以下方法且添加在控件相关文件中

1. table组件图片在修改时丢失

配置好的图片在修改时直接丢失，只能重新上传

方法如下：有一定弊端，图片配置不会丢失但也无法删除，可用额外字段作删除标记

$form->saving(function (Form $form) {
            $images = $form->images;
            foreach ($images as $key => &$item) {
                if (isset($item['image']) && \request()->hasFile("images.{$key}.image")) {
                    unset($item['image']);
                    $item['image'] = \request()->file("images.{$key}.image")->store(config('filesystems.disks.public.directory.image'), 'public');
                } else {
                    $item['image'] = $form->model()->images[$key]['image'] ?? "";
                }
            }
            $form->model()->images = $images;
}

2.1. 表单输入框联动①：第二级随第一级切换而改变输入框类型

示例：如代码所示，需求为根据version切换显示channel_id还是coid

$form->select('version', '配置版本')
         ->options([0 => '渠道版', 1 => '企业版'])
         ->hideField(['channel_id', 'coid'], [[0 => 'channel_id'], [1 => 'coid']]);

$form->select('channel_id', '指定渠道')->options(Channel::all(['name', 'id'])->pluck('name', 'id'));
$form->select('coid', '指定企业')->options(Company::all(['id', 'name'])->pluck('name', 'id'));

我们只需要在select控件Select.php(App\Http\Admin\Extensions)中添加一下方法：

/**
     * 通过选择值，展示或隐藏某些字段
     * @param $fieldsGroup //参与隐藏或展示的字段组
     * @param $condition //条件:当值等于X的时候展示Y字段 [value=>fields]
     * @return $this
     */
    public function hideField($fieldsGroup, $condition)
    {
        $fieldsGroupClass = [];
        foreach ($fieldsGroup as $fieldName) {
            $fieldClassName = '.' . trim($fieldName, '.');
            $fieldsGroupClass[] = $fieldClassName;
        }
        $fieldClassName = implode(',', $fieldsGroupClass);
        foreach ($condition as &$fieldName) {
            $fieldName = array_map(function ($v) {
                return '.' . $v;
            }, $fieldName);
            $fieldName = implode(',', $fieldName);
        }
        unset($fieldName);
        $jsonCondition = json_encode($condition);
        $script = <<<EOT
$(function(){
    $(document).on('change',"{$this->getElementClassSelector()}",function(){
        var _this=$(this);
        var _val = _this.val();
        var _condition=$jsonCondition
        $("{$fieldClassName}").parents('.form-group').hide();
        $("{$fieldClassName}").attr('disable',true)
        if(_condition[_val]!=undefined){
           var e =_condition[_val];
           $(e).parents('.form-group').show();
           $(e).attr('disable',false)
        }
    });
    $("{$this->getElementClassSelector()}").trigger('change');
})
EOT;
        Admin::script($script);
        return $this;
    }

2.2. 表单输入框联动②：第二级随第一级切换而展示/隐藏

示例：如代码所示，需求为根据auto_product切换展示/隐藏app_id,secret配置

$form->select('auto_product', '产品自增')
                ->options([1 => '手动添加产品', 0 => '自动同步产品'])
                ->hideField2(['appid', 'secret']);

$form->text('appid', 'appid');
$form->text('secret', 'secret');

方法如下：

/**
     * 通过选择值，展示或隐藏某些字段 过去 现在 未来
     * @param $fieldsGroup //参与隐藏/展示的字段
     * @return $this
     */
    public function hideField2($fieldsGroup)
    {
        $fieldsGroupClass = [];
        foreach ($fieldsGroup as $fieldName) {
            $fieldClassName = '.' . trim($fieldName, '.');
            $fieldsGroupClass[] = $fieldClassName;
        }

        $script = <<<EOT
$(function(){
    $(document).on('change',"{$this->getElementClassSelector()}",function(){
        var _this=$(this);
        var _val = _this.val();
        if(_val == 1){
            $("{$fieldsGroupClass[0]}").parents('.form-group').hide();
            $("{$fieldsGroupClass[0]}").attr('disable',true);
            $("{$fieldsGroupClass[1]}").parents('.form-group').hide();
            $("{$fieldsGroupClass[1]}").attr('disable',true);
        }
        if(_val == 0){
            $("{$fieldsGroupClass[0]}").parents('.form-group').show();
            $("{$fieldsGroupClass[0]}").attr('disable',false);
            $("{$fieldsGroupClass[1]}").parents('.form-group').show();
            $("{$fieldsGroupClass[1]}").attr('disable',false);
        }
    });
    $("{$this->getElementClassSelector()}").trigger('change');
})
EOT;
        Admin::script($script);
        return $this;
    }

小结：

上面两种不同情况都很简单，一些简单的js，jQuery知识。有额外情况只需仿照以上代码，观察表单的dom结构做出相应修改即可。

3. 二级联动初始化问题

select二级联动在修改/添加界面的时候无法展示已有的配置，即使第一级有默认值

方法：重写联动select的load方法，添加以下代码$("{$this->getElementClassSelector()}").trigger('change');. 即在页面加载时就触发一次change事件，加载出我们已有的配置

方法如下：

/**
     * Load options for other select on change.
     *
     * @param string $field
     * @param string $sourceUrl
     * @param string $idField
     * @param string $textField
     *
     * @return $this
     */
    public function load($field, $sourceUrl, $idField = 'id', $textField = 'text', bool $allowClear = true)
    {
        if (Str::contains($field, '.')) {
            $field = $this->formatName($field);
            $class = str_replace(['[', ']'], '_', $field);
        } else {
            $class = $field;
        }

        $placeholder = json_encode([
            'id'   => '',
            'text' => trans('admin.choose'),
        ]);

        $script = <<<EOT
$(document).off('change', "{$this->getElementClassSelector()}");
$(document).on('change', "{$this->getElementClassSelector()}", function () {
    var select_value = $(this).attr('data-value');
    var target = $(this).closest('.fields-group').find(".$class");
    $.get("$sourceUrl",{q : this.value}, function (data) {
        target.find("option").remove();
        var data_value = target.attr("data-value");
        var values = data_value.split(',');
        $(target).select2({
            placeholder: $placeholder,
            allowClear: $allowClear,
            data: $.map(data, function (d) {
                d.id = d.$idField;
                d.text = d.$textField;
                console.log(String(d.id));
                if($.inArray(String(d.id), values) != -1){
                    d.selected = true;
                }
                return d;
            })
        }).trigger('change');
    });
});
 $("{$this->getElementClassSelector()}").trigger('change'); 
EOT;

        Admin::script($script);

        return $this;
    }

4. 复制当前数据并修改后添加

public function copy($id)
{
        return Admin::content(function (Content $content) use ($id) {

            $content->header('新建员工中心');
            $form = $this->form()->edit($id);
            $form->builder()->setMode();
            $form->setAction(route('employee.store'));
            $content->body($form);
        });
 }
表格
$grid->actions(function (Grid\Displayers\Actions $actions) {
          $url = route('employee.copy', ['id' => $actions->row->id]);
          $actions->append("<a href={$url}><i class='fa fa-copy'></i></a>");
 });