D3 Event Action At A Distance
  Duration: 18:18
Part of Course: Intermediate D3 Course
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Takeaways:

  • d3.selection.on(type[, listener[, capture]]) adds an event listener to each element in the current selection
  • D3 invokes the listener in the same way it invokes other D3 operator functions - by passing the current datum "d", index "i", and the "this" context as the current DOM element
  • In most cases, when this happens, you will want to trigger some type of functionality that is directly related to the element that received the event
  • Since the JavaScript callback function allows you to run any code, you can also create new SVG DOM elements on the event trigger
  • Finally, not only can you interact with the element that received the event, as well as create, modify, and remove new elements, you can also interact with any other element you already have in your data visualization (as long as you can create a D3 selection of it)

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