laravel blade, how to append to a section

2019-02-11 12:34发布

站内问答 / PHP
1410 3 5

If you look to laravel official documentation http://laravel.com/docs/4.2/templates It says that giving this layout: 

<!-- Stored in app/views/layouts/master.blade.php -->

<html>
    <body>
        @section('sidebar')
            This is the master sidebar.
        @show

        <div class="container">
            @yield('content')
        </div>
    </body>
</html>

Extended by this view 

@extends('layouts.master')

@section('sidebar')


    <p>This is appended to the master sidebar.</p>
@stop

@section('content')
    <p>This is my body content.</p>
@stop

Will append to the section sidebar. But actually if you try is it doesn't append, it just override the content from the extended template.

I heard about others blade function like @append, @prepend, @parent... no one seems to work.

Beside, this example in the official doc which doesn't work, I find that the blade documentation is very poor. There's nothing about blade function like @parent for instance.

3条回答
趁早两清
2楼-- · 2019-02-11 12:48

as mentioned before, I used @parent and it works fine for me. May be an example for extended title will helps:

master.blade.php

@section('title')
My Blog 
@stop
<!doctype html>
<html>
<head>
    @include('includes.head')
</head>
<body>
<div class="container-fluid">
    <div id="main" class="row">
            @yield('content')
    </div>
</div>
</body>
</html>

includes/head.blade.php

<meta charset="utf-8">
<title>@yield('title')</title>

post.blade.php

@extends('master')

@section('title')
@parent
| {{$post->title }}
@stop
@section('content')
// Post Body here ..
@stop

Therefore, The Title will be rendered to be like this:

My Blog | My Post Title

Actually, this will render something like:

<title>
    My Blog
    | My Post Title
</title>

so you can use the section second parameter to set the values:

includes/head.blade.php

...
@section('title', 'My Blog')
...

post.blade.php

...
@section('title', '@parent | ' . $post->ar_name )
...

And this will render:

<title>My Blog | My Post Title</title>

So you will get rid of the lines inside the title,

Hope that's helps.

Note: This is used for Laravel 5.2, Not quite sure but as I remember, it works for Laravel 4 too.

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放我归山
3楼-- · 2019-02-11 12:57

You can simply use @append...

@extends('layouts.master')

@section('sidebar')
    <p>This is appended to the master sidebar.</p>
@append

@section('content')
    <p>This is my body content.</p>
@stop

See here.

To understand how this works...

The compileStatements() method in the BladeCompiler calls the method compileAppend(), as you can see here:

/**
 * Compile Blade Statements that start with "@"
 *
 * @param  string  $value
 * @return mixed
 */
protected function compileStatements($value)
{
    $callback = function($match)
    {
        if (method_exists($this, $method = 'compile'.ucfirst($match[1])))
        {
            $match[0] = $this->$method(array_get($match, 3));
        }

        return isset($match[3]) ? $match[0] : $match[0].$match[2];
    };

    return preg_replace_callback('/\B@(\w+)([ \t]*)(\( ( (?>[^()]+) | (?3) )* \))?/x', $callback, $value);
}

In turn, that inserts a call to appendSection() which looks like this:

/**
 * Stop injecting content into a section and append it.
 *
 * @return string
 */
public function appendSection()
{
    $last = array_pop($this->sectionStack);

    if (isset($this->sections[$last]))
    {
        $this->sections[$last] .= ob_get_clean();
    }
    else
    {
        $this->sections[$last] = ob_get_clean();
    }

    return $last;
}
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在下西门庆
4楼-- · 2019-02-11 13:03

The example in the documentation from Larvel website does indeed seem to be flawed, but I think it's a markdown parsing problem on the website, the same docs on github show the correct code:

In any case @parent does indeed work. The example in the docs should look like this:

@extends('layouts.master')

@section('sidebar')
    @parent

    <p>This is appended to the master sidebar.</p>
@stop

@section('content')
    <p>This is my body content.</p>
@stop

A quick look in the Illuminate/View/Factory.php confirms what @parent does:

/**
 * Append content to a given section.
 *
 * @param  string  $section
 * @param  string  $content
 * @return void
 */
protected function extendSection($section, $content)
{
    if (isset($this->sections[$section]))
    {
        $content = str_replace('@parent', $content, $this->sections[$section]);
    }

    $this->sections[$section] = $content;
}
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