require-checkbox-is-checked-on-wordpress-post-save.js

require-checkbox-is-checked-on-wordpress-post-save.js

( function ( $ ) {
	$( document ).ready( function () {

		// Require that one of the checkboxes is checked when publishing/updating posts
		$( 'body' ).on( 'submit.edit-post', '#post', function () {

			// If all three checkboxes are not checked,
			if ( ! $('#checkbox-one').attr('checked') && ! $('#checkbox-two').attr('checked') && ! $('#checkbox-three').attr('checked') ) {

				// Show the alert.
				window.alert( 'Checking one of the checkboxes is required.' );

				// Hide the spinner.
				$( '#major-publishing-actions .spinner' ).hide();

				// The buttons get "disabled" added to them on submit. Remove that class.
				$( '#major-publishing-actions' ).find( ':button, :submit, a.submitdelete, #post-preview' ).removeClass( 'disabled' );

				// Focus on the first checkbox field.
				$( "#checkboxOne" ).focus();

				// Prevent the create/update post form from being submitted.
				return false;
			}
		});
	});
}( jQuery ) );