javascript - Google Map API inside a Reveal Modal not showing fully

Question

I am having problems with a Google Map that I have inside a div, which upon button click, pops up on screen. The Google Map is only partially showing. I know that I need to that I need to create a resize event, but do not know how, or where to put it. Any help would be much appreciated! Please keep in mind that I have little knowledge of JS!

Link to test site: CLICK ON GOOGLE MAP BUTTON TO SEE THE PROBLEM AT HAND:

http://simplicitdesignanddevelopment.com/Fannie%20E%20Zurb/foundation/contact_us.html#

My Google API script:

<script type="text/javascript">
    function initialize() {
        var mapOptions = {
            center: new google.maps.LatLng(39.739318, -89.266507),
            zoom: 5,
            mapTypeId: google.maps.MapTypeId.ROADMAP
        };
        var map = new google.maps.Map(document.getElementById("map_canvas"), mapOptions);
    }  
</script> 

The div which contains the map:

<div id="myModal" class="reveal-modal large">
    <h2>How to get here</h2>
    <div id="map_canvas" style="width:600px; height:300px;"></div>
    <a class="close-reveal-modal">&#215;</a>
</div>

The script which calls the map upon button click:

<script type="text/javascript">
    $(document).ready(function() {
        $('#myModal1').click(function() {
            $('#myModal').reveal();
        });
    });
</script>

Answer 1

Following Two solutions worked for me

function initialize() {
   var mapOptions = {
    center: new google.maps.LatLng(39.739318, -89.266507),
    zoom: 5,
    mapTypeId: google.maps.MapTypeId.ROADMAP
  };
  var map = new google.maps.Map(document.getElementById("map_canvas"), mapOptions);
  return map;
}

<div id="myModal" class="reveal-modal" data-reveal>
  <div id="map_canvas" style="height: 300px"></div>
  <a class="close-reveal-modal">&#215;</a>
</div>


$(document).ready(function() {
  var myMap;
  $('#myModal').bind('open', function() {
    if(!myMap) {
      var myMap = initialize();
      setTimeout(function() {
        google.maps.event.trigger(myMap, 'resize');
      }, 300);                  
    }
  });
}

OR

$(document).ready(function() {
  var myMap;
  $('#myModal').bind('opened', function() {
    if(!myMap) {
      var myMap = initialize();
      google.maps.event.addDomListener(window, 'load', initialize);
    }
  });
});