I have this simple code:
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no">
<meta charset="utf-8">
<title>Google Map API on xhtml</title>
<style>
html, body {
height: 100%;
margin: 0;
padding: 0;
}
#map {
height: 100%;
}
</style>
<head>
<body>
<script>
//Initialise la map
function initMap() {
var map = new google.maps.Map(document.getElementById('map'), {
scrollwheel: true,
mapTypeControl: false,
center: {lat: 48.8534100, lng: 2.3488000},
zoom: 13,
streetViewControl: false,
zoomControl:true
});
}
function drawOnclick() {
alert("clicked");
var antennasCircle = new google.maps.Circle({
strokeColor: "#FF0000",
strokeOpacity: 0.8,
strokeWeight: 2,
fillColor: "#FF0000",
fillOpacity: 0.35,
map: map,
center: {lat: 48.8534100, lng: 2.34},
radius: 1000* 100
});
}
</script>
<input id="clickMe" type="button" value="clickme" onclick="drawOnclick();" />
<div id="map">
</div>
<script src="https://maps.googleapis.com/maps/api/js?key=AIzaSyBbns5KFelTGVj8E8FHdlJfdM9lEHHo4OA&libraries=visualization&callback=initMap" async="async" defer="defer"></script>
</body>
</html>
My goal is to draw a red circle over Paris when I click on the button. The problem is that when I click the button, nothing happens.
What I don't understand is that when I set my initMap as follows:
//Initialise la map
function initMap() {
var map = new google.maps.Map(document.getElementById('map'), {
scrollwheel: true,
mapTypeControl: false,
center: {lat: 48.8534100, lng: 2.3488000},
zoom: 13,
streetViewControl: false,
zoomControl:true
});
var antennasCircle = new google.maps.Circle({
strokeColor: "#FF0000",
strokeOpacity: 0.8,
strokeWeight: 2,
fillColor: "#FF0000",
fillOpacity: 0.35,
map: map,
center: {lat: 48.8534100, lng: 2.34},
radius: 100
});
}
The circle is drawn. Can someone explain?
The map variable is local to the initialize function. To use it in a HTML click function (for the button), it needs to be in the global scope (where the HTML click function runs). To fix it, remove the var that declares it outside of the initialize function:
// map variable in global scope
var map;
//Initialise la map
function initMap() {
// initialize the map variable
map = new google.maps.Map(document.getElementById('map'), {
// ...
working code snippet:
html,
body {
height: 100%;
margin: 0;
padding: 0;
}
#map {
height: 100%;
}
<script>
// map variable in global scope
var map;
//Initialise la map
function initMap() {
// initialize the map variable
map = new google.maps.Map(document.getElementById('map'), {
scrollwheel: true,
mapTypeControl: false,
center: {
lat: 48.8534100,
lng: 2.3488000
},
zoom: 13,
streetViewControl: false,
zoomControl: true
});
}
function drawOnclick() {
// alert("clicked");
var antennasCircle = new google.maps.Circle({
strokeColor: "#FF0000",
strokeOpacity: 0.8,
strokeWeight: 2,
fillColor: "#FF0000",
fillOpacity: 0.35,
map: map,
center: {
lat: 48.8534100,
lng: 2.34
},
radius: 1000 * 100
});
map.fitBounds(antennasCircle.getBounds());
}
</script>
<input id="clickMe" type="button" value="clickme" onclick="drawOnclick();" />
<div id="map">
</div>
<script src="https://maps.googleapis.com/maps/api/js?key=AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qk&libraries=visualization&callback=initMap" async="async" defer="defer"></script>
Related
I am trying to remove all the 4 circle from google map with a click of a button, but currently I can only remove one circle. Could anyone let me know how I can remove the multiple circle at once with a click of a button. Sorry I am new to this. Thanks in advance.
My code:
<input onclick="removecircle();" type=button value="Remove line">
<input onclick="addcircle();" type=button value="Restore line">
<div id="map"></div>
<script>
var cityCircle;
var citymap = {
chicago: {
center: {lat: 41.878, lng: -87.629},
population: 2714856
},
newyork: {
center: {lat: 40.714, lng: -74.005},
population: 8405837
},
losangeles: {
center: {lat: 34.052, lng: -118.243},
population: 3857799
},
vancouver: {
center: {lat: 49.25, lng: -123.1},
population: 603502
}
};
function initMap() {
// Create the map.
var map = new google.maps.Map(document.getElementById('map'), {
zoom: 4,
center: {lat: 37.090, lng: -95.712},
mapTypeId: 'terrain'
});
// Construct the circle for each value in citymap.
// Note: We scale the area of the circle based on the population.
for (var city in citymap) {
// Add the circle for this city to the map.
cityCircle = new google.maps.Circle({
strokeColor: '#FF0000',
strokeOpacity: 0.8,
strokeWeight: 2,
fillColor: '#FF0000',
fillOpacity: 0.35,
map: map,
center: citymap[city].center,
radius: Math.sqrt(citymap[city].population) * 100
});
}
}
function addcircle(){
cityCircle.setMap(map);
}
function removecircle(){
cityCircle.setMap(null);
}
Image 1
Image 2
You need to keep references to the circles (and the map) in the global scope (where they will be accessible from HTML click listener functions). Then process through all the circles to either add or remove them from the map.
var circles = [];
var map;
function initMap() {
// Create the map.
map = new google.maps.Map(document.getElementById('map'), {
zoom: 3,
center: {
lat: 37.090,
lng: -95.712
},
mapTypeId: 'terrain'
});
// Construct the circle for each value in citymap.
// Note: We scale the area of the circle based on the population.
for (var city in citymap) {
// Add the circle for this city to the map.
var cityCircle = new google.maps.Circle({
strokeColor: '#FF0000',
strokeOpacity: 0.8,
strokeWeight: 2,
fillColor: '#FF0000',
fillOpacity: 0.35,
map: map,
center: citymap[city].center,
radius: Math.sqrt(citymap[city].population) * 100
});
// keep reference to the circle
circles.push(cityCircle);
}
}
function addcircle() {
for (var i = 0; i < circles.length; i++) {
circles[i].setMap(map);
}
}
function removecircle() {
for (var i = 0; i < circles.length; i++) {
circles[i].setMap(null);
}
}
proof of concept fiddle
code snippet:
html,
body,
#map {
height: 100%;
margin: 0;
padding: 0;
width: 100%;
}
<input onclick="removecircle();" type=button value="Remove circles">
<input onclick="addcircle();" type=button value="Restore circles">
<script src="https://maps.googleapis.com/maps/api/js" type="text/javascript"></script>
<div id="map"></div>
<script>
var circles = [];
var map;
function initMap() {
// Create the map.
map = new google.maps.Map(document.getElementById('map'), {
zoom: 3,
center: {
lat: 37.090,
lng: -95.712
},
mapTypeId: 'terrain'
});
// Construct the circle for each value in citymap.
// Note: We scale the area of the circle based on the population.
for (var city in citymap) {
// Add the circle for this city to the map.
var cityCircle = new google.maps.Circle({
strokeColor: '#FF0000',
strokeOpacity: 0.8,
strokeWeight: 2,
fillColor: '#FF0000',
fillOpacity: 0.35,
map: map,
center: citymap[city].center,
radius: Math.sqrt(citymap[city].population) * 100
});
circles.push(cityCircle);
}
}
function addcircle() {
for (var i = 0; i < circles.length; i++) {
circles[i].setMap(map);
}
}
function removecircle() {
for (var i = 0; i < circles.length; i++) {
circles[i].setMap(null);
}
}
google.maps.event.addDomListener(window, 'load', initMap);
var cityCircle;
var citymap = {
chicago: {
center: {
lat: 41.878,
lng: -87.629
},
population: 2714856
},
newyork: {
center: {
lat: 40.714,
lng: -74.005
},
population: 8405837
},
losangeles: {
center: {
lat: 34.052,
lng: -118.243
},
population: 3857799
},
vancouver: {
center: {
lat: 49.25,
lng: -123.1
},
population: 603502
}
};
</script>
When the user clicks on the marker the first time I want a polygon to appear. The second time they click the polygon should disappear. This code works fine for the appearing part but it does not remove the polygon from the map. Every odd click just makes the polygon darker.
body onload="initMap()">
<p id="instructions"></p>
<div id="map" style='overflow:hidden;height:500px;width:500px;'></div>
<script type="text/javascript">
function initMap() {
var myOptions = {zoom:11,center:new google.maps.LatLng(37.55020520861464,126.98140242753904),mapTypeId: google.maps.MapTypeId.ROADMAP};
map = new google.maps.Map(document.getElementById('map'), myOptions);
document.getElementById("myButton").addEventListener("click", function() {
initMarker();
myTimer();
});
}
function initMarker() {
var t1 = 1;
marker1 = new google.maps.Marker({map: map,position: new google.maps.LatLng(37.55020520861464,126.98140242753904)});
marker2 = new google.maps.Marker({map: map,position: new google.maps.LatLng(37.558816, 126.908212)});
marker3 = new google.maps.Marker({map: map,position: new google.maps.LatLng(37.580107, 127.056797)});
marker4 = new google.maps.Marker({map: map,position: new google.maps.LatLng(37.446290, 126.862625)});
marker5 = new google.maps.Marker({map: map,position: new google.maps.LatLng(37.435041, 126.999528)});
marker6 = new google.maps.Marker({map: map,position: new google.maps.LatLng(37.522926, 126.853862)});
marker1.addListener('click', function() {
var triangleCoords = [
{lat: 37.550, lng: 123.9814},
{lat: 18.466, lng: -66.118},
{lat: 32.321, lng: -64.757},
{lat: 25.774, lng: -80.190}
];
var triangle1 = new google.maps.Polygon({
paths: triangleCoords,
strokeColor: 'FF0000',
strokeOpacity: 0.8,
strokeWeight: 2,
fillColor: '#FF0000',
fillOpacity: 0.35
});
if (t1 == 1) {
triangle1.setMap(map);
t1 = 2;
}
else {
triangle1.setMap(null);
t1 = 1;
}
});
}
</script>
<div><button id="myButton">Start</button></div>
<div id="timer"></div>
<p id="explain"></p>
<script src='https://maps.googleapis.com/maps/api/js?v=3.exp'
async defer ></script>
</body>
Try moving the new polygon inside the if statement. I think, when ever you evoke that function it makes a new instance of triangle1, that's why when you try to remove polygon it deletes the new instance of "var triangle1" (which wasn't drawn to to map yet) rather than the one on the map. (sorry about the English)
marker1.addListener('click', function() {
var triangleCoords = [
{lat: 37.550, lng: 123.9814},
{lat: 18.466, lng: -66.118},
{lat: 32.321, lng: -64.757},
{lat: 25.774, lng: -80.190}
];
if (t1 == 1) {
var triangle1 = new google.maps.Polygon({
paths: triangleCoords,
strokeColor: 'FF0000',
strokeOpacity: 0.8,
strokeWeight: 2,
fillColor: '#FF0000',
fillOpacity: 0.35
});
triangle1.setMap(map);
t1 = 2;
}
else {
triangle1.setMap(null);
t1 = 1;
}
});
One option (from Removing Rectangle from Map, slightly modified...
define the triangle1 variable outside the scope of the click listener
check if the triangle1 object exists and has a .setMap method.
if it does, set it's map property to null (the polygon is currently displayed), hide it, and set it to null.
if it doesn't exist, or doesn't have a .setMap method, create the marker.
var map;
function initMap() {
var myOptions = {
zoom: 8,
center: new google.maps.LatLng(37.55020520861464, 126.98140242753904),
mapTypeId: google.maps.MapTypeId.ROADMAP
};
map = new google.maps.Map(document.getElementById('map'), myOptions);
document.getElementById("myButton").addEventListener("click", function() {
initMarker();
});
}
function initMarker() {
marker1 = new google.maps.Marker({
map: map,
title: "marker 1",
position: new google.maps.LatLng(37.55020520861464, 126.98140242753904)
});
var triangle1;
marker1.addListener('click', function(evt) {
if (triangle1 && triangle1.setMap) {
triangle1.setMap(null);
triangle1 = null;
} else {
var triangleCoords = [{
lat: 37.550,
lng: 123.9814
}, {
lat: 18.466,
lng: -66.118
}, {
lat: 32.321,
lng: -64.757
}, {
lat: 25.774,
lng: -80.190
}];
triangle1 = new google.maps.Polygon({
paths: triangleCoords,
strokeColor: 'FF0000',
strokeOpacity: 0.8,
strokeWeight: 2,
fillColor: '#FF0000',
fillOpacity: 0.35,
map: map
});
}
});
}
google.maps.event.addDomListener(window, "load", initMap);
html,
body,
#map {
height: 100%;
width: 100%;
margin: 0px;
padding: 0px
}
<script src="https://maps.googleapis.com/maps/api/js"></script>
<div>
<button id="myButton">Start</button>
</div>
<div id="timer"></div>
<p id="explain"></p>
<div id="map"></div>
I'm trying to create a map of hospitals using Google Maps API. Radius of circle is number of beds in that hospital. Also, I would like to have different colors for different types of hospitals. That could be done with IF or SWITCH statement, but neither worked. Here I am attaching example with IF statement.
Problem is with the statement if (citymap[city].tip = 1) (commented out below).
I'm sure that the problem is wrong use of function in this place.
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no">
<meta charset="utf-8">
<title>Circles</title>
<style>
html, body {
height: 100%;
margin: 0;
padding: 0;
}
#map {
height: 100%;
}
</style>
</head>
<body>
<div id="map"></div>
<script>
var citymap = {
KBC_ZAGREB: {
center: {lat: 45.823554, lng: 16.005904},
beds: 1975,
contentString: "KBC ZAGREB, 1975 kreveta",
tip: 1
},
KBC_SPLIT: {
center: {lat: 43.503908, lng: 16.457924},
beds: 1521,
contentString: "KBC SPLIT, 1521 kreveta",
tip: 1
},
KBC_RIJEKA: {
center: {lat: 45.332623, lng: 14.425665},
beds: 1191,
contentString: "KBC RIJEKA, 1192 kreveta",
tip: 1
},
KBC_OSIJEK: {
center: {lat: 45.558230, lng: 18.711740},
beds: 1160,
contentString: "KBC OSIJEK, 1160 kreveta",
tip: 1
},
KBC_SESTRE_MILOSRDNICE: {
center: {lat: 45.815438, lng: 15.953599},
beds: 1207,
contentString: "KBC SESTRE MILOSRDNICE, 1207 kreveta",
tip: 1
},
KB_DUBRAVA: {
center: {lat: 45.834369, lng: 16.035823},
beds: 625,
contentString: "KB DUBRAVA, 625 kreveta",
tip: 2
},
KB_MERKUR: {
center: {lat: 45.820832, lng: 15.997447},
beds: 345,
contentString: "KB MERKUR, 345 kreveta",
tip: 2
},
KB_SVETI_DUH: {
center: {lat: 45.820140, lng: 15.938853},
beds: 554,
contentString: "KB SVETI DUH, 554 kreveta",
tip: 2
}
};
function initMap() {
var map = new google.maps.Map(document.getElementById('map'), {
zoom: 13,
center: {lat: 45.811076, lng: 15.979270},
mapTypeId: google.maps.MapTypeId.ROADMAP
});
for (var city in citymap) {
var cityCircle = new google.maps.Circle({
strokeColor: '#FF0000',
fillColor: '#FF0000',
// if (citymap[city].tip = 1){
// strokeColor: '#FF0000',
// fillColor: '#FF0000'
// } else if (citymap[city].tip = 2){
// strokeColor: '#3333cc',
// fillColor: '#3333cc'
// },
strokeOpacity: 0.8,
strokeWeight: 2,
fillOpacity: 0.35,
map: map,
position: citymap[city].center,
center: citymap[city].center,
radius: Math.sqrt(citymap[city].beds) * 10
});
var infowindow = new google.maps.InfoWindow({
content: citymap[city].contentString
});
cityCircle.addListener('click', function() {
infowindow.open(map, cityCircle);
});
}
}
</script>
<script async defer
src="https://maps.googleapis.com/maps/api/js?signed_in=true&callback=initMap"></script>
</body>
</html>
Single equal = used to assign value, If you want to compare you could use double equals == to compare two values or triple equals === to check also the type of those compared values, in your case you can use double or triple signs :
if(citymap[city].tip == '1')
//OR
if(citymap[city].tip === '1'))
Hope this helps.
Use
if (citymap[city].tip == 1)
to check.
I have a Google.Map object with a set of polygons and polylines already being displayed on that.
I want to add a new google.maps.Polygon object that should be displayed below all elements (more or less like a "background" polygon).
I tried to add it with an absurd low zIndex value (-999999), but it still is displayed above all other elements.
This is what I have done so far:
whiteBackground = new google.maps.Polygon({
path: [ {lat:40.1, lng:-97.1},
{lat:40.1, lng:-89.8},
{lat:44.5, lng:-89.8},
{lat:44.5, lng:-97.1} ],
strokeColor: "#FF0000",
fillColor: "#FFFFFF",
strokeOpacity: 1.0,
strokeWeight: 1.5,
fillOpacity: 1.0,
zIndex: -999999
});
// add to map and to list
whiteBackground.setMap(my_map);
Is there a way to force new polygon whiteBackground to have the smallest zIndex value in the Google.Map in which it is going to be add?
Or there is an way to iterate over all current elements in a Google.Map object?
It works if you set the zIndex properties of all the polygons.
proof of concept fiddle (moves smaller polygon above/below larger polygon on click of the button)
code snippet:
// This example creates a simple polygon representing the Bermuda Triangle and a small polygon that starts above it, toggles above/below by clicking the button (large polygon has zIndex=0; small polygon is +/-1.
var map;
var infoWindow;
var poly2;
function initMap() {
map = new google.maps.Map(document.getElementById('map'), {
zoom: 5,
center: {
lat: 24.886,
lng: -70.268
},
mapTypeId: google.maps.MapTypeId.TERRAIN
});
// Define the LatLng coordinates for the polygon.
var triangleCoords = [{
lat: 25.774,
lng: -80.190
}, {
lat: 18.466,
lng: -66.118
}, {
lat: 32.321,
lng: -64.757
}];
// Construct the polygon.
var bermudaTriangle = new google.maps.Polygon({
paths: triangleCoords,
strokeColor: '#FF0000',
strokeOpacity: 0.8,
strokeWeight: 3,
fillColor: '#FF0000',
fillOpacity: 0.35,
zIndex: 0
});
bermudaTriangle.setMap(map);
var poly2Coords = [{
lat: 26.78484736105119,
lng: -72.24609375
}, {
lat: 27.059125784374068,
lng: -68.8623046875
}, {
lat: 23.926013339487024,
lng: -71.806640625
}];
poly2 = new google.maps.Polygon({
paths: poly2Coords,
strokeColor: '#0000FF',
strokeOpacity: 0.8,
strokeWeight: 3,
fillColor: '#FF0000',
fillOpacity: 0.35,
zIndex: 1
});
poly2.setMap(map);
}
google.maps.event.addDomListener(window, 'load', initMap);
html,
body {
height: 100%;
margin: 0;
padding: 0;
}
#map {
height: 100%;
}
<script src="https://maps.googleapis.com/maps/api/js"></script>
<div id="info"></div>
<input id="btn" type="button" value="click" onclick="if (poly2.get('zIndex') > 0) poly2.setOptions({zIndex:-1}); else poly2.setOptions({zIndex:1});" />
<div id="map"></div>
I'm trying to display google map with markers and circles. The map and the circle is displaying correctly but the marker are not visible on the map.
Please suggest what changes i should make in my code.
<div id="mapview" style="width: 100%; height: 700px;">
</div>
<script>
var map;
var info_window;
function initialize() {
var mapOptions = {
zoom: 11,
center: new google.maps.LatLng(51.561918, -0.31237799999996696),
mapTypeId: google.maps.MapTypeId.ROADMAP, scrollwheel: false
};
map = new google.maps.Map(document.getElementById('mapview'), mapOptions);
var image = '../Image/salemarker.png';
var user = new google.maps.Marker({
map: map,
position: new google.maps.LatLng(51.561918, -0.31237799999996696),
animation: google.maps.Animation.DROP, icon: image
});
var circle = new google.maps.Circle({
map: map,
radius: 1609.344, // 10 miles in metres
strokeColor: '#08355A;',
strokeOpacity: 0.8,
strokeWeight: 2,
fillColor: '#fffff',
fillOpacity: 0.2,
});
info_window = new google.maps.InfoWindow({
content: 'loading'
});
user.setMap(null);
function addMarkersc() {
createLocationOnMap('4 bed semi detached For sale', new google.maps.LatLng(51.5661728, 51.5661728), '<p>48, The fairway, wembley, HA..</p>');
}
addMarkersc();
circle.bindTo('center', user, 'position');
map.fitBounds(circle.getBounds());
}
google.maps.event.addDomListener(window, 'load', initialize);
var image1 = '../Image/salemarker.png';
function createLocationOnMap(titulo, posicao, conteudo) {
var m = new google.maps.Marker({
map: map,
title: titulo,
icon: image1,
position: posicao,
html: conteudo
});
google.maps.event.addListener(m, 'mouseover', function () {
info_window.setContent(this.html);
info_window.open(map, this);
});
}
</script>
Your marker is out of view. It is at 51.5661728,51.5661728:
createLocationOnMap('4 bed semi detached For sale', new google.maps.LatLng(51.5661728,51.5661728), '<p>48, The fairway, wembley, HA..</p>');}
Your map is centered at 51.561918,-0.31237799999996696
var mapOptions = {
zoom: 11,
center: new google.maps.LatLng(51.561918,-0.31237799999996696),
mapTypeId: google.maps.MapTypeId.ROADMAP,scrollwheel: false
};
working fiddle
You can try this
function InitializeMap1() {
geocoderMap = new google.maps.Geocoder();
var latlng = new google.maps.LatLng(48.856614, 2.352222);
var myOptions =
{
zoom: 12,
minZoom: 12, // panControl: false, zoomControl: false, scaleControl: false, streetViewControl: true, //
center: latlng,
streetViewControl: false,
scaleControl: true,
mapTypeId: google.maps.MapTypeId.ROADMAP,
disableDefaultUI: true,
zoomControl: true
};
map = new google.maps.Map(document.getElementById("map"), myOptions);
var arrayMain = [];
var markerLatLng = new google.maps.LatLng(48.856614, 2.352222);
var marker = new google.maps.Marker({
map: map,
position: markerLatLng,
center: markerLatLng
});
arrayMain.push(marker);
}
Try like this:
<div id="mapview" style="width: 100%; height: 700px">
<script>
var map;
var info_window;
function addMarkersc() {
var titulo = '4 bed semi detached For sale';
var posicao = new google.maps.LatLng(51.5661728,51.5661728);
var conteudo = '<p>48, The fairway, wembley, HA..</p>';
var image = '../Image/salemarker.png';
var m = new google.maps.Marker({
map: map,
title: titulo,
icon: image,
position: posicao,
html: conteudo
});
google.maps.event.addListener(m, 'mouseover', function () {
info_window.setContent(this.html);
info_window.open(map, this);
});
}
function initialize() {
var mapOptions = {
zoom: 11,
center: new google.maps.LatLng(51.561918,-0.31237799999996696),
mapTypeId: google.maps.MapTypeId.ROADMAP,scrollwheel: false
};
map = new google.maps.Map(document.getElementById('mapview'),mapOptions);
var image = '../Image/salemarker.png';
var user = new google.maps.Marker({
map: map,
position: new google.maps.LatLng(51.561918,-0.31237799999996696),
animation: google.maps.Animation.DROP,
icon: image
});
var circle = new google.maps.Circle({
map: map,
radius: 1609.344, // 10 miles in metres
strokeColor: '#08355A;',
strokeOpacity: 0.8,
strokeWeight: 2,
fillColor: '#fffff',
fillOpacity: 0.2,
});
info_window = new google.maps.InfoWindow({
content: 'loading'
});
user.setMap(null);
circle.bindTo('center', user, 'position');
map.fitBounds(circle.getBounds());
addMarkersc();
}
google.maps.event.addDomListener(window, 'load', initialize);
</script>