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I am new to Craft but loving its ease of use so far.
I am having a problem however when setting up a plugin to display an error to the user when using the onBeforeSaveEntry hook when a user saves an entry. I am looking to determine the value of a field and then take the user back to the entry page and display an error to the user based on a certain selection. Is this something that can be done with the Craft page when saving an entry?
Is this something that can be done with the Craft page when saving an entry?
In 2.2, there isn't an easy way. In the upcoming 2.3 release, we added a $performAction property to the event, so your can do something like:
$entry->addError('attribute', 'MyErrorMessage');
$event->performAction = false;
And Craft will not save the entry and return to the edit entry page to display any validation errors.
You should post your second question as an entirely new question.
$event->params['entry']->addError('MyFieldHandle', 'MyErrorMessage');