How can I uncheck a checkbox programmatically in Drupal 8. I need this in an ajax call, when an option is selected, a checkbox must be unchecked


After a lot of trial and error, I found out:

Imagine a checkbox with name 'Coffee' has one option: ['Y' => 'I want an espresso'].

To uncheck this selection, enter: $form['Coffee']['Y'][#checked]=false

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