I have a page as below, from Google Maps direction service. I want to remove the panel and retrieve the geolocation without user input. I will replace the line <select id="start" onchange="calcRoute();"> with <select id="start" onload="calcRoute();">. How can I pass the data for the "VAR start" and "VAR End" points? Is it possible to replace the values with my data?
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no">
<meta charset="utf-8">
<title>Directions service</title>
<style>
html, body, #map-canvas {
height: 100%;
margin: 0px;
padding: 0px
}
#panel {
position: absolute;
top: 5px;
left: 50%;
margin-left: -180px;
z-index: 5;
background-color: #fff;
padding: 5px;
border: 1px solid #999;
}
</style>
<script src="http://ift.tt/1orrD4c"></script>
<script>
var directionsDisplay;
var directionsService = new google.maps.DirectionsService();
var map;
function initialize() {
directionsDisplay = new google.maps.DirectionsRenderer();
var chicago = new google.maps.LatLng(41.850033, -87.6500523);
var mapOptions = {
zoom:7,
center: chicago
};
map = new google.maps.Map(document.getElementById('map-canvas'), mapOptions);
directionsDisplay.setMap(map);
}
function calcRoute() {
var start = document.getElementById('start').value;
var end = document.getElementById('end').value;
var request = {
origin:start,
destination:end,
travelMode: google.maps.TravelMode.DRIVING
};
directionsService.route(request, function(response, status) {
if (status == google.maps.DirectionsStatus.OK) {
directionsDisplay.setDirections(response);
}
});
}
google.maps.event.addDomListener(window, 'load', initialize);
</script>
</head>
<body>
<div id="panel">
<b>Start: </b>
<select id="start" onchange="calcRoute();">
<option value="chicago, il">Chicago</option>
<option value="st louis, mo">St Louis</option>
</select>
<b>End: </b>
<select id="end" onchange="calcRoute();">
<option value="chicago, il">Chicago</option>
<option value="st louis, mo">St Louis</option>
</select>
</div>
<div id="map-canvas"></div>
</body>
</html>
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