cms:onDisplayPageForm event
The cms:onDisplayPageForm event function allows to load extra CSS or JavaScript files on the Create/Edit Product page. The event handler should accept a single parameter - the controller object reference. Call addJavaScript() and addCss() methods of the controller object to add references to JavaScript and CSS files. Use paths relative to LemonStand installation URL for your resource files.
Event handler example:
public function subscribeEvents()
{
Backend::$events->addEvent('cms:onDisplayPageForm', $this, 'load_page_resources');
}
public function load_page_resources($controller)
{
$controller->addJavaScript('/modules/mymodule/resources/javascript/my.js');
$controller->addCss('/modules/mymodule/resources/css/my.css');
}Next: core:onUninitialize event
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