json';
  x.onload = function() {
    // Parse and process the response from Google Image Search.
    var response = x.response;
    if (!response || !response.responseData || !response.responseData.results ||
        response.responseData.results.length === 0) {
      errorCallback('No response from Google Image search!');
      return;
    }
    var firstResult = response.responseData.results[0];
    // Take the thumbnail instead of the full image to get an approximately
    // consistent image size.
    var imageUrl = firstResult.tbUrl;
    var width = parseInt(firstResult.tbWidth);
    var height = parseInt(firstResult.tbHeight);
    console.assert(
        typeof imageUrl == 'string' && !isNaN(width) && !isNaN(height),
        'Unexpected respose from the Google Image Search API!');
    callback(imageUrl, width, height);
  };
  x.onerror = function() {
    errorCallback('Network error.');
  };
  x.send();
}



function saveState() {
  var checkbox = document.querySelector('input[type=checkbox]');
  if(checkbox.value != null) {
      console.log(checkbox.value);
  //localStorage.setItem(checkbox.value, checkbox.checked);
  chrome.storage.local.set({"toggled": checkbox.checked});
  }
}


// window.onload = function load() {
//   if (checkbox.value != null) {
//     checkbox.checked = localStorage.getItem(checkbox.value) === 'true' ? true:false;
//   }
// }

document.addEventListener('DOMContentLoaded', function() {
    
 
  var checkbox = document.querySelector('input[type=checkbox]');
  
  // if (checkbox.value != null) {
  //   console.log(1);
    chrome.storage.local.get('toggled', function(item){checkbox.checked = item.toggled;});
  //    // var t = document.getElementById("toggle");
  //    //  t.disabled = true;
  // } else {
  //   chrome.storage.local.set({"toggled": false});
  // }
  document.getElementById("toggler").innerHTML = "Toggle the button to study in peace!";
  document.querySelector("#toggle").addEventListener('change', changeHandler);
  getCurrentTabUrl(function(url) {
    // Put the image URL in Google search.
    //renderStatus('Performing Google Image search for ' + url);
  });
});

function changeHandler(){
  var checkbox = document.querySelector('input[type=checkbox]');

    //console.log(3);
   //Do Something...maybe another function showAlert(), for instance
   if(toggle.checked){

console.log(checkbox.value);
console.log(checkbox.checked);
      saveState();
      document.getElementById("toggler").innerHTML = "Done with studying? Click below for a quiz ;)";
      var t = document.getElementById("toggle");
      t.disabled = true;
   }
   else{
      saveState();

console.log(checkbox.value);
console.log(checkbox.checked);
      document.getElementById("toggler").innerHTML = "Toggle the button to study in peace!";
   }
}