您已在此页面上多次添加Google Maps API.这可能会导致意外错误

Question

使用谷歌地图时出现两个错误:

1. 警告:您已在此页面上多次添加Google Maps API.这可能会导致意外错误.
2. a为null(main.js)

我不知道两者之间是否有任何联系,但最终的结果是我的页面无法加载地图.

这是我的头标记:

<script type="text/javascript" src="../s/Jquery/jquery-1.6.1.min.js"></script>
<script type="text/javascript" src="../s/jquery.placeholder.min.js"></script>
<script type="text/javascript" src="../s/index.js"></script>
<script type="text/javascript" src="../s/Jquery/ui/jquery.ui.core.js"></script>
<script type="text/javascript" src="../s/Jquery/ui/jquery.ui.widget.js"></script>

<script type="text/javascript" src="../s/Jquery/ui/jquery.ui.position.js"></script>
<script type="text/javascript" src="../s/Jquery/ui/jquery.ui.autocomplete.js"></script>
<script src="../dd/markerclusterer_compiled.js" type="text/javascript"></script><script src="../dd/dealers_js.js" type="text/javascript"></script><script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=false"></script>

这是我称之为谷歌地图的功能:

function set_google_map(set_region)
{

        var zoom;
        var center;
        switch (set_region) {
            case "usa":
                zoom = 3;
                center = new google.maps.LatLng(37.09, -95.71);
                break;
            case "europe":
                zoom = 3;
                center = new google.maps.LatLng(48.58, 7.71);
                break;
            case "east":
                zoom = 3;
                center = new google.maps.LatLng(31, 121);
                break;
            default:
                zoom = 1;
                center = new google.maps.LatLng(35, 5);
        }
        // Creating the map  
        map = new google.maps.Map(document.getElementById('map'), options);
        google.maps.event.addListener(map, 'click', function(){
            clean_icons();
            if (infowindow) 
                infowindow.close();
        });
        map.setCenter(center);
        map.setZoom(zoom);


            //bounds = new google.maps.LatLngBounds();  
}

这些是我的变量:

var UseridEncr;
var super_category="ATE";
var infowindow;
var map;
var bounds;
var image="../dd/i/green.png";
var image_active="../dd/i/red.png";
var mc ;
var location_changed=true;
var current_region="usa";
var mcOptions = {gridSize:30, maxZoom: 8};
var last_marker;
var last_marker_z;
var DealersData ;
var markers=[];
var markers_selected=[];
claster_markers=[];
var current_view=0;
myData={};
var selected_items=[];
var total_selected=0;

谢谢你的快速回答.

Answer 1

我遇到了同样的问题.如果您的网页包含地图api超过一次,则会发生这种情况.

我已经检查了我的情况,有一个.js文件也在调用地图api,所以请先检查一下你是否包括地图api,如果你是,删除一个.

Answer 2

对于那些在运行时将 Google Map 脚本附加到 DOM 的人，您应该在下次重新附加之前删除 Google Map 的痕迹。

您可以通过以下 2 个步骤卸载谷歌地图脚本：

• 从 DOM 中删除谷歌地图脚本。
• 从 BOM（窗口对象）中删除 google。

例子

declare var window;


function removeGoogleMapScript() {
    console.debug('removing google script...');
    let keywords = ['maps.googleapis'];

    //Remove google from BOM (window object)
    window.google = undefined;

    //Remove google map scripts from DOM
    let scripts = document.head.getElementsByTagName("script");
    for (let i = scripts.length - 1; i >= 0; i--) {
        let scriptSource = scripts[i].getAttribute('src');
        if (scriptSource != null) {
            if (keywords.filter(item => scriptSource.includes(item)).length) {
                scripts[i].remove();
                // scripts[i].parentNode.removeChild(scripts[i]);
            }
        }
    }
}


function addGoogleMapScript() {
    removeGoogleMapScript();
    console.debug('adding google script...');
    let dynamicScripts = [`https://maps.googleapis.com/maps/api/js?v=quarterly&key=123yourApiKey`];
    for (let i = 0; i < dynamicScripts.length; i++) {
        let node = document.createElement('script');
        node.src = dynamicScripts[i];
        node.type = 'text/javascript';
        node.async = false;
        node.charset = 'utf-8';
        node.onload = uponFinishLoadingScript; //probably to initialise your map or something
        document.head.appendChild(node);
    }
}

Answer 3

这些文件中是否包含地图 API？

<script src="../dd/markerclusterer_compiled.js" type="text/javascript"></script>
<script src="../dd/dealers_js.js" type="text/javascript">