[AJAX] 取得google地圖四角座標

<?php

$id = $_GET[\'id\'];

// ....撈出這筆 id 的地址  過程略

$address = $book[\'address\'];

$map_api_key = 申請的 google maps API;

$smarty->assign(\'google_maps_js\', load_google_maps($map_api_key, $address));

function load_google_maps($map_api_key, $address) {

$gmap_js = \'

 <!-- Google Maps Mashup -->

 <script type="text/javascript" src="http://www.google.com/jsapi?key=\' ... "></script>

 <script type="text/javascript">

  google.load("maps", "2", {"locale" : "zh_TW"}); // 引入 maps api 、設定介面語系為正體中文

  function initialize() {

   //if (GBrowserIsCompatible()) { 判斷瀏覽器是否支援 google maps

   var map = new google.maps.Map2(document.getElementById("map"));

   var geocoder = new GClientGeocoder(); // 地理編碼解譯

   var address = "\'.$address.\'";

   map.addControl(new GSmallMapControl());

   map.addControl(new GOverviewMapControl());

   geocoder.getLatLng(address, function(point) {

    if (!point) {

     alert("Google Maps 找不到該地址，無法顯示地圖！"); // 如果Google Maps無法顯示該地址的警示文字

    } else {

     map.setCenter(point, 16);

     /* 暫訂 */

     var marker = createMarker(point, "\'.$address.\'");

     map.addOverlay(marker);

     

     var bounds = map.getBounds();

     // 西南座標

     var southWest = bounds.getSouthWest();

     // 東北座標

     var northEast = bounds.getNorthEast();

     // 地圖四角座標

     var lng1 = northEast.lng();

     var lng2 = southWest.lng();

     var lat1 = northEast.lat();

     var lat2 = southWest.lat();

     // 除錯

     //document.getElementById("debug").innerHTML = "xml.php?lng1="+ lng1 +"&lng2="+ lng2 +"&lat1="+ lat1 +"&lat2="+ lat2;

     GDownloadUrl("xml.php?lng1="+ lng1 +"&lng2="+ lng2 +"&lat1="+ lat1 +"&lat2="+ lat2, function(data, responseCode) {

      if(responseCode == 200) {

       var xml = GXml.parse(data);

       var markers = xml.documentElement.getElementsByTagName("marker");

       for (var i = 0; i < markers.length; i++) {

        var lat = parseFloat(markers[i].getAttribute("lat"));

        var lng = parseFloat(markers[i].getAttribute("lng"));

        var point = new GLatLng(lat,lng);

        var title = markers[i].getAttribute("title");

        //var address = markers[i].getAttribute("title");

        //var title = markers[i].getAttribute("title");

        var marker = createMarker(point, title);

        map.addOverlay(marker);

       }

      } else if(responseCode == -1) {

       alert("Data request timed out. Please try later.");

      } else {

       alert("Request resulted in error. Check XML file is retrievable.");

      }

     });

     

    }

   });

  }

  function createMarker(point, title) {

   var marker = new GMarker(point);

   var html = "<p><small>" + title + "</small></p>";

   GEvent.addListener(marker, "click", function() {

    marker.openInfoWindowHtml(html);

   });

   return marker;

  }

  google.setOnLoadCallback(initialize);

 </script>

\';

return $gmap_js;

}

$smarty->display(\'show_map.html\');

?>