我创建了几个使用Google距离的网页。我为Google提供了javascript和HTML的示例代码,并根据我的目的对其进行了调整。他们似乎说我需要一个API密钥来使用该服务,但没有它我的页面工作正常。首先,当我希望每天有几百个请求时,使用API密钥是必不可少的。如果必要,我在哪里将API密钥放在Google提供的以下示例代码中?
function initialize() {
var opts = {
center: new google.maps.LatLng(55.53, 9.4),
zoom: 10
};
map = new google.maps.Map(document.getElementById('map-canvas'), opts);
geocoder = new google.maps.Geocoder();
}
function calculateDistances() {
var service = new google.maps.DistanceMatrixService();
service.getDistanceMatrix(
{
//origins: [origin1, origin2],
origins: [origin2],
//destinations: [destinationA, destinationB],
destinations,
travelMode: google.maps.TravelMode.DRIVING,
unitSystem: google.maps.UnitSystem.METRIC,
avoidHighways: false,
avoidTolls: false
}, callback);
}
function callback(response, status) {
if (status != google.maps.DistanceMatrixStatus.OK) {
alert('Error was: ' + status);
} else {
var origins = response.originAddresses;
var destinations = response.destinationAddresses;
var outputDiv = document.getElementById('outputDiv');
outputDiv.innerHTML = '';
deleteOverlays();
for (var i = 0; i < origins.length; i++) {
var results = response.rows[i].elements;
addMarker(origins[i], false);
for (var j = 0; j < results.length; j++) {
addMarker(destinations[j], true);
outputDiv.innerHTML += origins[i] + ' to ' + destinations[j]
+ ': ' + results[j].distance.text + ' in '
+ results[j].duration.text + '<br>';
}
}
}
}
function addMarker(location, isDestination) {
var icon;
if (isDestination) {
icon = destinationIcon;
} else {
icon = originIcon;
}
geocoder.geocode({'address': location}, function(results, status) {
if (status == google.maps.GeocoderStatus.OK) {
bounds.extend(results[0].geometry.location);
map.fitBounds(bounds);
var marker = new google.maps.Marker({
map: map,
position: results[0].geometry.location,
icon: icon
});
markersArray.push(marker);
} else {
alert('Geocode was not successful for the following reason: '
+ status);
}
});
}
function deleteOverlays() {
for (var i = 0; i < markersArray.length; i++) {
markersArray[i].setMap(null);
}
markersArray = [];
}
google.maps.event.addDomListener(window, 'load', initialize);
</script>
</head>
<body>
<div id="content-pane">
<div id="inputs">
<pre>
var origin1 = new google.maps.LatLng(55.930, -3.118);
var origin2 = 'Greenwich, England';
var destinationA = 'Stockholm, Sweden';
var destinationB = new google.maps.LatLng(50.087, 14.421);
</pre>
<p><button type="button" onclick="calculateDistances();">Calculate
distances</button></p>
</div>
<div id="outputDiv"></div>
</div>
<div id="map-canvas"></div>
</body>
答案 0 :(得分:0)
我知道没有显式方法将Google地图API密钥插入JavaScript代码(我想你想这样做)。
执行此操作的一般方法是使用标准javascript标记引用密钥,并将其放在 src 属性中。
示例:
<script>
src="https://maps.googleapis.com/maps/api/js?key=123456ABCDEFG&sensor=false"
</script>
由于您使用 DomListener 呼叫您的Google地图,上面的示例调用API密钥是要走的路,除此之外您还可以通过使用此行来调用您的Google地图功能代码总是显示在谷歌地图官方文档中:
<script async defer
src="https://maps.googleapis.com/maps/api/js?key=API_KEY&callback=initialize">
</script>
async关键字意味着HTML(网页)不必等待Google Maps API响应才能呈现。基本上,HTML(除了谷歌地图)渲染,然后当实际地图准备好时,它将加载。如果选择此选项,则擦除 DomListener 代码行。
其余的可以在谷歌地图的官方页面找到
网址:https://developers.google.com/maps/documentation/javascript/tutorial#api_key