What is causing gray space on a Google Map using v

问题:

I'm trying to load a map as per the example in the Google documentation, but it's not loading. I tried using resize, but it's not loading correctly. This map is behind a tab rendered with the Prototype JavaScript Framework which magento uses. It loads correctly when not behind a tab.

<style type="text/css">
    #map_container { height:500px; width:700px;margin:0;}
</style>
<div id="map_container">
    <div id="map_canvas" style="width:500px;height:500px;"></div>
</div>
<script type="text/javascript"
    src="http://maps.googleapis.com/maps/api/js?key=APIKEY&sensor=true">
</script>
<script type="text/javascript">
    Event.observe( window, "load", function() {
        var myOptions = {
            center: new google.maps.LatLng(-34.397, 150.644),
            zoom: 6,
            mapTypeId: google.maps.MapTypeId.ROADMAP
        };
        var map = new google.maps.Map(document.getElementById("map_canvas"),
        myOptions);
        ;
        google.maps.event.trigger(map, "resize");
    });
</script>  

The map is shown with grey parts that cover most of the map and the UI elements are not fully initialized. I tried using google.maps.event.trigger(map, "resize");, but it does not seem to do anything. This div is inside a lot of divs.

回答1:

Example how to add new tab "GMaps" in Magento "Product Edit" (new tab "id" is 'product_info_tabs_GMaps')

PHP part

class My_Gmaps_Block_Adminhtml_Tabs_Gmaps extends Mage_Adminhtml_Block_Widget_Form

public function __construct() {

  parent::__construct();

  $this->setTemplate('my/gmaps/tabs/gmaps.phtml');

}

/............................./

}

Template part 'pwron/gmaps/tabs/gmaps.phtml':

<style>#map_canvas {width:100%; height:600px;}</style>
<div class="map" id="map_canvas"></div>

<script type="text/javascript" src="https://maps.googleapis.com/maps/api/js?sensor=false"></script>
<script type="text/javascript">
    var GMaps = Class.create();
    GMaps.prototype = {       ....................        }
    var gmaps = null;
    function switchGMapsTab(tab){
        if ( tab.tab.container.activeTab.id == 'product_info_tabs_GMaps'){
            if (!gmaps){
                gmaps = new GMaps({});
                gmaps.update();
            }
        }
    }
    varienGlobalEvents.attachEventHandler('showTab', switchGMapsTab);     <script>

trouble way 1. Created Map 2. Tab showed (not loads all tiles)

best way 1. Tab showed 2. Created Map

回答2:

I had the same problem as you. But I managed to find the solution with this simple code.

First, go to the file where you put the tab template, search for the <li> tag that load your map tab and put this inside:

<li onclick="reloadmap()">

And in the map script right after the

google.maps.event.addDomListener(window, 'load', initialize);

put this:

function reloadmap(){
  //when you resize the map, you lose your zoom and your center
  //so you need to get them again here
    z = map.getZoom();
    c = map.getCenter();
    google.maps.event.trigger(map, 'resize');
  //and set them again here
    map.setZoom(z);
    map.setCenter(c);
}