Google Maps API V3需要页面重新加载才能显示标记图标

use*_*648 4 javascript jquery google-maps-api-3 google-maps-markers

我正在从DB读取点作为JSON来在页面上创建地图标记和非结构化列表.添加一些代码以自定义列表元素后,地图停止在第一次请求时显示标记图标 - 直到发出页面重新加载.这是由于API超时吗?可以在加载地图后从数组构建列表对象,还是有其他方法来加速可能消除问题的代码?地图加载标记很好,加上这个标记(300+)的两倍,所以我知道问题是由于将格式添加到列表对象.不需要群集.此处提供该页面的演示版本

签了JS n00b.谢谢....... JSON POWERED GOOGLEMAP

<script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=false"></script>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.7/jquery.min.js"></script>

<script type="text/javascript" charset="utf-8"> 
var map;
    var infoWindow = new google.maps.InfoWindow();
    function initialize() {
        var myLatlng = new google.maps.LatLng(49.57154029531499,-125.74951171875);

        var myOptions = {
            zoom: 8,
            center: myLatlng,
            mapTypeId: google.maps.MapTypeId.TERRAIN,
            streetViewControl: false
            }

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

        } /* end initialize function */


<!--  load points from database into Locations JSON -->

$(document).ready(function () {
    initialize();
    $.getJSON("map-service.php?action=listpoints", function(json) {

    if (json.Locations.length > 0) {
        for (i=0; i<json.Locations.length; i++) {
            var location = json.Locations[i];
                addMarker(location); 
                }
            }
        });

    //define grn icon as closed
    var greenicon = 'http://maps.google.com/mapfiles/ms/icons/green-dot.png';

    function addMarker(location) {
            if(location.datesummit == "0000-00-00") {
                var markerOptions = {map: map, title: location.name, position: new google.maps.LatLng(location.lat, location.lng),icon: greenicon};
                //create marker info window content
                var html='<B>'+location.name+'</B><BR> Register a summit <A href="http://goo.gl/Nl0UQ">here</A>  ';
                //create list element text and onclick          
                $("<li class=\"notclimbed\">")
                .html(location.name+"</li>") 
                .click(function(){ 
                    infoWindow.close();
                    infoWindow.setContent(html);
                    infoWindow.open(map, marker)
                }) 
                .appendTo("#list"); 
            }
            else{
                var markerOptions = {map: map, title: location.name, position: new google.maps.LatLng(location.lat, location.lng)};
                //create marker info window content
                var html='<B>'+location.name+'</B><BR> Summitted: '+location.datesummit+'<BR> By:'+location.summitlog;
                //create list element text and onclick  
                $("<li class=\"climbed\">")
                .html(location.name+"</li>") 
                .click(function(){ 
                    infoWindow.close();
                    infoWindow.setContent(html);
                    infoWindow.open(map, marker)
                }) 
                .appendTo("#list"); 
            }
            var marker = new google.maps.Marker(markerOptions);

            // add a listener to open an info window when a user clicks on one of the markers
            google.maps.event.addListener(marker, 'click', function() {
                infoWindow.close();
                infoWindow.setContent(html);
                infoWindow.open(map, marker);
                });

        }; // end of addmarker function
});
</script>
</head>


<body>
<div id="banner" {vertical-align:text-top;} >
    <img src="test.jpg" alt="Logo" style="width:150px;height:150px;vertical-align:middle">
    <img src="test.png" alt="Logo" style="vertical-align:middle">
</div>

<div id="map_canvas" >
        Map Here!
</div>

<div id="mindthegap"></div>

<div id="list" >    </div>
</body>
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Cor*_*bin 5

在将map变量传递给markerOptions之前,需要确保初始化map变量.

一些过于热心的调试告诉我,在页面失败的时候,地图仍未定义.

在$(文件).就绪()通常会body.onload之前进行的,所以要么把调用初始化()在你的$的最顶端(文件).就绪(函数(){...}); 或者将代码初始化在那里.

此外,尽管不是绝对必要,但您应该考虑封装地图变量而不是使用全局变量.如果您想在一个页面上有2张地图怎么办?