// 示例：根据选择框的值动态显示/隐藏字段
document.getElementById('formType').addEventListener('change', function() {
    const selectedValue = this.value;
    const extraField = document.getElementById('extraField');
    
    if (selectedValue === 'advanced') {
        extraField.style.display = 'block';
    } else {
        extraField.style.display = 'none';
    }
});

// 控制器中动态生成表单字段
public function createForm(Request $request)
{
    $fields = [];
    
    if ($request->has('type')) {
        if ($request->type === 'user') {
            $fields = [
                'name' => 'text',
                'email' => 'email',
                'password' => 'password'
            ];
        } elseif ($request->type === 'product') {
            $fields = [
                'title' => 'text',
                'price' => 'number',
                'description' => 'textarea'
            ];
        }
    }
    
    return view('dynamic-form', compact('fields'));
}

// dynamic-form.blade.php
<form method="POST" action="/submit-form">
    @csrf
    
    @foreach($fields as $name => $type)
        <div class="form-group">
            <label for="{{ $name }}">{{ ucfirst($name) }}</label>
            
            @if($type === 'textarea')
                <textarea name="{{ $name }}" class="form-control"></textarea>
            @else
                <input type="{{ $type }}" name="{{ $name }}" class="form-control">
            @endif
        </div>
    @endforeach
    
    <button type="submit" class="btn btn-primary">Submit</button>
</form>

// 使用jQuery动态加载表单部分
$('#category').change(function() {
    $.ajax({
        url: '/get-form-fields',
        data: {category: $(this).val()},
        success: function(response) {
            $('#dynamic-fields').html(response);
        }
    });
});

// 动态验证规则
public function rules()
{
    $rules = [
        'form_type' => 'required',
    ];
    
    if ($this->input('form_type') === 'advanced') {
        $rules['advanced_field'] = 'required|min:5';
    }
    
    return $rules;
}

<input value="{{ old('dynamic_field') }}" ...>