8
Nov.2018
Drupal 10: A custom validator for checking Start time field depending on the value of End Time
In one project I use two independent time fields provided by Time Field module and called "Start Time" field_work_start_time and "End Time"field_work_end_time. Both fields are optional, indecencies and don't know about each other. However, if "End Time" is selected, I need to check "Start Time" and display a message, so the first field shouldn't be empty and "End Time" should be greater or equal.
This code shows how I implemented the solution, which checks a few fields at the same time.
Look also my previous article there we have the similar code for Datetime and works with Start/End Date field.
File
[MODULE_NAME]/[MODULE_NAME].module
<?php use Drupal\Core\Entity\EntityTypeInterface; /** * Implements hook_entity_bundle_field_info_alter(). */ function [MODULE_NAME]_entity_bundle_field_info_alter(&$fields, EntityTypeInterface $entity_type, $bundle) { if (!empty($fields['field_work_end_time'])) { $fields['field_work_end_time']->addConstraint('StartEndTimeChecking'); } }
File
[MODULE_NAME]/src/Plugin/Validation/Constraint/StartEndTimeCheckingConstraint.php
<?php namespace Drupal\[MODULE_NAME]\Plugin\Validation\Constraint; use Symfony\Component\Validator\Constraint; /** * Checks if "End Time" not empty. * * "Start Time" must be not empty * and "End Time" must be greater then "Start Time". * * @Constraint( * id = "StartEndTimeChecking", * label = @Translation("Start/End Time checking", context = "Validation") * ) */ class StartEndTimeCheckingConstraint extends Constraint { public $message = '"End Time" may not be less than "Start Time".'; }
File
[MODULE_NAME]/src/Plugin/Validation/Constraint/StartEndTimeCheckingConstraintValidator.php
<?php namespace Drupal\[MODULE_NAME]\Plugin\Validation\Constraint; use Symfony\Component\Validator\Constraint; use Symfony\Component\Validator\ConstraintValidator; use Drupal\Core\Datetime\DrupalDateTime; /** * Validates start/end time. */ class StartEndTimeCheckingConstraintValidator extends ConstraintValidator { /** * {@inheritdoc} */ public function validate($entity, Constraint $constraint) { $entity = $entity->getEntity(); $start_time = $entity->get('field_work_start_time')->getString(); $end_time = $entity->get('field_work_end_time')->getString(); // Nothing to do if $end_time is empty. if ($end_time == '') { return; } // If the $start_time is empty, // set zero to avoid a fatal error during creating from format. if ($start_time == '') { $start_time = 0; } $tz = drupal_get_user_timezone(); $start_datetime = DrupalDateTime::createFromFormat('U', $start_time, $tz); $end_datetime = DrupalDateTime::createFromFormat('U', $end_time, $tz); if ($start_datetime > $end_datetime || $start_time == '') { $this->context->addViolation($constraint->message); } } }
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