The onchange property of the MediaQueryList interface is an event handler property representing a function that is invoked when the change event fires, i.e when the status of media query support changes. The event object is a MediaQueryListEvent instance, which is recognized as a MediaListQuery instance in older browsers, for backwards compatibility purposes.


MediaQueryList.onchange = function() { ... };


var mql = window.matchMedia('(max-width: 600px)');

mql.addEventListener( "change", (e) => {
    if (e.matches) {
    /* the viewport is 600 pixels wide or less */
    console.log('This is a narrow screen — less than 600px wide.')
  } else {
    /* the viewport is more than than 600 pixels wide */
    console.log('This is a wide screen — more than 600px wide.')


Specification Status Comment
CSS Object Model (CSSOM) View Module
The definition of 'onchange' in that specification.
Working Draft Initial definition

Browser compatibility

BCD tables only load in the browser

See also