Posted By
Bajarangi soft ,
Posted On 01-10-2020
The window.matchMedia() method returns a MediaQueryList object representing the results of the specified CSS media query string.
The value of the matchMedia() method can be any of the media features of the CSS @media rule, like min-height, min-width, orientation, etc.
The MediaQueryList object has two properties and two methods:
| Property | Description |
|---|---|
| matches | Used to check the results of a query. Returns a boolean value: true if the document matches the media query list, otherwise false |
| media | A String, representing the serialized media query list |
| Method | Description |
|---|---|
| addListener(functionref) | Adds a new listener function, which is executed whenever the media query's evaluated result changes |
| removeListener(functionref) | Removes a previously added listener function from the media query list. Does nothing if the specified listener is not already in the list |
window.matchMedia(mediaQueryString)
| Parameter | Description |
|---|---|
| mediaQueryString | Required. A string representing the media query for which to return a new MediaQueryList object |
<button class="btn btn-primary" onclick="myFunction()">CLick it</button>
<h2 id="demo"></h2>
<script>
function myFunction() {
var x = document.getElementById("demo");
if (window.matchMedia("(max-width: 700px)").matches) {
x.innerHTML = "The screen is less than, or equal to, 700 pixels wide.";
} else {
x.innerHTML = "The screen is at least 700 pixels wide.";
}
}
</script>
<script>
function adjust_window(x) {
if (x.matches) { // If media query matches
document.body.style.backgroundColor = "green";
} else {
document.body.style.backgroundColor = "lightblue";
}
}
var x = window.matchMedia("(max-width: 700px)")
adjust_window(x) // Call listener function at run time
x.addListener(adjust_window) // Attach listener function on state changes
</script>
<!DOCTYPE html>
<html>
<head>
<title> Window MatchMedia Method In Java Script</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css">
</head>
<body>
<div class="container">
<div class="text-center">
<h1>Window MatchMedia Method In Java Script</h1>
</div>
<br>
<div class="well">
<button class="btn btn-primary" onclick="get_alert()">CLick it</button>
<h2 id="demo"></h2>
<script>
function get_alert() {
var x = document.getElementById("demo");
if (window.matchMedia("(max-width: 700px)").matches) {
x.innerHTML = "The screen is less than, or equal to, 700 pixels wide.";
} else {
x.innerHTML = "The screen is at least 700 pixels wide.";
}
}
</script>
</div>
</body>
</html>