In my module I have the following code.

$my_settings = array(
    'basePath' => '/',
    'my_locs' => $my_locs // Array of numbers

drupal_add_js(array('my_module' => $my_settings), 'setting');

In the JavaScript I am supposed to retrieve settings as follows.

var my_locs = Drupal.settings.my_module.my_locs;

From Goggle Chrome console, I get the following error.

Uncaught TypeError: Cannot read property 'my_locs' of undefined google_elev.js

These are the various output I obtain from the console.

[41, 9, 42, 9]
>my_locs = 2
>var my_locs
>my_locs = Drupal.settings.my_module.my_locs
[41, 9, 42, 9]
[41, 9, 42, 9]

All the rest in the JavaScript file works perfectly; variables are readed, computed, snd used. Settings are loaded in Drupal.settings before loading the JavaScrip file with drupal_add_js().

I don't know what to try. I don't understand if it is a syntax problem, if I must define the var to be an array before, or if something tricky in the order of callings have to be accomplished.

  • 1
    When you say Drupal.settings are loaded before loading the JS file, do you mean in your declaration (php) file? For the actual page load I believe attached JS is loaded before Drupal.settings, which is what was causing your undefined error. (A common solution for this is to call window.onload.)
    – forest
    Jul 26, 2015 at 21:07

2 Answers 2


Try this

(function($) {
  Drupal.behaviors.myModule_someJS = {

    anotherFunction: function() {

    attach: function(context, settings) {

      this.vars = {
        initial_page  : Drupal.settings.myModule.initial_page



Drupal.settings won’t contain the custom stuff sent through from my module until the attach function is called, so therefore every settings variable can only be called inside attach()

  • Yes, furthermore exploiting the (function($)... construct is the orthodox method for avoiding clashings. Thanks. May 20, 2014 at 19:30
  • Np :) Happy to help :)
    – Hitesh
    May 21, 2014 at 5:27

For future readers who will have the same problem.

My call for retrieving Drupal settings variables was made in the declaration part of the JavaScript:

var my_locs = Drupal.settings.my_module.my_locs;

I supposed this would be correct, since the Drupal settings object is already created, and since Javascript allows, like Java, the creation of new objects at declaration time. But for some reason it didn't work.

I solved leaving the declaration

var my_locs;

and passing the object inside an initialize() method.

function initialize() {
    my_locs = Drupal.settings.my_module.my_locs;

I hope it can be useful, since I lost lot of time on this.

  • what is initialize() method??
    – Hitesh
    May 20, 2014 at 13:36
  • It is a whatever method you can exploit to instantiate variables. What you can't do is to initialize them in the declaration block. May 20, 2014 at 14:10

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