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<!DOCTYPE html>
<html lang="en">
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<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>JS addEventListener Method</title>
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<body>
<h1>JS addEventListener Method</h1>
<hr />
<h3>
<br />
JS addEventListener Method
</h3>
<p>
The <strong>addEventListener()</strong> method is used to attach
an event handler to a particular element. It does not override the
existing event handlers. Events are said to be an essential part of the
JavaScript. A web page responds according to the event that occurred.
Events can be user-generated or generated by API's. An event listener is a
JavaScript's procedure that waits for the occurrence of an event.
</p>
<p>
The addEventListener() method is an inbuilt function of . We can add
multiple event handlers to a particular element without overwriting the
existing event handlers.
</p>
<h3>Syntax:</h3>
<pre
class="language-javascript"
tabindex="0"
><code class="language-javascript">element<span class="token punctuation">.</span><span class="token function">addEventListener</span><span class="token punctuation">(</span>event<span class="token punctuation">,</span> <span class="token keyword">function</span><span class="token punctuation">,</span> useCapture<span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre>
<br />
Although it has three parameters, the parameters <strong
><em>event</em></strong
> and <strong><em>function</em></strong
> are widely used. The third parameter is optional to define. The
values of this function are defined as follows.
<h3>Parameter Values</h3>
<p>
<strong>event:</strong> It is a required parameter. It can be defined
as a string that specifies the event's name.<br />
<br />
<strong>function:</strong> It is also a required parameter. It is
a JavaScript function which responds to the event occur.<br />
<br />
<strong>useCapture:</strong> It is an optional parameter. It is a
Boolean type value that specifies whether the event is executed in the
bubbling or capturing phase. Its possible values
are <strong>true</strong> and <strong>false</strong>. When
it is set to true, the event handler executes in the capturing phase. When
it is set to false, the handler executes in the bubbling phase. Its
default value is <strong>false</strong>.
</p>
<h3>html file for add event listener and remove event listener</h3>
<pre
class="language-markup"
tabindex="0"
><code class="language-markup"><span class="token doctype"><span class="token punctuation"><!</span><span class="token doctype-tag">DOCTYPE</span> <span class="token name">html</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>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>head</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>title</span><span class="token punctuation">></span></span>Basic Layout<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>title</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>link</span> <span class="token attr-name">rel</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>stylesheet<span class="token punctuation">"</span></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>css/main.css<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>head</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>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>wrapper<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>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>header<span class="token punctuation">"</span></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>abc<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>h1</span><span class="token punctuation">></span></span>Yahoo Baba<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>h1</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>menu<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>content<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>h2</span><span class="token punctuation">></span></span>Sub Heading<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>h2</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>img</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>images/flower.jpg<span class="token punctuation">"</span></span> <span class="token attr-name">width</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>200px<span class="token punctuation">"</span></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>content-image<span class="token punctuation">"</span></span> <span class="token attr-name">alt</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>
<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>
<h3>
<br />
main.css for add event listener and remove event listener
</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>
<h3>
<br />
dom-main.js for add event listner and remove event listener
</h3>
<pre
class="language-javascript"
tabindex="0"
><code class="language-javascript"><span class="token comment">// onclick event</span>
<span class="token comment">//document.getElementById("header").onclick = abc;</span>
<span class="token comment">// onmouseenter event</span>
<span class="token comment">//document.getElementById("header").onmouseenter = abc;</span>
<span class="token comment">// with addEventListener</span>
<span class="token comment">/* document.getElementById("header").addEventListener("mouseenter",abc);
document.getElementById("header").addEventListener("click", function(){
document.getElementById("header").style.border = "10px solid red";
}); */</span>
<span class="token comment">/* document.getElementById("header").addEventListener("click", abc);
document.getElementById("header").addEventListener("click", function() {
this.style.border = "10px solid red";
}); */</span>
<span class="token comment">// with removeEventListener</span>
<span class="token comment">//document.getElementById("header").removeEventListener('mouseleave',abc);</span>
<span class="token comment">//document.getElementById("header").addEventListener("click",xyz);</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>
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>style<span class="token punctuation">.</span>background <span class="token operator">=</span> <span class="token string">"green"</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">function</span> <span class="token function">xyz</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</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><span class="token function">removeEventListener</span><span class="token punctuation">(</span><span class="token string">'mouseleave'</span><span class="token punctuation">,</span>abc<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token comment">/* ====================================================== */</span></code></pre>
<h3>
<br />
html for usecapture
</h3>
<pre
class="language-markup"
tabindex="0"
><code class="language-markup"><span class="token doctype"><span class="token punctuation"><!</span><span class="token doctype-tag">DOCTYPE</span> <span class="token name">html</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>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>head</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>title</span><span class="token punctuation">></span></span>Basic Layout<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>title</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>style</span><span class="token punctuation">></span></span><span class="token style"><span class="token language-css">
<span class="token selector">#outer</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 property">height</span><span class="token punctuation">:</span> 500px<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 property">background</span><span class="token punctuation">:</span> LIGHTSALMON<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token selector">#inner</span><span class="token punctuation">{</span>
<span class="token property">width</span><span class="token punctuation">:</span> 300px<span class="token punctuation">;</span>
<span class="token property">height</span><span class="token punctuation">:</span> 300px<span class="token punctuation">;</span>
<span class="token property">margin</span><span class="token punctuation">:</span> 100px auto 0<span class="token punctuation">;</span>
<span class="token property">background</span><span class="token punctuation">:</span> MEDIUMORCHID<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>style</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>head</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>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>outer<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>h2</span><span class="token punctuation">></span></span>Outer<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>h2</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>inner<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>h2</span><span class="token punctuation">></span></span>Inner<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>h2</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 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/usecapture.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>
<h3>
<br />
usecapture.js
</h3>
<pre
class="language-javascript"
tabindex="0"
><code class="language-javascript">document<span class="token punctuation">.</span><span class="token function">querySelector</span><span class="token punctuation">(</span><span class="token string">"#inner"</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><span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
<span class="token function">alert</span><span class="token punctuation">(</span><span class="token string">'Inner Div'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">,</span><span class="token boolean">false</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
document<span class="token punctuation">.</span><span class="token function">querySelector</span><span class="token punctuation">(</span><span class="token string">"#outer"</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><span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
<span class="token function">alert</span><span class="token punctuation">(</span><span class="token string">'Outer Div'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">,</span><span class="token boolean">false</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre>
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