Catch browser's “zoom” event in JavaScript

Question

Is it possible to detect, using JavaScript, when the user changes the zoom in a page? I simply want to catch a \"zoom\" event and respond to it (similar to window.onresize e

Answer 1

Here is a native way (major frameworks cannot zoom in Chrome, because they dont supports passive event behaviour)

//For Google Chrome
document.addEventListener("mousewheel", event => {
  console.log(`wheel`);
  if(event.ctrlKey == true)
  {
    event.preventDefault();
    if(event.deltaY > 0) {
      console.log('Down');
    }else {
      console.log('Up');
    }
  }
}, { passive: false });

// For Mozilla Firefox
document.addEventListener("DOMMouseScroll", event => {
  console.log(`wheel`);
  if(event.ctrlKey == true)
  {
    event.preventDefault();
    if(event.detail > 0) {
      console.log('Down');
    }else {
      console.log('Up');
    }
  }
}, { passive: false });