我正在嘗試獲取子類別的類別樹假設(shè)我有一個名為“配件”的子類別這個子類別有電子>筆記本電腦的父母所以它是電子產(chǎn)品>筆記本電腦>配件表 ：-----------------------------------------| id | parent_id | name ||---- |----------- |------------- || 1 | 0 | Electronics || 2 | 1 | Laptops || 3 | 2 | Accessories |-----------------------------------------我可以得到一個子類別的根類別，比如：function getTopParent($category) { if($category->parent_id === null) { return $category->name; } return getTopParent(App\Category::find($category->parent_id)); // Will return Electronics}我也知道如何顯示樹等類別，請參閱此處function printCategoryName($categories, $parentName = '') { foreach ($categories as $category) { $name = $parentName ? implode(' > ', [$parentName, $category->name]) : $category->name; echo sprintf('%s%s', $name, PHP_EOL); if (count($category->children) > 0) { printCategoryName($category->children, $name); } }}printCategoryName($categories);我需要的是給出一個類別，如配件，并獲取此子類別的樹和獲取類別樹：電子產(chǎn)品>筆記本電腦>配件。我怎樣才能做到這一點？
4 回答
慕妹3146593
TA貢獻1820條經(jīng)驗 獲得超9個贊
protected function getCategoriesTree()
{
$categories = Category::where('parent_id',0)->get();
if($categories->count())
{
foreach ($categories as $category)
{
$categories_tree[$category->id] = $this->getChildCategories($category);
}
}
return response()->json(['categories' => $categories_tree]);
}
private function getChildCategories($category)
{
$sub_categories = [];
$childs = Category::where('parent_id', $category->id)->get();
$sub_categories = $category;
$sub_categories['sub_categories'] = [];
if($childs->count())
{
$sub_categories['sub_categories'] = $childs;
}
return $sub_categories;
}
largeQ
TA貢獻2039條經(jīng)驗 獲得超8個贊
這就是我如何讓它工作：
function getParentsTree($category, $name)
{
if ($category->parent_id == null)
{
return $name;
}
$parent = Category::find($category->parent_id);
$name = $parent->name . ' > ' . $name;
return getParentsTree($parent, $name);
}
$cat = Category::find(1);
echo getParentsTree($cat, $cat->name);
輸出：Electronics > Laptops > Accessories
慕絲7291255
TA貢獻1859條經(jīng)驗 獲得超6個贊
我正在使用這種結(jié)構(gòu)
您的輸入類別模型App\Category.php
class Categories extends Model
{
public function parent()
{
return $this->hasOne('App\Category', 'parent_id','id');
}
public function childiren()
{
return $this->hasMany('App\Category', 'id','parent_id');
}
}
您的控制器ExampleController.php
public function example()
{
$data = Category::all();
return view('index', compact('data'));
}
您的刀片index.blade.php
<select>
@foreach($data as $categories)
<optgroup label="{{ $categories->name }}">
@foreach($categories->children as $category)
<option value="{{ $category->id }}">{{ $category->name }}</option>
@endforeach
</optgroup>
@endforeach
</select>
你也使用jquery選擇2
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