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JS-firstChild-&-lastChild-Method.html
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JS-firstChild-&-lastChild-Method.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 firstChild & lastChild Method</title>
<style>
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code[class*="language-"],
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color: black;
background: none;
background-color: rgba(0, 0, 0, 0);
font-family: Consolas, Monaco, "Andale Mono", "Ubuntu Mono", monospace;
font-size: 1em;
text-align: left;
white-space: pre;
word-spacing: normal;
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</style>
</head>
<body>
<hr />
<h3>firstChild:</h3>
<p>
The <code>firstChild</code> property returns the first child
node of a node.
</p>
<p>The <code>firstChild</code> property returns a node object.</p>
<p>The <code>firstChild</code> property is read-only.</p>
<p>
The <code>firstChild</code> property is the same
as <code>childNodes[0]</code>.
</p>
<h3>lastChild:</h3>
<p>
The <code>lastChild</code> property returns the last child node
of a node.
</p>
<p>
The <code>lastChild</code> property returns returns a node
object.
</p>
<p>The <code>lastChild</code> property is read-only.</p>
<h3>html file</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 attr-name">id</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>main<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>title</span><span class="token punctuation">></span></span>DOM Navigation<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>head</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> 550px<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">padding</span><span class="token punctuation">:</span>10px 10px<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> 500px<span class="token punctuation">;</span>
<span class="token property">height</span><span class="token punctuation">:</span> 200px<span class="token punctuation">;</span>
<span class="token property">padding</span><span class="token punctuation">:</span>10px 10px<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> mediumorchid<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token selector">#inner div</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">background</span><span class="token punctuation">:</span> #fff<span class="token punctuation">;</span>
<span class="token property">width</span><span class="token punctuation">:</span> 95px<span class="token punctuation">;</span>
<span class="token property">height</span><span class="token punctuation">:</span> 50px<span class="token punctuation">;</span>
<span class="token property">line-height</span><span class="token punctuation">:</span> 50px<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></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>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>A<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>B<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>child-c<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>C<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>D<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>E<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>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-nav.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 />
dom-nav.js
</h3>
<pre
class="language-javascript"
tabindex="0"
><code class="language-javascript"><span class="token comment">//var a = document.getElementById("inner").firstElementChild;</span>
<span class="token comment">//var a = document.getElementById("inner").firstElementChild.innerHTML;</span>
<span class="token comment">/* document.getElementById("inner").firstElementChild.style.background = "red";
var a = document.getElementById("inner").firstElementChild.innerHTML; */</span>
<span class="token comment">/* document.getElementById("outer").lastElementChild.style.background = "red";
var a = document.getElementById("outer").lastElementChild; */</span>
<span class="token comment">/* document.getElementById("inner").lastElementChild.style.background = "red";
var a = document.getElementById("inner").lastElementChild; */</span>
<span class="token comment">//var a = document.getElementById("inner").firstChild; </span>
<span class="token comment">//var a = document.getElementById("inner").lastChild; </span>
<span class="token comment">//var a = document.getElementById("child-c").firstChild; </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">"child-c"</span><span class="token punctuation">)</span><span class="token punctuation">.</span>lastChild<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></code></pre>
<hr />
</body>
</html>