resources/views/filters/dropdown-filter.blade.php
<select class="{{ $cssClass }}" name="filters[{{ $name }}]" v-model="filters['{{ $name }}']" v-on:change="filter(true)">
<option value=""></option>
@foreach ($items as $k => $v)
<option value="{{ $k }}">{{ $v }}</option>
@endforeach
</select>