Use `Laravel` `template` and `blade`

Mar 25 2019 Dev 3 minutes read (About 517 words)

Introduction

This article is a learning record of Laravel, mainly about how to use Laravel blade. Here are some points:

Create and reuse template
Use yield and section
Pass data to view
What {{ }} does for us?

Create `template`

Create a template named layout as follows:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    // Set range of title with yield, and set 'Laracasts' as its default value. If value of title is not specified, default value will be applied
    <title>@yield('title', 'Laracasts')</title>
</head>
<body>
<ul>
    <li><a href="/">Welcome</a></li>
    <li><a href="/about">About</a></li>
    <li><a href="/contact">contact</a></li>
</ul>
// Set range of section named content with yield
@yield('content')
</body>
</html>

Use `section`

we could directly use the template we created above

// We directly apply the 'template' named 'layout'
@extends('layout')
// Use section, insert value we want into the area we've set in template. We insert value into 'title' section
@section('title', 'Welcome Page')
// Use section to insert value into section named 'content'
@section('content')
   <h1>Welcome here</h1>
// Use endsection to specify the range of section named 'content'
@endsection

Repeat the operation above, we apply this templete to multiple pages

Pass value to `view`

To pass value to view, actually there is a couple of ways. I will list 4 of them below:

Route::get('/', function () {
    $task = [
        'Go to the school',
        'Go to the market',
        'Go to work'
    ];

    return view('welcome', compact('task')
    );

});

Route::get('/', function () {
    $task = [
        'Go to the school',
        'Go to the market',
        'Go to work'
    ];

    return view('welcome', ['tasks' => $task]
    );

Route::get('/', function () {

    return view('welcome', ['tasks' => [
        'Go to the school',
        'Go to the market',
        'Go to work'
    ]]);

});

Route::get('/', function () {

    return view('welcome')->withTasks([
        'Go to the school',
        'Go to the market',
        'Go to work'
    ]);

});

4 of them above, Ray would like to use the first one.

Catch the value in `view`

Catch the value in view and render

@extends('layout')
@section('title', 'Welcome Page')
@section('content')
    <h1>Welcome here</h1>
    <ul>
        @foreach ($tasks as $task)
            <li>
                {{ $task }}
            </li>
        @endforeach
    </ul>
@endsection

In blade file of Laravel, we would fetch variables within {{ }}
As follows:

What blade {{ }} does for us?

Besides for fetching passed data, {{ }} also execute function of PHP called htmlspecialchars to prevent XSS attack

Let’s make an experiment with blade

Route::get('/', function () {

    $test = '<script>alert("test")</script>';
    return view('welcome')->withTasks([
        'Go to the school',
        'Go to the market',
        'Go to work'
    ])->withTest($test);

});

@extends('layout')
@section('title', 'Welcome Page')
@section('content')
    <h1>{{ $test }}</h1>
    <ul>
        @foreach ($tasks as $task)
            <li>
                {{ $task }}
            </li>
        @endforeach
    </ul>
@endsection

As what shows above, the browser render the variable with script tag as follows:

Let’s have another experiment. We could deactivate htmlspecialchars by using {!! !!}, but be careful with this feature.

@extends('layout')
@section('title', 'Welcome Page')
@section('content')
    <h1>{!! $test !!}</h1>
    <ul>
        @foreach ($tasks as $task)
            <li>
                {{ $task }}
            </li>
        @endforeach
    </ul>
@endsection

The rendered result is as follows:

It shows that the script was executed without escaping

Conclusion

There are still a lot of usage about blade, I might update this article in the future.

#Laravel blade #Laravel template #Laravel view #Laravel

Use `Laravel` `template` and `blade`

Introduction

Create `template`

Use `section`

Pass value to `view`

Catch the value in `view`

What blade {{ }} does for us?

Conclusion

Comments

Your browser is out-of-date!

Use `Laravel` `template` and `blade`

Introduction

Create template

Use section

Pass value to view

Catch the value in view

What blade {{ }} does for us?

Conclusion

Comments

Your browser is out-of-date!

Create `template`

Use `section`

Pass value to `view`

Catch the value in `view`