Laravel 5 Basics (4) - Introduction to Blade-PHP Tutorial-php.cn

Laravel 5 Basics (4) - Introduction to Blade

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Release： 2016-08-08 09:26:55

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We may include the same content in multiple pages, such as file headers, linked css or js, etc. We can use layout files to accomplish this function.

Let’s create a new layout file, for example views/layout.blade.php

<code><!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <link rel="stylesheet" href="http://cdn.bootcss.com/bootstrap/3.3.4/css/bootstrap.min.css">
</head>
<body>
    <div class="container">
        @yield('content')
    </div>
</body>
</html></code>

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We created an incomprehensible structure and introduced bootstrap. Note that @yield is the layout placeholder of blade. Our page content will be filled here in the future. Modify about.blade.php

<code>@extends('layout')

@section('content')
    
<h1>About {{ $first }} {{ $last }}</h1>

@stop</code>

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The above code means that we use the layout file layout.blade.php, and then add content in the content section.

Add in routes.php:

<code>Route::get('about', 'PagesController@about');
Route::get('contact', 'PagesController@contact');</code>

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Add in PagesController.php:

<code>    public function contact() {
        return view('pages.contact');
    }</code>

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New view pages/contact.blade.php

<code>@extends('layout')

@section('content')
    <h1>Contact Me!</h1>
@stop</code>

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Check it out!

We can add multiple @yield in the layout file, such as adding @yield('footer') in layout.blade.php:

<code><!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <link rel="stylesheet" href="http://cdn.bootcss.com/bootstrap/3.3.4/css/bootstrap.min.css">
</head>
<body>
    <div class="container">
        @yield('content')
    </div>

    @yield('footer')
</body>
</html></code>

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For example, if there is a script in contact.blade.php, it can be placed in this section.

<code>@extends('layout')

@section('content')
    <h1>Contact Me!</h1>
@stop

@section('footer')
    <script>
        alert('Contact from scritp')
    </script>
@stop</code>

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There will be a dialog box when accessing contact, but about is still displayed normally

Use @if to judge

<code>@extends('layout')

@section('content')
    @if ($first = 'Zhang')
        <h1>Hello, Zhang</h1>
    @else
        <h1>Hello, nobody</h1>
    @endif
@stop</code>

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can also be regarded as @unless equivalent to if !, and @foreach etc.

<code>    public function about()
    {
        $people = [
            'zhang san',
            'li si',
            'wang wu'
        ];
        return view('pages.about', compact('people'));
    }</code>

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<code>@extends('layout')

@section('content')
    <h1>Person:</h1>
    <ul>
        @foreach($people as $person)
            <li>{{ $person }}</li>
        @endforeach
    </ul>
@stop</code>

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There is a situation where the data may come from the database and the collection may be empty, like this:

<code>$people = [];</code>

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To handle this situation, please add @if handle

<code>@extends('layout')

@section('content')
    @if (count($people))
        <h1>Person:</h1>
        <ul>
            @foreach($people as $person)
                <li>{{ $person }}</li>
            @endforeach
        </ul>
    @endif

    <h2>Other info</h2>
@stop</code>

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That's better.

The above introduces the basics of Laravel 5 (4) - Introduction to Blade, including various aspects. I hope it will be helpful to friends who are interested in PHP tutorials.