The DOM provides features that can test the results of a media query programmatically, via the MediaQueryList
interface and its methods and properties. Once you've created a MediaQueryList
object, you can check the result of the query or receive notifications when the result changes.
Before you can evaluate the results of a media query, you need to create the MediaQueryList
object representing the query. To do this, use the window.matchMedia
method.
For example, to set up a query list that determines if the device is in landscape or portrait orientation:
var mediaQueryList = window.matchMedia("(orientation: portrait)");
Once you've created your media query list, you can check the result of the query by looking at the value of its matches
property:
if (mediaQueryList.matches) { /* The viewport is currently in portrait orientation */ } else { /* The viewport is not currently in portrait orientation, therefore landscape */ }
If you need to be aware of changes to the evaluated result of the query on an ongoing basis, it's more efficient to register a listener than to poll the query's result. To do this, call the addListener()
method on the MediaQueryList
object, with a callback function to invoke when the media query status changes (e.g., the media query test goes from true
to false
):
var mediaQueryList = window.matchMedia("(orientation: portrait)"); // Create the query list. function handleOrientationChange(mql) { ... } // Define a callback function for the event listener. mediaQueryList.addListener(handleOrientationChange); // Add the callback function as a listener to the query list. handleOrientationChange(mediaQueryList); // Run the orientation change handler once.
This code creates the orientation-testing media query list, then adds an event listener to it. After adding the listener, we also call the listener directly. This makes our listener perform adjustments based on the current device orientation; otherwise, our code might assume the device is in portrait mode at startup, even if it's actually in landscape mode.
The handleOrientationChange()
function would look at the result of the query and handle whatever we need to do on an orientation change:
function handleOrientationChange(evt) { if (evt.matches) { /* The viewport is currently in portrait orientation */ } else { /* The viewport is currently in landscape orientation */ } }
Above, we define the parameter as evt
— an event object. This makes sense because newer implementations of MediaQueryList
handle event listeners in a standard way. They no longer use the unusual MediaQueryListListener
mechanism, but a standard event listener setup, passing an event object of type MediaQueryListEvent
as the argument to the callback function.
This event object also includes the media
and matches
properties, so you can query these features of the MediaQueryList
by directly accessing it, or accessing the event object.
To stop receiving notifications about changes to the value of your media query, call removeListener()
on the MediaQueryList
, passing it the name of the previously-defined callback function:
mediaQueryList.removeListener(handleOrientationChange);
MediaQueryList
interfaceDesktop | ||||||
---|---|---|---|---|---|---|
Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | |
Basic support | 9 | Yes | 6 | 10 | 12.1 | 5 |
addListener |
9 | Yes | 6 | 10 | 12.1 | 5 |
matches |
9 | Yes | 6 | 10 | 12.1 | 5 |
media |
9 | Yes | 6 | 10 | 12.1 | 5 |
onchange |
Yes | ? | 55 | No | Yes | ? |
removeListener |
9 | Yes | 6 | 10 | 12.1 | 5 |
EventListener objects as parameters |
No | ? | 55 | No | No | ? |
MediaQueryList inheriting from EventTarget
|
Yes | 16 | 55 | No | Yes | Yes |
Mobile | |||||||
---|---|---|---|---|---|---|---|
Android webview | Chrome for Android | Edge Mobile | Firefox for Android | Opera for Android | iOS Safari | Samsung Internet | |
Basic support | Yes | 18 | Yes | ? | ? | ? | ? |
addListener |
? | ? | Yes | ? | ? | ? | ? |
matches |
? | ? | Yes | ? | ? | ? | ? |
media |
? | ? | Yes | ? | ? | ? | ? |
onchange |
No | Yes | ? | 55 | Yes | ? | ? |
removeListener |
? | ? | Yes | ? | ? | ? | ? |
EventListener objects as parameters |
No | No | ? | 55 | No | ? | ? |
MediaQueryList inheriting from EventTarget
|
Yes | Yes | 16 | 55 | Yes | Yes | ? |
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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/CSS/Media_Queries/Testing_media_queries