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In articles, I have created a series of custom fields, including two date fields and a checkboxes field. Now, through a plugin in the onContentBeforeSave event I need to verify that if date 1 is less than date 2 then set the value of the checkbox field. For this I try the following

<?php defined( '_JEXEC' ) or die( 'Restricted access' ); class plgContentAlertcustomfieldhandler extends JPlugin { public function onContentBeforeSave($context, &$article, $isNew, $data) { if ($context === 'com_content.article') { $date1 = strtotime($data['com_fields']['date1']); $date2 = strtotime($data['com_fields']['date2']); if ($date1 < $date2) { $data['com_fields']['alert'][0] = 'alert'; } } return true; } }

I try to set the value in this line:

$data['com_fields']['alert'][0] = 'alert';

This custom field has only one checkbox, defined with the name Alert and with the value alert.

Update 1:

I am trying $data['com_fields']['alert'] = true; but I am getting the same result.

Update 2:

If I manually set a value to the checkbox, debugging I can verify that the value assigned to alert in $data is

array ( 0 => 'alert', )

I try to apply this same value programmatically as follows

$data['com_fields']['alert'] = ['alert'];

But the value is not persisted, at the end of the process of saving and refreshing the view the checkbox remains unchecked

Update 3

Following the process of saving through debugging I identify that if I programmatically assign the value to the custom field through $data ['com_fields']['alert'] = ['alert']; when arriving to the save method in libraries/src/MVC/Model/AdminModel.php in the argument $data the value of alert is false, while if I set a value manually when arriving at this method in$data the value of the alert field is [0 => 'alert'] and consequently the value of the checkbox is assigned.

Update 4

The typo error pointed out by alexandreelise is now repaired. The problem still persists.

Update 5

Using debug I managed to identify that it doesn't matter which field within $ data['com_fields'] I modify in the onContentBeforeSave event once it delegates to the trigger method of the JEventDispatcher class located at libraries/joomla/event/dispatcher.php the argument $args that includes in the index 3 the data to be persisted including those of com_fields retain the values set by the user even if they have been programmatically modified as in the example I described. Eventually this data is passed to libraries/src/MVC/Model/AdminModel.php in the save method that has the argument $data the data to be inserted preserves the values set by the user. Right now I think that maybe the solution is to try to modify these values in another event maybe before onContentBeforeSave. Thanks again for any ideas

I appreciate your advice

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  • Hi, Is there a particular reason why you would use checkboxes for only one checkbox? Maybe you should use a radio button for that. Just my 2 cents piece of advise. Commented Oct 30, 2019 at 2:44
  • for now it's the requirement that I have Commented Oct 30, 2019 at 3:20

1 Answer 1

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Basically you needed to use onContentAfterSave rather then onContentBeforeSave and use the FieldsHelper in conjuction with the FieldsModelField.

Here is the code:

<?php defined( '_JEXEC' ) or die( 'Restricted access' ); class plgContentAlertcustomfieldhandler extends JPlugin { public function onContentAfterSave($context, &$article, $isNew) { if ($context === 'com_content.article') { $custom_fields = FieldsHelper::getFields($context, $article, true); $custom_fields_by_name = \Joomla\Utilities\ArrayHelper::pivot($custom_fields, 'name'); $date1 = strtotime($custom_fields_by_name['date1']->value); $date2 = strtotime($custom_fields_by_name['date2']->value); if ($date1 < $date2) { //define the value you want to assign $your_custom_field_value = 'alert'; JModelLegacy::addIncludePath(JPATH_ADMINISTRATOR . '/components/com_fields/models'); /** * @var FieldsModelField $model_field */ $model_field = JModelLegacy::getInstance('Field', 'FieldsModel', ['ignore_request' => true]); //set the value using field model instead to make change permanent in db $model_field->setFieldValue( $custom_fields_by_name['alert']->id, $article->id, $your_custom_field_value ); } } return true; } }

UPDATE:

Second version of the code toggling on and off the checkbox when your requirement is not met.

<?php defined( '_JEXEC' ) or die( 'Restricted access' ); class plgContentAlertcustomfieldhandler extends JPlugin { public function onContentAfterSave($context, &$article, $isNew) { if ($context === 'com_content.article') { $custom_fields = FieldsHelper::getFields($context, $article, true); $custom_fields_by_name = \Joomla\Utilities\ArrayHelper::pivot($custom_fields, 'name'); $date1 = strtotime($custom_fields_by_name['date1']->value); $date2 = strtotime($custom_fields_by_name['date2']->value); $your_custom_field_value = ''; if ($date1 < $date2) { //define the value you want to assign $your_custom_field_value = 'alert'; } JModelLegacy::addIncludePath(JPATH_ADMINISTRATOR . '/components/com_fields/models'); /** * @var FieldsModelField $model_field */ $model_field = JModelLegacy::getInstance('Field', 'FieldsModel', ['ignore_request' => true]); //set the value using field model instead to make change permanent in db $model_field->setFieldValue( $custom_fields_by_name['alert']->id, $article->id, $your_custom_field_value ); } return true; } }
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