GoogleMaps不会在网页加载时加载 | GoogleMaps不会在网页加载时加载

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问题描述

我无法使用GoogleMaps API V3运行我的地图。地图不加载。我希望地图出现在ID为 gisMap 的div中，但在Chrome调试器中，我得到以下消息：

I can't get my map running using the GoogleMaps API V3. The map does not load. I would expect the map to appear in the div with the id gisMap but in the Chrome Debugger I get the message:

Uncaught InvalidValueError: initMap is not a function

Javascript

var map;

function initMap() {
    // Enabling new cartography and themes
    google.maps.visualRefresh = true;

    // Setting starting options
    var mapOptions = {
        center: new google.maps.LatLng(39.9078, 32.8252),
        zoom: 10,
        mapTypeId: google.maps.MapTypeId.ROADMAP
    };

    // Getting Map DOM Element
    var mapElement = document.getElementById('gisMap');

    // Creating a map with DOM element
    map = new google.maps.Map(mapElement, mapOptions);
}

Bundle.js（摘录）

(...)
module.exports = Vue;
}).call(this,require('_process'))
},{"_process":1}],3:[function(require,module,exports){
'use strict';

var map;

function initMap() {
    // Enabling new cartography and themes
    google.maps.visualRefresh = true;

    // Setting starting options
    var mapOptions = {
        center: new google.maps.LatLng(39.9078, 32.8252),
        zoom: 10,
        mapTypeId: google.maps.MapTypeId.ROADMAP
    };

    // Getting Map DOM Element
    var mapElement = document.getElementById('gisMap');

    // Creating a map with DOM element
    map = new google.maps.Map(mapElement, mapOptions);
}

},{}],4:[function(require,module,exports){
'use strict';

var Vue = require('vue');

new Vue({});
(...)

HTML

<!doctype html>
<html lang="en">

    <head>
    <meta charset="UTF-8">
    <title>MFServer Test</title>

    <link rel="stylesheet" href="/css/app.css">
</head>
    <nav class="navbar navbar-inverse navbar-fixed-top">
    <div class="container">
        <div class="navbar-header">
            <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" aria-expanded="false" aria-controls="navbar">
                <span class="sr-only">Toggle navigation</span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
            </button>
            <a class="navbar-brand" href="#">MFDispo</a>
        </div>
        <div id="navbar" class="collapse navbar-collapse">
            <ul class="nav navbar-nav">
                <li class="active"><a href="#">Start</a></li>
                <li><a href="#about">GIS</a></li>
            </ul>
        </div><!--/.nav-collapse -->
    </div>
</nav>

    <body id="app">
        <div class="pageWrapper">
            <div id="gisMap"></div>
            <div id="content"></div>
        </div>

        <script src="/js/bundle.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js" integrity="sha256-KXn5puMvxCw+dAYznun+drMdG1IFl3agK0p/pqT9KAo= sha512-2e8qq0ETcfWRI4HJBzQiA3UoyFk6tbNyG+qSaIBZLyW9Xf3sWZHN/lxe9fTh1U45DpPf07yj94KsUHHWe4Yk1A==" crossorigin="anonymous"></script>
<script src="https://maps.googleapis.com/maps/api/js?key=AIzaSyBDucSpoWkWGH6n05GpjFLorktAzT1CuEc&callback=initMap" async defer></script>
    </body>

</html>

SCSS

@import "node_modules/bootstrap-sass/assets/stylesheets/bootstrap";
@import "partials/forms";

html, body {
  height: 100%;
  padding-top: 25px;
}

.pageWrapper {
  background-color: red;
  height:100%;
  width: 100%;
}

#gisMap {
  height: 100%;
  width: 50%;
  background-color: green;
}

推荐答案

确保 initMap 函数在全局范围或作为回调传递给Google maps.js的参数命名空间正确时可见。
在你的情况下，最快的解决方案将被取代：

Make sure that initMap function is visible from the global scope or the parameter passed as callback to google maps.js is properly namespaced.In your case, the quickest solution will be replacing:

function initMap(){
//..
}

到：

to:

window.initMap = function(){
//...
}

或命名空间版本：

or namespace version:

<script src="https://maps.googleapis.com/maps/api/js?key=AIzaSyBDucSpoWkWGH6n05GpjFLorktAzT1CuEc&callback=YOUR.NAMESPACE.initMap" async defer></script>

//编辑：

我发现在你的代码片段中，你使用了一些异步模块加载（require.js？），并且你创建window.initMap函数的代码不会被执行，除非你调用包含这个声明的模块。所以你还没有完成我提到的第一个条件 - 在你调用google maps.js之前，initMap必须在全局范围内可见。

I see that in your code snippet you use some async module loading (require.js?) and the code in which you create window.initMap function does not get executed unless you call the module that contains this declaration. So you have not fulfilled the first condition that I've mentioned - the initMap must be visible from the global scope before you call google maps.js.

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