Events in Kontrast

Many objects in Kontrast emit events. You can subscribe to events using the addEventListener functions on the object, providing the name of the event and a custom function that should be called whenever the event is emitted (or fired).

Note that the name of the function addEventListener is deliberately chosen to be the same as the function used for DOM manipulations (see the corresponding MDN page on EventTarget.addEventListener()). However, in contrast to the DOM version of the function, an exception is thrown if the event name does not exist.

Please refer to the tutorial for an introductory example on how to use events.

The names and descriptions of available events can be found in the documentation for each object and in the reference index.

Functions

• addEventListener(eventName: string, callback: function)
  Registers the callback function as an event listener for the specified event name.
• clearEventListener(eventName: string)
  Remove all event listener callbacks associated with the event name.

Examples

• Interactive data updates
• Limiting the range of an axis
• Polygon cursor
• Range cursor
• Reacting to changes of axis limits
• Reciprocal axis mapping
• Slider events
• Synchronizing two axes