JavaScript window.getComputedStyle() Method
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JavaScript window.getComputedStyle() Method
The window.getComputedStyle() method returns an object containing the values of all CSS properties of an element, after applying active stylesheets.
Example
HTML Online Editor
<!DOCTYPE html>
<html>
<head>
<style>
#test{
color: red;
}
</style>
</head>
<body>
<h2 id="test">Hello World!</h2>
<p id="point"></p>
<script>
var x = document.getElementById("point");
var y = document.getElementById("test");
var z = window.getComputedStyle(y, null);
var txt = z.getPropertyValue("color");
x.innerHTML = "h2 color is "+ txt;
</script>
</body>
</html>
Syntax
window.getComputedStyle(elem, pseudoElem)
Parameter Values
| Value | Type | Explanation |
|---|---|---|
| elem | Required | Specifies the Element for which to get the computed style. |
| pseudoElem | Optional | A string specifying the pseudo-element to match. |
Applying Pseudo Element
In the following example, we will apply the pseudo element (first-letter).
Example
HTML Online Editor
<!DOCTYPE html>
<html>
<head>
<style>
#test::first-letter{
color: red;
}
</style>
</head>
<body>
<h2 id="test">Hello World!</h2>
<p id="point"></p>
<script>
var x = document.getElementById("point");
var y = document.getElementById("test");
var z = window.getComputedStyle(y, "first-letter");
var txt = z.getPropertyValue("color");
x.innerHTML = "h2 color is "+txt;
</script>
</body>
</html>
Get All CSS Properties
Example
HTML Online Editor
<!DOCTYPE html>
<html>
<head>
<style>
#test{
color: red;
}
</style>
</head>
<body>
<h2 id="test">Hello World!</h2>
<p id="point"></p>
<script>
var x = document.getElementById("point");
var y = document.getElementById("test");
var z = window.getComputedStyle(y, null);
var txt = "";
for(i = 0; i < z.length; i++){
cssProp = z.item(i)
txt += cssProp +" : "+ z.getPropertyValue(cssProp) +"<br>";
}
x.innerHTML = txt;
</script>
</body>
</html>
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