Class: Dommy::Rack::Trace::DomObserver

Inherits:
Object
  • Object
show all
Defined in:
lib/dommy/rack/trace/dom_observer.rb

Overview

Watches a window's DOM through a MutationObserver and turns raw mutation records into compact summaries (target:, count:/attr:). Pure translation: it holds no event stream and decides nothing about ordering or coalescing — each summary is handed to the block the Trace supplies, which records it. Inert (observes nothing) when the window has no .

Instance Method Summary collapse

Constructor Details

#initialize(window, &on_summary) ⇒ DomObserver

Returns a new instance of DomObserver.



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# File 'lib/dommy/rack/trace/dom_observer.rb', line 12

def initialize(window, &on_summary)
  @on_summary = on_summary
  body = window&.document&.body
  return unless body

  @observer = Dommy::MutationObserver.new(window, method(:deliver))
  # `observe` is the observer's JS-bridge entry point (Ruby-private), so
  # drive it through the public bridge call.
  @observer.__js_call__("observe",
    [body, {childList: true, subtree: true, attributes: true, characterData: true}])
end