调用集合时如何在laravel刀片html属性中添加索引

Question

I am calling categories collection from controller and displaying in the blade in foreach loops

@foreach ($categories as $category)
    @foreach ($category->subcategories as $subcategory)
         <a class="a.toggle-vis" data-column="1">{{ $subcategory->name }}</a>
    @endforeach
@endforeach

I need to add index numbers generated in the loop from 1 in data-column value

data-column="1"
data-column="2"
data-column="3"

so on....in

Answer 1

For doing this you need to make a variable for counting after that you should pass that variable to view like below.

I am inside a method

public function getSingle($slug){
        $category= Post::where('slug','=',$slug)->first();
        if ($post != null) {
            $counter = 0;
            return view('blog.single')->withCategories($category)->withCounter($counter);

        } else {
            return view('error.error404');
    }

 }

After that you should access that Counter variable in view like below

    @foreach ($categories as $category)
      @foreach ($category->subcategories as $subcategory)
         <a class="a.toggle-vis" data-column="{{$counter++}}">{{ $subcategory->name }}</a>
      @endforeach
   @endforeach

Answer 2

The classic for will do

@foreach ($categories as $category)
    @for ($i = 0; $i < count($category->subcategories); $i++)
       <a class="a.toggle-vis" data-column="{{$i}}">{{ $category->subcategories[$i]->name }}</a>
    @endfor
@endforeach

Answer 3

For a shorter one, I think, we can do something like this. A little bit dirty in view but in the small snippet, it should be okay.

{{ !($index = 1) }}
@foreach ($categories as $category)
    @foreach ($category->subcategories as $subcategory)
         <a class="a.toggle-vis" data-column="{{ $index++ }}">{{ $subcategory->name }}</a>
    @endforeach
@endforeach

Answer 4

Use this simple solution (Laravel method):

$loop->iteration    The current loop iteration (starts at 1).

It will automatically increment, in every loop iteration.
Check docs:
The Loop Variable