我將 Google Map API Directions 和 Places 結合在一起，我的目標是：
1.地理定位我的位置；
2.搜索附近的地方，在我下面的代碼中的“壽司”；
3.在地圖上創建標記；
4(1).每點擊一個標記，左側邊欄顯示該標記的關鍵資訊；
4（2）。并且有一條默認的藍色折線顯示我的位置和單擊的標記之間的路線；
5.下次單擊時路線會自行重繪 。
但是，我的問題是我制作的地圖中無法顯示默認的藍色折線。我檢查了控制臺，沒有錯誤，Direction API可以從我的代碼中得到回應。回應甚至包括默認藍色折線的代碼，但不知何故它從地圖上消失了。
代碼片段：
<!DOCTYPE html>
<html>
<head>
<title>Sushi Finder</title>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no">
<meta charset="utf-8">
<style>
/* Always set the map height explicitly to define the size of the div
* element that contains the map. */
#map {
height: 100%;
background-color: grey;
}
/* Optional: Makes the sample page fill the window. */
html,
body {
height: 100%;
margin: 0;
padding: 0;
}
/* TODO: Step 4A1: Make a generic sidebar */
/* Styling for an info pane that slides out from the left.
* Hidden by default. */
#panel {
height: 100%;
width: null;
background-color: white;
position: fixed;
z-index: 1;
overflow-x: hidden;
transition: all .2s ease-out;
}
.open {
width: 250px;
}
/* Styling for place details */
.hero {
width: 100%;
height: auto;
max-height: 166px;
display: block;
}
.place,
p {
font-family: 'open sans', arial, sans-serif;
padding-left: 18px;
padding-right: 18px;
}
.details {
color: darkslategrey;
}
a {
text-decoration: none;
color: cadetblue;
}
</style>
</head>
<body>
<!-- TODO: Step 4A2: Add a generic sidebar -->
<!-- The slide-out panel for showing place details -->
<div id="panel"></div>
<!-- Map appears here -->
<div id="map"></div>
<script>
/* Note: This example requires that you consent to location sharing when
* prompted by your browser. If you see the error "Geolocation permission
* denied.", it means you probably did not give permission for the browser * to locate you. */
let pos;
let map;
let bounds;
let infoWindow;
let currentInfoWindow;
let service;
let infoPane;
function initMap() {
// Initialize variables
directionsService = new google.maps.DirectionsService;
directionsDisplay = new google.maps.DirectionsRenderer({
map: map
});
bounds = new google.maps.LatLngBounds();
infoWindow = new google.maps.InfoWindow;
currentInfoWindow = infoWindow;
/* TODO: Step 4A3: Add a generic sidebar */
infoPane = document.getElementById('panel');
// Try HTML5 geolocation
if (navigator.geolocation) {
navigator.geolocation.getCurrentPosition(position => {
pos = {
lat: position.coords.latitude,
lng: position.coords.longitude
};
map = new google.maps.Map(document.getElementById('map'), {
center: pos,
zoom: 15
});
directionsDisplay.setMap(map);
bounds.extend(pos);
infoWindow.setPosition(pos);
infoWindow.setContent('Location found.');
infoWindow.open(map);
map.setCenter(pos);
// Call Places Nearby Search on user's location
getNearbyPlaces(pos);
}, () => {
// Browser supports geolocation, but user has denied permission
handleLocationError(true, infoWindow);
});
} else {
// Browser doesn't support geolocation
handleLocationError(false, infoWindow);
}
}
// Handle a geolocation error
function handleLocationError(browserHasGeolocation, infoWindow) {
// Set default location to Sydney, Australia
pos = { lat: -33.856, lng: 151.215 };
map = new google.maps.Map(document.getElementById('map'), {
center: pos,
zoom: 15
});
directionsDisplay.setMap(map);
// Display an InfoWindow at the map center
infoWindow.setPosition(pos);
infoWindow.setContent(browserHasGeolocation ?
'Geolocation permissions denied. Using default location.' :
'Error: Your browser doesn\'t support geolocation.');
infoWindow.open(map);
currentInfoWindow = infoWindow;
// Call Places Nearby Search on the default location
getNearbyPlaces(pos);
}
// Perform a Places Nearby Search Request
function getNearbyPlaces(position) {
let request = {
location: position,
rankBy: google.maps.places.RankBy.DISTANCE,
keyword: 'sushi'
};
service = new google.maps.places.PlacesService(map);
service.nearbySearch(request, nearbyCallback);
}
// Handle the results (up to 20) of the Nearby Search
function nearbyCallback(results, status) {
if (status == google.maps.places.PlacesServiceStatus.OK) {
createMarkers(results);
}
}
// Set markers at the location of each place result
function createMarkers(places) {
places.forEach(place => {
let marker = new google.maps.Marker({
position: place.geometry.location,
map: map,
title: place.name
});
/* TODO: Step 4B: Add click listeners to the markers */
// Add click listener to each marker
google.maps.event.addListener(marker, 'click', () => {
clicked = marker.getPosition();
let request = {
placeId: place.place_id,
fields: ['name', 'formatted_address', 'geometry', 'rating',
'website', 'photos']
};
console.log("marker " clicked.toUrlValue(6) " clicked")
calculateAndDisplayRoute(directionsService, directionsDisplay, pos, clicked);
console.log(clicked);
/* Only fetch the details of a place when the user clicks on a marker.
* If we fetch the details for all place results as soon as we get
* the search response, we will hit API rate limits. */
service.getDetails(request, (placeResult, status) => {
showDetails(placeResult, marker, status)
});
});
// Adjust the map bounds to include the location of this marker
bounds.extend(place.geometry.location);
});
/* Once all the markers have been placed, adjust the bounds of the map to
* show all the markers within the visible area. */
map.fitBounds(bounds);
}
function calculateAndDisplayRoute(directionsService, directionsDisplay, pos, clicked) {
directionsService.route({
origin: pos,
destination: clicked,
avoidTolls: true,
avoidHighways: false,
travelMode: google.maps.TravelMode.WALKING
}, function(response, status) {
console.log(response, status);
if (status == google.maps.DirectionsStatus.OK) {
console.log("directionsDisplay.getMap=" directionsDisplay.getMap());
directionsDisplay.setDirections(response);
} else {
window.alert('Directions request failed due to ' status);
}
});
}
/* TODO: Step 4C: Show place details in an info window */
// Builds an InfoWindow to display details above the marker
function showDetails(placeResult, marker, status) {
if (status == google.maps.places.PlacesServiceStatus.OK) {
let placeInfowindow = new google.maps.InfoWindow();
let rating = "None";
if (placeResult.rating) rating = placeResult.rating;
placeInfowindow.setContent('<div><strong>' placeResult.name
'</strong><br>' 'Rating: ' rating '</div>');
placeInfowindow.open(marker.map, marker);
currentInfoWindow.close();
currentInfoWindow = placeInfowindow;
showPanel(placeResult);
} else {
console.log('showDetails failed: ' status);
}
}
/* TODO: Step 4D: Load place details in a sidebar */
// Displays place details in a sidebar
function showPanel(placeResult) {
// If infoPane is already open, close it
if (infoPane.classList.contains("open")) {
infoPane.classList.remove("open");
}
// Clear the previous details
while (infoPane.lastChild) {
infoPane.removeChild(infoPane.lastChild);
}
/* TODO: Step 4E: Display a Place Photo with the Place Details */
// Add the primary photo, if there is one
if (placeResult.photos) {
let firstPhoto = placeResult.photos[0];
let photo = document.createElement('img');
photo.classList.add('hero');
photo.src = firstPhoto.getUrl();
infoPane.appendChild(photo);
}
// Add place details with text formatting
let name = document.createElement('h1');
name.classList.add('place');
name.textContent = placeResult.name;
infoPane.appendChild(name);
if (placeResult.rating) {
let rating = document.createElement('p');
rating.classList.add('details');
rating.textContent = `Rating: ${placeResult.rating} \u272e`;
infoPane.appendChild(rating);
}
let address = document.createElement('p');
address.classList.add('details');
address.textContent = placeResult.formatted_address;
infoPane.appendChild(address);
if (placeResult.website) {
let websitePara = document.createElement('p');
let websiteLink = document.createElement('a');
let websiteUrl = document.createTextNode(placeResult.website);
websiteLink.appendChild(websiteUrl);
websiteLink.title = placeResult.website;
websiteLink.href = placeResult.website;
websitePara.appendChild(websiteLink);
infoPane.appendChild(websitePara);
}
// Open the infoPane
infoPane.classList.add("open");
}
</script>
<script async defer src="https://maps.googleapis.com/maps/api/js?key=AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qk&libraries=places&callback=initMap">
</script>
</body>
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標籤：javascript html 谷歌地图 地理位置
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