core-bundle/src/Resources/contao/forms/FormSelectMenu.php
public function validate()
	{
		$mandatory = $this->mandatory;
		$options = $this->getPost($this->strName);

		// Check if there is at least one value
		if ($mandatory && \is_array($options))
		{
			foreach ($options as $option)
			{
				if (\strlen($option))
				{
					$this->mandatory = false;
					break;
				}
			}
		}

		$varInput = $this->validator($options);

		// Check for a valid option (see #4383)
		if (!empty($varInput) && !$this->isValidOption($varInput))
		{
			$this->addError($GLOBALS['TL_LANG']['ERR']['invalid']);
		}

		// Add class "error"
		if ($this->hasErrors())
		{
			$this->class = 'error';
		}
		else
		{
			$this->varValue = $varInput;
		}

		// Reset the property
		if ($mandatory)
		{
			$this->mandatory = true;
		}
	}
public function validate()
	{
		$mandatory = $this->mandatory;
		$options = $this->getPost($this->strName);

		// Check if there is at least one value
		if ($mandatory && \is_array($options))
		{
			foreach ($options as $option)
			{
				if (\strlen($option))
				{
					$this->mandatory = false;
					break;
				}
			}
		}

		$varInput = $this->validator($options);

		// Check for a valid option (see #4383)
		if (!empty($varInput) && !$this->isValidOption($varInput))
		{
			$this->addError($GLOBALS['TL_LANG']['ERR']['invalid']);
		}

		// Add class "error"
		if ($this->hasErrors())
		{
			$this->class = 'error';
		}
		else
		{
			$this->varValue = $varInput;
		}

		// Reset the property
		if ($mandatory)
		{
			$this->mandatory = true;
		}
	}
public function validate ( ) { $ mandatory = $ this -> mandatory ; $ options = $ this -> getPost ( $ this -> strName ) ; // Check if there is at least one value if ( $ mandatory && \ is_array ( $ options ) ) { foreach ( $ options as $ option ) { if ( \ strlen ( $ option ) ) { $ this -> mandatory = false ; break ; } } } $ varInput = $ this -> validator ( $ options ) ; // Check for a valid option (see #4383) if ( ! empty ( $ varInput ) && ! $ this -> isValidOption ( $ varInput ) ) { $ this -> addError ( $ GLOBALS [ 'TL_LANG' ] [ 'ERR' ] [ 'invalid' ] ) ; } // Add class "error" if ( $ this -> hasErrors ( ) ) { $ this -> class = 'error' ; } else { $ this -> varValue = $ varInput ; } // Reset the property if ( $ mandatory ) { $ this -> mandatory = true ; } }
Check options if the field is mandatory
Check options if the field is mandatory