我使用Google Maps API构建了一个地图，该地图将根据其来自＆＃39; whereNew.js＆＃39;的纬度和经度来绘制点数。使用标记，其颜色将取决于来自＆＃39; MarketData.js＆＃39;的另一个参数。 。点击标记后，它会显示一个带有按钮的信息窗口 - ＆＃34;显示路线＆＃34;以及一些基于＆＃39; MarketData.js＆＃39;的信息。到目前为止，代码已成功执行。
此后，当＆＃34;显示路线＆＃34;点击任意标记的按钮，我希望Google Maps API显示来自＆＃39; MarketData.js＆＃34;的第7列的每个位置的所有路线。到那个标记。但是，当我点击该按钮时，它会出现此错误：
未捕获的TypeError：无法读取属性＆＃39; setDirections＆＃39;未定义的 whereNewTest1.html：176
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>
<div id="map_canvas" style="height: 600px"></div>
<script src="whereNew.js"></script>
<script src="marketData.js"></script>
<script>
var directionsDisplay;
var directionsService = new google.maps.DirectionsService();
var directionsDisplay = new google.maps.DirectionsRenderer(
{
map: map
});
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 directionsService = new google.maps.DirectionsService;
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(' + i + ')">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(i)
{
/* for (var i = 0; i < markerArray.length; i++)
{
markerArray[i].setMap(null);
} */
//for (pos in MarketInfo)
//{
var directionsService = new google.maps.DirectionsService();
var row = MarketInfo[i];
// Second loop for multiple destination
var str_array = row[6].split(',');
for (var j = 0; j < str_array.length; j++)
{
directionsService.route(
{
origin: str_array[j],
destination: row[1],
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
});*/
directionsDisplay.setDirections(response);
}else
{
window.alert('Directions request failed due to ' + status);
}
});
}
//}
}
</script>
<body onload="initialize()">
<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)
在定义directionsDisplay时出错。
您应该在directionsDisplay函数中定义initialize，并在定义map之前定义directionsDisplay，如下所示：
function initialize()
{
var map = new google.maps.Map(document.getElementById('map_canvas'), mapOptions);
var directionsDisplay = new google.maps.DirectionsRenderer(
{
map: map
});
.
.
.
}