d3.event

d3.event

The current event, if any. This is set during the invocation of an event listener, and is reset after the listener terminates. Use this to access standard event fields such as event.timeStamp and methods such as event.preventDefault. While you can use the native event.pageX and event.pageY, it is often more convenient to transform the event position to the local coordinate system of the container that received the event using d3.mouse, d3.touch or d3.touches.

If you use Babel, Webpack, or another ES6-to-ES5 bundler, be aware that the value of d3.event changes during an event! An import of d3.event must be a live binding, so you may need to configure the bundler to import from D3’s ES6 modules rather than from the generated UMD bundle; not all bundlers observe jsnext:main. Also beware of conflicts with the window.event global.