Redirect on extension plugin with onExtensionBeforeInstall

Question

i've created an extension plugin and i'am having issue to redirect on the trigger onExtensionBeforeInstall

Here is my code :

class plgExtensionExample extends JPlugin{

    function onExtensionBeforeInstall($method, $type, $manifest, $eid){
        $app = JFactory::getApplication();
        $app->redirect(JRoute::_('index.php'));
        $app->close();
    }
}

When i try to install a plugin a have a javascript error :

In chrome

Uncaught TypeError: Cannot read property 'redirect' of undefined

In firefox

TypeError: res.data is undefined

I've searched in joomla and res is the result of a call in ajax, but res need to be an object and it's a string of html. I've tried to reach the url which is called in ajax but i got this message :

The most recent request was denied because it contained an invalid security token. Please refresh the page and try again.

Thanks for your answers.

Answer 1

Try removing this line;

$app->close();