Question

我使用以下代码创建了一张谷歌地图：

function load() {
      var markersArray = [];
      var map = new google.maps.Map(document.getElementById("map"), {

        zoom: 13,
        mapTypeId: 'roadmap'
      });
      var infoWindow = new google.maps.InfoWindow;

      // Change this depending on the name of your PHP file
      downloadUrl("getMapMarkers.php", function(data) {
        var bounds = new google.maps.LatLngBounds();
        var xml = data.responseXML;
        var markers = xml.documentElement.getElementsByTagName("marker");
        for (var i = 0; i < markers.length; i++) {
          var name = markers[i].getAttribute("name");
          var type = markers[i].getAttribute("type");
          var point = new google.maps.LatLng(
              parseFloat(markers[i].getAttribute("lat")),
              parseFloat(markers[i].getAttribute("lng")));
          var brewID = markers[i].getAttribute("brewID");
          //construct url
          var breweryLink = "http://beerportfolio.com/breweryPage.php?id=" + brewID;

          //create directions link
          http://maps.google.com/maps?daddr=
          var directionsLink = "http://maps.google.com/maps?daddr=";
          directionsLink = directionsLink + markers[i].getAttribute("lat") +"," + markers[i].getAttribute("lng")

          var html = "<b><a href=\"" + breweryLink + "\">"+name+"</a> </b> <br/>" ;
          html = html + "<br> <br>";
          html = html + "<a  href=\"" + directionsLink + " \">(Click for Directions)</a>";
          var icon = customIcons[type] || {};
          var marker = new google.maps.Marker({
            map: map,
            position: point,
            icon: icon.icon,
            shadow: icon.shadow
          });
          markersArray.push(marker);



          bindInfoWindow(marker, map, infoWindow, html);
          bounds.extend(point);

        }
        map.fitBounds(bounds);
      });


    }

    function bindInfoWindow(marker, map, infoWindow, html) {
      google.maps.event.addListener(marker, 'click', function() {
        infoWindow.setContent(html);
        infoWindow.open(map, marker);
      });
    }

    function downloadUrl(url, callback) {
      var request = window.ActiveXObject ?
          new ActiveXObject('Microsoft.XMLHTTP') :
          new XMLHttpRequest;

      request.onreadystatechange = function() {
        if (request.readyState == 4) {
          request.onreadystatechange = doNothing;
          callback(request, request.status);
        }
      };

      request.open('GET', url, true);
      request.send(null);
    }

    function getMapVisit()
    {
        alert("clearing overlays...");
        clearOverlays();

        return false;
    }

function clearOverlays() {
  if (markersArray) {
    for (i in markersArray) {
      markersArray[i].setMap(null);
    }
  }
}



function setAllMap(map) {
    for (var i = 0; i < markers.length; i++) {
        markers[i].setMap(map);
    }
}

    function doNothing() {}

当我尝试删除标记以重新加载不同的标记时，我无法将它们从地图上删除。

按下按钮，我拨打getMapVisit()，然后拨打clearOverlays()，但clearOverlays()不会清除地图。在Chrome中，当我检查元素时，我收到此错误：

Uncaught ReferenceError: markersArray is not defined

第86行调用错误：

if (markersArray) {

我不知道为什么它在load()

顶部的明确初始化数组时没有定义

Answer 1

您需要在var markersArray = [];函数上方定义load，以便globally定义，并且可以在所有函数中访问。

尝试清除Google地图标记时的范围问题

1 个答案: