laravel blade, how to append to a section

php template-engine laravel laravel-4 blade

2022-08-30 13:19:07

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

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

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 for instance.@parent

答案 1

The example in the documentation from Laravel 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 does indeed work. The example in the docs should look like this:@parent

@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 confirms what does:Illuminate/View/Factory.php@parent

/**
 * 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;
}

答案 2

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

/**
 * 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 which looks like this:appendSection()

/**
 * 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;
}