为什么这个脚本在状态表列中没有定义
why does this script put undefined in the state table column?
Below is the HTML and the JS. The script will prompt the user to enter a starting location by address,city,state,zip, and the same for the destination. the route shows on the map and the script calculates the mileage for each state the user drives in. Then puts it into a table with one column showing the State name Abbreviated, and the second column shows the distance for that state. If the driver goes from KY to TN the mileage is calculated for the number of miles driven in each state. The problem I am having is that if the users' starting state and destination state are the same, in the state column of the table it will display undefined. the miles calculate perfectly. Is there any kind of work around that would allow the undefined to be the starting state, or previous state?
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="generator" content="CoffeeCup HTML Editor (www.coffeecup.com)">
<meta name="dcterms.created" content="Tue, 03 May 2016 17:18:33 GMT">
<meta name="description" content="">
<meta name="keywords" content="">
<title></title>
<!--[if IE]>
<script src="http://html5shim.googlecode.com/svn/trunk/html5.js"></script>
<![endif]-->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.4/jquery.min.js"></script>
<script src="https://maps.googleapis.com/maps/api/js?key=YOUR KEY &callback=initMap"></script>
<body>
<div id="map" style="height:400px"></div>
<div id="status"></div>
<div id="results"></div>
<div id="table"></div>
<div style=" text-align: left; text-indent: 0px; padding: 0px 0px 0px 0px; margin: 0px 0px 0px 0px;">
<table>
<table width="40%" border="1" cellpadding="2" cellspacing="2" style="border-color: #000000; border-style: solid; background-color: #ffffff;">
<tr valign="top">
<td style="border-color : #000000 #000000 #000000 #000000; border-style: solid;" class="state1"><br />
</td>
<td style="border-color : #000000 #000000 #000000 #000000; border-style: solid;" class="mile1"><br />
</td>
<tr valign="top">
<td style="border-color : #000000 #000000 #000000 #000000; border-style: solid;" class="state2"><br />
</td>
<td style="border-color : #000000 #000000 #000000 #000000; border-style: solid;" class="mile2"><br />
</td>
<tr valign="top">
<td style="border-color : #000000 #000000 #000000 #000000; border-style: solid;" class="state3"><br />
</td>
<td style="border-color : #000000 #000000 #000000 #000000; border-style: solid;" class="mile3"><br />
</td>
<tr valign="top">
<td style="border-color : #000000 #000000 #000000 #000000; border-style: solid;" class="state4"><br />
</td>
<td style="border-color : #000000 #000000 #000000 #000000; border-style: solid;" class="mile4"><br />
</td>
<tr valign="top">
<td style="border-color : #000000 #000000 #000000 #000000; border-style: solid;" class="state5"><br />
</td>
<td style="border-color : #000000 #000000 #000000 #000000; border-style: solid;" class="mile5"><br />
</td>
<tr valign="top">
<td style="border-color : #000000 #000000 #000000 #000000; border-style: solid;" class="state6"><br />
</td>
<td style="border-color : #000000 #000000 #000000 #000000; border-style: solid;" class="mile6"><br />
</td>
</tr>
</table>
</div>
</div>
<script>
var directionsRequest = {
origin: "New York, NY", //default
destination: "Los Angeles, LA", //default
optimizeWaypoints: true,
provideRouteAlternatives: false,
travelMode: google.maps.TravelMode.DRIVING,
drivingOptions: {
departureTime: new Date(),
trafficModel: google.maps.TrafficModel.PESSIMISTIC
}
};
directionsRequest.origin = prompt("Enter your starting address");
directionsRequest.destination = prompt("Enter your destination address");
var starttime = new Date();
var geocoder = new google.maps.Geocoder();
var startState;
var currentState;
var routeData;
var index = 0;
var stateChangeSteps = [];
var borderLatLngs = {};
var startLatLng;
var endLatLng;
directionsService = new google.maps.DirectionsService();
directionsService.route(directionsRequest, init);
function init(data){
routeData = data;
displayRoute();
startLatLng = data.routes[0].legs[0].start_location;
endLatLng = data.routes[0].legs[0].end_location;
geocoder.geocode({location:data.routes[0].legs[0].start_location}, assignInitialState)
}
function assignInitialState(data){
startState = getState(data);
currentState = startState;
compileStates(routeData);
}
function getState(data){
for (var i = 0; i < data.length; i++) {
if (data[i].types[0] === "administrative_area_level_1") {
var state = data[i].address_components[0].short_name;
}
}
return state;
}
function compileStates(data, this_index){
if(typeof(this_index) == "undefined"){
index = 1;
geocoder.geocode({location:data.routes[0].legs[0].steps[0].start_location}, compileStatesReceiver);
}else
{
if(index >= data.routes[0].legs[0].steps.length){
console.log(stateChangeSteps);
index = 0;
startBinarySearch();
return;
}
setTimeout(function(){
geocoder.geocode({location:data.routes[0].legs[0].steps[index].start_location}, compileStatesReceiver);
$("#status").html("Indexing Step "+index+"... "+data.routes[0].legs[0].steps.length+" Steps Total");
}, 3000)
}
}
function compileStatesReceiver(response){
state = getState(response);
console.log(state);
if(state != currentState){
currentState = state;
stateChangeSteps.push(index-1);
}
index++;
compileStates(routeData, index);
}
var stepIndex = 0;
var stepStates = [];
var binaryCurrentState = "";
var stepNextState;
var stepEndState;
var step;
var myLatLng = {lat:39.8282, lng:-98.5795};
var map = new google.maps.Map(document.getElementById('map'), {
zoom: 4,
center: myLatLng
});
function displayRoute() {
directionsDisplay = new google.maps.DirectionsRenderer();
directionsDisplay.setMap(map);
directionsDisplay.setDirections(routeData);
}
var orderedLatLngs = [];
function startBinarySearch(iterating){
if(stepIndex >= stateChangeSteps.length){
for(step in borderLatLngs){
for(state in borderLatLngs[step]){
for(statename in borderLatLngs[step][state]){
(JSON.stringify(borderLatLngs[step][state][statename],null, 4));
orderedLatLngs.push([borderLatLngs[step][state][statename], statename]);
}
}
}
compileMiles(true);
return;
//$("#results").append("<br>Cross into "+statename+" at "+
}
step = routeData.routes[0].legs[0].steps[stateChangeSteps[stepIndex]];
console.log("Looking at step "+stateChangeSteps[stepIndex]);
borderLatLngs[stepIndex] = {};
if(!iterating){
binaryCurrentState = startState;
}
geocoder.geocode({location:step.end_location},
function(data){
if(data === null){
setTimeout(function(){startBinarySearch(true);}, 6000);
}else{
stepNextState = getState(data);
stepEndState = stepNextState;
binaryStage2(true);
}
});
}
var minIndex;
var maxIndex;
var currentIndex;
function binaryStage2(init){
if (typeof(init) != "undefined"){
minIndex = 0;
maxIndex = step.path.length - 1;
}
if((maxIndex-minIndex)<2){
borderLatLngs[stepIndex][maxIndex]={};
borderLatLngs[stepIndex][maxIndex][stepNextState]=step.path[maxIndex];
var marker = new google.maps.Marker({
position: borderLatLngs[stepIndex][maxIndex][stepNextState],
map: map,
});
if(stepNextState != stepEndState){
minIndex = maxIndex;
maxIndex = step.path.length - 1;
binaryCurrentState = stepNextState;
stepNextState = stepEndState;
}else{
stepIndex++;
binaryCurrentState = stepNextState;
startBinarySearch(true);
return;
}
}
console.log("Index starts: "+minIndex+" "+maxIndex);
console.log("current state is "+binaryCurrentState);
console.log("next state is "+ stepNextState);
console.log("end state is "+ stepEndState);
currentIndex = Math.floor((minIndex+maxIndex)/2);
setTimeout(function(){
geocoder.geocode({location:step.path[currentIndex]}, binaryStage2Reciever);
$("#status").html("Searching for division between "+binaryCurrentState+" and "+stepNextState+" between indexes "+minIndex+" and "+maxIndex+"...")
}, 3000);
}
function binaryStage2Reciever(response){
if(response === null){
setTimeout(binaryStage2, 6000);
}else{
state = getState(response)
if(state == binaryCurrentState){
minIndex = currentIndex +1;
}else{
maxIndex = currentIndex - 1
if(state != stepNextState){
stepNextState = state;
}
}
binaryStage2();
}
}
var currentStartPoint;
var compileMilesIndex = 0;
var stateMiles = {};
var trueState;
function compileMiles(init){
if(typeof(init)!= "undefined"){
currentStartPoint = startLatLng;
trueState = startState;
}
if(compileMilesIndex == orderedLatLngs.length){
directionsRequest.destination = endLatLng;
}else{
directionsRequest.destination = orderedLatLngs[compileMilesIndex][0];
}
directionsRequest.origin = currentStartPoint;
currentStartPoint = directionsRequest.destination;
directionsService.route(directionsRequest, compileMilesReciever)
}
function compileMilesReciever(data){
if(data===null){
setTimeout(compileMiles, 6000);
}else{
if(compileMilesIndex == orderedLatLngs.length){
stateMiles[stepEndState]=data.routes[0].legs[0].distance["text"];
var txt = "";
var i = 0;
for(state in stateMiles)
{
i++;
$("#results").append
$(".state"+i).append(state);
$(".mile"+i).append(stateMiles[state]);
}
var endtime = new Date();
totaltime = endtime - starttime;
//$("#results").append("<br><br>Operation took "+Math.floor(totaltime/60000)+" minute(s) and "+(totaltime%60000)/1000+" second(s) to run.");
return;
}else{
stateMiles[trueState]=data.routes[0].legs[0].distance["text"];
}
trueState = orderedLatLngs[compileMilesIndex][1];
compileMilesIndex++;
setTimeout(compileMiles, 3000);
}
}
</script>
<script>
</script>
</script>
</head>
</script>
</body>
</html>
该脚本将提示用户按地址、城市、州、邮政编码输入起始位置，并且目的地也是如此。 路线显示在地图上，脚本计算用户驾驶的每个州的里程数。然后将其放入一个表中，其中一列显示缩写的州名，第二列显示该州的距离。如果司机从肯塔基州到田纳西州，则根据每个州的行驶里程数计算里程数。我遇到的问题是，如果用户的起始状态和目标状态相同，则在表的状态列中将显示未定义。里程计算完美。是否有任何解决方法可以将未定义作为起始状态或先前状态？
您正在使用重复的 ID。你永远不应该这样做。
您正在将内容附加到看起来不存在的 .state 和 .mile 元素。
编辑：它使用 css 选择器。
如果你这样做$(".foo").append("bar");那么你将"bar"附加到带有class foo的元素。如果你这样做$("#foo").append("bar");那么你将"bar"附加到带有id foo的元素中。
在您的情况下，内容将附加到.state0、.state1等(在for循环中使用变量i(。所以你可能需要使用<td class="state0"> <td class="state1">
在这种情况下，您可以使用<td id="state0"> <td id="state1">因为它们是唯一的 id，但您需要调整脚本。
如果您问题中的代码来自相关问题：谷歌地图 api v3 按州计算里程(看起来像，但我没有做完整的比较(。
它在对该问题的回答中特别指出(强调我的(：
另一个注意事项：有几个州边界穿过水体。Google 认为这些不位于任何州，因此报告未定义为州名称。
如果路径未转换状态，请使用方向服务返回的完整路径的距离。
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