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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>JS classList Methods</title>
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<body>
<hr />
<h3>JS classList Methods</h3>
<p>
The classList property is used for representing the value of the class
elements which is a <strong>DOMTokenList</strong> object. It is
a read-only property but we can modify its value by manipulating the
classes used in the program. The JavaScript classList property consists of
following methods through which we can perform different operations on the
class elements:
</p>
<ul>
<li>
<strong>add():</strong> The add() method is used for adding one or
more classes to the element.
</li>
<li>
<strong>remove():</strong> The remove() method is used for removing
one or more classes from the number of classes present in the element.
</li>
<li>
<strong>toggle():</strong> The toggle() method is used for toggling
the specified class names of an element. It means on one click the
specified class gets added and on another click the class gets removed.
It is known as the toggle property of an element.
</li>
<li>
<strong>replace():</strong> The replace() method is used for
replacing an existing class with a new class.
</li>
<li>
<strong>contains():</strong> The contains() method of the
JavaScript classList property is used for returning the Boolean value as
an output. If the class is present, the value is returned as true
otherwise false is returned.
</li>
<li>
<strong>item():</strong> The item() method is used for displaying
the name of the classes at the particular index. Thus, it returns the
class name.
</li>
</ul>
<h3>html file</h3>
<pre
class="language-markup"
tabindex="0"
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<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>p</span><span class="token punctuation">></span></span>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Incidunt, veniam eius architecto ullam cupiditate quam aspernatur quis facilis tempora vel! Aspernatur, consequatur, laborum, explicabo consequuntur minima beatae perferendis impedit accusantium ex animi odit quisquam sint pariatur minus amet ullam reprehenderit rerum inventore sed officiis voluptas? Dolore, perferendis, minus eum debitis vero ipsam tempora voluptate nam ut autem itaque provident consequatur nobis quia libero! Magni, molestiae, laborum architecto natus inventore facere quis pariatur quia quos quasi quo dicta dolores. Deleniti, facere, fugit sed minus ducimus ut modi voluptatum eaque praesentium saepe aperiam nam quidem laboriosam assumenda voluptate vitae inventore et quibusdam!<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>p</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>ul</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>list<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>li</span><span class="token punctuation">></span></span>Lorem ipsum dolor sit amet. <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>li</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>li</span><span class="token punctuation">></span></span>Modi nihil in animi necessitatibus.<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>li</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>li</span><span class="token punctuation">></span></span>Consectetur adipisicing elit.<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>li</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>li</span><span class="token punctuation">></span></span>Lorem ipsum dolor sit amet.<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>li</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>li</span><span class="token punctuation">></span></span>Modi nihil in animi dolore natus.<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>li</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>ul</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>p</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>list<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Ipsa, quam.<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>p</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>div</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>div</span> <span class="token attr-name">id</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>sidebar<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>ul</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>li</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>a</span> <span class="token attr-name">href</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span><span class="token punctuation">"</span></span><span class="token punctuation">></span></span>Home<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>a</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>li</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>li</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>a</span> <span class="token attr-name">href</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span><span class="token punctuation">"</span></span><span class="token punctuation">></span></span>About Us<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>a</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>li</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>li</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>a</span> <span class="token attr-name">href</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span><span class="token punctuation">"</span></span><span class="token punctuation">></span></span>Gallery<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>a</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>li</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>li</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>a</span> <span class="token attr-name">href</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span><span class="token punctuation">"</span></span><span class="token punctuation">></span></span>Contact Us<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>a</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>li</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>ul</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>div</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>div</span> <span class="token attr-name">id</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>footer<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
yahoobaba@copyright 2018.
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>div</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>div</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>script</span> <span class="token attr-name">src</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>js/dom-main.js<span class="token punctuation">"</span></span><span class="token punctuation">></span></span><span class="token script"></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>script</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>body</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>html</span><span class="token punctuation">></span></span>
</code></pre>
<hr />
<h3>main.css</h3>
<pre
class="language-css"
tabindex="0"
><code class="language-css"><span class="token atrule"><span class="token rule">@import</span> <span class="token string">"color.css"</span><span class="token punctuation">;</span></span>
<span class="token selector">*</span><span class="token punctuation">{</span>
<span class="token property">box-sizing</span><span class="token punctuation">:</span> border-box<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token selector">body</span><span class="token punctuation">{</span>
<span class="token property">font</span><span class="token punctuation">:</span> 18px/24px arial<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token selector">#wrapper</span><span class="token punctuation">{</span>
<span class="token property">border</span><span class="token punctuation">:</span>1px solid black<span class="token punctuation">;</span>
<span class="token property">width</span><span class="token punctuation">:</span> 1000px<span class="token punctuation">;</span>
<span class="token property">background</span><span class="token punctuation">:</span> white<span class="token punctuation">;</span>
<span class="token property">margin</span><span class="token punctuation">:</span> 0 auto<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token selector">#top-bar</span><span class="token punctuation">{</span>
<span class="token property">background</span><span class="token punctuation">:</span> MEDIUMPURPLE<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token selector">#top-bar ul</span><span class="token punctuation">{</span>
<span class="token property">margin</span><span class="token punctuation">:</span> 0<span class="token punctuation">;</span>
<span class="token property">padding</span><span class="token punctuation">:</span> 0<span class="token punctuation">;</span>
<span class="token property">list-style</span><span class="token punctuation">:</span> none<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token selector">#top-bar ul li</span><span class="token punctuation">{</span>
<span class="token property">display</span><span class="token punctuation">:</span> inline-block<span class="token punctuation">;</span>
<span class="token property">margin</span><span class="token punctuation">:</span> 5px<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token selector">#top-bar a</span><span class="token punctuation">{</span>
<span class="token property">color</span><span class="token punctuation">:</span> #fff<span class="token punctuation">;</span>
<span class="token property">font-size</span><span class="token punctuation">:</span> 20px<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token selector">#top-bar a:hover</span><span class="token punctuation">{</span>
<span class="token property">color</span><span class="token punctuation">:</span> crimson<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token selector">#header</span><span class="token punctuation">{</span>
<span class="token property">min-height</span><span class="token punctuation">:</span> 100px<span class="token punctuation">;</span>
<span class="token property">font-family</span><span class="token punctuation">:</span> arial<span class="token punctuation">;</span>
<span class="token property">border-bottom</span><span class="token punctuation">:</span> 1px solid black<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token selector">#header h1</span><span class="token punctuation">{</span>
<span class="token property">padding</span><span class="token punctuation">:</span>30px 0 0 20px<span class="token punctuation">;</span>
<span class="token property">margin</span><span class="token punctuation">:</span> 0<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token selector">#menu</span><span class="token punctuation">{</span>
<span class="token property">border-bottom</span><span class="token punctuation">:</span> 1px solid black<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token selector">#menu ul</span><span class="token punctuation">{</span>
<span class="token property">margin</span><span class="token punctuation">:</span> 0<span class="token punctuation">;</span>
<span class="token property">padding</span><span class="token punctuation">:</span> 0<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token selector">#menu li</span><span class="token punctuation">{</span>
<span class="token property">display</span><span class="token punctuation">:</span>inline-block<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token selector">#menu li a</span><span class="token punctuation">{</span>
<span class="token property">display</span><span class="token punctuation">:</span>block<span class="token punctuation">;</span>
<span class="token property">padding</span><span class="token punctuation">:</span> 10px 13px<span class="token punctuation">;</span>
<span class="token property">text-decoration</span><span class="token punctuation">:</span>none<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token selector">#menu li a:hover</span><span class="token punctuation">{</span>
<span class="token punctuation">}</span>
<span class="token selector">#content</span><span class="token punctuation">{</span>
<span class="token property">width</span><span class="token punctuation">:</span>795px<span class="token punctuation">;</span>
<span class="token property">min-height</span><span class="token punctuation">:</span>500px<span class="token punctuation">;</span>
<span class="token property">padding</span><span class="token punctuation">:</span> 15px<span class="token punctuation">;</span>
<span class="token property">float</span><span class="token punctuation">:</span>left<span class="token punctuation">;</span>
<span class="token property">box-sizing</span><span class="token punctuation">:</span>border-box<span class="token punctuation">;</span>
<span class="token property">position</span><span class="token punctuation">:</span>relative<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token selector">#content h2</span><span class="token punctuation">{</span>
<span class="token property">font-family</span><span class="token punctuation">:</span> arial<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token selector">.content-image</span><span class="token punctuation">{</span>
<span class="token property">float</span><span class="token punctuation">:</span>left<span class="token punctuation">;</span><span class="token property">margin</span><span class="token punctuation">:</span>0 15px 10px 0<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token selector">#sidebar</span><span class="token punctuation">{</span>
<span class="token property">width</span><span class="token punctuation">:</span>200px<span class="token punctuation">;</span>
<span class="token property">min-height</span><span class="token punctuation">:</span>500px<span class="token punctuation">;</span>
<span class="token property">float</span><span class="token punctuation">:</span>right<span class="token punctuation">;</span>
<span class="token property">border-left</span><span class="token punctuation">:</span> 1px solid black<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token selector">#sidebar a</span><span class="token punctuation">{</span>
<span class="token property">text-decoration</span><span class="token punctuation">:</span>none<span class="token punctuation">;</span>
<span class="token property">color</span><span class="token punctuation">:</span>black<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token selector">#footer</span><span class="token punctuation">{</span>
<span class="token property">padding</span><span class="token punctuation">:</span> 5px 10px<span class="token punctuation">;</span>
<span class="token property">text-align</span><span class="token punctuation">:</span>right<span class="token punctuation">;</span>
<span class="token property">font-size</span><span class="token punctuation">:</span> 14px<span class="token punctuation">;</span>
<span class="token property">clear</span><span class="token punctuation">:</span>both<span class="token punctuation">;</span>
<span class="token property">border-top</span><span class="token punctuation">:</span> 1px solid black<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token atrule"><span class="token rule">@import</span> <span class="token string">"mediatest.css"</span> screen <span class="token keyword">and</span> <span class="token punctuation">(</span><span class="token property">max-width</span><span class="token punctuation">:</span>1020px<span class="token punctuation">)</span><span class="token punctuation">;</span></span>
<span class="token atrule"><span class="token rule">@media</span> screen <span class="token keyword">and</span> <span class="token punctuation">(</span><span class="token property">max-width</span><span class="token punctuation">:</span>810px<span class="token punctuation">)</span></span><span class="token punctuation">{</span>
<span class="token selector">#wrapper</span><span class="token punctuation">{</span>
<span class="token property">width</span><span class="token punctuation">:</span>500px<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token selector">#content</span><span class="token punctuation">{</span>
<span class="token property">width</span><span class="token punctuation">:</span>65%<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token selector">#sidebar</span><span class="token punctuation">{</span>
<span class="token property">width</span><span class="token punctuation">:</span>34%
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token atrule"><span class="token rule">@media</span> screen <span class="token keyword">and</span> <span class="token punctuation">(</span><span class="token property">max-width</span><span class="token punctuation">:</span>510px<span class="token punctuation">)</span></span><span class="token punctuation">{</span>
<span class="token selector">#wrapper</span><span class="token punctuation">{</span>
<span class="token property">width</span><span class="token punctuation">:</span>auto<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token selector">#content</span><span class="token punctuation">{</span>
<span class="token property">width</span><span class="token punctuation">:</span>100%<span class="token punctuation">;</span>
<span class="token property">float</span><span class="token punctuation">:</span>none<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token selector">#sidebar</span><span class="token punctuation">{</span>
<span class="token property">width</span><span class="token punctuation">:</span>100%<span class="token punctuation">;</span>
<span class="token property">float</span><span class="token punctuation">:</span>none<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token selector">#header h1</span><span class="token punctuation">{</span>
<span class="token property">padding</span><span class="token punctuation">:</span>30px 0 0 0<span class="token punctuation">;</span>
<span class="token property">text-align</span><span class="token punctuation">:</span>center<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<hr />
<h3>< dom-main.js</h3>
<pre
class="language-javascript"
tabindex="0"
><code class="language-javascript">document<span class="token punctuation">.</span><span class="token function">getElementById</span><span class="token punctuation">(</span><span class="token string">"header"</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">addEventListener</span><span class="token punctuation">(</span><span class="token string">"click"</span><span class="token punctuation">,</span> abc<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">function</span> <span class="token function">abc</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token comment">//document.getElementById("header").classList.add("xyz","efg");</span>
<span class="token comment">//document.getElementById("header").classList.remove("xyz");</span>
<span class="token comment">//var a = document.getElementById("header").classList.length;</span>
<span class="token comment">//document.getElementById("header").classList.toggle("xyz");</span>
<span class="token comment">//var a = document.getElementById("header").classList;</span>
<span class="token comment">//var a = document.getElementById("header").classList.item(0);</span>
<span class="token keyword">var</span> a <span class="token operator">=</span> document<span class="token punctuation">.</span><span class="token function">getElementById</span><span class="token punctuation">(</span><span class="token string">"header"</span><span class="token punctuation">)</span><span class="token punctuation">.</span>classList<span class="token punctuation">.</span><span class="token function">contains</span><span class="token punctuation">(</span><span class="token string">"first"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>a<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span></code></pre>
<hr />
<div id="wrapper">
<div id="header" class="abc">
<h1>Yahoo Baba</h1>
</div>
<div id="menu">
<ul>
<li><a href="">Home</a></li>
<li><a href="">About Us</a></li>
<li><a href="">Gallery</a></li>
<li><a href="">Contact Us</a></li>
</ul>
</div>
<div id="content">
<h2>Sub Heading</h2>
<img
src="images/flower.jpg"
width="200px"
class="content-image"
alt=""
/>
<p>
Lorem ipsum dolor sit amet, consectetur adipisicing elit. Incidunt,
veniam eius architecto ullam cupiditate quam aspernatur quis facilis
tempora vel! Aspernatur, consequatur, laborum, explicabo consequuntur
minima beatae perferendis impedit accusantium ex animi odit quisquam
sint pariatur minus amet ullam reprehenderit rerum inventore sed
officiis voluptas? Dolore, perferendis, minus eum debitis vero ipsam
tempora voluptate nam ut autem itaque provident consequatur nobis quia
libero! Magni, molestiae, laborum architecto natus inventore facere
quis pariatur quia quos quasi quo dicta dolores. Deleniti, facere,
fugit sed minus ducimus ut modi voluptatum eaque praesentium saepe
aperiam nam quidem laboriosam assumenda voluptate vitae inventore et
quibusdam!
</p>
<ul class="list">
<li>Lorem ipsum dolor sit amet.</li>
<li>Modi nihil in animi necessitatibus.</li>
<li>Consectetur adipisicing elit.</li>
<li>Lorem ipsum dolor sit amet.</li>
<li>Modi nihil in animi dolore natus.</li>
</ul>
<p class="list">
Lorem ipsum dolor sit amet, consectetur adipisicing elit. Ipsa, quam.
</p>
</div>
<div id="sidebar" class="xyz">
<ul>
<li><a href="">Home</a></li>
<li><a href="">About Us</a></li>
<li><a href="">Gallery</a></li>
<li><a href="">Contact Us</a></li>
</ul>
</div>
<div id="footer">yahoobaba@copyright 2018.</div>
</div>
</body>
<script>
let first_var = document.querySelector("#header");
first_var.addEventListener("click", function () {
first_var.classList.add("xyz");
});
let second_var = document.querySelector("#sidebar");
second_var.addEventListener("click", function () {
second_var.classList.toggle("xyz");
});
</script>
</html>