【发布时间】：2018-04-05 16:35:41
【问题描述】：
我正在学习一个涉及 GoogleMaps API JS 的教程，一切顺利。在尝试构建自己的应用程序时，我遇到了显示路线的问题。我正在开发的应用程序主要是用 ruby on rails 编写的。
“伪代码”问题是单击“查看路线”按钮时，路线未显示在地图上。
下面是点击搜索按钮时触发第一个事件的 HTML，以及请求的 CSS。
<body>
<div>
<span class="text"> Within </span>
<select id='max-duration'>
<option value="10">10 min</option>
</select>
<select id="mode">
<option value="DRIVING">drive</option>
</select>
<span class="text">of</span>
<input id= 'search-within-time-text' type='text' placeholder='Your Location'>
<input id= 'search-within-time' type='button' value='Go'>
</div>
<div id="map"></div>
<script src="https://maps.googleapis.com/maps/api/js?libraries=places,drawing,geometry&key=<%= ENV["MAP_API"] %>&v=3"></script>
</body>
<style>
#map {
bottom: 0px;
height: 500px;
left: 362px;
position: absolute;
right: 0px;
}
.container {
height: 500px;
position: relative;
}
.options-box {
background: #fff;
border: 1px solid black;
height: 91.75%;
line-height: 35px;
padding: 10px 10px 30px 10px;
text-align: left;
width: 340px;
}
#zoom-to-area-text{
width:200px;
}
</style>
在地图控制器中可以找到存储数据的位置数组，我们正在从我们的 SQLite DB 推送数据。
def index
@test_array = []
@test.each do |h|
@test_array.push({lat: h.lat, lng: h.lng})
end
end
我认为问题出在函数 displayDirections 中。可以在完整代码的底部找到
displayDirections 函数是在 initMap 函数之外编写的，因为在 initMap 函数内部编写时存在范围问题。我已经阅读了下面的问题
但是在单击事件中定义 displayDirections 时遇到了问题，当它在 initMap 函数中写入时，在函数 displayMarkersWithinTime 中。
感谢任何帮助！谢谢！
function initMap() {
var map;
var markers = [];
var placeMarkers = [];
document.getElementById('search-within-time').addEventListener('click', function(){
searchWithinTime();
});
map = new google.maps.Map(document.getElementById('map'), {
center: {lat: 39.9523789, lng: -75.1635996},
zoom: 13,
mapTypeControl: false
});
var locations = <%= raw @test_array.to_json%>
for (var i = 0; i < locations.length; i++) {
var position = locations[i]
var marker = new google.maps.Marker({
position: position,
animation: google.maps.Animation.DROP,
id: i
});
markers.push(marker);
}
function hideMarkers(markers) {
for (var i = 0; i < markers.length; i++){
markers[i].setMap(null);
}
}
function searchWithinTime(){
var distanceMatrixService = new google.maps.DistanceMatrixService;
var address = document.getElementById('search-within-time-text').value;
if (address == ''){
window.alert('You must enter an address.');
} else {
hideMarkers(markers);
var origins = [];
for (var i = 0; i < markers.length; i++) {
origins[i] = markers[i].position;
}
var destination = address;
var mode = document.getElementById('mode').value;
distanceMatrixService.getDistanceMatrix({
origins: origins,
destinations: [destination],
travelMode: google.maps.TravelMode[mode],
unitSystem: google.maps.UnitSystem.IMPERIAL,
}, function(response, status) {
if (status !== google.maps.DistanceMatrixStatus.OK) {
window.alert('Error was: ' + status);
} else {
displayMarkersWithinTime(response);
}
});
}
}
function displayMarkersWithinTime(response){
var maxDuration = document.getElementById('max-duration').value;
var origins = response.originAddresses;
var destinations = response.destinationAddresses;
var atLeastOne = false;
for (var i = 0; i < origins.length; i++) {
var results = response.rows[i].elements;
for (var j = 0; j < results.length; j++) {
var element = results[j];
if (element.status === "OK") {
var distanceText = element.distance.text;
var duration = element.duration.value / 60;
var durationText = element.duration.text;
if (duration <= maxDuration) {
markers[i].setMap(map);
atLeastOne = true;
var infowindow = new google.maps.InfoWindow({
content : durationText + ' away, ' + distanceText + '<div><input type=\"button\" value=\"View Route\" onclick =' + '\"displayDirections("' + origins[i] + '");\"</input></div>'
});
infowindow.open(map, markers[i]);
// if user clicks on marker close the small info window to open a new
markers[i].infowindow = infowindow;
google.maps.event.addListener(markers[i], 'click', function (){
this.infowindow.close();
});
}
}
}
}
if(!atLeastOne) {
window.alert('We could not find any locations within that distance');
}
console.log("hello")
}
}
var map;
var markers = [];
map = new google.maps.Map(document.getElementById('map'), {
center: {lat: 39.9523789, lng: -75.1635996},
zoom: 13,
mapTypeControl: false
});
function hideMarkers(markers) {
for (var i = 0; i < markers.length; i++){
markers[i].setMap(null);
}
}
function displayDirections(origin) {
hideMarkers(markers);
var directionsService = new google.maps.DirectionsService;
var destinationAddress = document.getElementById('search-within-time-text').value;
var mode = document.getElementById('mode').value;
directionsService.route({
origin: origin,
destination: destinationAddress,
travelMode: google.maps.TravelMode[mode]
}, function(response, status) {
console.log(response)
console.log(status)
if (status === google.maps.DirectionsStatus.OK) {
var directionsDisplay = new google.maps.DirectionsRenderer({
map: map,
directions: response,
draggable: true,
polylineOptions: {
strokeColor: 'black'
}
}, console.log(map), console.log(response));
} else {
window.alert('Directions request failed due to ' + status);
}
});
console.log("testing")
}
google.maps.event.addDomListener(window, initMap())
【问题讨论】：
标签： javascript google-maps google-maps-api-3