Can't Show Google Map in Laravel 5

Try to show Google Map through blade.php file using javascript , when i route show blank page in browser . here is Controller code

 class ItemsController extends Controller {
   public function map(){
      $items = Item::all();
      return view('items.map',compact('items'));
}

}

And blade.php Code

@extends('app')
@section('content')
    <div class="container">
        <div class="row">
            <div id="map-canvas"></div>
        </div>
    </div>

    <script type="text/javascript">

        var mapOptions ={
            zoom :4,
            center:new google.maps.LatLng({{$items[0]->location}})
        }
        var map = new google.maps.Map(document.getElementById("map-canvas"),mapOptions);;

        @foreach($items as $item)
            var marker{{$item->id}}=new google.maps.Marker({
            position: new google.maps.LatLng({{$item->location}}),
            map:map,
            title:"{{$item->title}}"
        });
        @endforeach

    </script>

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