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Contao Flash Bag Message

This Symfony & Contao CMS bundle makes it possible to manage flash messages in an application. With very simple means, a separate message handler can be set up for each controller. Each handler stores the flash messages under a separate subkey in the SESSION. This prevents messages generated by other controllers from being mixed up. All messages are stored in their own subkey/namespace.

Inject the default built-in message handler into your controller

Creating a custom message handler

To create a new message handler, you only need to create a new message class, which:

• implements the Markocupic\ContaoFlashMessage\FlashMessage\MessageInterface interface
• extends the Markocupic\ContaoFlashMessage\FlashMessage\AbstractMessage class
• and tag it with the mc.flash_message.message_handler tag.
• don't forget to add the unique messageId attribute to the tag!
• Add the public method getTypes();. You decide which and how many message types (ERROR. INFO, SUCCESS) you want to add. The Traits can be used to add the message type constants an the helper methods.

The message handler is now registered as a service and can be integrated using dependency injection.

Query messages in Twig directly and in a structured way

Messages can also be queried directly (and selectively/structured) in Twig. The namespace must be specified for this.