Getting Javascript variable value in PHP Variable using Ajax

Question

I want to store latitude and longitude values in PHP variables, but unable to do so. Here is my code. Can someone help me out here why these values are not getting stored in php variables:

Code:

<!DOCTYPE html>
<html>
<body onload="getLocation()">
<p id="demo"></p>
<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;
        var lat = position.coords.latitude;
        var longt = position.coords.longitude;
        $.ajax({
      type: 'POST',
      data: { latitude : lat, longitude : longt },
   });

}
        </script>
<?php
        $var = isset($_POST['latitude']);
        $var1 = isset($_POST['longitude']);
        echo $var;
        echo $var1;
?>
</body>
</html>

You need to understand the difference between client-side code and server-side code. AJAX sends new HTTP requests. — SLaks, Commented Aug 30, 2015 at 20:16

John Gibbons · Accepted Answer · 2015-08-30 22:34:58Z

1

assuming that lat and longt are getting set properly in your javascript (you could do a console.log check to make sure), it looks like you are setting your $var and $var1 variable to the result of the isset() function which returns either true or false, rather than the value of $_POST['latitude'] or $_POST['longitude']. I'm assuming you might have meant:

if (isset($_POST["latitude"])) {
  $var = $_POST['latitude'];
}

if (isset($_POST["longitude"])) {
  $var1 = $_POST['longitude'];
}

Hope that helps.

edited Aug 30, 2015 at 22:34

answered Aug 30, 2015 at 20:34

John Gibbons

3222 silver badges13 bronze badges

I can't edit this code, but the 2nd $var should be $var1, to avoid the 2nd overwriting the first
– Rob G
Commented Aug 30, 2015 at 22:28

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Subash · Accepted Answer · 2015-08-30 23:13:24Z

1

PHP isset() function returns a boolean value. From the documentation, the isset function is used to:

Determine if a variable is set and is not NULL

So in your case you are storing the return value of the function to the variable. It is either true or false.

So here is the corrected code:

if (isset($_POST["latitude"])) {
  $var = $_POST['latitude'];
}

if (isset($_POST["longitude"])) {
  $var1 = $_POST['longitude'];
}

answered Aug 30, 2015 at 23:13

Subash

7,2768 gold badges47 silver badges73 bronze badges

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