Custom Eel Helpers

Eel Helpers provide methods that can be used inside of Eel expressions. That is mostly used to extend the capabilities for data-aquisition and processing of Fusion.

#Define the class

The first step is to create the EelHelper class. Every Helper has to implement the interface Neos\Eel\ProtectedContextAwareInterface.

<?php
declare(strict_types=1);

namespace Vendor\Site\Eel\Helper;

use Neos\Flow\Annotations as Flow;
use Neos\Eel\ProtectedContextAwareInterface;

class ExampleHelper implements ProtectedContextAwareInterface {

    /**
     * Wrap the incoming string in curly brackets
     *
     * @param $text string
     * @return string
     */
    public function wrapInCurlyBrackets(string $text) {
        return '{' . $text . '}';
    }

    /**
     * All methods are considered safe, i.e. can be executed from within Eel
     *
     * @param string $methodName
     * @return boolean
     */
    public function allowsCallOfMethod(string $methodName) {
        return true;
    }
}

#Register the helper

Afterwards the name of the Helper has to be registered for usage in Fusion in the Settings.yaml of the package:

Neos:
  Fusion:
    defaultContext:
      'Vendor.Site.Example': 'Vendor\Site\Eel\Helper\ExampleHelper'

#Usage

In Fusion you can call the methods of the helper inside of EelExpressions:

exampleEelValue = ${Vendor.Site.Example.wrapInCurlyBrackets('Hello World')}

Custom Eel Helpers

#Define the class

#Register the helper

#Usage

#Learn more about Eel