JavaScript implements modifying pseudo-class styles

In projects, we often need to use JavaScript to dynamically control the style of elements (:before,:after), but we all know that JavaScript or jQuery does not have pseudo-class selectors. In this article, we mainly introduce the method of modifying pseudo-class styles in JavaScript and the code implementation process.

HTML

6f23bfb838f442699a99d538155cf763Hi, this is a plain-old, sad-looking paragraph tag.94b3e26ee717c64999d7867364b1b4a3

CSS

.red::before {
content: 'red';
color: red;
}

Method 1

Use JavaScript or jQuery to switch e388a4556c0f65e1904146cc1a846beeThe class name of the element, modify the style.

.green::before {
content: 'green';
color: green;
}
$('p').removeClass('red').addClass('green');

Method 2

Dynamically insert new styles into existing c9ccee2e6ea535a969eb3f532ad9fe89.

document.styleSheets[0].addRule('.red::before','color: green');
document.styleSheets[0].insertRule('.red::before { color: green }', 0);

Method 3

Create a new stylesheet and insert it into the 93f0f5c25f18dab9d176bd4f6de5d30e using JavaScript or jQuery

// Create a new style tag
var style = document.createElement("style");

// Append the style tag to head
document.head.appendChild(style);

// Grab the stylesheet object
sheet = style.sheet

// Use addRule or insertRule to inject styles
sheet.addRule('.red::before','color: green');
sheet.insertRule('.red::before { color: green }', 0);

jQuery

$(&#39;<style>.red::before{color:green}</style>&#39;).appendTo(&#39;head&#39;);

Method 4

Use HTML5 data-attribute , use attr() in the attribute to modify it dynamically.

<p class="red" data-attr="red">Hi, this is plain-old, sad-looking paragraph tag.</p>
.red::before {
content: attr(data-attr);
color: red;
}
$(&#39;.red&#39;).attr(&#39;data-attr&#39;, &#39;green&#39;);

Related recommendations:

Summary of pseudo-class selectors

Pseudo-types in PHP And pseudo-variables

php function regular parameter function and pseudo-type parameter function

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