Created
August 15, 2025 06:53
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Rails concern for queueing analytics events in flash and rendering them once per tab as dataLayer.push(...) calls guarded by sessionStorage to prevent duplicates.
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| # app/controllers/concerns/track_events.rb | |
| module TrackEvents | |
| extend ActiveSupport::Concern | |
| included do | |
| helper_method :render_data_layer_events | |
| delegate :tag, to: :view_context, private: true | |
| end | |
| def data_layer_events = flash[:data_layer_events] ||= [] | |
| def track_event(event_name, parameters = {}) = data_layer_events << { event: event_name, **parameters } | |
| def render_data_layer_events | |
| events = data_layer_events | |
| return if events.empty? | |
| javascript_code = [ | |
| "window.dataLayer=window.dataLayer||[];", | |
| *events.map { |event_data| | |
| key = "dl_#{event_data.hash}" | |
| "if(!sessionStorage.getItem(#{key.to_json})){dataLayer.push(#{event_data.to_json});sessionStorage.setItem(#{key.to_json},'1');}" | |
| } | |
| ].join | |
| tag.script(javascript_code.html_safe) | |
| end | |
| end |
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