Google地图错误:a为空 [英] Google map error: a is null
问题描述
我有一个程序,我想使用谷歌地图。问题是我得到一个错误,说a是null,其中a是谷歌地图API中使用的一个变量。以下是我称之为谷歌地图的方式:
//为Google地图创建新的中心位置
var latlng = new google.maps.LatLng(centerLatitude,centerLongitude);
//谷歌地图的选项
var myOptions = {
zoom:7,
maxZoom:12,
center:latlng,
mapTypeId:google.maps.MapTypeId.ROADMAP
};
//创建新地图
var map = new google.maps.Map(document.getElementById(map_canvas),myOptions);
以下是我的HTML标签的样子:
< div id =map_canvas>< / div>
我通过url获取页面加载的lat和lng。这些值正确传递,所以我知道这不是问题。我认为它必须处理 var map = new google.maps.Map(document.getElementById(map_canvas),myOptions);
不正确。任何建议?
编辑:这里是错误信息:
a是
fromLatLngToPoint(a = null)
yg(a = null,b = Object {zoom = 7,maxZoom = 12,more ...})
d(d = Document Default.aspx (a){a(a = undefined)
d()
[Break On This Error]函数Qf(a){a = af [9]; return a!= i?a:...);函数sg(a){a [ic]& a [ic] Vb}
确保您指定保存地图的元素的大小。例如:
< div id =map_canvasstyle =width:500px; height:500px;><<< ; / DIV>
还要确保您的地图变量是在全局范围内定义的,并且
初始化映射一旦DOM被加载。
I have a program that I want to use google maps for. The problem is I get an error that says a is null where a is a var used in the google map api. Here is how I call my google map:
//Creates a new center location for the google map
var latlng = new google.maps.LatLng(centerLatitude, centerLongitude);
//The options for the google map
var myOptions = {
zoom: 7,
maxZoom: 12,
center: latlng,
mapTypeId: google.maps.MapTypeId.ROADMAP
};
//Creates the new map
var map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);
And here is what my HTML tag looks like:
<div id = "map_canvas"></div>
I get the lat and lng on page load through the url. These values are passed in correctly so I know that is not the problem. I think that it has to do with the var map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);
not being correct. Any suggestions?
EDIT: Here is the error message:
a is null fromLatLngToPoint(a=null) yg(a=null, b=Object { zoom=7, maxZoom=12, more...}) d(d=Document Default.aspx?lat=30.346317&lng=105.46313, f=[function()]) d(a=undefined) d() [Break On This Error] function Qf(a){a=a.f[9];return a!=i?a:...);function sg(a){a[ic]&&a[ic]Vb}
Make sure you specify the size of the element that holds the map. For example:
<div id="map_canvas" style="width: 500px; height: 500px;"></div>
Also make sure your map variable is defined in the global scope and that you initialize the map once the DOM is loaded.
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