I've written a custom D7 module as a companion to a theme I've contributed to drupal.org and in the module, I effect output of the logo image with some basic jQuery as such:

$("li.purple").click(function () {
$('#logo-img').attr('src', '/sites/all/themes/mytheme/images/logo-purple.png');

$("li.green").click(function () {
$('#logo-img').attr('src', '/sites/all/themes/mytheme/images/logo-green.png');


Now this works fine but ideally I'd like not to have to hard code the theme path as above, it would be great to have a variable instead.

I did some searching and found a drupal docs page, "Pass the theme path to javascript", but I can't really make heads or tails of it within the context of what I'm trying to do. There's a preprocess function on the aforementioned docs page that supposedly can tell jQuery what the path to the theme is but I don't quiet understand the usage in terms of actually creating a theme path variable. So from this:

function my_module_preprocess_page(&$vars) {
  drupal_add_js('jQuery.extend(Drupal.settings, { "pathToTheme": "' . path_to_theme() . '" });', 'inline');

I need to extract the path variable and put into this:

$("li.green").click(function () {
$('#logo-img').attr('src', pathToTheme + '/images/logo-purple.png');

... However, I get this error:

Uncaught ReferenceError: pathToTheme is not defined 

... so I'm just struggling how to get this to work or if it's even possible.

2 Answers 2


Use Drupal.settings.pathToTheme.

$("li.green").click(function () {
 $('#logo-img').attr('src', Drupal.settings.pathToTheme + '/images/logo-purple.png');

Also, theme_preprocess_page(&$vars) should be in template.php as your_theme_preprocess_page(&$vars);

Good idea to not hard code the theme path, that path structure wouldn't work for all set-ups.

  • Ah, perfect, I ended up doing $('#logo-img').attr('src', '/' + Drupal.settings.pathToTheme + '/images/logo-purple.png'); with the forward slash in front of the path. Thanks! Commented Aug 9, 2013 at 19:47
  • Glad I could help. The / may cause problems on some set-ups as well, I believe (though I can't think of specific cases right now). Just keep in mind that you also have Drupal.settings.basePath Commented Aug 9, 2013 at 19:51
  • So I should probably combine Drupal.settings.basePath with Drupal.settings.pathToTheme so I don't need to hard code the forward slash I am guessing? I'll have to test that out. Thanks. Commented Aug 9, 2013 at 20:33
  • It worked, I did: $('#logo-img').attr('src', Drupal.settings.basePath + Drupal.settings.pathToTheme + '/images/logo.png'); Commented Aug 9, 2013 at 20:38

Personally, I think that building up paths in JS should be avoided. I used to do this, but lately, run into the problem that can result.

When you glue together a path in JS, you bypass the API. In your particular example, it would mean that your image couldn't be server up from a CDN.

I would do something like

function MYTHEME_preprocess_page (&variables) {
  $path = drupal_get_path('theme', 'MYTHEME');

    'MYTHEME' => array(
      'logoSrc' => file_create_url($path . '/images/logo.png'),
  ), 'setting');

in your theme, and then in your JS

$("li.green").click(function () {
  $('#logo-img').attr('src', Drupal.settings.MYTHEME.logoSrc);

Also note that in the Drupal Javascript API, the jQuery context and settings are passed into behaviors, so you can do something like:

(function ($, Drupal, undefined) {
  Drupal.behaviors.MYTHEME = {
    attach: function (context, settings) {
      $("li.green", context).click(function () {
        $('#logo-img', context).attr('src', settings.MYTHEME.logoSrc);

})(jQuery, Drupal);

in your theme Javascript.

  • Interesting, I'm also setting a jQuery cookie when a color is clicked so I'd presume I can possibly do this with one of your examples above. I'll check these out, I'm all for doing things the proper drupal way. Thank you! Commented Aug 10, 2013 at 2:31

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