How to pass id when selecting value through the list box.

Show you code.

We cannot help by guessing.. :)

If you're talking about select boxes, the value you insert into the 'value' attribute is sent through the form and you can access it by referencing the 'name' attribute of the select box.

If that's what you're asking.

<select name="choices">
  <option value="1">First Choice</option>
</select>

as mentioned, the options VALUE is sent with the form.

$request->input('choices') == 1

View

@foreach($suppliers as $key=>$value)
    <input list="supplier" name="supplier">
        <datalist id="supplier">
            <option value="{{$value}}">
        </datalist>
    @endforeach 

Controller

public function create()
{

$suppliers= Supplier::pluck('company_name', 'id');
return view('product.index',compact('suppliers'));
}

This should do it:

<input list="supplier" name="supplier">
@foreach($suppliers as $key=>$value)
        <datalist id="supplier">
            <option value="{{$key}}">{{$value}}</option>
        </datalist>
@endforeach