/web-development/laravel/laravel-blade.md

LARAVEL- conditions, loops, layouts

BLADE PHP TEMPLATE ENGINE

Blade is the Laravel official template engine and makes PHP easier to write using directives preceded by @

Display data

<h1> Hello, {{ $phpVariable }} </h1>

PHP Statement

@php
    $isActive = false;
    $hasError = true;
@endphp

IF Statements

@if (count($records) === 1)
    I have one record!
@elseif (count($records) > 1)
    I have multiple records!
@else
    I don't have any records!
@endif

UNLESS Statements

Unless a condition is verified:

@unless (Auth::check())
    You are not signed in.
@endunless

ISSET & EMPTY Statements

@isset($records)
    // $records is defined and is not null...
@endisset

@empty($records)
    // $records is "empty"...
@endempty

AUTHENTICATION Statements

Determine if a user is authenticated or guest

@auth
    // The user is authenticated...
@endauth

@guest
    // The user is not authenticated...
@endguest

ENVIROMENT Statements

Specify if an application is running in production/development, additionally you can create new enviroments:

@production
    // Production specific content...
@endproduction

@env('staging')
    // The application is running in "staging"...
@endenv

@env(['staging', 'production'])
    // The application is running in "staging" or "production"...
@endenv

SWITCH Statements

@switch($i)
    @case(1)
        First case...
        @break

    @case(2)
        Second case...
        @break

    @default
        Default case...
@endswitch

LOOPS Statements

@for ($i = 0; $i < 10; $i++)
    The current value is {{ $i }}
@endfor

@foreach ($users as $user)
    <p>This is user {{ $user->id }}</p>
@endforeach

@forelse ($users as $user)
    <li>{{ $user->name }}</li>
@empty
    <p>No users</p>
@endforelse

@while (true)
    <p>I'm looping forever.</p>
@endwhile

@foreach ($users as $user)
    @if ($loop->first)
        This is the first iteration.
    @endif

    @if ($loop->last)
        This is the last iteration.
    @endif

    <p>This is user {{ $user->id }}</p>
@endforeach

@foreach ($users as $user)
    @foreach ($user->posts as $post)
        @if ($loop->parent->first)
            This is the first iteration of the parent loop.
        @endif
    @endforeach
@endforeach

INCLUDE Statements

@include('shared.errors') //directory.file

BLADE LAYOUTS

Define a default layout:

<!-- !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! -->
<!-- resources/views/layouts/default.blade.php -->
<!-- !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! -->
<html>
    <head>
        <title>App Name - @yield('title')</title>
    </head>
    <body>
        @section('sidebar')
            This is the master sidebar.
        @show
        <div class="container">
            <!-- yield gets replace with section "content" -->
            @yield('content')
        </div>
    </body>
</html>

Extend layout with sections:

<!-- resources/views/child.blade.php -->

@extends('layouts.default')

@section('title', 'Page Title')

@section('sidebar')
    @parent

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

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

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