从数据库中选择记录并在地图上设置动画。我在firebug控制台中遇到 TypeError ，我找不到导致错误的原因。没有绘制标记并且没有动画发生。 makeRouteCallback 函数出现错误。
使用console.log（）显示rNum具有正确的值0,1,2,3,4。
错误
TypeError: polyline[rNum] is undefined
polyline[rNum].setMap(map);
我还在 makeRouteCallback 函数中为'status'做了一个console.log，它打印了NOT_FOUND而不是OK
代码
<%@ include file="/WEB-INF/jsp/include.jsp" %>
<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %>
<%@ taglib prefix = "fmt" uri= "http://java.sun.com/jsp/jstl/fmt" %>
<%@ taglib prefix = "c" uri= "http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
<link href="<c:url value="/resources/css/crimeTrackMap.css" />" rel="stylesheet" type="text/css" media="screen" />
<script type="text/javascript" src="http://maps.googleapis.com/maps/api/js?key=AIzaSyAuJC5ega61cLlvCB14uKxoheUmh61Wwmc&sensor=true"></script>
<script src="/crimeTrack/resources/js/markermanager.js"></script>
<script src="/crimeTrack/resources/js/v3_epoly.js"></script>
<script src="/crimeTrack/resources/js/jquery-1.9.1.js"></script>
<script src="http://code.jquery.com/jquery-1.9.0.js"></script>
<script src="http://code.jquery.com/jquery-migrate-1.0.0.js"></script>
<script type="text/javascript">
var map;
var directionDisplay;
var directionsService;
var stepDisplay;
var position;
var marker = [];
var polyline = [];
var poly = [];
var poly2 = [];
var startLocation = [];
var endLocation = [];
var timerHandle = [];
var speed = 0.000005, wait = 1;
var infowindow = null;
var myPano;
var panoClient;
var nextPanoId;
var global_citizens = new Array();
var Colors = ["#FF0000", "#00FF00", "#0000FF"];
//------------------------------------------------------------
function GetCitizensForTracking(){
$.ajax({
type: 'GET',
async : false,
global: 'false',
url: 'getListOfMarkers.htm',
headers : {Accept: 'application/json'},
dataType: 'json'
}).done(function(citizens) {
global_citizens = citizens;
$.each(citizens, function(i, c) {
//console.log(c.name + ' | ' + c.socialSecurityNumber + ' | ' + c.lat+ ' | ' +c.lng);
//citizen.push(c.name);
console.log(global_citizens[i].name+','+global_citizens[i].citizenType);
});
});
}
//---------------------------------------------------------------------
function initialize() {
infowindow = new google.maps.InfoWindow(
{
size: new google.maps.Size(150,50)
});
var myOptions = {
zoom: 11,
mapTypeId: google.maps.MapTypeId.ROADMAP
}
map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);
address = 'Trinidad and Tobago'
geocoder = new google.maps.Geocoder();
geocoder.geocode( { 'address': address}, function(results, status) {
map.fitBounds(results[0].geometry.viewport);
});
}
//------------------------------------------------------------------------------
function createMarker(latlng, label, html,citizenType) {
var contentString = '<b>'+label+'</b><br>'+html;
//console.log('Citizen icon is '+citizenType);
//replaces if...then..else...else if. Icon source are placed in an array that corresponds to value of the citizenType.
//array starts from 0 . The first value of the citizens type is 2 so array should have a value at the 2 location
//so jquery will map the icon to the citizenType based on its matching location in the array
var markerSource = [null,
null,
'resources/icons/criminal_new.ico',
'resources/icons/victim_new.ico',
'resources/icons/suspect_new.ico'];
var icon = markerSource[citizenType];
var marker = new google.maps.Marker({
position: latlng,
map: map,
title: label,
icon: new google.maps.MarkerImage(icon),
zIndex: Math.round(latlng.lat()*-100000)<<5
});
marker.myname = label;
google.maps.event.addListener(marker, 'click', function() {
infowindow.setContent(contentString);
infowindow.open(map,marker);
});
return marker;
}
//---------------------------------------------------------------------------------
function setRoutes(){
var directionsDisplay = new Array();
for (var i=0; i< global_citizens.length; i++){
var rendererOptions = {
map: map,
suppressMarkers : true,
preserveViewport: true
}
directionsService = new google.maps.DirectionsService();
var travelMode = google.maps.DirectionsTravelMode.DRIVING;
var request = {
origin: global_citizens[i].startLat+','+global_citizens[i].startLng,
destination: global_citizens[i].endLat+','+global_citizens[i].endLng,
travelMode: travelMode
};
directionsService.route(request,makeRouteCallback(i,directionsDisplay[i],global_citizens[i].citizenType));
console.log("Set Routes "+global_citizens[i].name +' - '+global_citizens[i].citizenType);
}
//------------------------------------------------------------------------------------
function makeRouteCallback(rNum, disp,ctype){
if (polyline[rNum] && (polyline[rNum].getMap() != null)) {
startAnimation(rNum);
return;
}
return function(response, status){
if (status == google.maps.DirectionsStatus.OK){
var bounds = new google.maps.LatLngBounds();
var route = response.routes[0];
startLocation[rNum] = new Object();
endLocation[rNum] = new Object();
polyline[rNum] = new google.maps.Polyline({
path: [],
strokeColor: '#FFFF00',
strokeWeight: 3
});
poly2[rNum] = new google.maps.Polyline({
path: [],
strokeColor: '#FFFF00',
strokeWeight: 3
});
// For each route, display summary information.
var path = response.routes[0].overview_path;
var legs = response.routes[0].legs;
disp = new google.maps.DirectionsRenderer(rendererOptions);
disp.setMap(map);
disp.setDirections(response);
//Markers
for (i=0;i<legs.length;i++) {
if (i == 0) {
startLocation[rNum].latlng = legs[i].start_location;
startLocation[rNum].address = legs[i].start_address;
// marker = google.maps.Marker({map:map,position: startLocation.latlng});
//console.log('(i) The Citizen Type Is : '+ global_citizens[i].citizenType);
marker[rNum] = createMarker(legs[i].start_location,"start",legs[i].start_address,ctype);
}
endLocation[rNum].latlng = legs[i].end_location;
endLocation[rNum].address = legs[i].end_address;
var steps = legs[i].steps;
for (j=0;j<steps.length;j++) {
var nextSegment = steps[j].path;
var nextSegment = steps[j].path;
for (k=0;k<nextSegment.length;k++) {
polyline[rNum].getPath().push(nextSegment[k]);
//bounds.extend(nextSegment[k]);
}
}
}
}
polyline[rNum].setMap(map);
//map.fitBounds(bounds);
startAnimation(rNum);
}
}
}
var lastVertex = 1;
var stepnum=0;
var step = 90; //0.9 metres
var tick = 100; // milliseconds
var eol = [];
//----------------------------------------------------------------------
function updatePoly(i,d) {
// Spawn a new poly line every 20 vertices, because updating a 100-vertex poly is too slow
if (poly2[i].getPath().getLength() > 20) {
poly2[i]=new google.maps.Polyline([polyline[i].getPath().getAt(lastVertex-1)]);
// map.addOverlay(poly2)
}
if (polyline[i].GetIndexAtDistance(d) < lastVertex+2) {
if (poly2[i].getPath().getLength()>1) {
poly2[i].getPath().removeAt(poly2[i].getPath().getLength()-1)
}
poly2[i].getPath().insertAt(poly2[i].getPath().getLength(),polyline[i].GetPointAtDistance(d));
} else {
poly2[i].getPath().insertAt(poly2[i].getPath().getLength(),endLocation[i].latlng);
}
}
//----------------------------------------------------------------------------
function animate(index,d) {
if (d>eol[index]) {
marker[index].setPosition(endLocation[index].latlng);
return;
}
var p = polyline[index].GetPointAtDistance(d);
//map.panTo(p);
marker[index].setPosition(p);
updatePoly(index,d);
timerHandle[index] = setTimeout("animate("+index+","+(d+step)+")", tick);
if(marker[0].getPosition() == endLocation[0].latlng){
console.log('Completed');
//alert("Marker One Complete");
}
}
//-------------------------------------------------------------------------
function startAnimation(index) {
if (timerHandle[index]) clearTimeout(timerHandle[index]);
eol[index]=polyline[index].Distance();
map.setCenter(polyline[index].getPath().getAt(0));
poly2[index] = new google.maps.Polyline({path: [polyline[index].getPath().getAt(0)], strokeColor:"#FFFF00", strokeWeight:3});
timerHandle[index] = setTimeout("animate("+index+",50)",2000); // Allow time for the initial map display
}
//----------------------------------------------------------------------------
$(document).ready(function(){
$('#getCitizens').on('click', function() {
if(global_citizens == undefined || global_citizens.length == 0 ){
GetCitizensForTracking();
setRoutes();
}else{alert("Tracking In Progress");}
});
});
</script>
</head>
<body onload="initialize()">
<div id="map_canvas" style="width:100%; height:90%">
<!-- MAP GOES IN HERE -->
</div>
<div id="toolbar">
<button class="btn" id="getCitizens" onclick="" type="button">Get Citizens</button>
<button class="btn" id="startTracking" onclick="" type="button">Start Tracking</button>
<button class="btn" id="pauseTracking" onclick="" type="button">Pause Tracking</button>
</div>
</body>
</html>
答案 0 :(得分：1)
触发错误的行：
polyline[rNum].setMap(map);
...未置于填充polyline
if (status == google.maps.DirectionsStatus.OK){
//code
}
当条件失败时，失败的语句仍然会被执行....带有错误。
将回调的最后2个语句移动到status - 条件。
答案 1 :(得分：0)
您可以尝试将折线变量声明为字典，如下所示：
polyline = {}