添加標記-Google Maps API v3

Question

我使用以下Javascript修改了標准Google Maps API的initialize（）函數和標准的addMarker函數。 地圖可以很好地加載和居中，但不會將標記添加到地圖中。 我看了前面的問題 ，但不確定自己在做什么錯。

<script type="text/javascript">
// Note that using Google Gears requires loading the Javascript
// at http://code.google.com/apis/gears/gears_init.js

var siberia = new google.maps.LatLng(60, 105);
var newyork = new google.maps.LatLng(40.69847032728747, -73.9514422416687); 
var usa = new google.maps.LatLng(44.58, -95.46); //middle of the US w 50 states     

var browserSupportFlag =  new Boolean();

function initialize() {
    var myOptions = {
    zoom: 4,
    mapTypeId: google.maps.MapTypeId.ROADMAP
  };
  var map = new google.maps.Map(document.getElementById("map_canvas"), myOptions)
  map.setCenter(usa);   
}

function getMyLocation() {
    var initialLocation= newyork;
    var myOptions = {
    zoom: 10,
    mapTypeId: google.maps.MapTypeId.ROADMAP
  };
    var map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);

    // Try W3C Geolocation (Preferred)
    if(navigator.geolocation) {
        browserSupportFlag = true;
        navigator.geolocation.getCurrentPosition(function(position) {
        initialLocation = new google.maps.LatLng(position.coords.latitude,position.coords.longitude);
        map.setCenter(initialLocation);
        addMarker(initialLocation);
    }, function() {
    handleNoGeolocation(browserSupportFlag);
    });
    // Try Google Gears Geolocation
    } else if (google.gears) {
        browserSupportFlag = true;
        var geo = google.gears.factory.create('beta.geolocation');
        geo.getCurrentPosition(function(position) {
        initialLocation = new google.maps.LatLng(position.latitude,position.longitude);
        map.setCenter(initialLocation);
        addMarker(initialLocation);
    }, function() {
        handleNoGeoLocation(browserSupportFlag);
    });
    // Browser doesn't support Geolocation
    } else {
        browserSupportFlag = false;
        handleNoGeolocation(browserSupportFlag);
    }

    function handleNoGeolocation(errorFlag) {
        if (errorFlag == true) {
            alert("Geolocation service failed.");
            initialLocation = newyork;
        } else {
             alert("Your browser doesn't support geolocation. We've placed you in Siberia.");
             initialLocation = siberia;
        }
        map.setCenter(usa);
    }

}

function addMarker(location) {
    marker = new google.maps.Marker({
    position: location,
    map: map, 
    title: "Hello World!"
    });
    //markersArray.push(marker);
}
</script>

Answer 1

因此，您的問題與范圍有關：

將此添加到您的初始化函數上方：

var map;

並在您的初始化函數中更改此：

  var map = new google.maps.Map(document.getElementById("map_canvas"), myOptions)

對此：

  map = new google.maps.Map(document.getElementById("map_canvas"), myOptions)

您無需在getlocation函數中重新創建地圖：

因此刪除這些行：

   var myOptions = {
    zoom: 10,
    mapTypeId: google.maps.MapTypeId.ROADMAP
  };
    var map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);

這是一個包含更改的jsfiddle：

http://jsfiddle.net/bQ3AG/

編輯：我剛剛注意到，當您確定其位置時，您要將縮放級別設置為10。

為此，您可以使用： map.setZoom(10); 而不是通過新的選項。