Blade Laravel 中的默认变量值

Default variable value in blade Laravel

提问by Sebastian Corneliu V?rlan

How do I set a default value to a variable in a blade partial?

如何为刀片部分中的变量设置默认值？

So for example I have 2 variables:

例如，我有 2 个变量：

• softDelete
• delete

• 软删除
• 删除

witch I want by default to be true.

女巫我希望默认情况下是真的。

@if($softDelete)
    <span data-toggle="tooltip" title="Publish">
        <a href="#delete-{{ $id }}" class="btn btn-default btn-xs btn-flat">
            <i class="fa fa-check"></i>
        </a>
    </span>
@endif

@if($delete)
    <span data-toggle="tooltip" title="Delete">
        <a href="#delete-{{ $id }}" class="btn btn-danger btn-xs btn-delete btn-flat details" data-toggle="modal" data-target="#delete_modal">
            <i class="fa fa-trash"></i>
        </a>
    </span>
@endif

And when I send the view from controller to change the value for some of the variables, depending the case I need.

当我从控制器发送视图以更改某些变量的值时，具体取决于我需要的情况。

return view('platform.pages.blocks.property_table_actions',
    [
        'id' => $model->id,
        'delete' => false
    ]);

I tried with a provider:

我尝试与提供商合作：

public function composeActionButtons()
{
    view()->composer('platform.pages.blocks.property_table_actions', function ($view) {
        $view
            ->with('softDelete', true)
            ->with('delete', true)
            ->with('view', true)
            ->with('edit', true);
    });
}

but override the false values from controller.

但覆盖来自控制器的错误值。

回答by Alex Meyer

Sometimes you may wish to echo a variable, but you aren't sure if the variable has been set. Basically, you want to do this:

有时您可能希望回显一个变量，但您不确定该变量是否已设置。基本上，你想这样做：

{{ isset($name) ? $name : 'Default' }}

{{ isset($name) ? $name : '默认' }}

However, instead of writing a ternary statement, Blade allows you to use the following convenient short-cut:

但是，Blade 允许您使用以下方便的快捷方式，而不是编写三元语句：

{{ $name or 'Default' }}

{{ $name 或“默认”}}

---

---

from the laravel docs.. it should check with isset if the variable exists.. if not a default value is shown

来自 laravel 文档 .. 如果变量存在，它应该检查 isset .. 如果不存在，则显示默认值

回答by Mike Barwick

I think you're approaching this task in the wrong way - personally. But if you insist, you could also just include a partial (I do this sometimes). Say in a variable, etc.

我认为您以错误的方式处理这项任务 - 就个人而言。但如果你坚持，你也可以只包含一个部分（我有时会这样做）。在变量中说，等等。

For example, something like this:

例如，这样的事情：

// in your view
@include('some.directory.for.partials', ['softDelete' => 'false']) // you can change this to any value

// partial can then run something like this:
@if(count($softDelete) || $softDelete)
    ...
@else
    ...
@endif

That said, I think you could probably just assign the variable in your controller when you're rendering your view. You're assigning a variable anyways. Why make things complicated with a view composer - when that logic could be in your controller? Just set 'delete' => falseto true or what have you for each.

也就是说，我认为您可以在渲染视图时在控制器中分配变量。无论如何，您正在分配一个变量。为什么使用视图作曲家让事情变得复杂 - 当该逻辑可以在您的控制器中时？只需设置'delete' => false为 true 或您对每个都有什么。

回答by Sebastian Corneliu V?rlan

I found the best method to be this:

我发现最好的方法是这样的：

<?php

 namespace App\Providers;

 use Illuminate\Support\Facades\Log;
 use Illuminate\Support\Facades\View;
 use Illuminate\Support\ServiceProvider;

 class ViewComposerServiceProvider extends ServiceProvider
{
/**
 * Bootstrap the application services.
 *
 * @return void
 */
public function boot()
{
    $this->composeActionButtons();
}

/**
 * Register the application services.
 *
 * @return void
 */
public function register()
{
    //
}

/**
 * Compose the Recent sidebar
 */
public function composeActionButtons()
{
    view()->creator('platform.pages.blocks.property_table_actions', function ($view) {
        $view
            ->with('softDelete', true)
            ->with('delete', true)
            ->with('view', true)
            ->with('edit', true);
    });

}
}

and in controller:

并在控制器中：

  return view('platform.pages.blocks.property_table_actions',
    [
        'id' => $model->id,
    ])
    ->with(['edit' =>false, 'softDelete' => false]);

View creators work almost exactly like view composers; however, they are fired immediately when the view is instantiated. The callback that I defined with the Creator is called immediately after view() , which is before any ->with()s. This enables me to set a default value for the View and then override it when the View is called, if desired.

视图创建者的工作方式几乎与视图作曲家完全一样；然而，当视图被实例化时，它们会立即被触发。我在 Creator 中定义的回调在 view() 之后立即调用，在任何 ->with() 之前。这使我能够为视图设置默认值，然后在调用视图时覆盖它（如果需要）。

回答by Waseem Hussain

In Controller.php

在 Controller.php 中

function __construct() {
    $softDelete= true;
    $data = array('softDelete'  => $softDelete);
    view()->share($data);
}