adi*_*din 8 javascript google-maps object google-maps-api-3
我Assertion failed: InvalidValueError: setMap: not an instance of Map; and not an instance of StreetViewPanorama在谷歌地图网页上收到错误.然后我在Stack Overflow上的其他地方读到这个问题,告诉我我需要一个google.maps.MAP对象的实例.我认为通过调用该对象来初始化我将调用该对象的地图.
以前,我收到错误,i is not defined所以我将createMarker函数移动到$.getJSON具有局部范围的函数中.
我需要在google.mapsMap其他地方打电话吗？
我究竟做错了什么？
HTML:
<body>
<h1 style="text-align: center;">Hello World</h1>
<div id="map"></div>
<ul id="list"></ul>
</body>
CSS:
#map {
height: 300px;
width: 600px;
border: 1px solid black;
margin: 0 auto;
}
JavaScript的:
function initialize(){
var mapProp = {
center: new google.maps.LatLng(38, -78),
zoom: 10,
mapTypeId: google.maps.MapTypeId.ROADMAP
};
var map = new google.maps.Map(document.getElementById('map'), mapProp);
};
$(document).ready(function(){
var url = 'https://opendata.howardcountymd.gov/resource/96q9-qbh7.json';
initialize();
$.getJSON(url, function (data){
$.each(data, function(i, field) {
$('#list').append("<li>" + data[i].location.longitude + " & " + data[i].location.latitude + "</li>");
createMarker(data);
function createMarker (data) {
var marker = new google.maps.Marker({
position: new google.maps.LatLng(data[i].location.latitude, data[i].location.longitude),
map: map,
title: field.crossroad
});
};
});
});
});
geo*_*zip 17
作为a实例的map变量是函数的google.maps.Map本地initialize变量.createMarker函数中的map变量未定义.一种选择:在全局范围内定义变量:
var map;
然后在initialize函数中初始化它:
function initialize(){
var mapProp = {
center: new google.maps.LatLng(38, -78),
zoom: 10,
mapTypeId: google.maps.MapTypeId.ROADMAP
};
map = new google.maps.Map(document.getElementById('map'), mapProp);
};
代码段:
var map;
function initialize() {
var mapProp = {
center: new google.maps.LatLng(38, -78),
zoom: 6,
mapTypeId: google.maps.MapTypeId.ROADMAP
};
map = new google.maps.Map(document.getElementById('map'), mapProp);
};
$(document).ready(function() {
var url = 'https://opendata.howardcountymd.gov/resource/96q9-qbh7.json';
initialize();
$.getJSON(url, function(data) {
$.each(data, function(i, field) {
$('#list').append("<li>" + data[i].location.longitude + " & " + data[i].location.latitude + "</li>");
createMarker(data);
function createMarker(data) {
var marker = new google.maps.Marker({
position: new google.maps.LatLng(data[i].location.latitude, data[i].location.longitude),
map: map,
title: field.crossroad
});
};
});
});
});#map {
height: 300px;
width: 600px;
border: 1px solid black;
margin: 0 auto;
}<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://maps.googleapis.com/maps/api/js"></script>
<h1 style="text-align: center;">Hello World</h1>
<div id="map"></div>
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