title: About ajax post data to PHP
body: <p>I'm newbie to Ajax, I know when I want to pass data to PHP file I need to use Ajax, but I not sure the Ajax can use like what I coded. If can't, anybody can help me on this? Cause I want to use the html5 geolocation to get the user location. I tried geoplugin before but the IP I get always is the server IP not the user IP, I got try to ask here for the geoplugin but no work. I have tried this html5 geolocation to display my lon and lat, it is correct one, but I want to pass the variable to another PHP file for calculate the nearest distance with data get from MySQL. </p>
  
  <p>In index.php</p>
  
  <pre><code>&lt;script&gt;
  $(document).ready(function(){
  if (navigator.geolocation) {
      navigator.geolocation.getCurrentPosition(showLocation);
  } else { 
      $('#location').html('Geolocation is not supported by this browser.');
  }
  });
  
  function showLocation(position) {
  var latitude = position.coords.latitude;
  var longitude = position.coords.longitude;
  $.ajax({
      type:'POST',
      url:'index1.php',
      data:'latitude='+latitude+'&amp;longitude='+longitude
      }
  });
  }
  &lt;/script&gt;
  </code></pre>
  
  <p>In index1.php</p>
  
  <pre><code>&lt;?php
  session_start();
  $link=mysqli_connect("localhost","id2135226_ukwai1203","ukwai1203");
  mysqli_select_db($link,"id2135226_demo");
  $lat=$_POST['latitude'];
  $lon=$_POST['longitude'];
  $sql = "select branch_id,(6371 * 2 * ASIN(SQRT( POWER(SIN(($lat - 
  branch_lat)*pi()/180/2),2)+COS($lat*pi()/180 
  )*COS(branch_lat*pi()/180)*POWER(SIN(($lon-branch_lon)*pi()/180/2),2)))) 
  as 
  distance From Branch ORDER BY distance ASC LIMIT 1";
  $res=mysqli_query($link,$sql);
  while($row=mysqli_fetch_array($res)){
  $_SESSION['location']=$row['branch_id'];
  ?&gt;
  &lt;script&gt;
  
  window.location="http://ukwai1203.000webhostapp.com/fyp/user/shop.php";
  &lt;/script&gt;
  &lt;?php
  }
  ?&gt;
  </code></pre>