javascriptphpgoogle-mapsflickr
How to link Google Map API markers to Flickr API photo search based on location
I am working on a Google map application that will display locations that are loaded from a mySQL database and LatLng coordinates. I then create markers based on distance from a given center. I have info windows that display information about each point. But I want to be able to load images onto these info windows using Flickr’s API.
I constructed a php file, called photos.php that gets all the photos from a position, which I hardcoded, then displays them. However, I want these images to be displayed on the info windows and I cannot figure how to pass the correct latlng of each marker to the Flickr request.
I have been looking for information and doing research but have yet to find something that I am able to understand.
photos.php
<?php
$lat = 32.2226;
$lng = -110.9747;
$flickr ='https://api.flickr.com/services/rest/?method=flickr.photos.search&api_key=d625f32e9ed8da3da9700a47b73d0dab&lat='.$lat.'&lon='.$lng.'&format=json&nojsoncallback=1';
$data = json_decode(file_get_contents($flickr));
$photos = $data->photos->photo;
foreach ($photos as $photo) {
$url = 'https://farm'.$photo->farm.'.staticflickr.com/'.$photo->server.'/'.$photo->id.'_'.$photo->secret.'.jpg';
echo '<img src="'.$url.'">';
}
?>
Code from my index.php file that contains my JS code and retrieves the latlng data from my database.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<link rel="stylesheet" href="style.css">
<title>My Google Map</title>
</head>
<body>
<div id="map">
<script>
var markers;
var map;
var circle;
var radius = 16093.4 * 5; //50 miles
var center = {lat:32.2226, lng:-110.9747}
var list;
function initMap(){
markers = [];
var options = {
zoom:8,
center: center
}
map = new google.maps.Map(document.getElementById('map'), options);
getMap();
initCircle();
}
function getMap(){
clearMarkers();
var ajax = new XMLHttpRequest();
var method = "GET";
var url = "locations.php";
var asynchronous = true;
ajax.open(method, url, asynchronous);
ajax.send();
ajax.onreadystatechange = function(){
if(this.readyState == 4 && this.status == 200){
var data = JSON.parse(this.responseText);
for(var i = 0; i < data.length; i++){
var tempLat = parseFloat(data[i].latitude);
var tempLong = parseFloat(data[i].longitude);
var latLng = {lat:tempLat, lng:tempLong};
addMarker({coords:{lat:tempLat, lng:tempLong},
type:data[i].cache_type,
difficulty:data[i].difficulty_rating});
console.log(latLng);
}
}
}
}
//Add Marker function
function addMarker(props){
list = document.getElementById("locationsPane").getElementsByTagName("ul")[0];
var marker = new google.maps.Marker({
position: props.coords,
map:map,
});
var infoWindow = new google.maps.InfoWindow({
content:"Cache Type: " + props.type + "<br>"
+ "Difficulty: " + props.difficulty
});
marker.addListener('click', function(){
infoWindow.open(map, marker);
})
UpdateMarkers(marker);
markers.push(marker);
addList(list, marker, props.type, props.difficulty);
}
//Initiate info window by clicking side bar item
function myclick(num){
google.maps.event.trigger(markers[num], "click");
}
function addList(list, marker, type, difficulty){
if(IsInside(marker.getPosition(), circle.getCenter(), circle.getRadius())){
var li = document.createElement("li");
list.appendChild(li);
li.innerHTML =
'<a href="javascript:myclick(' + (markers.length-1) + ')">'
+ "<b>Location:</b> "+ marker.getPosition().lat().toFixed(5)
+ ", " + marker.getPosition().lng().toFixed(5)
+ '<\/a><br>';
}
}
//Make circle
function initCircle(){
circle = new google.maps.Circle({
center:{lat:32.2226, lng:-110.9747},
radius: radius,
strokeColor: "#0000ff",
strokeOpacity: 0.6,
strokeWeight: 2,
fillColor: "#0000ff",
fillOpacity: 0.2
});
circle.setMap(map);
}
function setMapOnAll(map) {
for (var i = 0; i < markers.length; i++) {
markers[i].setMap(map);
}
}
function clearMarkers() {
setMapOnAll(null);
}
function clearList(){
list.innerHTML = '';
}
//Get selected index from distance drop-down
function getSelectedRad(){
radius = parseFloat(document.getElementById("radius").value);
circle.setRadius(getMeters(radius));
clearList();
getMap();
}
function getSelectedType(){
var ctype = document.getElementById("cachetype").value;
}
function getSelectedDifficulty(){
var difficultyLvl = document.getElementById("difficultylevel").value;
}
//Update map and circle center
function Update(){
clearList();
var lat = parseFloat(document.getElementById("latitude").value);
var lng = parseFloat(document.getElementById("longitude").value);
map.setCenter({lat:lat, lng:lng});
circle.setCenter({lat:lat, lng:lng});
getMap();
}
//Update markers - Ensure that they are within the radius
function UpdateMarkers(marker){
if(IsInside(marker.getPosition(), circle.getCenter(), circle.getRadius())){
marker.setVisible(true);
}else{
marker.setVisible(false);
}
}
//Convert miles to meters
function getMeters(i) {
return i*1609.344;
}
//Check the distance of a marker from the center then compare to the Radius
//If the distance is less than the radius then the marker is within the bounds
function IsInside(from, to, rad){
return google.maps.geometry.spherical.computeDistanceBetween(from, to) <= rad;
}
</script>
</div>
<div id="locationsPane">
<ul></ul>
</div>
<div id="text"></div>
<script async defer
src="https://maps.googleapis.com/maps/api/js?key=AIzaSyBQ2k7f0FjJNw9TAodJnTm93BHchk-M20E&callback=initMap">
</script>
</body>
</html>
Small sample of location data locations.php
[{"latitude":"32.40638805","0":"32.40638805","longitude":"-114.7141720","1":"-114.7141720","difficulty_rating":"9","2":"9","cache_type":"Multi-Cache","3":"Multi-Cache"},{"latitude":"31.93622796","0":"31.93622796","longitude":"-111.3468008","1":"-111.3468008","difficulty_rating":"9","2":"9","cache_type":"Traditional","3":"Traditional"},{"latitude":"32.79804490","0":"32.79804490","longitude":"-113.1862492","1":"-113.1862492","difficulty_rating":"7","2":"7","cache_type":"Multi-Cache","3":"Multi-Cache"},{"latitude":"36.98398611","0":"36.98398611","longitude":"-113.0198957","1":"-113.0198957","difficulty_rating":"8","2":"8","cache_type":"Multi-Cache","3":"Multi-Cache"},{"latitude":"31.57237360","0":"31.57237360","longitude":"-109.7067254","1":"-109.7067254","difficulty_rating":"9","2":"9","cache_type":"Mystery\/Puzzle","3":"Mystery\/Puzzle"},{"latitude":"32.40104817","0":"32.40104817","longitude":"-112.3002718","1":"-112.3002718","difficulty_rating":"5","2":"5","cache_type":"Multi-Cache","3":"Multi-Cache"},{"latitude":"33.40355909","0":"33.40355909","longitude":"-114.4468231","1":"-114.4468231","difficulty_rating":"1","2":"1","cache_type":"Mystery\/Puzzle","3":"Mystery\/Puzzle"},{"latitude":"33.41258752","0":"33.41258752","longitude":"-113.1261994","1":"-113.1261994","difficulty_rating":"7","2":"7","cache_type":"Multi-Cache","3":"Multi-Cache"},{"latitude":"31.48120332","0":"31.48120332","longitude":"-109.6336029","1":"-109.6336029","difficulty_rating":"4","2":"4","cache_type":"Traditional","3":"Traditional"},{"latitude":"36.65950176","0":"36.65950176","longitude":"-110.0774749","1":"-110.0774749","difficulty_rating":"2","2":"2","cache_type":"Mystery\/Puzzle","3":"Mystery\/Puzzle"},{"latitude":"33.16987671","0":"33.16987671","longitude":"-112.1256549","1":"-112.1256549","difficulty_rating":"5","2":"5","cache_type":"Multi-Cache","3":"Multi-Cache"},{"latitude":"35.22192709","0":"35.22192709","longitude":"-110.1382606","1":"-110.1382606","difficulty_rating":"5","2":"5","cache_type":"Traditional","3":"Traditional"}]
Again, all I really want to do at this point is to add the corresponding photos to each marker's info window. Basically, how can I pass the coordinates from the markers to the Flickr photo search?
Solution
One option would be to do an AJAX request to the flicker API using jquery when the Marker is clicked, then append the image(s) to the InfoWindow content.
marker.addListener('click', function(){
infoWindow.open(map, marker);
// request data from the flicker API
$.ajax("https://api.flickr.com/services/rest/?method=flickr.photos.search&api_key=d625f32e9ed8da3da9700a47b73d0dab&lat="+this.getPosition().lat()+"&lon="+this.getPosition().lng()+"&format=json&nojsoncallback=1", {
success: function(data) {
var photo = data.photos.photo[0];
var url = 'https://farm'+photo.farm+'.staticflickr.com/'+photo.server+'/'+photo.id+'_'+photo.secret+'.jpg';
$('#flickercontent').prepend('<img id="theImg" src="'+url+'" />')
},
error: function(jqXHR, textStatus, errorThrown) {
console.log("error "+textStatus+" "+errorThrown)
}
})
})
code snippet:
/* Always set the map height explicitly to define the size of the div
* element that contains the map. */
#map {
height: 90%;
}
/* Optional: Makes the sample page fill the window. */
html,
body {
height: 100%;
margin: 0;
padding: 0;
}<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div id="map"></div>
<script>
var markers;
var map;
var circle;
var radius = 16093.4 * 5; //50 miles
var center = {
lat: 32.2226,
lng: -110.9747
}
var list;
function initMap() {
markers = [];
var options = {
zoom: 8,
center: center
}
map = new google.maps.Map(document.getElementById('map'), options);
initCircle();
getMap();
}
function getMap() {
clearMarkers();
for (var i = 0; i < data.length; i++) {
var tempLat = parseFloat(data[i].latitude);
var tempLong = parseFloat(data[i].longitude);
var latLng = {
lat: tempLat,
lng: tempLong
};
addMarker({
coords: {
lat: tempLat,
lng: tempLong
},
type: data[i].cache_type,
difficulty: data[i].difficulty_rating
});
console.log(latLng);
}
}
//Add Marker function
function addMarker(props) {
list = document.getElementById("locationsPane").getElementsByTagName("ul")[0];
var marker = new google.maps.Marker({
position: props.coords,
map: map,
});
var infoWindow = new google.maps.InfoWindow({
content: "Cache Type: " + props.type + "<br>" +
"Difficulty: " + props.difficulty + "<br>" +
"<div id='flickercontent'></div>"
});
marker.addListener('click', function() {
console.log("click " + this.getPosition().toUrlValue(6))
infoWindow.open(map, marker);
$.ajax("https://api.flickr.com/services/rest/?method=flickr.photos.search&api_key=d625f32e9ed8da3da9700a47b73d0dab&lat=" + this.getPosition().lat() + "&lon=" + this.getPosition().lng() + "&format=json&nojsoncallback=1", {
success: function(data) {
// foreach ($photos as $photo) {
console.log(data);
var photo = data.photos.photo[0];
var url = 'https://farm' + photo.farm + '.staticflickr.com/' + photo.server + '/' + photo.id + '_' + photo.secret + '.jpg';
var img = new Image();
img.src = url;
$('#flickercontent').prepend('<img id="theImg" src="' + url + '" />')
// document.getElementById('flickercontent').appendElement(img);
},
error: function(jqXHR, textStatus, errorThrown) {
console.log("error " + textStatus + " " + errorThrown)
}
})
})
UpdateMarkers(marker);
markers.push(marker);
addList(list, marker, props.type, props.difficulty);
}
//Initiate info window by clicking side bar item
function myclick(num) {
google.maps.event.trigger(markers[num], "click");
}
function addList(list, marker, type, difficulty) {
// if (!circle || !circle.getCenter) return;
if (IsInside(marker.getPosition(), circle.getCenter(), circle.getRadius())) {
var li = document.createElement("li");
list.appendChild(li);
li.innerHTML =
'<a href="javascript:myclick(' + (markers.length - 1) + ')">' +
"<b>Location:</b> " + marker.getPosition().lat().toFixed(5) +
", " + marker.getPosition().lng().toFixed(5) +
'<\/a><br>';
}
}
//Make circle
function initCircle() {
circle = new google.maps.Circle({
center: {
lat: 32.2226,
lng: -110.9747
},
radius: radius,
strokeColor: "#0000ff",
strokeOpacity: 0.6,
strokeWeight: 2,
fillColor: "#0000ff",
fillOpacity: 0.2
});
circle.setMap(map);
}
function setMapOnAll(map) {
for (var i = 0; i < markers.length; i++) {
markers[i].setMap(map);
}
}
function clearMarkers() {
setMapOnAll(null);
}
function clearList() {
list.innerHTML = '';
}
//Get selected index from distance drop-down
function getSelectedRad() {
radius = parseFloat(document.getElementById("radius").value);
circle.setRadius(getMeters(radius));
clearList();
getMap();
}
function getSelectedType() {
var ctype = document.getElementById("cachetype").value;
}
function getSelectedDifficulty() {
var difficultyLvl = document.getElementById("difficultylevel").value;
}
//Update map and circle center
function Update() {
clearList();
var lat = parseFloat(document.getElementById("latitude").value);
var lng = parseFloat(document.getElementById("longitude").value);
map.setCenter({
lat: lat,
lng: lng
});
circle.setCenter({
lat: lat,
lng: lng
});
getMap();
}
//Update markers - Ensure that they are within the radius
function UpdateMarkers(marker) {
// if (!circle || !circle.getCenter) return;
if (IsInside(marker.getPosition(), circle.getCenter(), circle.getRadius())) {
marker.setVisible(true);
} else {
marker.setVisible(false);
}
}
//Convert miles to meters
function getMeters(i) {
return i * 1609.344;
}
//Check the distance of a marker from the center then compare to the Radius
//If the distance is less than the radius then the marker is within the bounds
function IsInside(from, to, rad) {
return google.maps.geometry.spherical.computeDistanceBetween(from, to) <= rad;
}
var data = [{
"latitude": "32.40638805",
"0": "32.40638805",
"longitude": "-114.7141720",
"1": "-114.7141720",
"difficulty_rating": "9",
"2": "9",
"cache_type": "Multi-Cache",
"3": "Multi-Cache"
}, {
"latitude": "31.93622796",
"0": "31.93622796",
"longitude": "-111.3468008",
"1": "-111.3468008",
"difficulty_rating": "9",
"2": "9",
"cache_type": "Traditional",
"3": "Traditional"
}, {
"latitude": "32.79804490",
"0": "32.79804490",
"longitude": "-113.1862492",
"1": "-113.1862492",
"difficulty_rating": "7",
"2": "7",
"cache_type": "Multi-Cache",
"3": "Multi-Cache"
}, {
"latitude": "36.98398611",
"0": "36.98398611",
"longitude": "-113.0198957",
"1": "-113.0198957",
"difficulty_rating": "8",
"2": "8",
"cache_type": "Multi-Cache",
"3": "Multi-Cache"
}, {
"latitude": "31.57237360",
"0": "31.57237360",
"longitude": "-109.7067254",
"1": "-109.7067254",
"difficulty_rating": "9",
"2": "9",
"cache_type": "Mystery\/Puzzle",
"3": "Mystery\/Puzzle"
}, {
"latitude": "32.40104817",
"0": "32.40104817",
"longitude": "-112.3002718",
"1": "-112.3002718",
"difficulty_rating": "5",
"2": "5",
"cache_type": "Multi-Cache",
"3": "Multi-Cache"
}, {
"latitude": "33.40355909",
"0": "33.40355909",
"longitude": "-114.4468231",
"1": "-114.4468231",
"difficulty_rating": "1",
"2": "1",
"cache_type": "Mystery\/Puzzle",
"3": "Mystery\/Puzzle"
}, {
"latitude": "33.41258752",
"0": "33.41258752",
"longitude": "-113.1261994",
"1": "-113.1261994",
"difficulty_rating": "7",
"2": "7",
"cache_type": "Multi-Cache",
"3": "Multi-Cache"
}, {
"latitude": "31.48120332",
"0": "31.48120332",
"longitude": "-109.6336029",
"1": "-109.6336029",
"difficulty_rating": "4",
"2": "4",
"cache_type": "Traditional",
"3": "Traditional"
}, {
"latitude": "36.65950176",
"0": "36.65950176",
"longitude": "-110.0774749",
"1": "-110.0774749",
"difficulty_rating": "2",
"2": "2",
"cache_type": "Mystery\/Puzzle",
"3": "Mystery\/Puzzle"
}, {
"latitude": "33.16987671",
"0": "33.16987671",
"longitude": "-112.1256549",
"1": "-112.1256549",
"difficulty_rating": "5",
"2": "5",
"cache_type": "Multi-Cache",
"3": "Multi-Cache"
}, {
"latitude": "35.22192709",
"0": "35.22192709",
"longitude": "-110.1382606",
"1": "-110.1382606",
"difficulty_rating": "5",
"2": "5",
"cache_type": "Traditional",
"3": "Traditional"
}];
</script>
<div id="locationsPane">
<ul></ul>
</div>
<div id="text"></div>
<!-- Replace the value of the key parameter with your own API key. -->
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