我使用Google Maps API构建了一个地图，该地图将根据“whereNew.js”的纬度和经度绘制点，其标记的颜色将取决于“MarketData.js”中的另一个参数。单击标记时，它将显示一个带有按钮的信息窗口 - “显示路径”和一些基于“MarketData.js”的信息。到目前为止，代码已成功执行。
在此之后，当点击任何标记的“显示路线”按钮时，我希望Google Maps API显示从第8列“MarketData.js”的每个位置到该标记的所有路线。但是，当我点击该按钮，它会出现此错误：
未捕获的TypeError：无法在calculateAndDisplayRoute中读取未定义的属性“route”
whereNewTest1.html：162
我不明白我做错了什么。请帮忙
whereNewTest1.html
<html>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no">
<meta charset="utf-8">
<title>Markets of Kolkata</title>
<style>
#map {
height: 100%;
}
/* Optional: Makes the sample page fill the window. */
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;
}
#warnings-panel {
width: 100%;
height: 10%;
text-align: center;
}
</style>
<link href="http://google-developers.appspot.com/maps/documentation/javascript/examples/default.css" rel="stylesheet">
<!-- If you are in China, you may need to use theis site for the Google Maps code
<script src="http://maps.google.cn/maps/api/js" type="text/javascript"></script> -->
<!--<script src="http://maps.googleapis.com/maps/api/js?sensor=false"></script> -->
<!-- <script async defer src=
"https://maps.googleapis.com/maps/api/js?libraries=geometry,drawing&key=AIzaSyDrdSH53E0MRIfajUGZQiFHAB0aLfzFIVU&v=3&v=3&callback=displayDirections"></script>
</script> -->
<script async defer src="https://maps.googleapis.com/maps/api/js?key=AIzaSyBbXta5ppMyzPmTCGNsyP-djMlSOGJ9t9o&callback=initialize">
</script>
<script src="whereNew.js"></script>
<script src="marketData.js"></script>
<script>
var directionsDisplay;
var directionsService = new google.maps.DirectionsService();
var map;
var markerArray = [];
var dest ;
function initialize()
{
//alert("To see the title of a marker, hover over the marker but don't click.");
var myLatlng = new google.maps.LatLng(22.39361,88.099263)
var mapOptions = {
zoom: 3,
center: myLatlng,
mapTypeId: google.maps.MapTypeId.ROADMAP
}
var markerArray = [];
var directionsService = new google.maps.DirectionsService;
var directionsDisplay = new google.maps.DirectionsRenderer(
{
map: map
});
var map = new google.maps.Map(document.getElementById('map_canvas'), mapOptions);
i = 0;
var markers = [];
for ( pos in myData )
{
var row = myData[pos];
var row1 = MarketInfo[i];
window.console && console.log(row) && console.log(row1);
// if ( i < 3 ) { alert(row); }
var newLatlng = new google.maps.LatLng(row[0], row[1]);
var marker = new google.maps.Marker(
{
position: newLatlng,
map: map,
title: row[3],
});
var infowindow = new google.maps.InfoWindow({ });
var largeInfowindow = new google.maps.InfoWindow({ });
dest = row1[1];
var content = row1[2] + '<br/><button onclick = "calculateAndDisplayRoute(directionsDisplay, directionsService, markerArray, map, dest);">Show Routes</button>';
if((content.search("WHOLESALE"))>-1)
{
marker.setIcon('http://maps.google.com/mapfiles/ms/icons/red-dot.png');
}
else if((content.search("WHOLE SALE"))>-1)
{
marker.setIcon('http://maps.google.com/mapfiles/ms/icons/red-dot.png');
}
else if((content.search("MAJOR"))>-1)
{
marker.setIcon('http://maps.google.com/mapfiles/ms/icons/blue-dot.png');
}
else
{
marker.setIcon('http://maps.google.com/mapfiles/ms/icons/green-dot.png');
}
google.maps.event.addListener(marker,'click', (function(marker,content,infowindow)
{
return function()
{
infowindow.setContent(content);
infowindow.open(map,marker);
};
})(marker,content,infowindow));
markers.push(marker);
i = i + 1;
}
function populateInfoWindow(marker, infowindow)
{
if(infowindow.marker != marker)
{
infowindow.marker = marker;
infowindow.setContent('<div>'+infowindow.content+'</div>');
infowindow.open(map, marker);
infowindow.addListener('closeclick', function(){
infowindow.setMarker(null);
});
}
}
}
function calculateAndDisplayRoute(directionsDisplay, directionsService, markerArray, map, dest)
{
for (var i = 0; i < markerArray.length; i++)
{
markerArray[i].setMap(null);
}
for (pos in MarketInfo)
{
var row = MarketInfo[pos];
// Second loop for multiple destination
var str_array = row[7].split(',');
for (var j = 0; j < str_array.length; j++)
{
directionsService.route(
{
origin: str_array[j],
destination: dest,
travelMode: 'DRIVING'
}, function(response, status) {
if (status === 'OK')
{
document.getElementById('warnings-panel').innerHTML = '<b>' + response.routes[0].warnings + '</b>';
var dirDisplay = new google.maps.DirectionsRenderer({
map: map
});
dirDisplay.setDirections(response);
}else
{
window.alert('Directions request failed due to ' + status);
}
});
}
}
}
</script>
<body onload="initialize()">
<div id="map_canvas" style="height: 600px"></div>
<p>
<b>Developed by</b>
<a href="http://www.linkedin.com/in/arnab-chakravarty-8a329111b?trk=nav_responsive_tab_profile"><b>Arnab Chakravarty</b></a>.
</p>
</body>
</html>
whereNew.js
myData = [
[22.5193768,88.3656851, 'K.M.C. Market, 3rd Floor Market Complex, 212, Rash Behari Avenue Road, Hindustan Park, Gariahat, Kolkata, West Bengal 700019, India', 'PAL BAZAR'],
[22.4977887,88.3796042, 'Garfa Main Rd, Kolkata, West Bengal 700075, India', 'RAMLAL BAZAR'],
[22.5048463,88.3882325, 'Purbachal Main Rd, Ramlal Bazar, Haltu, Kolkata, West Bengal 700078, India', 'COLLEGE STREET MARKET ( SPORTS GOODS)']
];
MarketData.js
MarketInfo = [
["GARIAHAT KMC MARKET", "K.M.C. Market, 3rd Floor Market Complex, 212, Rash Behari Avenue Road, Hindustan Park, Gariahat, Kolkata- 700019", "MAJOR (1400SHOP + HOWKER)", "FRUITS, VEGETABLES, FLOWER, FISH, MEAT, GROCERY, CLOTHING, FURNITURE , HOUSEHOLD, FOOTWEAR ELECTRICAL ETC", "", "", "BARABAZAR, KOLEYMART", "HOWRAH", "We collect the goods ourselves", "", "MANY", "Cars, Light goods vehicles (LGV), Heavy goods vehicles/lorries (HGV)", "Within one hour", "", "", "No problems encountered", "", "IF A UNLOADING SPACE CAN PROVIDE BY GOVT. IT WILL BE BETTER"],
["PAL BAZAR", "GARIFA MAIN ROAD, KOLKATA - 700 075", "MINOR (150SHOP + 70HOWKERS)", "FRESH, COOL AND FROZEN PRODUCT, OTHER TYPE OF CONSUMER GOODS, TEXTILE,FOOTWEAR, ELECTRONIC AND ELECTRICAL EQUIPMENT, BUILDING MATERIALS", "", "SANDHYA BAZAR", "BARA BAZAR, CHADNI CHOWK", "", "The goods are delivered by multiple suppliers", "MANY", "10 TO 20", "Bicycles/tricycles/carts, Motorised two/three-wheelers", "Within one hour", "", "", "Delivery vehicle causes traffic jams in front of the establishment", "", ""],
["RAMLAL BAZAR", "Purbachal Main Rd, Ramlal Bazar, Haltu. Kolkata-700078", "MINOR (150 SHOP+ 180 HOWKERS)", "FRUITS, VEGETABLE, FISH, MEAT, GROCERY, TEXTILE, ELECTRICAL, BUILDING MATERIALS ETC", "", "BAGHAJATIN AND SANDHYA BAZAR", "BARA BAZAR, EZRA ST.", "", "We collect the goods ourselves", "", "MANY", "Bicycles/tricycles/carts, Motorised two/three-wheelers, Light goods vehicles (LGV)", "Within one hour", "", "", "Limited storage space available, Delivery vehicle causes traffic jams in front of the establishment, High delivery costs", "", "PARKING PLACE REQUIRE"]
];
答案 0 :(得分：1)
问题在于这行代码
var content = row1[2] + '<br/><button onclick = calculateAndDisplayRoute(directionsDisplay, directionsService, markerArray, map, row1[1]);>Show Routes</button>';
onclick需要双引号中的函数名称
由于您是以字符串形式创建HTML，因此不会捕获您传递的参数。您可以尝试使用全局变量并查看结果。
编辑：
我对代码进行了以下更改
在initialize函数之外声明全局变量：
var directionsDisplay;
var directionsService = new google.maps.DirectionsService();
var map;
var markerArray = [];
function initialize() {
将错误行更改为：
var content = row1[2] + '<br/><button onclick="calculateAndDisplayRoute(' + i + ')">Show Routes</button>';
注意，我正在发送行标识符（i）。我已删除所有其他参数。
calculateAndDisplayRoute的签名是：
function calculateAndDisplayRoute(i) {
var destination1 = MarketInfo[i][1];
...
}