Google Map for Android - javascript

I am new to mobile programming and trying out the google map v3 tutorial,
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
<script type="text/javascript">
function initialize() {
alert('init');
var latlng = new google.maps.LatLng(-34.397, 150.644);
var myOptions = {
zoom: 8,
center: latlng,
mapTypeId: google.maps.MapTypeId.ROADMAP
};
var map = new google.maps.Map(document.getElementById("map_canvas"),
myOptions);
}
var myKey = "mykey";
function loadScript() {
var script = document.createElement('script');
script.type = 'text/javascript';
script.src = "https://maps.googleapis.com/maps/api/js?key="+myKey+"&sensor=false&callback=initialize";
document.body.appendChild(script);
}
</script>
</head>
<body onload="loadScript()">
<div id="map_canvas" style="width: 400px; height: 400px">
</div>
</body>
</html>
I tried this using my computer in netbean, everything works, but when i download it into my android device (as an application), the callback function ( initialize ) is never called. Anyone know what is the problem to this?
Thanks

First off all download phone gap plugin
<!DOCTYPE html>
<html>
<head>
<title>Simple Map</title>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no">
<meta charset="utf-8">
<style>
html, body, #map-canvas {
height: 100%;
margin: 0px;
padding: 0px
}
</style>
<script src="https://maps.googleapis.com/maps/api/js?v=3.exp&sensor=false"></script>
<script>
var map;
function initialize() {
var mapOptions = {
zoom: 8,
center: new google.maps.LatLng(-34.397, 150.644),
mapTypeId: google.maps.MapTypeId.ROADMAP
};
map = new google.maps.Map(document.getElementById('map-canvas'),
mapOptions);
}
google.maps.event.addDomListener(window, 'load', initialize);
</script>
</head>
<body>
<div id="map-canvas"></div>
</body>
</html>
try to run the above code in the mobile/emulator ,then you can have sample map displayed

Related

Why is my Google Maps Marker not displaying? [closed]

Closed. This question needs debugging details. It is not currently accepting answers.
Edit the question to include desired behavior, a specific problem or error, and the shortest code necessary to reproduce the problem. This will help others answer the question.
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Improve this question
Why can't I add a marker to Google Maps on my page? I am working with Google Maps API. I don't know what the problem is. Here is my code:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
<script type="text/javascript" src="https://maps.googleapis.com/maps/api/js?key=API&callback=initMap" ></script>
</head>
<body>
<div class="location"style="height: 300px; width: 600px;"></div>
<script>
let loc = document.querySelector(".location");
window.onload=loadMap
function loadMap(){
const myLatLng = { lat: 50.488057309872424, lng: 30.47287431851951 };
let options={
center:myLatLng,
zoom: 15,
mapTypeId: google.maps.MapTypeId.ROADMAP
}
let map=new google.maps.Map(loc,options)
let marker= new google.maps.Marker({
positon: myLatLng,
map:map,
title: "Это ВЫ!"
});
}
</script>
</body>
</html>
I read Google documentation but I can't find my mistake.
A corrected example that will display the marker once the correct apikey is used. The issue was the incorrect spelling of position... also removed the window.onload=loadMap as that was redundant if using the callback parameter in the script url. Adding async and defer to the script url should help ensure that the dom is loaded before attempting to run the javascript code
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
<style>
.location {
width: 600px;
height: 300px;
}
</style>
</head>
<body>
<div class="location"></div>
<script>
function loadMap() {
const myLatLng = {
lat: 50.488057309872424,
lng: 30.47287431851951
};
let options = {
center: myLatLng,
zoom: 15,
mapTypeId: google.maps.MapTypeId.ROADMAP
}
let map = new google.maps.Map(document.querySelector(".location"), options);
let marker = new google.maps.Marker({
position: myLatLng,
map: map,
title: ""
})
}
</script>
<script async defer src='//maps.googleapis.com/maps/api/js?key=AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qk&callback=loadMap'></script>
</body>
</html>

How to add an array of markers using Lat/Lng - google maps api

Would someone be able to explain what I need to do to add an array of markers using javascript. I understand that basics of displaying the map and adding a marker or even multiple markers but they have to be hard coded in. I want to display a list of markers from an API.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<h3>test</h3>
<div id="map"></div>
<style>
#map {
height: 800px;
width: 100%;
}
</style>
<script>
// Initialize and add the map
function initMap() {
// The location of L.A
var L.A = {
lat: 34.0503743841965,lng: -118.24525401223457
};
// The map, centered at L.A
var map = new google.maps.Map(document.getElementById("map"), {
zoom: 8,
center: L.A,
mapId: "hidden"
});
//here is where i am having trouble
//how can i turn this into an array of lat/lng that add a marker for each lat/lng?
var markerView = new google.maps.marker.AdvancedMarkerView({
map: map,
position: {
lat: 37.4239163,
lng: -122.0947209
},
});
}
window.initMap = initMap;
</script>
<script src="https://maps.googleapis.com/maps/api/js?key=hiddenE&v=beta&libraries=marker&callback=initMap">
</script>
</body>
</html>

How can I mark multiple location in google map from mysql table?

How can I mark multiple locations in google map. Latitude and Longitute are getting from my table as json response. Please check below code and json response and correct me?
When I alert(myCenter) latitude and longitude are showing correctly but not showing correctly on map
Json encode
[{"id":"1","lat":"9.9710364","lng":"76.2382596","address":"Ernakulam, pra"},{"id":"2","lat":"9.5946677"
,"lng":"76.5030831","address":"Kochi pra"},{"id":"3","lat":"8.8862925","lng":"76.5850831","address":"Kollam
pra"},{"id":"4","lat":"8.4998965","lng":"76.8543216","address":"Trivandrum pra"}]
Code
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- The above 3 meta tags *must* come first in the head; any other head content must come *after* these tags -->
<title>Bootstrap 101 Template</title>
<!-- Latest compiled and minified CSS -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" integrity="sha384-1q8mTJOASx8j1Au+a5WDVnPi2lkFfwwEAa8hDDdjZlpLegxhjVME1fgjWPGmkzs7" crossorigin="anonymous">
<!-- Optional theme -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap-theme.min.css" integrity="sha384-fLW2N01lMqjakBkx3l/M9EahuwpSfeNvV63J5ezn3uZzapT0u7EYsXMjQV+0En5r" crossorigin="anonymous">
</head>
<body>
<h1>Load Multiple Marker</h1>
<div id="googleMap" style="width: 800px; height: 500px;">
<!-- jQuery (necessary for Bootstrap's JavaScript plugins) -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
<!-- Map -->
<script src="http://maps.googleapis.com/maps/api/js"></script>
<script>
$(function(){
$.ajax({
url: 'geo-locations.php',
success:function(data){
//Loop through each location.
$.each(data, function(){
//Plot the location as a marker
var myCenter = new google.maps.LatLng(this.lat, this.lng);
//alert(myCenter)
function initialize()
{
var mapProp = {
center: myCenter,
zoom:5,
mapTypeId: google.maps.MapTypeId.ROADMAP
};
var map = new google.maps.Map(document.getElementById("googleMap"),mapProp);
var marker = new google.maps.Marker({
position: myCenter,
title:'Click to zoom'
});
marker.setMap(map);
// Zoom to 9 when clicking on marker
google.maps.event.addListener(marker,'click',function() {
map.setZoom(9);
map.setCenter(marker.getPosition());
});
}
google.maps.event.addDomListener(window, 'load', initialize);
});
}
});
});
</script>
<!-- Latest compiled and minified JavaScript -->
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js" integrity="sha384-0mSbJDEHialfmuBBQP6A4Qrprq5OVfW37PRR3j5ELqxss1yVqOtnepnHVP9aJ7xS" crossorigin="anonymous"></script>
</body>
</html>
There is no need to initialize map instance per every marker, you could change the flow to:
initialize a map
once the data is loaded, place markers on the map
Example
$(function () {
$.ajax({
url: 'https://rawgit.com/vgrem/e2dda2a255a24df92bff/raw/d9c694b635612ee405c7d16c355dca19adb6380c/geo-locations.json',
success: function (data) {
initialize(data);
}
});
});
function addMarker(map,position){
var marker = new google.maps.Marker({
position: position,
title: 'Click to zoom'
});
marker.setMap(map);
// Zoom to 9 when clicking on marker
google.maps.event.addListener(marker, 'click', function () {
map.setZoom(9);
map.setCenter(marker.getPosition());
});
}
function initialize(data) {
var mapProp = {
zoom: 5,
mapTypeId: google.maps.MapTypeId.ROADMAP
};
var map = new google.maps.Map(document.getElementById("googleMap"), mapProp);
var bounds = new google.maps.LatLngBounds();
$.each(data,function(pos) {
var pos = new google.maps.LatLng(this.lat, this.lng);
bounds.extend(pos);
addMarker(map,pos);
});
map.fitBounds(bounds);
}
<h1>Load Multiple Marker</h1>
<div id="googleMap" style="width: 800px; height: 500px;">
<!-- jQuery (necessary for Bootstrap's JavaScript plugins) -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
<script src="http://maps.googleapis.com/maps/api/js"></script>
PhpFiddle

Getting App Inventor 2 variable values in an HTML/Javascript file

I am setting up a simple map program for a user to see locations on an embedded Google map. I have the map working, but I was wondering if there is a way for the user to input coordinates in AI2 then have the map center there.
Here is the HTML file I am using to display the map.
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
<style type="text/css">
html { height: 100% }
body { height: 100%; margin: 0; padding: 0 }
#map_canvas { height: 100% }
</style>
<script type="text/javascript" src="https://maps.googleapis.com/maps/api/js?&sensor=true&language=en"></script>
<script type="text/javascript">
function initialize() {
var mapOptions = {
center: new google.maps.LatLng(-34.397, 150.644),
zoom: 8,
mapTypeId: google.maps.MapTypeId.ROADMAP
};
map = new google.maps.Map(document.getElementById("map_canvas"), mapOptions);
// Add a listener for the click event
google.maps.event.addListener(map, 'click', showPosition);
}
function showPosition(event) {
// display a marker on the map
marker = new google.maps.Marker({
position: event.latLng,
map: map,
icon: "./marker.png"
});
// print the selected position to the page title
var position = event.latLng.lat().toFixed(6) + ", " + event.latLng.lng().toFixed(6);
window.document.title = position;
}
</script>
</head>
<body onload="initialize()">
<div id="map_canvas" style="width:100%; height:100%"></div>
</body>
</html>
Yes, that's possible.
You can use WebViewString to communicate values back and forth between your App and the WebViewer. In your App, you get and set the WebViewer.WebViewString properties. In your webviewer, you open to a page that has Javascript that references the window.AppInventor object, using its getWebViewString() and setWebViewString(text) methods.
See also the following snippet for a complete example.
<!doctype html>
<head>
<meta name="author" content="puravidaapps.com">
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Test</title>
</head>
<body>
<script>
document.write("The value from the app is<br />" + window.AppInventor.getWebViewString());
window.AppInventor.setWebViewString("hello from Javascript")
</script>
</body>
</html>

Google Maps Javascript - unable to load

I am a beginner to javascript and am trying to load a simple Google Map in my browser (firefox). However, the map does not load.
Below is my html:
<!doctype html>
<html>
<head>
<title>Can you guess the Country?</title>
<meta charset="utf-8">
<script type="text/javascript" src="http://maps.google.com/maps/api/js?key={MY_API_KEY}&sensor=true"></script>
<script src="mapGame.js"></script>
</head>
<body>
<div id="map">
</div>
</body>
</html>
Below is the linked mapGame.js:
var map;
function initialize() {
var mapOptions = {
zoom: 8,
center: new google.maps.LatLng(-34.397, 150.644),
mapTypeId: google.maps.MapTypeId.ROADMAP
};
map = new google.maps.Map(document.getElementById('map'), mapOptions);
}
google.maps.event.addDomListener(window, 'load', initialize);
Any help is much appreciated!
probably has to do with the height of the div#map, the map is there but you just don't see it.
<head>
<style>
#map {
height:500px;
}
</style>
</head>

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