Attaching ‘onclick’ event to D3 chart background

The event isn’t actually overridden, but both are triggered — the onclick handler for the SVG and for the bar. To prevent this, use the .stopPropagation() method (see the documentation). The code looks like this:

rect.on("click", function() {
  console.log("rect");
  d3.event.stopPropagation();
});

Complete example here. Compare with the behaviour with stopping the propagation of the event here.