Summary of custom template directives in the Laravel framework

Blade allows you to customize commands. You can use the directive method to register commands. The following article mainly summarizes and introduces relevant information about custom template instructions in the Laravel framework. The article introduces it in great detail through sample code. Friends who need it can refer to it. Let’s take a look together.

Introduction

I am learning laravel recently. One way to use templates in the Laravel framework is through controller layout. Usually we write it in the view template Complex logic looks messy, so using custom template directives can simplify your view logic and write more elegant code. Laravel Blade is a template engine that compiles its special syntax into PHP and HTML. With its special syntax, directives are sugar-coated functions that hide messy code behind them. Templates contain a large number of built-in instructions, such as @foreach/@if/@section/@extends, etc. The built-in instructions are enough for making a simple project, but when you write repeated complex functions in the code, then customize the template Directives may help you optimize your view structure.

Not much to say below, let’s take a look at the detailed introduction.

Customize a simple template directive

$expression parameter is optional

\Blade::directive('directive_name', function ($expression) {
 return $expression;
});

Usage in viewDemo

<p>@hello(&#39;World&#39;)</p>

The location where custom template directives are declaredAppServiceProvider.php

<?php
namespace App\Providers;
use Illuminate\Support\Facades\Blade;
use Illuminate\Support\ServiceProvider;
class AppServiceProvider extends ServiceProvider
{
 /**
  * Perform post-registration booting of services.
  *
  * @return void
  */
 public function boot()
 {
  Blade::directive(&#39;hello&#39;, function ($expression) {
   return "<?php echo &#39;Hello &#39; . {$expression}; ?>";
  });
 }
 /**
  * Register bindings in the container.
  *
  * @return void
  */
 public function register()
 {
  //
 }
}

Directives defined in this way are loaded successfully and can be used in any template

Notes

First point

You cannot directly access multiple parameters passed in the custom instruction, you need to traverse them

<p>@greet(&#39;Hi&#39;, &#39;Hammad&#39;)</p>
\Blade::directive(&#39;hello&#39;, function ($expression) {
 list($greet, $name) = explode(&#39;, &#39;, $expression);

 return "<?php echo {$greet} . &#39; &#39; . {$name}; ?>";
});

Like array() list() this is not a function, but a language structure

Second point

Be sure to always remember to filter the output. Generally, when using {{}}, Blade has already performed the filtering operation in advance. In order to prevent malicious users from injecting js code into the site, you must To escape HTML, you can use Laravel's own function e(), which is also equivalent to htmlentities()

\Blade::directive('hello', function ($expression) {
 return "<?php echo &#39;Hello &#39; . e({$expression}); ?>";
});

The third point

Every time you add or modify a custom template directive, be sure to clear the cached view template first. You can use clear Artisan

php artisan view:clear

Laravel5.5 new features

#When using custom template directives, most of them are just some form of conditions, which require us to register Three independent instructions, if/else/endif, currently Laravel5.5 already supports simplified conditional instructions. For example, in the following example, the template can use admin/else/endadmin

public function boot()
{
 \Blade::if('admin', function () {
  return auth()->check() && auth()->user()->isAdmin();
 });
}

Summary

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