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As the title says I want to know how to add a custom operation in the drupal 8 book admin edit form's operations. I need this for my module in which I want to provide Add Sub Page operation for the user.

enter image description here Upon clicking on the operation, I want to execute a function to add a new page to the parent page. I know how to add pages programmatically (Thanks to Lisa regarding help for adding pages in the book) , the only thing that I need is this operation entry in the drop down list.

Can somebody please help?

  • I don't have an answer, but I think you're going to need to implement a hook to alter the form, which is built in Drupal\book\Form\BookAdminEditForm. Take a look at bookAdminTableTree(), the $form[$id]['operations'] code in particular. You'll need to add a $form['id]['operations']['#links']['add-sub-page'] item for each page in the book. It looks like it'll be fairly complicated, so perhaps somebody has a better idea... – user72086 Jul 17 '17 at 13:41
  • Another random idea for an alternative approach: instead of using a hook to alter the form, extend the BookAdminEditForm class with your own custom class. Then implement your own bookAdminTableTree() method, with the modified operations links. Then alter the existing /admin/structure/book/{node} route (book.admin_edit) in book.routing.yml with a route to your new custom form class. See drupal.org/docs/8/api/routing-system/… and the setDefault() method in the Route class: – user72086 Jul 17 '17 at 13:46
  • Route class link didn't fit in my comment above: api.drupal.org/api/drupal/… – user72086 Jul 17 '17 at 13:46
  • Just found this tutorial which seems helpful: jaypan.com/tutorial/… – user72086 Jul 17 '17 at 13:47
  • @Lisa Your alternative approach worked! Please post that as an answer. – Shujaat Ali Khan Jul 17 '17 at 16:07
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You can override the bookAdminTableTree() method in the BookAdminEditForm class by extending core/modules/book/src/Form/BookAdminEditForm.php with your own custom form class. You can copy the bookAdminTableTree() method's code and then add an item to the $form[$id]['operations']['#links'] array for 'add-sub-page' (or whatever you want to name the new operation.)

Then alter the existing /admin/structure/book/{node} route (book.admin_edit) in book.routing.yml with a route to your new custom form class. See www.drupal.org/docs/8/api/routing-system/altering-existing-routes-and-adding-new-routes-based-on-dynamic-ones and the setDefault() method in the Route class: api.drupal.org/api/drupal/vendor%21symfony%21routing%21Route.php/class/Route/8.2.x

This is a helpful tutorial that describes the overall approach: https://www.jaypan.com/tutorial/drupal-8-extending-core-configuration-extending-core-forms-and-overriding-core-routes

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