Getting started

Twig Hooks are a robust and powerful alternative to the Sonata Block Events and the old Sylius Template Events systems.

Main features

• built-in support for Twig templates, Twig Components and Symfony Live Components

• adjustability

• autoprefixing hooks

• configurable hookables

• priority mechanism

• easy enable/disable mechanism for each hook

Installation

Install the package using Composer and Symfony Flex:

composer require sylius/twig-hooks

Your first hook & hookable

Once Twig Hooks is installed, you can open any Twig file and define your first hook.

some.html.twig

{% hook 'my_first_hook' %}

This way, my_first_hook becomes a unique name which we can use to hook into that specific spot.

The ideal hook name:

• is lowercase

• has its logical parts separated with dots (.)

• when there is more than one word, they are separated by underscores (_)

Recommended:

• index

• index.sidebar

• index.top_menu

Not recommended:

• index

• indextopmenu

Hooking into a hook

For the purpose of this example, let's consider we want to render the some_block.html.twig template inside the my_first_hook hook. First step is to create a twig_hooks.yaml file (or any other format you use) under the config/packages/ directory (if you don't have one already, of course).

Now, we can define our first hookable with the following configuration:

config/packages/twig_hooks.yaml

sylius_twig_hooks:
    hooks:
        'my_first_hook':
            some_block:
                template: 'some_block.html.twig'

Decomposing the example above we can notice that:

1. sylius_twig_hooks is the main key for Twig Hooks configuration

2. hooks is a configuration key for defining hookables for all hooks

3. my_first_hook is our hook name, defined on the Twig file level

4. some_block is the name of our hookable, it can be any string, but it should be unique for a given hook unless you want to override the existing hookable (if you want to read more about overriding hookables check the overriding-hookables.md section)

5. finally we have a template key that defines which template should be rendered inside the my_first_hook hook

Possible hookable configuration options

Depending on the hookable template, we can pass different configuration options while defining hookables:

Hookable Template

sylius_twig_hooks:
    hooks:
        'my_first_hook':
            some_block:
                template: 'some_block.html.twig'
                enabled: true # whether the hookable is enabled
                context: [] # key-value pair that will be passed to the context bag
                configuration: [] # key-value pair that will be passed to the configuration bag
                priority: 0 # priority, the higher the number, the earlier the hookable will be hooked

Hookable Component