Obtaining places based on proximity query against zip code - php

I'm having difficulty figuring out how to accomplish a specific type of Google Places API request.
I have a zipcode and i want to find out if there are any hospitals within 20 miles of the zipcode
I found the following example maps code and changed the request to hospitals but that didnt perform what i wanted.
So, to summarize, i just want an api request i can convert to PHP that contains an array of available hospitals within 20 miles of a zip code else an empty array. I could also take as an output just a boolean of yes hospitals exist or false otherwise
var sydney = new google.maps.LatLng(-33.867, 151.195);
infowindow = new google.maps.InfoWindow();
map = new google.maps.Map(
document.getElementById('map'), {center: sydney, zoom: 15});
var request = {
query: 'hospitals',
fields: ['name', 'geometry'],
};
service = new google.maps.places.PlacesService(map);
service.findPlaceFromQuery(request, function(results, status) {
if (status === google.maps.places.PlacesServiceStatus.OK) {
for (var i = 0; i < results.length; i++) {
createMarker(results[i]);
}
map.setCenter(results[0].geometry.location);
}
});
}
function createMarker(place) {
var marker = new google.maps.Marker({
map: map,
position: place.geometry.location
});
google.maps.event.addListener(marker, 'click', function() {
infowindow.setContent(place.name);
infowindow.open(map, this);
});
}

The Nearby Search or Text Search services would be more appropriate for your use case, since you want to get multiple hospitals and not just one (Find Place returns a single place only).
Try the below code sample which displays hospitals within 20 miles of Pyrmont NSW 2009. Note that location must be a LatLng object, it can't be a zip code, but with Text Search you can add it to your query. Then set the type to hospital.
var map;
var service;
function initialize() {
var pyrmont = new google.maps.LatLng(-33.8665433,151.1956316);
map = new google.maps.Map(document.getElementById('map'), {
center: pyrmont,
zoom: 13
});
var request = {
location: pyrmont,
radius: '32186',
query: '2009',
type: 'hospital'
};
service = new google.maps.places.PlacesService(map);
service.textSearch(request, callback);
}
function callback(results, status) {
if (status == google.maps.places.PlacesServiceStatus.OK) {
for (var i = 0; i < results.length; i++) {
var place = results[i];
createMarker(results[i]);
}
}
}
function createMarker(place) {
var marker = new google.maps.Marker({
map: map,
position: place.geometry.location,
title: place.name
});
google.maps.event.addListener(marker, 'click', function() {
infowindow.setContent(place.name);
infowindow.open(map, this);
});
}
Hope this helps!

Related

Marker Cluster for data from MYSQL DB - Google Maps API

I have tried implementing a marker cluster into my code from the Google Developers Documentation but no joy so far. https://developers.google.com/maps/documentation/javascript/marker-clustering
Here is the snippet of code from my .JS file paying attention to the function showAllCustomers(allData) where I want to implement the Marker Clusterer:
var map;
var geocoder;
//Code to load the map with center point of Monterey MA
function initMap() {
var monterey = {lat: 42.181613, lng: -73.215013};
map = new google.maps.Map(document.getElementById('map'), {
zoom: 10,
center: monterey,
mapTypeId: google.maps.MapTypeId.HYBRID,
labels: true,
});
//collect customer data and geocoder object - declare geocoder as global
var cusdata = JSON.parse(document.getElementById('data').innerHTML);
geocoder = new google.maps.Geocoder();
codeAddress(cusdata);
var allData = JSON.parse(document.getElementById('allData').innerHTML);
showAllCustomers(allData)
var searchData = JSON.parse(document.getElementById('searchData').innerHTML);
showSearchedCustomer(searchData)
}
function showAllCustomers(allData) {
//declare info window variable outside of loop to allow to clear when selecting other markers
var infoWind = new google.maps.InfoWindow;
Array.prototype.forEach.call(allData, function(data){
var content = document.createElement('div');
var strong = document.createElement('strong');
strong.textContent = [data.lastName + ' ' + data.physicalAddress];
content.appendChild(strong);
//add image to infowindow - you are also able to add image path to mysql and then append dynamically
var img = document.createElement('img');
img.src = 'images/santahat.png';
img.style.width = '50px';
content.appendChild(img);
//Create markers for customer locations and customize
var iconBase = 'https://maps.google.com/mapfiles/kml/shapes/';
var marker = new google.maps.Marker({
position: new google.maps.LatLng(data.latitude, data.longitude),
map: map,
icon: iconBase + 'homegardenbusiness.png'
});
// Add event listener to open info window and show customer name
marker.addListener('mouseover', function(){
infoWind.setContent(content);
infoWind.open(map, marker);
//add event listener to zoom in to clicked customer
google.maps.event.addListener(marker, 'click', function() {
map.panTo(this.getPosition());
map.setZoom(20);
});
});
})
}
Here is my attempt to add the MarkerClusterer (code same as previous up to this point):
//Create markers for customer locations and customize
var iconBase = 'https://maps.google.com/mapfiles/kml/shapes/';
var marker = new google.maps.Marker({
position: new google.maps.LatLng(data.latitude, data.longitude),
map: map,
icon: iconBase + 'homegardenbusiness.png'
});
//create marker clusterer to group data
var markerCluster = new MarkerClusterer(map, [], {
imagePath: 'https://developers.google.com/maps/documentation/javascript/examples/markerclusterer/m'
});
// Add event listener to open info window and show customer name
marker.addListener('mouseover', function(){
infoWind.setContent(content);
infoWind.open(map, marker);
//add event listener to zoom in to clicked customer
google.maps.event.addListener(marker, 'click', function() {
map.panTo(this.getPosition());
map.setZoom(20);
});
});
markerCluster.addMarker(marker);
})
}
Functioning JS file:
var map;
var geocoder;
//Code to load the map with center point of Monterey MA
function initMap() {
var monterey = {lat: 42.181613, lng: -73.215013};
map = new google.maps.Map(document.getElementById('map'), {
zoom: 10,
center: monterey,
mapTypeId: google.maps.MapTypeId.HYBRID,
labels: true,
});
//collect customer data and geocoder object - declare geocoder as global
var cusdata = JSON.parse(document.getElementById('data').innerHTML);
geocoder = new google.maps.Geocoder();
codeAddress(cusdata);
var allData = JSON.parse(document.getElementById('allData').innerHTML);
showAllCustomers(allData);
var searchData = JSON.parse(document.getElementById('searchData').innerHTML);
showSearchedCustomer(searchData)
}
function showAllCustomers(allData) {
//declare info window variable outside of loop to allow to clear when selecting other markers
var infoWind = new google.maps.InfoWindow;
//Create marker clusterer to group data
var markerCluster = new MarkerClusterer(map, [], {
imagePath: 'https://developers.google.com/maps/documentation/javascript/examples/markerclusterer/m'
});
Array.prototype.forEach.call(allData, function(data){
var content = document.createElement('div');
var strong = document.createElement('strong');
strong.textContent = [data.lastName + ' ' + data.physicalAddress];
content.appendChild(strong);
//add image to infowindow - you are also able to add image path to mysql and then append dynamically
var img = document.createElement('img');
img.src = 'images/santahat.png';
img.style.width = '50px';
content.appendChild(img);
//Create markers for customer locations and customize
var iconBase = 'https://maps.google.com/mapfiles/kml/shapes/';
var marker = new google.maps.Marker({
position: new google.maps.LatLng(data.latitude, data.longitude),
map: map,
icon: iconBase + 'homegardenbusiness.png'
});
markerCluster.addMarker(marker);
// Add event listener to open info window and show customer name
marker.addListener('mouseover', function(){
infoWind.setContent(content);
infoWind.open(map, marker);
//add event listener to zoom in to clicked customer
google.maps.event.addListener(marker, 'click', function() {
map.panTo(this.getPosition());
map.setZoom(20);
});
});
})
}
//google maps geocoding code for address to collect lat lng from customer addresses
function codeAddress(cusdata) {
Array.prototype.forEach.call(cusdata, function(data){
var address = data.lastName + ' ' + data.physicalAddress;
geocoder.geocode( { 'address': address}, function(results, status) {
if (status == 'OK') {
map.setCenter(results[0].geometry.location);
//create object that collects the lat and lng data and pass function to update customers lat lng
var points = {};
points.id = data.id;
points.latitude = map.getCenter().lat();
points.longitude = map.getCenter().lng();
updateCustomersWithLatLng(points);
//add code to check the result status from geocode request and if we get an OVER_QUERY_LIMIT error we try again after slight delay // Jay 20201208-1015
} else if (status === google.maps.GeocoderStatus.OVER_QUERY_LIMIT) {
setTimeout(function() {
codeAddress(cusdata);
}, 100);
} // else {
// alert("Geocode was not successful for the following reason:"
// + status);
// }
});
});
}
//create update customers function that updates db using ajax call
function updateCustomersWithLatLng(points) {
$.ajax({
url:"action.php",
method:"post",
data: points,
success: function(res) {
console.log(res)
}
})
}
//When search customers is clicked create function to zoom in to the searched customer
function showSearchedCustomer(searchData) {
// var searchedCus = { ? };
// map = new google.maps.Map(document.getElementById("map"), {
// zoom: 20,
// center: searchedCus,
// });
//declare info window vairable outside of loop to allow to clear if selecting other markers
var infoWind = new google.maps.InfoWindow;
Array.prototype.forEach.call(searchData, function(data){
var content = document.createElement('div');
var strong = document.createElement('strong');
strong.textContent = [data.lastName + ' ' + data.physicalAddress];
content.appendChild(strong);
//add image to infowindow - you are also able to add image path to mysql and then append dynamically
var img = document.createElement('img');
img.src = 'images/santahat.png';
img.style.width = '50px';
content.appendChild(img);
//Create marker for searched customer location and customize
var iconBase = 'https://maps.google.com/mapfiles/kml/shapes/';
var marker = new google.maps.Marker({
position: new google.maps.LatLng(data.latitude, data.longitude),
map: map,
icon: iconBase + 'homegardenbusiness.png'
});
// Add event listner to open info window and show customer name
marker.addListener('mouseover', function(){
infoWind.setContent(content);
infoWind.open(map, marker);
});
});
}

Reverse Geocode On Google Maps api v3

I wonder whether someone may be able to help me please.
I using the code shown below to correctly plot markers retrieved from a MySQL database on a Google Map.
<script type="text/javascript">
//Sample code written by August Li
var icon = new google.maps.MarkerImage("images/location-marker-2.png")
new google.maps.Point(16, 32);
var center = null;
var map = null;
var bounds = new google.maps.LatLngBounds();
function addMarker(lat, lng, info) {
var pt = new google.maps.LatLng(lat, lng);
bounds.extend(pt);
var marker = new google.maps.Marker({
position: pt,
icon: icon,
map: map
});
}
function initMap() {
map = new google.maps.Map(document.getElementById("gmaps-canvas"), {
center: new google.maps.LatLng(0, 0),
zoom: 6,
scrollwheel: true,
draggable: true,
mapTypeId: google.maps.MapTypeId.SATELLITE
});
<?php
include("admin/link.php");
include("admin/opendb.php");
$query = mysql_query("SELECT * FROM `detectinglocations` WHERE `locationid` = '$lid'");
while ($row = mysql_fetch_array($query)){
$locationname=$row['locationname'];
$osgb36lat=$row['osgb36lat'];
$osgb36lon=$row['osgb36lon'];
echo ("addMarker($osgb36lat, $osgb36lon,'<b>$locationname</b><br/>');\n");
}
mysql_close($connect);
?>
center = bounds.getCenter();
map.fitBounds(bounds);
}
</script>
What I'm now trying to do is add further functionality that allows users to also click on the map to plot new markers, in essence using the pre-existing marker from the database as a point to work from, performing a reverse geocode.
I've been researching this for a number of days now and I've tried to implement a whole host of tutorials, but I just can't seem to get both parts of the functionality working.
I do know that to enable a on-click event I need to incorporate something along the lines of:
google.maps.event.addListener(map, 'click', function(event) {
marker.setPosition(event.latLng)
geocode_lookup( 'latLng', event.latLng );
});
}
but I must admit I'm a little unsure about what else I need to incorporate.
I just wondered whether someone may be able to take a look at this please, and I'd be very grateful if someone could show me where I've gone wrong.
Many thanks and kind regards
I wrote a separate maps page with just click-to-reverse-geocode functionality
http://jsfiddle.net/ZDQeM/
The address details are confusing to work with, I think. The results are an array, at different levels of precision, one might include the county, another the state, another the street address. Generally I only use results[0]. The details are in the docs: https://developers.google.com/maps/documentation/javascript/geocoding#GeocodingResponses
If you need specific information the sure way to obtain it is iterate through the whole results array until you find what you need (types[] containing postal_code, for example).
google.maps.event.addListener(map, 'click', function(event) {
userMarker = new google.maps.Marker({
map: map,
position: event.latLng
});
geocoder.geocode({'latLng': event.latLng}, function(results, status) {
if(status == google.maps.GeocoderStatus.OK) {
if (results[0]) {
alert(results[0].formatted_address);
}
else {
alert("No results");
}
}
else {
alert("Geocoding unsuccessful: Status " + status);
}
});
});
Where in your code?
<script type="text/javascript">
//Sample code written by August Li
var icon = new google.maps.MarkerImage("images/location-marker-2.png")
new google.maps.Point(16, 32);
var center = null;
var map = null;
var bounds = new google.maps.LatLngBounds();
function addMarker(lat, lng, info) {
var pt = new google.maps.LatLng(lat, lng);
bounds.extend(pt);
var marker = new google.maps.Marker({
position: pt,
icon: icon,
map: map
});
}
function initMap() {
map = new google.maps.Map(document.getElementById("gmaps-canvas"), {
center: new google.maps.LatLng(0, 0),
zoom: 6,
scrollwheel: true,
draggable: true,
mapTypeId: google.maps.MapTypeId.SATELLITE
});
<?php
include("admin/link.php");
include("admin/opendb.php");
$query = mysql_query("SELECT * FROM `detectinglocations` WHERE `locationid` = '$lid'");
while ($row = mysql_fetch_array($query)){
$locationname=$row['locationname'];
$osgb36lat=$row['osgb36lat'];
$osgb36lon=$row['osgb36lon'];
echo ("addMarker($osgb36lat, $osgb36lon,'<b>$locationname</b><br/>');\n");
}
mysql_close($connect);
?>
center = bounds.getCenter();
map.fitBounds(bounds);
var geocoder = new google.maps.Geocoder();
google.maps.event.addListener(map, 'click', function(event) {
var userMarker = new google.maps.Marker({
map: map,
position: event.latLng
});
geocoder.geocode({'latLng': event.latLng}, function(results, status) {
if(status == google.maps.GeocoderStatus.OK) {
if (results[0]) {
alert(results[0].formatted_address);
}
else {
alert("No results");
}
}
else {
alert("Geocoding unsuccessful: Status " + status);
}
});
});
}
</script>

Distance between a searched address and nearest existing placemark on a google maps api v3

I'm developing a web page with a Google Maps API v3. I currently have a functional map and search bar. I need to be able to display the distance from a searched address to the nearest placemark on one of the KML files on the map. How can I do this?
Here is the code for the page:
<script type="text/javascript">
var geocoder;
var map;
var marker;
var layers = [];
function initialize() {
geocoder = new google.maps.Geocoder ();
var latlng = new google.maps.LatLng (41, -73.4);
var myOptions = {
zoom: 7,
center: latlng,
mapTypeId: google.maps.MapTypeId.ROADMAP
}
map = new google.maps.Map(document.getElementById("map_canvas"),
myOptions);
marker = new google.maps.Marker({map:map});
layers[0] = new google.maps.KmlLayer('http://dl.dropbox.com/u/80233620/South-and-North-County-Trailway.kml',
{preserveViewport: true});
layers[1] = new google.maps.KmlLayer('http://www.nyc.gov/html/dot/downloads/misc/cityracks.kml',
{preserveViewport: true});
layers[2] = new google.maps.KmlLayer('http://dl.dropbox.com/u/80233620/NWS%20Radar%20Images.kmz',
{preserveViewport: true});
for (var i = 0; i < layers.length; i++) {
layers[i].setMap(map);
}
}
function codeAddress () {
var address = document.getElementById ("address").value;
geocoder.geocode ( { 'address': address}, function(results, status) {
if (status == google.maps.GeocoderStatus.OK) {
map.setCenter(results [0].geometry.location);
marker.setPosition(results [0].geometry.location);
map.setZoom(14);
}
else {
alert("Geocode was not successful for the following reason: " + status);
}
});
}
function toggleLayer(i) {
if(layers[i].getMap() === null) {
layers[i].setMap(map);
}
else {
layers[i].setMap(null);}
}
</script>
You cannot access the data in KML layers like that
https://developers.google.com/maps/documentation/javascript/layers#KMLLayers
Because KML may include a large number of features, you may not access
feature data from the KmlLayer object directly. Instead, as features
are displayed, they are rendered to look like clickable Maps API
overlays.
Instead you can process the XML and add markers manually, then use the geometry library and computeDistanceBetween() to get the distance. I usually multiply the distance by some number to account for turns (The distance formula gets a straight line distance). I believe around 1.2 was the most accurate.

Getting error when trying to pass values from array to Google Maps Object

Im setting some json using wordpress post data on a page and then passing that json to some JS which loops through and adds markers to a map. I'm so close to getting it working, just need to figure out this last part.
My PHP code to create the json from an array:
<script type="text/javascript">
var markers = <?php echo json_encode($pageposts);?>
</script>
Here is my JS code:
var infowindow = null;
$(document).ready(function(){
initialize();
});
function initialize() {
var centerMap = new google.maps.LatLng(41.141208, -73.263726);
var options = {
zoom: 12,
center: centerMap,
mapTypeId: google.maps.MapTypeId.ROADMAP
}
var map = new google.maps.Map(document.getElementById('map'), options);
setMarkers(map, markers);
infowindow = new google.maps.InfoWindow({
content: "loading..."
});
}
function setMarkers(map, markers) {
for (var i = 0; i < markers.length; i++) {
var marker = new google.maps.Marker({
position: new google.maps.LatLng(markers[i].meta_value),
map: map
});
var contentString = "Some content";
google.maps.event.addListener(marker, "click", function () {
//infowindow.setContent(this.html);
//infowindow.open(map, this);
});
}
}
If you want to see the page, with the json embedded - check out this link:
http://www.fairfieldctguide.com/test-map
view-source:http://www.fairfieldctguide.com/test-map
Any help would be greatly appreciated!
Jake
google.maps.LatLng expects two numbers as an argument. Currently you are passing in a string which will result in an error. So you need to convert your markers[i].metavalue to two numbers like so:
function setMarkers(map, markers) {
for (var i = 0; i < markers.length; i++) {
latlng = markers[i].meta_value.split(",")
lat = parseFloat(latlng[0])
lng= parseFloat(latlng[1])
var marker = new google.maps.Marker({
position: new google.maps.LatLng(lat, lng),
map: map
});
var contentString = "Some content";
google.maps.event.addListener(marker, "click", function () {
//infowindow.setContent(this.html);
//infowindow.open(map, this);
});
}
}
If you don't want to do a converson you could just store lat and lng values as numbers in separate properties. So your json would look like this:
var markers = [{
"ID":"883",
"post_title":"Tucker's Cafe",
"meta_key":"meta_geo",
"lat":41.1674377,
"lng": -73.2236554
}
and you would add a marker like so:
var marker = new google.maps.Marker({
position: new google.maps.LatLng(markers[i].lat, markers[i].lng),
map: map
});

Google Maps API v3 - PHP - MYSQL

GOOGLE MAPS API V3 is what i'm trying to use.
I have all the coordinates in mysql. I just, for example, need to take 5 listings and put them on a map but I'd like to be able to find the center point based on the multiple coordinates I'd like to display, and the zoom level as well. Yeah know?
I'm having the time of my life with something that I know is terribly simple, I just can't figure this API out. I'll paypal $20 to anyone who can help me.
//select * from mysql limit 5
//ok great we got 5 results, great job, format the 5 results so google maps like it, [name,lat,lng] whatever.
//put them on the map and let them be clickable so i can put stuff in the infowindow thing
//make the map adjust to the proper zoom level and center point
UPDATE
This is what i was looking for, hope this helps others.
credit to [Chris B] for the common sense math formula for getting the center coord, the sw cord is the lowest lat and lon, and the ne coord is the greatest lat and lon
sort($lat)&&sort($lon);
$r['c'] = array_sum($lat)/count($lat).', '.array_sum($lon)/count($lon);
$r['ne'] = $lat[count($lat)-1].', '.$lon[count($lon)-1];
$r['sw'] = $lat[0].', '.$lon[0];
var myOptions = {zoom:4,center: new google.maps.LatLng(<?php echo $r['c']; ?>),mapTypeId:google.maps.MapTypeId.ROADMAP}
var map = new google.maps.Map(document.getElementById("map_canvas"),myOptions);
<?php foreach($x as $l) echo 'new google.maps.Marker({position:new google.maps.LatLng('.$l['lat'].','.$l['lon'].'),map:map,clickable:true});'; ?>
map.fitBounds(new google.maps.LatLngBounds(new google.maps.LatLng(<?php echo $r['sw']; ?>),new google.maps.LatLng(<?php echo $r['ne']; ?>)));
If an average/weighted center point is acceptable - you could just average all the latitudes, and average all the longitudes:
$latTotal = 0;
$lngTotal = 0;
foreach ($markers as $marker) {
$latTotal += $marker['lat'];
$lngTotal += $marker['lng'];
}
$centerLat = $latTotal/count($markers);
$centerLng = $lngTotal/count($markers);
For the rest of it, there are some good V3 tutorials on Google.
I was using Google Maps v3 a month or two back, but switched to v2 later on. However, I had the same problem as you so I wrote a MarkerManager class for API v3. I can't find the latest version of my class, but I did find a, hopefully, working one. You can get it here.
I have to warn you though - it's not optimazed at all and is not using overlays, so when I tried putting 50+ markers in the manager and toggled the hide/show the class is sloooow... But maybe you can have some success with it.
Usage example:
var map = new google.maps.Map(document.getElementById('MapLayerId'), {
zoom: 7,
position: new google.maps.LatLng(latitude, longitude),
mapTypeId: google.maps.MapTypeId.ROADMAP
});
var marker1 = new google.maps.Marker({
position: new google.maps.LatLng(latitude, longitude),
map: map
});
var marker2 = new google.maps.Marker({
position: new google.maps.LatLng(latitude, longitude),
map: map
});
var manager = new MarkerManager(map, {fitBounds: true});
manager.add(marker1);
manager.add(marker2);
manager.show();
GDownloadUrl in V2 equivalent downloadUrl in GOOGLE MAPS API V3
How to load all the coordinates in database(Mysql or Sql).
var myLatlng = new google.maps.LatLng("37.427770" ,"-122.144841");
var myOptions = {zoom: 15, center: myLatlng, mapTypeId: google.maps.MapTypeId.ROADMAP,}
map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);
var url='marker.php?arg1=x&arg2=y...';
downloadUrl(url, function(data) {
var markers = data.documentElement.getElementsByTagName("marker");
for (var i = 0; i < markers.length; i++) {
var latlng = new google.maps.LatLng(parseFloat(markers[i].getAttribute("lat")),
parseFloat(markers[i].getAttribute("lng")));
var marker = new google.maps.Marker({position: latlng, map: map});
}
});
function createXmlHttpRequest() {
try {
if (typeof ActiveXObject != 'undefined') {
return new ActiveXObject('Microsoft.XMLHTTP');
} else if (window["XMLHttpRequest"]) {
return new XMLHttpRequest();
}
} catch (e) {
changeStatus(e);
}
return null;
};
function downloadUrl(url, callback) {
var status = -1;
var request = createXmlHttpRequest();
if (!request) {
return false;
}
request.open('GET', url);
request.onreadystatechange = function() {
if (request.readyState == 4) {
try {
status = request.status;
} catch (e) {
// Usually indicates request timed out in FF.
}
if (status == 200) {
var s=request.responseText;
callback( xmlParse(s) );
}
}
}
try {
request.send(null);
}catch (e) {
changeStatus(e);
}
};
function xmlParse(str) {
if (typeof ActiveXObject != 'undefined' && typeof GetObject != 'undefined') {
var doc = new ActiveXObject('Microsoft.XMLDOM');
doc.loadXML(str);
return doc;
}
if (typeof DOMParser != 'undefined') {
return (new DOMParser()).parseFromString(str, 'text/xml');
}
return createElement('div', null);
}
Have you checked out the official google map PHP/Mysql tutorial?
http://code.google.com/apis/maps/articles/phpsqlajax.html
Try this algorithm for finding the centroid of a polygon:
http://tog.acm.org/resources/GraphicsGems/gemsiv/centroid.c

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