Do you know these 5 very useful Blade commands?

                                                                                                                         

The following is the Laravel Frameworktutorial column to introduce you to 5 very useful Blade instructions. I hope it will be helpful to friends in need!

Next I will introduce you to five Laravel Blade commands, which will make you even more powerful when solving specific problems. If you are new to Laravel, these tips can help you realize the convenience and efficiency of the Laravel Blade template engine.

Without further ado, let’s get started.

1. Check whether the user is authenticated

You can check whether the user is authenticated by verifying whether it is empty:

@if(auth()->user())
    // 用户已认证
@endif

However, Laravel's own Blade command can be more concise To achieve the same function:

@auth
    // 用户已认证
@endauth

2. Detect whether the user is a guest

In contrast to authentication, we can use the auth auxiliary function guest() Method to detect whether the user is a guest:

@if(auth()->guest())
    // 用户未认证
@endif

However, Laravel also provides the @guest command:

@guest
    // 用户未认证
@endguest

We can also use else statement to combine these two commands:

@guest
    // 用户未认证
@else
    // 用户已认证
@endguest

3. If the first view exists, introduce it, otherwise introduce the second one

Building a multi-theme site may have a Do you know these 5 very useful Blade commands? if it exists Just introduce it, otherwise it will introduce another need. You can simply use conditional judgment to achieve it:

@if(view()->exists('first-view-name'))
    @include('first-view-name')
@else
    @include('second-view-name')
@endif

But there is still a more concise and intuitive command to do this:

@includeFirst(['first-view-name', 'second-view-name']);

4. Introducing views based on conditions

When you only want to add some content based on certain logic (such as an authenticated user), introducing views based on conditions is very useful.

You can use @if conditions to write like this:

@if($post->hasComments())
    @include('posts.comments')
@endif

We can do it with just one line of command @includeWhen:

@includeWhen($post->hasComments(), 'posts.comments');

5. Introduce an existing view

If you have a custom theme system or you need to dynamically create Blade views, then checking whether the Do you know these 5 very useful Blade commands? exists is a must.

You can call the exists method on the auxiliary function view():

@if(view()->exists('view-name'))
    @include('view-name')
@endif

You can also use the Blade command includeIf Processing:

@includeIf('view-name')

You can learn more practical techniques to optimize the front-end template in your Laravel project through the Blade official documentation.

Happy refactoring!

Original address: https://laravel-news.com/five-useful-laravel-blade-directives

Translation address: https://learnku.com/laravel/ t/12328/5-very-useful-blade-designation-which-have-you-used

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