I need to change javascript code of jCarousel, and I want to create my own function and change it in hook_js_alter(), but it is not working properly, or I missing something.

function common_js_alter(&$javascript) {
  if ($node = menu_get_object()) {
    if ($node->type == 'home') {
      if (array_key_exists('sites/all/libraries/jquery.jcarousel/lib/jquery.jcarousel.js', $javascript)) {
        $file = drupal_get_path('module', 'common') . '/js/jcarousel.js';
        $javascript['sites/all/libraries/jquery.jcarousel/lib/jquery.jcarousel.js'] = drupal_js_defaults($file);

I need to change sites/all/libraries/jquery.jcarousel/lib/jquery.jcarousel.js to drupal_get_path('module', 'common') . '/js/jcarousel.js'. The path is correct, but as I can see with dpm() no scope is enabled and type.

  • You should just change $javascript['sites/all/libraries/jquery.jcarousel/lib/jquery.jcarousel.js']['data'], not all the other values. – kiamlaluno Nov 22 '12 at 16:09
  • i tried, but its not working, and i got an error Undefined index: scope in drupal_get_js() – Petro Popelyshko Nov 22 '12 at 16:11
  • 1
    Then something else is wrong, but not in that code. drupal_js_defaults() surely sets 'scope'. – kiamlaluno Nov 22 '12 at 16:15

Just got into this function too to alter "folder/js_file.js" and the issue causing the

Notice: Undefined index: scope in drupal_get_js() (line 4309 of [DRUPAL_DIR]\includes\common.inc).

error is that there are times when the hook is called but "folder/js_file.js" is not yet in the array w/c just adds

[folder/js_file.js] => Array(
  [data] => [your_custom_js],

to the array but the scope, type, and other attributes are not there. So we first need to check if the array key exists like so:

if (isset($javascript['folder/js_file.js'])) {
  $file = drupal_get_path('module', 'mymodule') . '/your_custom_js.js';
  $javascript['folder/js_file.js']['data'] = $file;

That solves it. :)

  • Nope, this doesn't work at all. – aaronbauman Mar 26 '15 at 15:55
  • While using drupal_js_defaults() as sugested in comments to question gives me bunch of other errors, this works great. – tdd Sep 4 '15 at 12:32

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