The deprecated addListener()
method of the
MediaQueryList
interface adds a listener to the
MediaQueryListener
that will run a custom callback function in response to
the media query status changing.
This is basically an alias of EventTarget.addEventListener()
, retained for
backwards compatibility purposes. Older browsers should use addListener
instead of addEventListener
since MediaQueryList
only inherits
from EventTarget
in newer browsers.
Syntax
MediaQueryList.addListener(func)
Parameters
- func
- A function or function reference representing the callback function you want to run when the media query status changes.
Return value
Void.
Example
var paragraph = document.querySelector('p');
var mediaQueryList = window.matchMedia('(max-width: 600px)');
function screenTest(e) {
if (e.matches) {
/* the viewport is 600 pixels wide or less */
paragraph.textContent = 'This is a narrow screen — 600px wide or less.';
document.body.style.backgroundColor = 'pink';
} else {
/* the viewport is more than than 600 pixels wide */
paragraph.textContent = 'This is a wide screen — more than 600px wide.';
document.body.style.backgroundColor = 'aquamarine';
}
}
mediaQueryList.addListener(screenTest);
Specifications
Specification | Status | Comment |
---|---|---|
CSS Object Model (CSSOM) View Module The definition of 'addListener' in that specification. |
Working Draft | Initial definition |
Browser compatibility
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