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HTTP/2 301 date: Fri, 26 Dec 2025 06:55:59 GMT content-type: text/html; charset=UTF-8 location: https://jqueryui.com/addClass/ server: cloudflare cache-control: public, max-age=14400 x-powered-by: PHP/8.2.29 vary: X-Forwarded-Proto, accept-encoding reporting-endpoints: csp-endpoint="https://csp-report-api.openjs-foundation.workers.dev/" content-security-policy: default-src 'self'; script-src 'self' code.jquery.com download.jqueryui.com; style-src 'self' 'unsafe-inline' code.jquery.com download.jqueryui.com; style-src-attr 'unsafe-inline'; img-src 'self' data: code.jquery.com download.jqueryui.com; connect-src 'self' typesense.jquery.com; font-src 'self' data:; object-src 'none'; frame-ancestors 'none'; base-uri 'self'; block-all-mixed-content ; report-to csp-endpoint; report-uri https://csp-report-api.openjs-foundation.workers.dev/; form-action 'self' download.jqueryui.com; x-redirect-by: WordPress cf-cache-status: MISS expires: Fri, 26 Dec 2025 10:55:59 GMT cf-ray: 9b3eacf6f86fc16f-BLR HTTP/2 200 date: Fri, 26 Dec 2025 06:55:59 GMT content-type: text/html; charset=UTF-8 server: cloudflare vary: Accept-Encoding vary: X-Forwarded-Proto x-powered-by: PHP/8.2.29 reporting-endpoints: csp-endpoint="https://csp-report-api.openjs-foundation.workers.dev/" content-security-policy: default-src 'self'; script-src 'self' code.jquery.com download.jqueryui.com; style-src 'self' 'unsafe-inline' code.jquery.com download.jqueryui.com; style-src-attr 'unsafe-inline'; img-src 'self' data: code.jquery.com download.jqueryui.com; connect-src 'self' typesense.jquery.com; font-src 'self' data:; object-src 'none'; frame-ancestors 'none'; base-uri 'self'; block-all-mixed-content ; report-to csp-endpoint; report-uri https://csp-report-api.openjs-foundation.workers.dev/; form-action 'self' download.jqueryui.com; link: ; rel="https://api.w.org/" link: ; rel="alternate"; title="JSON"; type="application/json" content-encoding: gzip cf-cache-status: BYPASS cf-ray: 9b3eacfb8b0cc16f-BLR Add Class | jQuery UI

jQuery UI

Add Class

Adds class(es) to elements while animating all style changes.

Examples

This demo adds a class which animates: text-indent, letter-spacing, width, height, padding, margin, and font-size.

view source

	
		
				
				
				
				
					<!DOCTYPE html><html lang="en"><head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>jQuery UI Effects - addClass demo</title>
  <link rel="stylesheet" href="https://code.jquery.com/ui/1.14.1/themes/base/jquery-ui.css">
  <link rel="stylesheet" href="/resources/demos/style.css">
  <style>
    .toggler { width: 500px; height: 200px; position: relative; }
    #button { padding: .5em 1em; text-decoration: none; }
    #effect { width: 240px;  padding: 1em; border: 1px solid #000; background: #eee; color: #333; }
    .newClass { text-indent: 40px; letter-spacing: .4em; width: 410px; height: 120px; padding: 30px; margin: 10px; font-size: 1.1em; }
  </style>
  <script src="https://code.jquery.com/jquery-3.7.1.js"></script>
  <script src="https://code.jquery.com/ui/1.14.1/jquery-ui.js"></script>
  <script>
  $( function() {
    $( "#button" ).on( "click", function() {
      $( "#effect" ).addClass( "newClass", 1000, callback );
    });
 
    function callback() {
      setTimeout(function() {
        $( "#effect" ).removeClass( "newClass" );
      }, 1500 );
    }
  } );
  </script>
</head>
<body>
 
<div class="toggler">
  <div id="effect" class="ui-corner-all">
      Etiam libero neque, luctus a, eleifend nec, semper at, lorem. Sed pede.
  </div>
</div>
 
<button id="button" class="ui-state-default ui-corner-all">Run Effect</button>
 
 
 
 
</body></html>

				
			

	

Want to learn more about the .addClass() method? Check out the API documentation.

Original Source | Taken Source