How to get css attribute value in js-JS Tutorial-php.cn

How to get css attribute value in js

青灯夜游

Release： 2023-01-07 11:42:12

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JS method to obtain css attribute value: 1. Obtain through the style attribute of the element object, the syntax is "element object.style.property name"; 2. Through the getComputerStyle attribute, the syntax is "getComputerStyle.property name".

How to get css attribute value in js

The operating environment of this tutorial: windows7 system, javascript version 1.8.5, Dell G3 computer.

obj.style:

This method can only get the value written in the style attribute, but cannot get the value defined in <style type='text /css'>The properties inside

<style type=”text/css”> 
.ss{color:#cdcdcd;}  
</style>  
<div id=”css88″ class=”ss” style=”width:200px; height:200px; background:#333333″>JS获取CSS属性值
</div>  
<script type=”text/javascript”> 
alert(document.getElementById(“css88″).style.width);//200px 
alert(document.getElementById(“css88″).style.color);//空白 
</script>

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obj.currentStyle and getComputerStyle

obj.currentStyle is only supported by IE, while getComputerStyle is supported in FireFox. This method accepts two parameters: To get the calculated style of the element and a pseudo-element string (such as ";after"). If pseudo-element information is not required, the second parameter can be null. This method returns a CSSStyleDeclaration object containing all calculated styles for the current element.

<html> 
<head> 
<title>计算元素样式</title> 
<style> 
#myDiv { 
    width:100px; 
    height:200px; 
} 
</style> 
<body> 
<div id ="myDiv" style=" border:1px solid black"></div> 
 
<script> 
var myDiv = document.getElementById("myDiv"); 
var computedStyle = document.defaultView.getComputedStyle(myDiv, null); 
 
alert(computedStyle.backgroundColor); //"red" 
alert(computedStyle.width); //"100px" 
alert(computedStyle.height); //"200px" 
alert(computedStyle.border); //在某些浏览器中是“1px solid black” 
</script> 
</body> 
</head> 
</html>

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So it is estimated to be compatible with browsers. We can encapsulate a function to get the CSS attribute value of an element:

function getStyle(element, attr) {
        if(element.currentStyle) {
                return element.currentStyle[attr];
        } else {
                return getComputedStyle(element, false)[attr];
        }
}

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