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JS-DOM-querySelectors.html
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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 DOM querySelectors</title>
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<body>
<hr />
<h3>JS DOM querySelectors</h3>
<p>
The querySelector() method returns the first child element that matches a
specified <em>CSS selector(s)</em> of an element.
</p>
<p>
<strong>Note:</strong> The querySelector() method only returns the
first element that matches the specified selectors. To return all the
matches, use the querySelectorAll() method instead.
</p>
<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>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
</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>dom-main.js</h3>
<pre
class="language-javascript"
tabindex="0"
><code class="language-javascript"><span class="token keyword">var</span> element<span class="token punctuation">;</span>
<span class="token comment">//element = document.querySelector("#header").innerHTML = "<h1>WOW</h1>";</span>
<span class="token comment">//element = document.querySelector("#header").getAttribute ("class");</span>
<span class="token comment">//element = document.querySelectorAll(".list");</span>
element <span class="token operator">=</span> document<span class="token punctuation">.</span><span class="token function">querySelectorAll</span><span class="token punctuation">(</span><span class="token string">".list"</span><span class="token punctuation">)</span><span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">]</span><span class="token punctuation">.</span>innerHTML<span class="token punctuation">;</span>
element <span class="token operator">=</span> document<span class="token punctuation">.</span><span class="token function">querySelectorAll</span><span class="token punctuation">(</span><span class="token string">"ul"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
element <span class="token operator">=</span> document<span class="token punctuation">.</span><span class="token function">querySelectorAll</span><span class="token punctuation">(</span><span class="token string">"ul"</span><span class="token punctuation">)</span><span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">]</span><span class="token punctuation">.</span>innerHTML<span class="token punctuation">;</span>
element <span class="token operator">=</span> document<span class="token punctuation">.</span><span class="token function">querySelectorAll</span><span class="token punctuation">(</span><span class="token string">"#header h1"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
element <span class="token operator">=</span> document<span class="token punctuation">.</span><span class="token function">querySelectorAll</span><span class="token punctuation">(</span><span class="token string">"#header h1"</span><span class="token punctuation">)</span><span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">]</span><span class="token punctuation">.</span>innerHTML<span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>element<span class="token punctuation">)</span><span class="token punctuation">;</span></code></pre>
<hr />
<div id="wrapper">
<div id="header" class="abc" style="border: 10px solid yellow">
<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" class="abc" style="border: 1px solid red" onclick="abv">
<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">
<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" style="border: #212529">
hamzakhanlodhi @copyright 2023.
</div>
</div>
</body>
</html>