Question

我有这个代码：

<html>
<head>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no"/>
<script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=false">          
</script>
<script type="text/javascript">
var directionDisplay;
var map;


function initialize() {
directionsDisplay = new google.maps.DirectionsRenderer();
var copenhagen = new google.maps.LatLng(55.6771, 12.5704);
var myOptions = {
    zoom:12,
    mapTypeId: google.maps.MapTypeId.ROADMAP,
    center: copenhagen
}

map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);
directionsDisplay.setMap(map);
}


var directionsService = new google.maps.DirectionsService();

function calcRoute() {
var start = document.getElementById("start").value;
var end = document.getElementById("end").value;
var distanceInput = document.getElementById("distance");

var request = {
    origin:start,
    destination:end,
    travelMode: google.maps.DirectionsTravelMode.DRIVING
};

directionsService.route(request, function(response, status) {
    if (status == google.maps.DirectionsStatus.OK) {
        directionsDisplay.setDirections(response);
        distanceInput.value = response.routes[0].legs[0].distance.value / 1000;
    }
});
}
</script>

<title>Distance Calculator</title>

<style type="text/css">

        body {
            font-family:Helvetica, Arial;
        }
        #map_canvas {
            height: 50%;
        }
</style>
</head>
<body>

<body onload="initialize()">
<p>Enter your current location and desired destination to get the distance</p>
    <div>
        <p>
            <label for="start">Start: </label>
            <input type="text" name="start" id="start" />
<br>
            <label for="end">End:  </label>
            <input type="text" name="end" id="end" />

            <input type="submit" value="Calculate Route" onclick="calcRoute()" />
        </p>
        <p>
<script>

                 var cost=distance*2-(distance*2*0.20)

                 document.write("Cost: ");
                 document.write(cost + "<br>");


</script>
    </p>
    </div>
    <div id="map_canvas"></div>
</body>
</html>

并且问题中的代码是：

<script>

                 var cost=distance*2-(distance*2*0.20)

                 document.write("Cost: ");
                 document.write(cost + "<br>");


</script>

此代码会询问用户输入起始地址和目的地地址，并使用Google Maps API计算两点之间的距离。然后我添加了功能来计算出租车使用他们的区域固定费率公式（公里距离）* 2-20％来花费多少费用。

我的问题在于，“距离”变量是在API代码中定义的，所以当我在计算成本时引用它时，它似乎不会继续...就像它没有甚至存在。我知道它与在尝试使用它的人不同的下标中定义它有关。任何和所有建议表示赞赏！

Answer 1

我认为这就是你要找的东西。希望它有所帮助。

<html>
<head>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no"/>
<script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=false">          
</script>
<script type="text/javascript">
var directionDisplay;
var map;


function initialize() {
directionsDisplay = new google.maps.DirectionsRenderer();
var copenhagen = new google.maps.LatLng(55.6771, 12.5704);
var myOptions = {
    zoom:12,
    mapTypeId: google.maps.MapTypeId.ROADMAP,
    center: copenhagen
}

map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);
directionsDisplay.setMap(map);
}


var directionsService = new google.maps.DirectionsService();

function calcRoute() {
var start = document.getElementById("start").value;
var end = document.getElementById("end").value;
var distanceInput = document.getElementById("distance");

var request = {
    origin:start,
    destination:end,
    travelMode: google.maps.DirectionsTravelMode.DRIVING
};

directionsService.route(request, function(response, status) {
    if (status == google.maps.DirectionsStatus.OK) {
        directionsDisplay.setDirections(response);
        distanceInput.value = response.routes[0].legs[0].distance.value / 1000;

        var cost=distanceInput.value*2-(distanceInput.value*2*0.20)
        var costDiv = document.getElementById("cost");
        costDiv.style.display = "";
        costDiv.innerHTML = "Cost: "+cost + "<br>";
    }
});
}
</script>

<title>Distance Calculator</title>

<style type="text/css">

        body {
            font-family:Helvetica, Arial;
        }
        #map_canvas {
            height: 50%;
        }
</style>
</head>
<body>

<body onload="initialize()">
<p>Enter your current location and desired destination to get the distance</p>
    <div>
        <p>
            <label for="start">Start: </label>
            <input type="text" name="start" id="start" />
<br>
            <label for="end">End:  </label>
            <input type="text" name="end" id="end" />
            <input type="hidden" name="distance" id="distance" >
            <input type="submit" value="Calculate Route" onclick="calcRoute()" />
            <div style="display:none;" id="cost"></div>
        </p>
        <p>

    </p>
    </div>
    <div id="map_canvas"></div>
</body>
</html>

编辑：以下是获取最低距离和相关费用的方法。首先，您必须向Google Maps API提出requestRouteAlternatives = true的请求，否则您将只获得一条路由作为响应。其次，我确实认为谷歌正在按照它们的距离按升序返回路线 - 不完全确定，但你可以假设第一条路线是最小距离的路线。无论如何，这是一种做你想做的事情。

<html>
<head>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no"/>
<script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=false">          
</script>
<script type="text/javascript">
var directionDisplay;
var map;


function initialize() {
directionsDisplay = new google.maps.DirectionsRenderer();
var copenhagen = new google.maps.LatLng(55.6771, 12.5704);
var myOptions = {
    zoom:12,
    mapTypeId: google.maps.MapTypeId.ROADMAP,
    center: copenhagen
}

map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);
directionsDisplay.setMap(map);
}


var directionsService = new google.maps.DirectionsService();

function calcRoute() {
var start = document.getElementById("start").value;
var end = document.getElementById("end").value;
var distanceInput = document.getElementById("distance");

var request = {
    origin:start,
    destination:end,
    travelMode: google.maps.DirectionsTravelMode.DRIVING,
    provideRouteAlternatives: true
};

directionsService.route(request, function(response, status) {
    if (status == google.maps.DirectionsStatus.OK) {
        if(response.routes[0] != undefined && response.routes[0].legs[0] != undefined) {
            /* Take the min distance route */
            / * Assume the first distance is the shortest */
            var lowestDistance = response.routes[0].legs[0].distance.value;
            for(var i =0; i<response.routes.length;i=i+1) {
            console.log(response.routes[i].legs[0].distance.value);
                if(lowestDistance <= response.routes[i].legs[0].distance.value) {
                    lowestDistance = response.routes[i].legs[0].distance.value;
                    directionsDisplay.setDirections(response);
                    distanceInput.value = response.routes[i].legs[0].distance.value / 1000;

                    var cost=distanceInput.value*2-(distanceInput.value*2*0.20)
                    var costDiv = document.getElementById("cost");
                    costDiv.style.display = "";
                    costDiv.innerHTML = "Cost: "+cost + "<br>";
                }
            }
        }
    }
});
}
</script>

<title>Distance Calculator</title>

<style type="text/css">

        body {
            font-family:Helvetica, Arial;
        }
        #map_canvas {
            height: 50%;
        }
</style>
</head>
<body>

<body onload="initialize()">
<p>Enter your current location and desired destination to get the distance</p>
    <div>
        <p>
            <label for="start">Start: </label>
            <input type="text" name="start" id="start" />
<br>
            <label for="end">End:  </label>
            <input type="text" name="end" id="end" />
            <input type="hidden" name="distance" id="distance" >
            <input type="submit" value="Calculate Route" onclick="calcRoute()" />
            <div style="display:none;" id="cost"></div>
        </p>
        <p>

    </p>
    </div>
    <div id="map_canvas"></div>
</body>
</html>

如何在HTML中的下标中使用预定义变量

1 个答案: