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表单构造器

开始

准备 Livewire 组件

实现 HasForms 接口，使用 InteractsWithForms trait:

<?php
 
namespace App\Http\Livewire;
 
use Filament\Forms;
use Illuminate\Contracts\View\View;
use Livewire\Component;
 
class EditPost extends Component implements Forms\Contracts\HasForms 
{
    use Forms\Concerns\InteractsWithForms; 
    
    public function render(): View
    {
        return view('edit-post');
    }
}

在 Livewire 组件视图中，渲染表单:

<form wire:submit.prevent="submit">
    {{ $this->form }}
    
    <button type="submit">
        Submit
    </button>
</form>

最后，将表单字段控件和布局组件添加到 getFormSchema() 方法中:

<?php
 
namespace App\Http\Livewire;
 
use Filament\Forms;
use Illuminate\Contracts\View\View;
use Livewire\Component;
 
class EditPost extends Component implements Forms\Contracts\HasForms
{
    use Forms\Concerns\InteractsWithForms;
    
    public Post $post;
    
    public $title;
    public $content;
    
    public function mount(): void
    {
        $this->form->fill([
            'title' => $this->post->title,
            'content' => $this->post->content,
        ]);
    }
    
    protected function getFormSchema(): array 
    {
        return [
            Forms\Components\TextInput::make('title')->required(),
            Forms\Components\MarkdownEditor::make('content'),
            // ...
        ];
    } 
    
    public function submit(): void
    {
        // ...
    }
    
    public function render(): View
    {
        return view('edit-post');
    }
}

在浏览器中访问 Livewire 组件，你就能看到 getFormSchema() 方法中的表单组件。

初始化表单

当 Livewire 组件被加载时，你就必须初始化表单。这个过程由 fill() 表单方法实现，通常是在 Livewire 组件的 mount() 方法调用。

要让这些字段加载数据，应该在 Livewire 组件上给他们添加一个相应的属性名，正如普通的 Livewire 组件一般。

<?php
 
namespace App\Http\Livewire;
 
use App\Models\Post;
use Filament\Forms;
use Illuminate\Contracts\View\View;
use Livewire\Component;
 
class CreatePost extends Component implements Forms\Contracts\HasForms
{
    use Forms\Concerns\InteractsWithForms;
    
    public $title = '';
    public $content = '';
    
    public function mount(): void 
    {
        $this->form->fill();
    } 
    
    protected function getFormSchema(): array
    {
        return [
            Forms\Components\TextInput::make('title')
                ->default('Status Update') 
                ->required(),
            Forms\Components\MarkdownEditor::make('content'),
        ];
    }
    
    public function render(): View
    {
        return view('create-post');
    }
}

你可以使用 afterStateHydrated() 方法自定义表单填充后的操作。

表单数据填充

要填充表单数据，须在表单上调用 fill() 方法，传入一个数组作为参数以供填充:

<?php
 
namespace App\Http\Livewire;
 
use App\Models\Post;
use Filament\Forms;
use Illuminate\Contracts\View\View;
use Livewire\Component;
 
class EditPost extends Component implements Forms\Contracts\HasForms
{
    use Forms\Concerns\InteractsWithForms;
    
    public Post $post;
    
    public $title;
    public $content;
    
    public function mount(): void 
    {
        $this->form->fill([
            'title' => $this->post->title,
            'content' => $this->post->content,
        ]);
    } 
    
    protected function getFormSchema(): array
    {
        return [
            Forms\Components\TextInput::make('title')->required(),
            Forms\Components\MarkdownEditor::make('content'),
        ];
    }
    
    public function render(): View
    {
        return view('edit-post');
    }
}

从表单获取数据

要在数组中获取所有表单数据，需要在表单中调用 getState() 方法。

<?php
 
namespace App\Http\Livewire;
 
use App\Models\Post;
use Filament\Forms;
use Illuminate\Contracts\View\View;
use Livewire\Component;
 
class CreatePost extends Component implements Forms\Contracts\HasForms
{
    use Forms\Concerns\InteractsWithForms;
    
    public $title = '';
    public $content = '';
    
    public function mount(): void
    {
        $this->form->fill();
    }
    
    protected function getFormSchema(): array
    {
        return [
            Forms\Components\TextInput::make('title')->required(),
            Forms\Components\MarkdownEditor::make('content'),
        ];
    }
    
    public function create(): void 
    {
        Post::create($this->form->getState());
    } 
    
    public function render(): View
    {
        return view('create-post');
    }
}

当 getState() 运行时:

  1. 先进行表单验证，如果出现错误，就不会提交表单。
  2. 所有等待上传的文件都会被永久保存在文件系统中。
  3. 如果定义了关联字段，就会被保存。

你可以使用 dehydrateStateUsing() 方法，对已经脱水的数据进行转换。

注册模型

你可以给表单注册一个模型。表单构造器可以用这个模型解锁 DX 特性。如：

  • 当使用像 exists 和 unique 这样的数据库验证规则时，会自动检索数据库名
  • 当使用像 Select、Repeater、SpatieMediaLibraryFileUpload 或 SpatieTagsInput 这样的字段控件时，保存表单时会自动将关联同时附加到模型中。

使用 getFormModel() 将模型实例作为参数到表单中:

<?php
 
namespace App\Http\Livewire;
 
use App\Models\Post;
use Filament\Forms;
use Illuminate\Contracts\View\View;
use Livewire\Component;
 
class EditPost extends Component implements Forms\Contracts\HasForms
{
    use Forms\Concerns\InteractsWithForms;
    
    public Post $post;
    
    public $title;
    public $content;
    public $tags;
    
    public function mount(): void
    {
        $this->form->fill([
            'title' => $this->post->title,
            'content' => $this->post->content,
        ]);
    }
    
    protected function getFormSchema(): array
    {
        return [
            Forms\Components\TextInput::make('title')->required(),
            Forms\Components\MarkdownEditor::make('content'),
            Forms\Components\SpatieTagsInput::make('tags'),
        ];
    }
    
    protected function getFormModel(): Post 
    {
        return $this->post;
    } 
    
    public function render(): View
    {
        return view('edit-post');
    }
}

此外，使用 model() 方法，你也可以将模型实例作为参数，传入到需要它的表单字段控件之中：

<?php
 
namespace App\Http\Livewire;
 
use App\Models\Post;
use Filament\Forms;
use Illuminate\Contracts\View\View;
use Livewire\Component;
 
class EditPost extends Component implements Forms\Contracts\HasForms
{
    use Forms\Concerns\InteractsWithForms;
    
    public Post $post;
    
    public $title;
    public $content;
    public $tags;
    
    public function mount(): void
    {
        $this->form->fill([
            'title' => $this->post->title,
            'content' => $this->post->content,
        ]);
    }
    
    protected function getFormSchema(): array
    {
        return [
            Forms\Components\TextInput::make('title')->required(),
            Forms\Components\MarkdownEditor::make('content'),
            Forms\Components\SpatieTagsInput::make('tags')->model($this->post), 
        ];
    }
    
    public function render(): View
    {
        return view('edit-post');
    }
}

现在你可以使用关联字段了；

注册模型类

某些情况下，在表单提交之前模型实例不可用。比如，新建 post 的表单：在提交表单之前，post 模型的实例不会被传到表单里。

你可以通过注册模型类代替，取得如前面注册模型的一些特性：

<?php
 
namespace App\Http\Livewire;
 
use App\Models\Post;
use Filament\Forms;
use Illuminate\Contracts\View\View;
use Livewire\Component;
 
class CreatePost extends Component implements Forms\Contracts\HasForms
{
    use Forms\Concerns\InteractsWithForms;
    
    public $title = '';
    public $content = '';
    public $categories = [];
    
    public function mount(): void
    {
        $this->form->fill();
    }
    
    protected function getFormSchema(): array
    {
        return [
            Forms\Components\TextInput::make('title')
                ->required(),
            Forms\Components\MarkdownEditor::make('content'),
            Forms\Components\Select::make('categories')
                ->multiple()
                ->relationship('categories', 'name'),
        ];
    }
    
    protected function getFormModel(): string 
    {
        return Post::class;
    } 
    
    public function render(): View
    {
        return view('create-post');
    }
}

现在你可以使用关联字段了。

关联字段

有一些字段，如 Select、Repeater、SpatieMediaLibraryFileUpload 或 SpatieTagsInput 可以与模型关联交互。

比如，Select 可用于添加多条记录到 BelongstoMany 关联模型中。当注册模型到表单或者组件时，这些关联字段也会在调用 getState() 时 自动被保存到关联的透视表中：

<?php
 
namespace App\Http\Livewire;
 
use App\Models\Post;
use Filament\Forms;
use Illuminate\Contracts\View\View;
use Livewire\Component;
 
class EditPost extends Component implements Forms\Contracts\HasForms
{
    use Forms\Concerns\InteractsWithForms;
    
    public Post $post;
    
    public $title;
    public $content;
    public $categories;
    
    public function mount(): void
    {
        $this->form->fill([
            'title' => $this->post->title,
            'content' => $this->post->content,
        ]);
    }
    
    protected function getFormSchema(): array
    {
        return [
            Forms\Components\TextInput::make('title')
                ->required(),
            Forms\Components\MarkdownEditor::make('content'),
            Forms\Components\Select::make('categories')
                ->multiple()
                ->relationship('categories', 'name'),
        ];
    }
    
    protected function getFormModel(): Post 
    {
        return $this->post;
    }
    
    public function save(): void
    {
        $this->post->update(
            $this->form->getState(),
        );
    } 
    
    public function render(): View
    {
        return view('edit-post');
    }
}

手动保存关联字段

某些情况下，在表单提交之前模型实例不可用。比如，在新建 post 的表单中，提交表单前 post 的实例不会被传到表单 form 里。这种情况下，你需要传模型类代替，不过，关联字段就需要随后手动进行保存了。

这种情况下，你可以在实例创建后在表单上调用 model() 和 saveRelationships() 方法:

<?php
 
namespace App\Http\Livewire;
 
use App\Models\Post;
use Filament\Forms;
use Illuminate\Contracts\View\View;
use Illuminate\Database\Eloquent\Model;
use Livewire\Component;
 
class CreatePost extends Component implements Forms\Contracts\HasForms
{
    use Forms\Concerns\InteractsWithForms;
    
    public $title = '';
    public $content = '';
    public $tags = [];
    
    public function mount(): void
    {
        $this->form->fill();
    }
    
    protected function getFormSchema(): array
    {
        return [
            Forms\Components\TextInput::make('title')->required(),
            Forms\Components\MarkdownEditor::make('content'),
            Forms\Components\SpatieTagsInput::make('tags'),
        ];
    }
    
    protected function getFormModel(): string
    {
        return Post::class;
    }
    
    public function create(): void
    {
        $post = Post::create($this->form->getState());
        
        $this->form->model($post)->saveRelationships(); 
    }
    
    public function render(): View
    {
        return view('create-post');
    }
}

字段隐藏时保存关联数据

默认情况下，关联只会在字段可见的情况下保存。比如，假设你有一个 Repeater 字段，只在特定条件下可见；这种情况下，当组件隐藏时，关联不会被保存。

如果你在字段隐藏时仍然想要保存关联数据，这样可能会带来意料之外的行为。要使关联数据强制保存，你可以在表单组件中调用 saveRelationshipsWhenHidden() 方法：

use Filament\Forms\Components\SpatieMediaLibraryFileUpload;
 
SpatieMediaLibraryFileUpload::make('attachments')
    ->visible(fn (Closure $get): bool => $get('has_attachments'))
    ->saveRelationshipsWhenHidden();

使用多重表单

默认情况下，每个 Livewire 组件中 InteractsWithForm trait 只处理一个表单。要实现多重表单，你可以重写 getForms() 方法让他返回多个表单，并让每个表单都有一个唯一的表单名:

<?php
 
namespace App\Http\Livewire;
 
use App\Models\Author;
use App\Models\Post;
use Filament\Forms;
use Illuminate\Contracts\View\View;
use Livewire\Component;
 
class EditPost extends Component implements Forms\Contracts\HasForms
{
    use Forms\Concerns\InteractsWithForms;
    
    public Author $author;
    public Post $post;
    
    public $title;
    public $content;
    
    public $name;
    public $email;
    
    public function mount(): void
    {
        $this->postForm->fill([
            'title' => $this->post->title,
            'content' => $this->post->content,
        ]);
        
        $this->authorForm->fill([
            'name' => $this->author->name,
            'email' => $this->author->email,
        ]);
    }
    
    protected function getPostFormSchema(): array
    {
        return [
            Forms\Components\TextInput::make('title')->required(),
            Forms\Components\MarkdownEditor::make('content'),
        ];
    }
    
    protected function getAuthorFormSchema(): array
    {
        return [
            Forms\Components\TextInput::make('name')->required(),
            Forms\Components\TextInput::make('email')->email()->required(),
        ];
    }
    
    public function savePost(): void
    {
        $this->post->update(
            $this->postForm->getState(),
        );
    }
    
    public function saveAuthor(): void
    {
        $this->author->update(
            $this->authorForm->getState(),
        );
    }
    
    protected function getForms(): array 
    {
        return [
            'postForm' => $this->makeForm()
                ->schema($this->getPostFormSchema())
                ->model($this->post),
            'authorForm' => $this->makeForm()
                ->schema($this->getAuthorFormSchema())
                ->model($this->author),
        ];
    } 
    
    public function render(): View
    {
        return view('edit-post');
    }
}

将表单数据纳入数组属性

你可以在 Livewire 组件上将所有表单数据归入到一个类型为数组的属性中。这样你就可以不必为每个字段定义新属性：

<?php
 
namespace App\Http\Livewire;
 
use App\Models\Post;
use Filament\Forms;
use Illuminate\Contracts\View\View;
use Livewire\Component;
 
class EditPost extends Component implements Forms\Contracts\HasForms
{
    use Forms\Concerns\InteractsWithForms;
    
    public Post $post;
    
    public $data; 
    
    public function mount(): void
    {
        $this->form->fill([
            'title' => $this->post->title,
            'content' => $this->post->content,
        ]);
    }
    
    protected function getFormSchema(): array
    {
        return [
            Forms\Components\TextInput::make('title')->required(),
            Forms\Components\MarkdownEditor::make('content'),
            Forms\Components\SpatieTagsInput::make('tags'),
        ];
    }
    
    protected function getFormModel(): Post
    {
        return $this->post;
    }
    
    protected function getFormStatePath(): string 
    {
        return 'data';
    } 
    
    public function render(): View
    {
        return view('edit-post');
    }
}

此例中，所有表单数据都会被存到 $data 数组中。

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