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laravel-blade-parent.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta name="description" content="Dino Lai Software Blogs include Notes, Records and Resources">
<meta name="keywords" content="Programming,System,Coding,Software Develop">
<meta name="author" content="Dino Lai">
<title>Laravel - 設計一個好的 Blade Template, 使用 @parent - Dinote</title>
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aria-controls="navbar">
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<article class="markdown-body">
<header>Updated: 2017-04-13 18:52:38 CST +08</header>
<main>
<h1 id="laravel-設計一個好的-blade-template-使用-parent">Laravel - 設計一個好的 Blade Template, 使用 @parent</h1>
<p>做網站的都知道，一個 HTML 最佳的讀取順序應該是</p>
<ol>
<li>meta tag</li>
<li>css</li>
<li>body</li>
<li>js</li>
</ol>
<p>在 Laravel 裡我們會把版面都用到的地方切成 layout 出來，如 基本的 HTML Tag, Meta Tag, CSS, Javascript 等等，而因為 js 要給子頁面用，所以都會把 js 移到上面來。</p>
<pre><code class="language-html"><!-- layout.blade.php -->
<!DOCTYPE html>
<html>
<head>
<title>Laravel 5 Example - @yield('title')</title>
<meta charset="utf-8">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>
</head>
<body>
<header>
</header>
<nav>
</nav>
<section>
@yield('content')
</section>
<footer>
</footer>
</body>
</html>
</code></pre>
<p>而子頁面會這樣寫。</p>
<pre><code class="language-html"><!-- index.blade.php -->
@extends('layout')
@section('title', 'index')
@section('content')
<style>
div {
text-align: center;
}
</style>
<div>
Home Page
</div>
<script>
$(function() {
});
</script>
@endsection
</code></pre>
<p>但這樣會讓 Laravel 在產生 view 時，css 與 js 在 section 區塊裡面出現，如果頁面又 include 一些區塊 blade 的話，整個產生的 HTML 會變得很糟很難看，body 裡面 html tag, css, js 此起彼落的出現，不僅難看也影響效能。</p>
<p>這時我們可以擅用 @parent 來讓子頁面的 css 與 js 在我們想要的父區塊裡面，又能有 layout 裡那些我們共用的 css, js，完成我們的最佳實踐。(這邊就跟 OOP 裡，子類別可以在 function 裡加上 parent::functionName(); 一樣。)</p>
<pre><code class="language-html"><!-- layout.blade.php -->
<!DOCTYPE html>
<html>
<head>
<title>Laravel 5 Example - @yield('title')</title>
<meta charset="utf-8">
@section('style')
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">
@show
</head>
<body>
<header>
</header>
<nav>
</nav>
<section>
@yield('content')
</section>
<footer>
</footer>
@section('script')
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>
@show
</body>
</html>
</code></pre>
<p>內頁加上 style 和 script section，並用 @parent 讓父類別 section 裡的東西繼承下來，而不去覆寫它。</p>
<pre><code class="language-html"><!-- index.blade.php -->
@extends('layout')
@section('title', 'index')
@section('style')
@parent
<style>
div {
text-align: center;
}
</style>
@endsection
@section('content')
<div>
Home Page
</div>
@endsection
@section('script')
@parent
<script>
$(function() {
});
</script>
@endsection
</code></pre>
<p>這樣產生的 view 就會是按我們想要的順序出來囉！</p>
<pre><code class="language-html"><!DOCTYPE html>
<html>
<head>
<title>Laravel 5 Example - index</title>
<meta charset="utf-8">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">
<style>
div {
text-align: center;
}
</style>
</head>
<body>
<header>
</header>
<nav>
</nav>
<section>
<div>
Home Page
</div>
</section>
<footer>
</footer>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>
<script>
$(function() {
});
</script>
</body>
</html>
</code></pre>
<h2 id="ps">PS</h2>
<p>在官網 @parent 的例子是用 sidebar，可能是沒有立即有感，發現不多人記得有這個東西，所以寫了這篇來提示一下大家可以這樣用。</p>
<h2 id="reference">Reference</h2>
<ul>
<li><a href="http://laravel.com/docs/5.1/blade">Blade Templates - Laravel</a></li>
</ul>
<gcse:searchresults-only></gcse:searchresults-only>
</main>
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