JS-Children-Methods.html

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  <body>
    <hr />
    <h3>JS Children Methods</h3>

    <p>
      The&nbsp;<code>children</code>&nbsp;property returns a collection of an
      element's child elements.
    </p>

    <p>
      The&nbsp;<code>children</code>&nbsp;property returns
      an&nbsp;HTMLCollection&nbsp;object.<br />
      &nbsp;
    </p>

    <h3>childNodes:</h3>

    <p>
      The&nbsp;<code>childNodes</code>&nbsp;property returns a collection (list)
      of an elements's child nodes.
    </p>

    <p>
      The&nbsp;<code>childNodes</code>&nbsp;property returns
      a&nbsp;NodeList&nbsp;object.
    </p>

    <p>The&nbsp;<code>childNodes</code>&nbsp;property is read-only.</p>

    <p>
      <code>childNodes[0]</code>&nbsp;is the same
      as&nbsp;<code>firstChild</code>.
    </p>

    <h3>html file</h3>

    <pre
      class="language-markup"
      tabindex="0"
    ><code class="language-markup"><span class="token doctype"><span class="token punctuation">&lt;!</span><span class="token doctype-tag">DOCTYPE</span> <span class="token name">html</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</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">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>head</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>title</span><span class="token punctuation">&gt;</span></span>Basic Layout<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>title</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>head</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>style</span><span class="token punctuation">&gt;</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">&lt;/</span>style</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>body</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</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">&gt;</span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>h2</span><span class="token punctuation">&gt;</span></span>Outer<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>h2</span><span class="token punctuation">&gt;</span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</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">&gt;</span></span>
            <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>h2</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-head<span class="token punctuation">"</span></span><span class="token punctuation">&gt;</span></span>Inner<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>h2</span><span class="token punctuation">&gt;</span></span>
            <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span><span class="token punctuation">&gt;</span></span>A<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">&gt;</span></span>
            <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span><span class="token punctuation">&gt;</span></span>B<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">&gt;</span></span>
            <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</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">&gt;</span></span>C<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">&gt;</span></span>
            <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span><span class="token punctuation">&gt;</span></span>D<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">&gt;</span></span>
            <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</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-E<span class="token punctuation">"</span></span><span class="token punctuation">&gt;</span></span>E<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">&gt;</span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</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">&gt;</span></span><span class="token script"></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>script</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>body</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>html</span><span class="token punctuation">&gt;</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("outer").children;</span>

<span class="token comment">//var a = document.getElementById("inner").children;</span>

<span class="token comment">//var a = document.getElementById("inner").children[1];</span>

<span class="token comment">/* document.getElementById("inner").children[1].style.background = "red";
var a = document.getElementById("inner").children[1]; */</span>

<span class="token comment">/* document.getElementById("inner").children[0].style.background = "red";
var a = document.getElementById("inner").children[0].innerHTML; */</span>

<span class="token comment">//var a = document.getElementById("inner").childNodes;</span>

<span class="token comment">//var a = document.getElementById("inner").childNodes[0].innerHTML;</span>

document<span class="token punctuation">.</span><span class="token function">getElementById</span><span class="token punctuation">(</span><span class="token string">"inner"</span><span class="token punctuation">)</span><span class="token punctuation">.</span>childNodes<span class="token punctuation">[</span><span class="token number">3</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">"red"</span><span class="token punctuation">;</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">"inner"</span><span class="token punctuation">)</span><span class="token punctuation">.</span>childNodes<span class="token punctuation">[</span><span class="token number">3</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></code></pre>

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