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Action Hooks

There are a variety of action hooks, which allow injecting clickable actions into various parts of the UI.

reviewboard.extensions.hooks contains the following hooks:

Class Location
ReviewRequestActionHook The bar at the top of a review request (containing “Close”, “Update”, etc.)
DiffViewerActionHook Like the ReviewRequestActionHook, but limited to the diff viewer page.
HeaderActionHook An action in the page header.

When instantiating any of these, you can pass a list of dictionaries defining the actions you’d like to insert. These dictionaries have the following fields:

  • id: The ID of the action (optional)
  • label: The label for the action.
  • url: The URI to invoke when the action is clicked. If you want to invoke a javascript action, this should be ‘#’, and you should use a selector on the id field to attach the handler (as opposed to a javascript: URL, which doesn’t work on all browsers).
  • image: The path to the image used for the icon (optional).
  • image_width: The width of the image (optional).
  • image_height: The height of the image (optional).

There are also two hooks to provide drop-down menus in the action bars:

Class Location
ReviewRequestDropdownActionHook The bar at the top of a review request.
HeaderDropdownActionHook The page header.

These work like the basic ActionHooks, except instead of a url field, they contain an items field which is another list of dictionaries. Only one level of nesting is possible.


from reviewboard.extensions.base import Extension
from reviewboard.extensions.hooks import (HeaderDropdownActionHook,

class SampleExtension(Extension):
    def initialize(self):
        # Single entry on review requests, consumed from JavaScript.
        ReviewRequestActionHook(self, actions=[
                'id': 'sample-item',
                'label': 'Review Request Item',
                'url': '#',

        # A drop-down in the header that links to other pages.
        HeaderDropdownActionHook(self, actions=[
                'label': 'Header Dropdown',
                'items': [
                        'label': 'Item 1',
                        'url': '...',
                        'label': 'Item 2',
                        'url': '...',