PHP/Javascript: Variable Swapping & Function calling
I am making a small distance finder applet. Basically, I have two variables coming from PHP from the server and they are $Location1 and $Location2. I want to integrate those variables into this Javascript. I want to substitute the variables from PHP into the ones that are found in the Javascript.
That is my main problem. My other problem is that I can't find out how to call Javascript functions into another page. For example I have this Javascript on one page called "DistanceFinder" and I want what this script to execute on another page - similar to calling a function in PHP.
Thanks for your help. I have not had any formal training and I am trying to learn these languages. If you could help me out here it would be awesome. Thanks.
P.S This is using the Google Maps API V3, and the script is from a tutorial on the internet.
<html>
<head>
<title>Distance finder</title>
<meta type="description" content="Find the distance between two places on the map and the shortest route."/>
<script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=true"></script>
<script type="text/javascript">
var location1;
var location2;
var address1;
var address2;
var latlng;
var geocoder;
var map;
var distance;
// finds the coordinates for the two locations and calls the showMap() function
function initialize()
{
geocoder = new google.maps.Geocoder(); // creating a new geocode object
// getting the two address values
address1 = document.getElementById("address1").value;
address2 = document.getElementById("address2").value;
// finding out the coordinates
if (geocoder)
{
geocoder.geocode( { 'ad开发者_运维技巧dress': address1}, function(results, status)
{
if (status == google.maps.GeocoderStatus.OK)
{
//location of first address (latitude + longitude)
location1 = results[0].geometry.location;
} else
{
alert("Geocode was not successful for the following reason: " + status);
}
});
geocoder.geocode( { 'address': address2}, function(results, status)
{
if (status == google.maps.GeocoderStatus.OK)
{
//location of second address (latitude + longitude)
location2 = results[0].geometry.location;
// calling the showMap() function to create and show the map
showMap();
} else
{
alert("Geocode was not successful for the following reason: " + status);
}
});
}
}
// creates and shows the map
function showMap()
{
// center of the map (compute the mean value between the two locations)
latlng = new google.maps.LatLng((location1.lat()+location2.lat())/2,(location1.lng()+location2.lng())/2);
// set map options
// set zoom level
// set center
// map type
var mapOptions =
{
zoom: 1,
center: latlng,
mapTypeId: google.maps.MapTypeId.HYBRID
};
// create a new map object
// set the div id where it will be shown
// set the map options
map = new google.maps.Map(document.getElementById("map_canvas"), mapOptions);
// show route between the points
directionsService = new google.maps.DirectionsService();
directionsDisplay = new google.maps.DirectionsRenderer(
{
suppressMarkers: true,
suppressInfoWindows: true
});
directionsDisplay.setMap(map);
var request = {
origin:location1,
destination:location2,
travelMode: google.maps.DirectionsTravelMode.DRIVING
};
directionsService.route(request, function(response, status)
{
if (status == google.maps.DirectionsStatus.OK)
{
directionsDisplay.setDirections(response);
distance = "The distance between the two points on the chosen route is: "+response.routes[0].legs[0].distance.text;
distance += "<br/>The aproximative driving time is: "+response.routes[0].legs[0].duration.text;
document.getElementById("distance_road").innerHTML = distance;
}
});
// show a line between the two points
var line = new google.maps.Polyline({
map: map,
path: [location1, location2],
strokeWeight: 7,
strokeOpacity: 0.8,
strokeColor: "#FFAA00"
});
// create the markers for the two locations
var marker1 = new google.maps.Marker({
map: map,
position: location1,
title: "First location"
});
var marker2 = new google.maps.Marker({
map: map,
position: location2,
title: "Second location"
});
// create the text to be shown in the infowindows
var text1 = '<div id="content">'+
'<h1 id="firstHeading">First location</h1>'+
'<div id="bodyContent">'+
'<p>Coordinates: '+location1+'</p>'+
'<p>Address: '+address1+'</p>'+
'</div>'+
'</div>';
var text2 = '<div id="content">'+
'<h1 id="firstHeading">Second location</h1>'+
'<div id="bodyContent">'+
'<p>Coordinates: '+location2+'</p>'+
'<p>Address: '+address2+'</p>'+
'</div>'+
'</div>';
// create info boxes for the two markers
var infowindow1 = new google.maps.InfoWindow({
content: text1
});
var infowindow2 = new google.maps.InfoWindow({
content: text2
});
// add action events so the info windows will be shown when the marker is clicked
google.maps.event.addListener(marker1, 'click', function() {
infowindow1.open(map,marker1);
});
google.maps.event.addListener(marker2, 'click', function() {
infowindow2.open(map,marker1);
});
// compute distance between the two points
var R = 6371;
var dLat = toRad(location2.lat()-location1.lat());
var dLon = toRad(location2.lng()-location1.lng());
var dLat1 = toRad(location1.lat());
var dLat2 = toRad(location2.lat());
var a = Math.sin(dLat/2) * Math.sin(dLat/2) +
Math.cos(dLat1) * Math.cos(dLat1) *
Math.sin(dLon/2) * Math.sin(dLon/2);
var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a));
var d = R * c;
document.getElementById("distance_direct").innerHTML = "<br/>The distance between the two points (in a straight line) is: "+d;
}
function toRad(deg)
{
return deg * Math.PI/180;
}
</script>
</head>
<body bgcolor="#eeeeee">
<div id="form" style="width:100%; height:20%">
<table align="center" valign="center">
<tr>
<td colspan="7" align="center"><b>Find the distance between two locations</b></td>
</tr>
<tr>
<td colspan="7"> </td>
</tr>
<tr>
<td>First address:</td>
<td> </td>
<td><input type="text" name="address1" id="address1" size="50"/></td>
<td> </td>
<td>Second address:</td>
<td> </td>
<td><input type="text" name="address2" id="address2" size="50"/></td>
</tr>
<tr>
<td colspan="7"> </td>
</tr>
<tr>
<td colspan="7" align="center"><input type="button" value="Show" onClick="initialize();"/></td>
</tr>
</table>
</div>
<center><div style="width:100%; height:10%" id="distance_direct"></div></center>
<center><div style="width:100%; height:10%" id="distance_road"></div></center>
<center><div id="map_canvas" style="width:70%; height:54%"></div></center>
</body>
</html>
Assuming the code you wrote is a php file...
var location1 = "<?php echo $Location1 ?>";
var location2 = "<?php echo $Location2 ?>";
That said, this will stop you from minimizing and putting this javascript into a separate JavaScript file(which you should do at some point).
My other problem is that I can't find out how to call Javascript functions into another page. For example I have this Javascript on one page called "DistanceFinder" and I want what this script to execute on another page - similar to calling a function in PHP.
Don't think of JavaScript as belonging to a certain page. Start separating your JavaScript code into separate js files so they don't clutter up your html/php files. If you want to call a function from some other JavaScript you wrote just include its .js file in the page you want to call it from.
<script type="text/javascript" src="javascripts/myCode.js"></script>
Try
var mylocationvar = "<?php echo $location1;?>";
Or even better:
var mylocationvar = <?= json_encode($location1); ?>;
加载中,请稍侯......
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