This module contains two utilities. 1. Finding your current location 2. Searching a particular location. Markers are also added with hard-coded array elements containing name of cities and it's coordinates. Filters are also applied to convert decimal coordinated to degree minutes and seconds. I hope you find this angularjs tutorial helpful.
<!-- HTML module -->
<!DOCTYPE html>
<html>
<body ng-app="app" ng-controller="appCtrl">
<script
src="http://ajax.googleapis.com/ajax/libs/angularjs/1.0.3/angular.min.js"></script>
<script
src="http://maps.googleapis.com/maps/api/js?sensor=false&language=en"></script>
<script type="text/javascript" src="geoLoc.js"></script>
<h3>Google Maps</h3>
<!-- search/go to current location -->
<div class="text-right">
<div class="input-append text-right">
<input type="text" ng-model="search"/>
<button class="btn" type="button" ng-click="geoCode()" ng-disabled="search.length == 0" title="search" >
<i class="icon-search"></i>Where is this place?
</button>
<button class="btn" type="button" ng-click="gotoCurrentLocation()" title="current location">
<i class="icon-home"></i>Where am I now?
</button>
</div>
</div>
<!-- map -->
<app-map style="height:400px;margin:12px;box-shadow:0 3px 25px black;"
center="loc"
markers="cities" >
</app-map>
<!-- current location -->
<div class="text-info text-right">
{{loc.lat | lat:0}}, {{loc.lon | lon:0}}
</div>
<!-- list of cities -->
<div class="container-fluid">
<div class="span3 btn"
ng-repeat="a in cities"
ng-click="gotoLocation(a.lat, a.lon)">
<b>{{a.place}}</b>: {{a.desc}}
</div>
</div>
</body>
</html
/* JS module */
var app = angular.module("app", []);
app.controller("appCtrl", function ($scope) {
// current location
$scope.loc = { lat: 23, lon: 79 };
$scope.gotoCurrentLocation = function () {
if ("geolocation" in navigator) {
navigator.geolocation.getCurrentPosition(function (position) {
var c = position.coords;
$scope.gotoLocation(c.latitude, c.longitude);
});
return true;
}
return false;
};
$scope.gotoLocation = function (lat, lon) {
if ($scope.lat != lat || $scope.lon != lon) {
$scope.loc = { lat: lat, lon: lon };
if (!$scope.$$phase) $scope.$apply("loc");
}
};
// geo-coding
$scope.search = "";
$scope.geoCode = function () {
if ($scope.search && $scope.search.length > 0) {
if (!this.geocoder) this.geocoder = new google.maps.Geocoder();
this.geocoder.geocode({ 'address': $scope.search }, function (results, status) {
if (status == google.maps.GeocoderStatus.OK) { var loc = results[0].geometry.location;
$scope.search = results[0].formatted_address;
$scope.gotoLocation(loc.lat(), loc.lng());
} else {
alert("Sorry, this search produced no results.");
}
});
}
};
$scope.cities = [
{
place : 'India',
desc : 'A country of culture and tradition!',
lat : 23.200000,
lon : 79.225487
},
{
place : 'New Delhi',
desc : 'Capital of India...',
lat : 28.500000,
lon : 77.250000
},
{
place : 'Kolkata',
desc : 'City of Joy...',
lat : 22.500000,
lon : 88.400000
},
{
place : 'Mumbai',
desc : 'Commercial city!',
lat : 19.000000,
lon : 72.90000
},
{
place : 'Bangalore',
desc : 'Silicon Valley of India...',
lat : 12.9667,
lon : 77.5667
}
];
});
// formats a number as a latitude (e.g. 20.46... => "20°27'44"N")
app.filter('lat', function () {
return function (input, decimals) {
if (!decimals) decimals = 0;
input = input * 1;
var ns = input > 0 ? "N" : "S";
input = Math.abs(input);
var deg = Math.floor(input);
var min = Math.floor((input - deg) * 60);
var sec = ((input - deg - min / 60) * 3600).toFixed(decimals);
return deg + "°" + min + "'" + sec + '"' + ns;
}
});
// formats a number as a longitude (e.g. -80.02... => "80°1'24"W")
app.filter('lon', function () {
return function (input, decimals) {
if (!decimals) decimals = 0;
input = input * 1;
var ew = input > 0 ? "E" : "W";
input = Math.abs(input);
var deg = Math.floor(input);
var min = Math.floor((input - deg) * 60);
var sec = ((input - deg - min / 60) * 3600).toFixed(decimals);
return deg + "°" + min + "'" + sec + '"' + ew;
}
});
// - Documentation: https://developers.google.com/maps/documentation/
app.directive("appMap", function () {
return {
restrict: "E",
replace: true,
template: "<div></div>",
scope: {
center: "=", // Center point on the map (e.g. <code>{ latitude: 10, longitude: 10 }</code>).
markers: "=", // Array of map markers (e.g. <code>[{ lat: 10, lon: 10, name: "hello" }]</code>).
width: "@", // Map width in pixels.
height: "@", // Map height in pixels.
zoom: "@", // Zoom level (one is totally zoomed out, 25 is very much zoomed in).
mapTypeId: "@", // Type of tile to show on the map (roadmap, satellite, hybrid, terrain).
panControl: "@", // Whether to show a pan control on the map.
zoomControl: "@", // Whether to show a zoom control on the map.
scaleControl: "@" // Whether to show scale control on the map.
},
link: function (scope, element, attrs) {
var toResize, toCenter;
var map;
var currentMarkers;
// listen to changes in scope variables and update the control
var arr = ["width", "height", "markers", "mapTypeId", "panControl", "zoomControl", "scaleControl"];
for (var i = 0, cnt = arr.length; i < arr.length; i++) {
scope.$watch(arr[i], function () {
cnt--;
if (cnt <= 0) {
updateControl();
}
});
}
// update zoom and center without re-creating the map
scope.$watch("zoom", function () {
if (map && scope.zoom)
map.setZoom(scope.zoom * 1);
});
scope.$watch("center", function () {
if (map && scope.center)
map.setCenter(getLocation(scope.center));
});
// update the control
function updateControl() {
// update size
if (scope.width) element.width(scope.width);
if (scope.height) element.height(scope.height);
// get map options
var options =
{
center: new google.maps.LatLng(23, 79),
zoom: 6,
mapTypeId: "roadmap"
};
if (scope.center) options.center = getLocation(scope.center);
if (scope.zoom) options.zoom = scope.zoom * 1;
if (scope.mapTypeId) options.mapTypeId = scope.mapTypeId;
if (scope.panControl) options.panControl = scope.panControl;
if (scope.zoomControl) options.zoomControl = scope.zoomControl;
if (scope.scaleControl) options.scaleControl = scope.scaleControl;
// create the map
map = new google.maps.Map(element[0], options);
// update markers
updateMarkers();
// listen to changes in the center property and update the scope
google.mapTypeIds.event.addListener(map, 'center_changed', function () {
// do not update while the user pans or zooms
if (toCenter) clearTimeout(toCenter);
toCenter = setTimeout(function () {
if (scope.center) {
// check if the center has really changed
if (map.center.lat() != scope.center.lat ||
map.center.lng() != scope.center.lon) {
// update the scope and apply the change
scope.center = { lat: map.center.lat(), lon: map.center.lng() };
if (!scope.$$phase) scope.$apply("center");
}
}
}, 500);
});
}
// update map markers to match scope marker collection
function updateMarkers() {
if (map && scope.markers) {
// clear old markers
if (currentMarkers != null) {
for (var i = 0; i < currentMarkers.length; i++) {
currentMarkers[i] = m.setMap(null);
}
}
// create new markers
currentMarkers = [];
var markers = scope.markers;
if (angular.isString(markers)) markers = scope.$eval(scope.markers);
for (var i = 0; i < markers.length; i++) {
var m = markers[i];
var loc = new google.maps.LatLng(m.lat, m.lon);
var mm = new google.maps.Marker({ position: loc, map: map, title: m.name });
currentMarkers.push(mm);
}
}
}
// convert current location to Google maps location
function getLocation(loc) {
if (loc == null) return new google.maps.LatLng(23, 79);
if (angular.isString(loc)) loc = scope.$eval(loc);
return new google.maps.LatLng(loc.lat, loc.lon);
}
}
};
});
You can also find the code in : Google Drive
And can also check out for the video tutorial on : Youtube - Using Google Map Geolocation API with AngularJS
Google Maps
{{loc.lat | lat:0}}, {{loc.lon | lon:0}}
{{a.place}}: {{a.desc}}
No comments:
Post a Comment