MediaQueryList: addListener() method
Deprecated
Avoid using this feature in new projects. This feature may be a candidate for removal from web standards or browsers.
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.
In older browsers MediaQueryList did not yet inherit from EventTarget,
so this method was provided as an alias of EventTarget.addEventListener().
Use addEventListener() instead of addListener() if it is
available in the browsers you need to support.
Syntax
js
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
None (undefined).
Examples
js
const paragraph = document.querySelector("p");
const mediaQueryList = window.matchMedia("(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 600 pixels wide */
paragraph.textContent = "This is a wide screen — more than 600px wide.";
document.body.style.backgroundColor = "aquamarine";
}
}
mediaQueryList.addListener(screenTest);
Specifications
| Specification |
|---|
| CSSOM View Module # dom-mediaquerylist-addlistener |