php - Multi-level navigation using bootstrap in laravel 5 -

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i using laravel 5 framework.

i have categories table this:

enter image description here

i want make bootstrap menu multi-level if parent_id = id

this have tried far:

<ul class="nav navbar-nav navbar-right">             <li class="dropdown">         <a href="javascript:void(0)" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-expanded="false">categories <span class="caret"></span></a>         <ul class="dropdown-menu" role="menu">             @foreach( $category $cat )                 @if( $cat->id === $cat->parent_id)                     <ul class="dropdown-menu" role="menu">                         <li class="dropdown-submenu">                             <a href="{{ url( '/category', safeurl::make( $cat->name ) ) }}" data-toggle="dropdown-toggle" aria-expanded="false">{{ $cat->name }}                                 <ul class="dropdown-menu" role="menu">                                     <li>                                         <a href="{{ url( '/category', [safeurl::make( $cat->name ), safeurl::make( $cat->name )] ) }}"></a>                                     </li>                                 </ul>                             </a>                         </li>                     </ul>                 @else                     <li>                         <a href="{{ url( '/category', safeurl::make( $cat->name ) ) }}">{{ $cat->name }}</a>                     </li>                 @endif             @endforeach         </ul>     </li> </ul>

but results is, output 1 below other.

i want if parent_id = id, should show sub category next particular id.

for example, in current example, id = 6 has parent_id = 4, means, bootstrap menu should show sub-category link next clothing.

update 1:

after answer submitted, cannot display sub category.

here's code that:

<li class="dropdown">     <a href="javascript:void(0)" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-expanded="false">categories <span class="caret"></span></a>     <ul class="dropdown-menu" role="menu">         @foreach( $category $cat )             <li @if($cat->childs->count()) class="dropdown" @endif>                 <a href="javascript:void(0)" @if( $cat->childs->count() ) class="dropdown-toggle" data-toggle="dropdown" role="button" aria-expanded="false" @endif>                     {{ $cat->name }}                     @if( $cat->childs->count() )                         <span class="caret"></span>                     @endif                 </a>             @if( $cat->childs->count() )                 <ul class="dropdown-menu" role="menu">                     @foreach( $cat->childs $child )                         <a href="{{url('/category', [safeurl::make($cat->name), safeurl::make($child->name)])}}">                             {{ $child->name }}                         </a>                     @endforeach                 </ul>             @endif         </li>     @endforeach </ul>

how achieve ?

one way add relation in model

public function childs() {     return $this->hasmany('category', 'parent_id', 'id'); }

in controller select category parent_id==0

and in view can ask children:

@foreach( $category $cat )     <li @if($cat->childs->count()) class="dropdown" @endif>         <a href="{{ url( '/category', safeurl::make( $cat->name ) ) }}" @if($cat->childs->count()) class="dropdown-toggle" data-toggle="dropdown" role="button" aria-expanded="false" @endif>{{ $cat->name }} @if($cat->childs->count()) <span class="caret"></span> @endif</a>         @if($cat->childs->count())              <ul class="dropdown-menu" role="menu">              @foreach($cat->childs $child)                  <li><a href="{{ url( '/category', [safeurl::make( $child->name ), safeurl::make( $child->name )] ) }}"></a></li>              @endforeach              </ul>         @endif     </li> @endforeach

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