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Can't get GPS after login

the GPS code works fine as long as i take out the php code.
is there some kind of overlapping interference between php and javascript
any help would be greatly appreciated
<?php
// Initialize the session
session_start();
// Check if the user is logged in, if not then redirect him to login page
if(!isset($_SESSION["loggedin"]) || $_SESSION["loggedin"] !== true){
header("location: login.php");
exit;
}
else
{
}
?>
<button onclick="getLocation()">Try It</button>
<p id="demo"></p>
<script>
var x = document.getElementById("demo");
function getLocation() {
if (navigator.geolocation) {
navigator.geolocation.getCurrentPosition(showPosition);
function showPosition(position) { x.innerHTML = "Latitude: " + position.coords.latitude + "<br>Longitude: " + position.coords.longitude;}
} else {
x.innerHTML = "Geolocation is not supported by this browser.";
}
}
</script>

Kindly check out your settings for your website/localhost. I think the location is blocked by the your end.

Geolocation script not returning value

I am trying to use Javascript for finding user location but it is not giving me any value, my code is below
<script>
window.onload = function() {
var startPos;
var geoSuccess = function(position) {
startPos = position;
document.getElementById('startLat').innerHTML = startPos.coords.latitude;
document.getElementById('startLon').innerHTML = startPos.coords.longitude;
};
navigator.geolocation.getCurrentPosition(geoSuccess);
};
</script>
<?php echo "<script> getCurrentPosition('startLat') </script>"; ?>

The HTML5 Geolocation API allows you to get a user's Latitude/Longitude with some JavaScript (if the browser is compatible, and if the user allows access to his/her location).
You can then reverse-geocode the location to get an address, there are several free reverse-geocoding services other than Google's API.
you can also check out this link How to get geographical location of an IP address in PHP for more understanding
Example:
<script>
var x = document.getElementById("demo");
function getLocation() {
if (navigator.geolocation) {
navigator.geolocation.getCurrentPosition(showPosition);
} else {
x.innerHTML = "Geolocation is not supported by this browser.";
}
}
function showPosition(position) {
x.innerHTML = "Latitude: " + position.coords.latitude +
"<br>Longitude: " + position.coords.longitude;
}
</script>

If you have elements with id's "startLat" and "startLon" in your HTML, it'll work
Just add in HTML:
<p id="startLat"></p>
<p id="startLon"></p>
You can delete this line, actually:
<?php echo "<script> getCurrentPosition('startLat') </script>"; ?>

To use Latitude/Longitude in your PHP you can send the values via JS
In HTML
<script>
function sendData(value) {
var request = new XMLHttpRequest();
request.open('post', 'DESTINATION.PHP', true);
request.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
request.send('data=' + value);
}
</script>
Or as a hidden form input
and access in PHP
if(isset($_POST['data'])){
$data = $_POST['data'];
// Do stuff...
}

redirection using ajax with javascript variables passed in the url.

I am doing the following to pass the javascript variable from the view to
the controller:
default/rough2.html
{{extend 'layout.html'}}
<p id="demo">
</p>
<script>
var x=document.getElementById("demo");
jQuery(document).ready(function(){
geolocation();
})
function geolocation() {
if (navigator.geolocation) {
navigator.geolocation.getCurrentPosition(showPosition);
} else {
x.innerHTML = "Geolocation is not supported by this browser.";
}
}
function showPosition(position) {
var lat = position.coords.latitude;
var lon= position.coords.longitude;
ajax('{{=URL('default','rough3')}}'+'?lat='+lat+'&lon='+lon,[],':eval');
}
</script>
rough3() function
def rough3():
lat1=request.vars.lat
lon1=request.vars.lon
...........................
.......................
But it is "not getting redirected to rough3.html".I do not understand
why?Any help is highly appreciated!
Regards,
T

If you want to do a redirect via Javascript, just set window.location (an Ajax call does not load a new page in the browser window):
window.location = '{{=URL('default', 'rough3')}}' + '?lat=' + lat + '&lon=' + lon;

The entire point of Ajax is that it makes the HTTP request without leaving the current page.
If you want to go to a new URL, then assign it to location, don't use Ajax.

GeoLocation fetching wrong latitude longitude

I am trying to fetch the current location using the geolocation . A month before it was giving correct location but not am getting different location . I have used the same code as below.
function getLocation() {
if (navigator.geolocation) {
navigator.geolocation.getCurrentPosition(showPosition);
} else {
x.innerHTML = "Geolocation is not supported by this browser.";
}
}
function showPosition(position) {
/*x.innerHTML = "Latitude: " + position.coords.latitude +
"<br>Longitude: " + position.coords.longitude;
*/ var query = "?latitude="+position.coords.latitude+"&longitude="+position.coords.longitude;
var stateObj = { query: query };
history.pushState(stateObj, "query added", query);
var flag = true;
/*var req = (window.XMLHttpRequest)?new XMLHttpRequest():new ActiveXObject("Microsoft.XMLHTTP");
req.onreadystatechange=function(){if((r.readyState==4)&&(r.status==200)){ console.log('location was sended to server'); }};
req.open("GET","?latitude="+position.coords.latitude+"&longitude="+position.coords.longitude,true);
req.send(null);
*/
}
Another problem is its fetching the latlong based on isp not on IP. So if i use this code using mobile internet ! It gives latlong of another state. Is there any way to make this work again?

Load js function only once onload

I want this JS function to be called only once when the page is loaded .
function getLocation() {
if (navigator.geolocation) {
navigator.geolocation.getCurrentPosition(showPosition);
} else {
x.innerHTML = "Geolocation is not supported by this browser.";
}
}
function showPosition(position) {
x.innerHTML = "Latitude: " + position.coords.latitude +
"<br>Longitude: " + position.coords.longitude;
window.location.href = "? latitude="+position.coords.latitude+"&longitude="+position.coords.longitude;
var flag = true;
}

It's going into an infinite loop because you are redirecting the page with
window.location.href = "? latitude="+position.coords.latitude+"&longitude="+position.coords.longitude;
every time the page loads. Instead you could do something like this for showPosition():
function showPosition(position) {
x.innerHTML = "Latitude: " + position.coords.latitude +
"<br>Longitude: " + position.coords.longitude;
var query = "? latitude="+position.coords.latitude+"&longitude="+position.coords.longitude;
var stateObj = { query: query };
history.pushState(stateObj, "query added", query);
var flag = true;
}
This will add the query parameters to the URL without refreshing the page. For more details on history.pushState(), see https://developer.mozilla.org/en-US/docs/Web/Guide/API/DOM/Manipulating_the_browser_history

You can simply use the onload event handler:
<body onload="getLocation()">
This will fire as soon as the page is ready.
Alternatively, you can use jQuery's .ready()like this:
$(document).ready(function(){
getLocation();
});

Your code it's a big closure! It generate new request on this step:
window.location.href = "?latitude="+position.coords.latitude+"&longitude="+position.coords.longitude;
You can use different ways:
simple parse window.location.href on load and don't ask location if
(window.location.href.indexOf('?')!=-1)
mark client with browser data storage or coockies, and check it before ask location.
use Ajax for send location info to server:
var req = (window.XMLHttpRequest)?new XMLHttpRequest():new ActiveXObject("Microsoft.XMLHTTP");
req.onreadystatechange=function(){if((req.readyState==4)&&(req.status==200)){ console.log('location was sended to server'); }};
req.open("GET","?latitude="+position.coords.latitude+"&longitude="+position.coords.longitude,true);
req.send(null);