使用Google Maps API v3,是否可以获取最初打开地图时显示的旅行时间?
this link有一个示例,说明如何在行驶模式之间切换。我知道如何设置addEventListener
来监听input
change
,然后显示行驶时间,但是我想显示首次打开/加载地图时的行驶时间。 / p>
我正在模式窗口中打开地图。
当我更改输入但最初未打开时,以下JQuery起作用。它可以在第二次打开。
$('#travelTime').html('Est. travel time: ' +travelTime);
下面的代码有效,尽管它不包含模式。
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no">
<meta charset="utf-8">
<title>Travel Modes in Directions</title>
<style>
#map {
height: 100%;
}
html, body {
height: 100%;
margin: 0;
padding: 0;
}
#floating-panel {
position: absolute;
top: 10px;
left: 25%;
z-index: 5;
background-color: #fff;
padding: 5px;
border: 1px solid #999;
text-align: center;
font-family: 'Roboto','sans-serif';
line-height: 30px;
padding-left: 10px;
}
</style>
</head>
<body>
<div id="floating-panel">
<b>Mode of Travel: </b>
<select id="mode">
<option value="DRIVING">Driving</option>
<option value="WALKING">Walking</option>
<option value="BICYCLING">Bicycling</option>
<option value="TRANSIT">Transit</option>
</select>
</div>
<p id="travelTime"></p> <!-- display time here -->
<div id="map"></div>
<script>
function initMap() {
var directionsDisplay = new google.maps.DirectionsRenderer;
var directionsService = new google.maps.DirectionsService;
var map = new google.maps.Map(document.getElementById('map'), {
zoom: 14,
center: {lat: 37.77, lng: -122.447}
});
directionsDisplay.setMap(map);
calculateAndDisplayRoute(directionsService, directionsDisplay);
document.getElementById('mode').addEventListener('change', function() {
calculateAndDisplayRoute(directionsService, directionsDisplay);
});
}
function calculateAndDisplayRoute(directionsService, directionsDisplay) {
var selectedMode = document.getElementById('mode').value;
directionsService.route({
origin: {lat: 37.77, lng: -122.447},
destination: {lat: 37.768, lng: -122.511},
travelMode: google.maps.TravelMode[selectedMode]
}, function(response, status) {
if (status == 'OK') {
directionsDisplay.setDirections(response);
travelTime = response.routes[0].legs[0].distance.text; // contains correct value
} else {
window.alert('Directions request failed due to ' + status);
}
});
}
</script>
<script async defer
src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap">
</script>
</body>
</html>
答案 0 :(得分:1)
在打开模式之前初始化地图。
在页面加载时添加initMap()
。