on_section function

Observe events on story map section transitions

For a given story_section(), you may want to trigger an event when the section becomes visible. This function wraps shiny::observeEvent() to allow you to modify the state of your map or invoke other Shiny actions on user scroll.

on_section(map_id, section_id, handler)

Arguments

• map_id: The ID of your map output
• section_id: The ID of the section to trigger on, defined in story_section()
• handler: Expression to execute when section becomes visible.