google map appear with grey inside modal in bootstrap

GomuGomuNoRocket

I use "Bootstrap v3.3.5 (http://getbootstrap.com) Copyright 2011-2015 Twitter, Inc. " for my site and i want to add google-map. I run this code, and all maps is grey. I dont understand why this not work with modal. Can someone help me ? I also have include

html

<body>
      <a class="openmodal" href="#contact"  data-toggle="modal" data-id="Peggy Guggenheim Collection - Venice">Contact</a>
      <div class="modal fade" id="contact" role="dialog" >
            <div class="modal-dialog modal-lg">
                <div class="modal-content" id="back" >  
                    <div class="modal-header">
                    <h4>Contact<h4>
                </div>
                <div class="modal-body">    
                    <div id="map"></div>
                </div>
                <div class="modal-footer">
                    <a class="btn btn-default" data-dismiss="modal">Close</a>
                </div>      
            </div>
      </div>
 </body>

javascript

 <script src="https://maps.googleapis.com/maps/api/js"></script>
<script>
  function initialize() {
    var mapCanvas = document.getElementById('map');
    var mapOptions = {
      center: new google.maps.LatLng(44.5403, -78.5463),
      zoom: 8,
      mapTypeId: google.maps.MapTypeId.ROADMAP
    }
    var map = new google.maps.Map(mapCanvas, mapOptions)
  }
  google.maps.event.addDomListener(window, 'load', initialize);
</script>

style

<style>
  #map {
    width: 500px;
    height: 400px;
  }
</style>
davidkonrad

Here is the code above in a working fiddle -> http://jsfiddle.net/wgur1z7n/ (bootstrap 3.3.5)

Trigger the google maps resize event after the modal is shown :

$('#contact').on('shown.bs.modal', function () {
    google.maps.event.trigger(map, "resize");
});

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