php - How do I pass Google maps lat and lng values and save to MySQL database? -

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i writing google maps application user can click want save marker filling form in infowindow , clicking submit button saves data mysql database.

a picture of mean here:

infowindow

i not know how retrieve lat , lng values event.latlng , use them part of addlocation form action.

the javascript contains addlocation form action:

function placemarker(location) {  var latlng = event.latlng; // don't know how retrieve lat & lng latlng?  var contentstring = '<form action="addlocation" method="post">' +     '<div id="addmarkerinfowindow">' +     '<b>name:</b>&nbsp;<input type="text" name="name"><br>' +     '<b>facilities:</b>&nbsp;<input type="text" name="facilities"><br>' +     '<b>opening hours:</b>&nbsp;<input type="text" name="opening"><br>' +     '<b>notes:</b>&nbsp;<input type="text" name="notes"><br></div>' +     '<br><br><input type="submit" value="submit">&nbsp;' +      '<input type="button" value="cancel" /></form>';  var infowindow = new google.maps.infowindow({     content: contentstring });  var marker = new google.maps.marker({     position: location,     map: map });  infowindow.open(map,marker);  }

this php code have:

(note: new php)

<?php  require("db_info.php");  // opens connection mysql server $connection = mysqli_connect('localhost', $username); if (!$connection) {     die('not connected : ' . mysqli_error()); }  // set active mysql database $db_selected = mysqli_select_db($connection, $database); if (!$db_selected) {     die('can\'t use db : ' . mysqli_error()); }  ################ save location #################  if($_post) //run if there's post data {     // make sure ajax request     $xhr = $_server['http_x_requested_with'] == 'xmlhttprequest';      if (!$xhr) {          header('http/1.1 500 error: request must come ajax!');          exit();      }      // inserting data order     $order = "insert markers (name, facilities, opening, lat, lng, notes)          values ('$name', '$facilities', $opening, '$lat', '$lng', '$notes')";      // declare in order variable     $result = mysql_query($order);  //order executes      if($result) {        echo("<br>input data succeed");     } else {        echo("<br>input data fail");     } }  ?>

you can update content string use hidden fields lat , lng

var contentstring = '<form action="addlocation" method="post">' +     '<input type="hidden" name="lat" value="' + location.lat() + '" />' +     '<input type="hidden" name="lng" value="' + location.lng() + '" />' +     '<div id="addmarkerinfowindow">' +     '<b>name:</b>&nbsp;<input type="text" name="name"><br>' +     '<b>facilities:</b>&nbsp;<input type="text" name="facilities"><br>' +     '<b>opening hours:</b>&nbsp;<input type="text" name="opening"><br>' +     '<b>notes:</b>&nbsp;<input type="text" name="notes"><br></div>' +     '<br><br><input type="submit" value="submit">&nbsp;' +      '<input type="button" value="cancel" /></form>';

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