Web.Event.EventTarget

data EventListener

A boxed function that can be used as an event listener. This is necessary due to the underlying implementation of Effect functions.

eventListener :: forall a. (Event -> Effect a) -> Effect EventListener

Creates an EventListener from a normal PureScript Effect function.

This function itself is effectful as otherwise it would break referential transparency - eventListener f /= eventListener f. This is worth noting as you can only remove the exact event listener value that was added for an EventTarget.

addEventListener :: EventType -> EventListener -> Boolean -> EventTarget -> Effect Unit

Adds a listener to an event target. The boolean argument indicates whether the listener should be added for the "capture" phase.

addEventListenerWithOptions :: EventType -> EventListener -> { capture :: Boolean, once :: Boolean, passive :: Boolean } -> EventTarget -> Effect Unit

Adds a listener to an event target.

• capture - whether the listener is added to the "capture" phase
• once - if true, indicates listener should be invokved at most once before being automatically removed.
• passive - indicates the callback function will never call preventDefault

removeEventListener :: EventType -> EventListener -> Boolean -> EventTarget -> Effect Unit

Removes a listener to an event target. The boolean argument indicates whether the listener should be removed for the "capture" phase.

dispatchEvent :: Event -> EventTarget -> Effect Boolean

Dispatches an event from an event target.

data EventTarget

A DOM item that can emit events.