Adding a javascript to all pages in OpenCart

save your script to a file, say 'catalog/view/javascript/myscript.js'

Then add

$this->document->addScript('catalog/view/javascript/myscript.js');

to the catalog/controller/common/header.php some place before this line:

$this->data['scripts'] = $this->document->getScripts();

You could also just place your script inline into catalog/view/theme/{theme name}/template/common/header.tpl using normal html markup.

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