Question

I want to delete specific Markers from my database, I can save than with an “ID”, I wan’t to use the same ID to delete from database,

For example, if I save 20 waypoints, the id of each marker will be (1,2,3,…,20)

I want to use this value on JavaScript and delete a specific line from the table on PHP code,
For example, if I click on a marker on my project, it will automacally delete from map and from database, I have a code here:

EDITED WITH MY TRY

 function bindInfoWindow(marker, map, infoWindow, html, deleta) {

  google.maps.event.addListener(marker, 'click', function() {
    infoWindow.setContent(html);
    infoWindow.open(map, marker);


  });
   google.maps.event.addListener(marker, 'rightclick', function() 
       {    
           marker.setVisible(false) 
              alert(deleta)
              deleteMK(deleta)
    });


}

function deleteMK(deleta)
    {
        alert("vai");
         var url2 = "phpsqlinfo_addrow.php?deleta=" + deleta;   
    downloadUrl2(url2, function(data3, responseCode) 

    {
        if (responseText == 200 && data3.length <= 1) 
        {
            document.getElementById("message").innerHTML = "Deletado";
            window.location.reload()
        }
    });     
    }

    var string2 = JSON.stringify(data3)
//Função ajax que salva os marcadores no mapa
function downloadUrl2(url2, callback) 
{
    var request2 = window.XMLHttpRequest ? new XMLHttpRequest() : new ActiveXObject('Microsoft.XMLHTTP');
    request2.open('POST',url2);
    request2.setRequestHeader('Content-Type','application/x-www-form-urlencoded');
    request2.send('command=delete&marker='+string2)
    request2.onreadystatechange = function()
    {
        if(request2.readyState==4) 
        {   
            //infowindow.close();
            alert('Deletado')

        }
    }
}

PHP:

$deleta = $_REQUEST['deleta]'];

    if($_REQUEST['command']=='delete')
{
    $query = sprintf("DELETE FROM markers WHERE id='%s'",mysql_real_escape_string($deleta));



}

Answer 1

**What ever you do don’t use unescaped HTML in your query see tutorial

USE**

<?php  
 require("dbinfo.php");
// Get parameters from URL
 $id = $_GET["id"];
//Opens a connection to a mySQL server
$connection=mysql_connect ($host, $username, $password);
if (!$connection) {
  die("Not connected : " . mysql_error());
}
// Set the active mySQL database
$db_selected = mysql_select_db($database, $connection);
 if (!$db_selected) {
  die ("Can\'t use db : " . mysql_error());
}
// delete the row in the table
$query = sprintf("DELETE FROM *your table* WHERE *your field name*
echo "<br>";
echo $query;
$result = mysql_query($query);
 if (!$result) {
  die("Invalid query: " . mysql_error());
 }
?> 

You should also confirm delete in infobox

I assume you are now using ID column (atocomplete} as I suggested in comment