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typo3fluidtypo3-9.xview-helpers

"Undeclared arguments passed to ViewHelper" Exception

After updating TYPO3, I get a TYPO3Fluid\Fluid\Core\ViewHelper\Exception "Undeclared arguments passed to ViewHelper ... Valid arguments are."

Solution

  • Tip: Use rector to make these (and other) conversions! Functions for TYPO3 are available, see

    This may be due to an extension using functionality that has been dropped. Using only the TYPO3 core, you should not see this error.

    In your extension: If you still use the render() method in your ViewHelper class with arguments, you may want to replace this:

    before:

    public function render(Mail $mail, $type = 'web', $function = 'createAction')

    after:

    public function initializeArguments()
{
    parent::initializeArguments();

    $this->registerArgument('mail', Mail::class, 'Mail', true);
    $this->registerArgument('type', 'string', 'type: web | mail', false, 'web');
    $this->registerArgument('function', 'string', 'function: createAction | senderMail | receiverMail', false, 'createAction');
}

public function render()
{
    $mail = $this->arguments['mail'];
    $type = $this->arguments['type'] ?? 'web';
    // ...  

}

    Additionally,

    • if there is no need to use render() (e.g. unless you need to access $this variables), you may want to switch to renderStatic() for performance reasons (see also this other Stack Overflow answer "What is the difference between render() and renderStatic() ..." for clarification)
    • inherit from classes in TYPO3Fluid\Fluid\Core\ViewHelper instead of TYPO3\CMS\Fluid\Core\ViewHelper:
    // use TYPO3\CMS\Fluid\Core\ViewHelper\AbstractViewHelper;
use TYPO3Fluid\Fluid\Core\ViewHelper\AbstractViewHelper;

    Documentation:

    Changelogs: