Question

I have this in my background.js:

var write = function (line) {
  if (localStorage["silent"] == true) {
    chrome.extension.getBackgroundPage().console.log(line);
  } else {
    alert(line);
  }
}
var getFromStorage = function (item, default) {
  if (localStorage[item] == undefined) {
    write("Could not find " + item + " in local storage...");
    return default;
  } else {
    return localStorage[item];
  }
}

var isOn = getFromStorage("isOn", true);
var silent = getFromStorage("silent", false);

And this in my popup.js:

var bgPage = chrome.extension.getBackgroundPage();
var isOn = bgPage.getFromStorage("isOn", true);
var silent = bgPage.getFromStorage("silent", false);

And I get this error:

Object [object Window] has no method 'getFromStorage'

Help is greatly appreciated, thanks 🙂

Answer 1

You should change the default parameter in your background script

  var write = function (line) {
    if (localStorage["silent"] == true) {
      chrome.extension.getBackgroundPage().console.log(line);
    } else {
      alert(line);
    }
  }
  var getFromStorage = function (item, d) {
    if (localStorage[item] == undefined) {
      write("Could not find " + item + " in local storage...");
      return d;
    } else {
      return localStorage[item];
    }
  }

  var isOn = getFromStorage("isOn", true);
  var silent = getFromStorage("silent", false);

Because default is reserved in javascript. (It is used in conjunction with the Switch statement)
Therefore the background page wouldn’t load at all and Inspecting it should result in something like this Uncaught SyntaxError: Unexpected token default at background.js:8

Which then leads to the error Object [object Window] has no method 'getFromStorage'
in your popup script, because getFromStorage actually never has been loaded in your background script because of terminating at Line 8