Question

Hi all I need to return a results from PHP to Javascript.

Here is my PHP code and I need to form it to be used in javascript.

$result = dbMySql::Exec('SELECT Latitude,Longitude FROM data');
while ($row = mysqli_fetch_assoc($result))
   $coordinates[] = 'new google.maps.LatLng(' . $row['Latitude'] . ', ' . $row['Longitude'] . ')';

I need to return an array $coordinates and implode it like this but with Javascript:

var flightPlanCoordinates = [<?php echo implode(',', $coordinates) ?>];

This is how I started in javascript:

$.ajax({
        type: 'POST',
        url: 'history.php',
        data: {'query': url},
       });
var flightPlanCoordinates = [<?php echo implode(',', $coordinates) ?>];

And I need to fill this variable with returned data and with the JOIN or some other function that does same thing as implode in PHP.

EDIT:

This is my ajax code:

$.ajax({
                  type: 'POST',
                  url: 'history.php',
                  data: {
                  'id_user':$('#select-choice-user').val(),
                  'reg_id':$('#select-choice-reg').val(),
                  'd_year1':$('#select-choice-year1').val(),
                  'd_month1':   $('#select-choice-month1').val(),
                  'd_day1':$('#select-choice-day1').val(),
                  'd_year2':$('#select-choice-year2').val(),
                  'd_month2':   $('#select-choice-month2').val(),
                  'd_day2':$('#select-choice-day2').val()
                  },
                  success: function(data)//callback to be executed when the response has been received
                        {

                            for (var i=0;i<data.length;i++)
                            {
                                flightPlanCoordinates[i] = new google.maps.LatLng(data[i].x,data[i].y);
                            }
                        }
                });

These are returned values in JSON format:

[
    {
        "x": "46.5564266666667",
        "y": "15.6467166666667"
    },
    {
        "x": "46.5566583333333",
        "y": "15.6465533333333"
    },
    {
        "x": "46.5567416666667",
        "y": "15.6465566666667"
    },
    {
        "x": "46.556745",
        "y": "15.646555"
    },
    {
        "x": "46.5567366666667",
        "y": "15.6465766666667"
    },
    {
        "x": "46.55675",
        "y": "15.6465933333333"
    },
    {
        "x": "46.55677",
        "y": "15.6466116666667"
    },
    {
        "x": "46.5567766666667",
        "y": "15.6466183333333"
    },
    {
        "x": "46.5567783333333",
        "y": "15.64662"
    },
    {
        "x": "46.5567583333333",
        "y": "15.6466066666667"
    },
    {
        "x": "46.556725",
        "y": "15.6465966666667"
    },
    {
        "x": "46.5566983333333",
        "y": "15.6465983333333"
    }
]

I’ve checked in JSON validator and format is valid. So I have no idea what could be wrong.

I will put PHP code just to make sure that it is written as it should be:

$result = dbMySql::Exec($query);
while ($row = mysql_fetch_assoc($result))
{
    $coordinates[] = array('x' => $row['Latitude'], 'y' => $row['Longitude']);
}
echo json_encode($coordinates);//send as JSON object

Type of the errors that I get in the console:

Uncaught Error: Invalid value for constructor parameter 0: undefined   
Uncaught TypeError: Cannot set property '0' of undefined

Answer 1

Ok, reading the comments, it appears to be the case that var flightPlanCoordinates should be assigned the return value of an ajax call. In that case:

var flightPlanCoordinates = [];
$.ajax({type: 'POST',
        url: 'history.php',
        data: {'query': url},
        success: function(data)//callback to be executed when the response has been received
        {
            for (var i=0;i<data.length;i++)
            {
                flightPlanCoordinates[i] = new google.maps.LatLng(data[i].x,data[i].y);
            }
        }
    });

And, to avoid eval, just return the data like so:

while ($row = mysqli_fetch_assoc($result))
{
    $coordinates[] = array('x' => $row['Latitude'], 'y' => $row['Longitude']);
}
echo json_encode($coordinates);//send as JSON object

That should do the trick