Distance between two locations

Question

<html>
<head>
<script src="http://maps.googleapis.com/maps/api/js"></script>
<script type="text/javascript">
function showMap()
{
    var directionsDisplay = new google.maps.DirectionsRenderer();
    var directionsService = new google.maps.DirectionsService();
    var map;

    var mapProp = 
    {
        mapTypeId : google.maps.MapTypeId.ROADMAP
    };

    map = new google.maps.Map(document.getElementById("googleMap"), mapProp);
    directionsDisplay.setMap(map);
    directionsDisplay.setPanel(document.getElementById('textDirection'));

    var start = document.getElementById('origin').value;
    var end = document.getElementById('destination').value;
    var directionsRequest = 
    {
        origin : start,
        destination : end,
        travelMode : google.maps.TravelMode.DRIVING
    }

    directionsService.route(directionsRequest, function(response, status)
    {
        if(status === google.maps.DirectionsStatus.OK)
        {
            directionsDisplay.setDirections(response);          
        }
        else
        {
            window.alert('Cannot'); 
        }
    });
}

function resetMap()
{
    document.getElementById("origin").value = '';
    document.getElementById("destination").value = '';
    document.getElementById("googleMap").style.display = 'none';
    document.getElementById("textDirection").style.display = 'none';
}  
</script>
<style>
#textDirection{
width: 300px;
height: 62%;
float: right;
overflow-y: auto;
margin-top: 1%;
margin-right: 29%;
}

#googleMap{
width : 50%;
height : 60%;
position : absolute;
top: 60px;
margin-left: 5px;
}
</style>
</head>

<body>
<form action="showmap1.php" method="post">
From: <input type="text" name="origin" id="origin" size="30" />&nbsp;
To:<input type="text" name="destination" id="destination" size="30" />
<input type="button" value="Search" onclick="showMap()" />
<input type="button" value="Reset" onclick="resetMap()" />
<div id="googleMap"></div>
<div id="textDirection"></div>
</form>
</body>
</html>

From above code, I have following question:
(1) When I clicked Reset button, I search another place and click Search button. However, the google map and text direction doesn't show like the below image.

How should I modify it?

(2) When I search the location 2nd time, the text direction route are duplicated show like below image.
How should I make it only show once?

score 2 · Accepted Answer · answered Oct 13 '15 at 03:58

First Question:

Because you had called

document.getElementById("googleMap").style.display = 'none';
document.getElementById("textDirection").style.display = 'none';

so it will not displayed in the next time. you need to set element display in showMap(). Ex:

function showMap()
{
    document.getElementById("googleMap").style.display = 'inline';
    document.getElementById("textDirection").style.display = 'inline';
    ......
}

Second Question:

You need to call

directionsDisplay.setMap(map);
directionsDisplay.setPanel(document.getElementById('textDirection'));

in a function initializeMap(), should not called in showMap() function. You could call initializeMap() on body onload(). Full answer is here:

<html>
<head>
<script src="http://maps.googleapis.com/maps/api/js"></script>
<script type="text/javascript">
  
  var directionsDisplay;
  var directionsService;
  var map;
  
function initialize() 
{    
     directionsDisplay= new google.maps.DirectionsRenderer();
     directionsService = new google.maps.DirectionsService();
  
     var mapProp = 
     {
        zoom: 7,
        center: {lat: 41.85, lng: -87.65},
        mapTypeId : google.maps.MapTypeId.ROADMAP
     };

     map = new google.maps.Map(document.getElementById("googleMap"), mapProp);
     directionsDisplay.setMap(map);
     directionsDisplay.setPanel(document.getElementById('textDirection'));
}
function showMap()
{
    document.getElementById("googleMap").style.display = 'inline';
    document.getElementById("textDirection").style.display = 'inline';
    var start = document.getElementById('origin').value;
    var end = document.getElementById('destination').value;
    var directionsRequest = 
    {
        origin : start,
        destination : end,
        travelMode : google.maps.TravelMode.DRIVING
    }

    directionsService.route(directionsRequest, function(response, status)
    {
        if(status === google.maps.DirectionsStatus.OK)
        {
            directionsDisplay.setDirections(response);          
        }
        else
        {
            window.alert('Cannot'); 
        }
    });
}

function resetMap()
{
    document.getElementById("origin").value = '';
    document.getElementById("destination").value = '';
    document.getElementById("googleMap").style.display = 'none';
    document.getElementById("textDirection").style.display = 'none';
}  
</script>

<style>
#textDirection{
width: 300px;
height: 62%;
float: right;
overflow-y: auto;
margin-top: 1%;
margin-right: 29%;
}

#googleMap{
width : 50%;
height : 60%;
position : absolute;
top: 60px;
margin-left: 5px;
}
</style>
</head>

<body onload="initialize()">
<form action="showmap1.php" method="post">
From: <input type="text" name="origin" id="origin" size="30" />&nbsp;
To:<input type="text" name="destination" id="destination" size="30" />
<input type="button" value="Search" onclick="showMap()" />
<input type="button" value="Reset" onclick="resetMap()" />
<div id="googleMap"></div>
<div id="textDirection"></div>
</form>
</body>
</html>

score 1 · Answer 2 · answered Oct 13 '15 at 03:10

If I understand your question, you are performing multiple searches and would like the DirectionsRenderer to have a clean slate on each search. You should be able to removing the map and creating a new instance to attach to the div

if(status === google.maps.DirectionsStatus.OK)
{
    // clear the directionsDisplay
    directionsDisplay.setMap(null);
    directionsDisplay = new google.maps.DirectionsRenderer();
    directionsDisplay.setPanel(document.getElementById('textDirection'));

    directionsDisplay.setDirections(response);          
}
else
{
    window.alert('Cannot'); 
}

Distance between two locations

2 Answers2

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