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PrestaShop 9 errors

jquery-1.11.0.min.js 404 and "$ is not defined" after upgrading to PrestaShop 9

PrestaShop 9 keeps only jQuery 3.7.1 in js/jquery. Modules and themes that load an older file by its path get a 404, and every script that depends on it stops with "$ is not defined".

The error
GET /js/jquery/jquery-1.11.0.min.js 404 (Not Found)
Removed in
PrestaShop 9.0
Usually found in
Themes, older modules

What happened

PrestaShop used to ship several jQuery versions in js/jquery/, and some modules and themes loaded one of them by its exact file name. PrestaShop 9 keeps only jquery-3.7.1.min.js and jquery-migrate-3.4.0.min.js. Paths to jquery-1.11.0, jquery-3.4.1, jquery-3.5.1, jquery-migrate-1.2.1 or jquery-migrate-3.1.0 now return 404.

The 404 itself is harmless. The trouble starts after it: scripts that expected jQuery fail with $ is not defined or jQuery is not defined, and with them sliders, popups, product option pickers or back office forms.

The helper Media::getJqueryPath(), which some modules used to find the file, was already removed in PrestaShop 8.0.

The fix

Do not load jQuery yourself:

  • Back office: PrestaShop 9 already loads jQuery 3.7.1 on every page. Remove the module's own addJS() of an old file.
  • Front office: jQuery comes with the theme (Classic bundles it in its core JavaScript). Check what your theme provides before adding another copy, and never load a second jQuery on top of it: plugins attached to the first one disappear.
  • Old plugins: code written for jQuery 1.x may use methods removed in 3.x, such as .live(), .size() or .load(fn). The browser console shows which ones. jquery-migrate restores some of them for a while, but the real fix is to update the code.
// Before
$this->context->controller->addJS(_PS_JS_DIR_ . 'jquery/jquery-1.11.0.min.js');
$this->context->controller->addJS(Media::getJqueryPath());

// After: nothing, jQuery is already on the page

Where else it hides

grep -rn "jquery-1\.\|jquery-3\.[45]\|jquery-migrate-\|getJqueryPath" modules/ themes/ override/

Look in the theme's head.tpl and layout templates too: hard-coded <script> tags are common there.

Find every place like this before you upgrade

Where one removed call is, there are usually more. Our free PrestaShop 9 Readiness Check reads the code of every module, the theme and the overrides and lists each problem with its file and line. It only reads, nothing is changed.

Get the free check

Prefer not to fix it yourself? We upgrade stores to PrestaShop 9 for a fixed price. See the upgrade