{"id":9541,"date":"2021-01-21T15:04:52","date_gmt":"2021-01-21T20:04:52","guid":{"rendered":"http:\/\/local.brightwhiz\/?p=9541"},"modified":"2021-12-04T05:34:10","modified_gmt":"2021-12-04T05:34:10","slug":"change-elements-class-with-javascript","status":"publish","type":"post","link":"http:\/\/local.brightwhiz\/change-elements-class-with-javascript\/","title":{"rendered":"How can I Change an HTML Element&#8217;s Class With JavaScript or JQuery?"},"content":{"rendered":"\n<p>In this practical HTML guide, we will show you how to change an HTML element&#8217;s class using Vanilla <a href=\"http:\/\/local.brightwhiz\/tag\/javascript\">JavaScript<\/a> or JQuery with examples.<\/p>\n\n\n\n<p>Web browsers allow users to add or remove classes attached to an element in response to mouse clicks, taps, or any other event.<\/p>\n\n\n\n<p>The ability to change an <a href=\"http:\/\/local.brightwhiz\/tag\/html\">HTML<\/a> Element&#8217;s class is a very important function in making web pages more interactive and dynamic. You can use it to change the element&#8217;s appearance or even behavior.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Let&#8217;s See How to Change an Element&#8217;s Class<\/h2>\n\n\n\n<p>Modern browsers have a read-only property called <strong>classList<\/strong> that returns a live <strong>DOMTokenList<\/strong> collection of the class attributes of the element.<\/p>\n\n\n\n<p><strong>classList<\/strong> provides methods to conveniently add or remove classes as seen below:<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-javascript\">\/\/ add a class\ndocument.getElementById(&quot;ElementID&quot;).classList.add(&#039;MyClass&#039;);\n\n\/\/ remove a class\ndocument.getElementById(&quot;ElementID&quot;).classList.remove(&#039;MyClass&#039;);\n\n\/\/ toggle a class\ndocument.getElementById(&quot;ElementID&quot;).classList.toggle(&#039;MyClass&#039;);\n\n\/\/ check if class is present\nif ( document.getElementById(&quot;ElementID&quot;).classList.contains(&#039;MyClass&#039;) );<\/code><\/pre>\n\n\n\n<p><\/p>\n\n\n\n<p>The above will not work in versions less than Internet Explorer 10.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Using className<\/h2>\n\n\n\n<p>You can also use <strong>className<\/strong> to replace all existing classes with one or more new classes.<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-javascript\">\/\/ replaces all existing classes with MyClass\ndocument.getElementById(&quot;ElementID&quot;).className = &quot;MyClass&quot;;<\/code><\/pre>\n\n\n\n<p><\/p>\n\n\n\n<p>To preserve the existing classes while adding a new class to an element, use this:<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-javascript\">\/\/ Note the plus: (+=)\ndocument.getElementById(&quot;ElementID&quot;).className += &quot; MyClass&quot;;<\/code><\/pre>\n\n\n\n<p><\/p>\n\n\n\n<p><strong>Remove a Single Class From an Element Using className:<\/strong><\/p>\n\n\n\n<p>You can remove a single class from an element without affecting other classes if they exist using a regex replace seen below:<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-javascript\">document.getElementById(&quot;ElementID&quot;).className =\n   document.getElementById(&quot;ElementID&quot;).className.replace\n      ( \/(?:^|\\s)MyClass(?!\\S)\/g , &#039;&#039; );<\/code><\/pre>\n\n\n\n<p><\/p>\n\n\n\n<p><strong>Check if a Particular Class Exists:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-javascript\">if ( document.getElementById(&quot;#ElementID&quot;).className.match(\/(?:^|\\s)MyClass(?!\\S)\/) )<\/code><\/pre>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Change Element&#8217;s Class with jQuery<\/h2>\n\n\n\n<p>You can also use <a href=\"http:\/\/local.brightwhiz\/tag\/jquery\">JQuery<\/a>&#8216;s simpler syntax to change the classes in an HTML element in case you intend to use the library in your project.<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-javascript\">\/\/ add the class\n$(&#039;#ElementID&#039;).addClass(&#039;MyClass&#039;);\n\n\/\/ remove the class\n$(&#039;#ElementID&#039;).removeClass(&#039;MyClass&#039;);\n\n\/\/ toggle the class in or out\n$(&#039;#ElementID&#039;).toggleClass(&#039;MyClass&#039;);\n\n\/\/ check if the class exists\nif ( $(&#039;#ElementID&#039;).hasClass(&#039;MyClass&#039;) )<\/code><\/pre>\n\n\n\n<p><\/p>\n\n\n\n<p>There you have it. That is the way to change an element&#8217;s class in HTML using either vanilla JavaScript of the JQuery library.<\/p>\n\n\n\n<p>Ref: [<a href=\"https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/API\/Element\/classList\">1<\/a>], [<a href=\"https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/API\/Element\/className\" target=\"_blank\" rel=\"noreferrer noopener\">2<\/a>]<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In this practical HTML guide, we will show you how to change an HTML element&#8217;s class using Vanilla JavaScript or JQuery with examples. Web browsers allow users to add or&#8230;<\/p>\n","protected":false},"author":1,"featured_media":9542,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2,23,16],"tags":[303,320,328,333,600,635,637],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How can I Change an HTML Element&#039;s Class With JavaScript or JQuery?<\/title>\n<meta name=\"description\" content=\"In this practical HTML guide we will show you how to change an HTML element&#039;s class using Vanilla JavaScript or JQuery with examples\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"http:\/\/local.brightwhiz\/change-elements-class-with-javascript\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" 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