JavaScript window resize event

Question

How can I hook into a browser window resize event?

There\'s a jQuery way of listening for resize events but I would prefer not to bring it into my project for just t

Answer 1

Solution for 2018+:

You should use ResizeObserver. It is a browser-native solution that has a much better performance than to use the resize event. In addition, it not only supports the event on the document but also on arbitrary elements.

var ro = new ResizeObserver( entries => {
  for (let entry of entries) {
    const cr = entry.contentRect;
    console.log('Element:', entry.target);
    console.log(`Element size: ${cr.width}px x ${cr.height}px`);
    console.log(`Element padding: ${cr.top}px ; ${cr.left}px`);
  }
});

// Observe one or multiple elements
ro.observe(someElement);

Currently, Firefox, Chrome, and Safari support it. For other (and older) browsers you have to use a polyfill.