Question

I have a map on which I am plotting some random co-ordinates, co-ordinates being fed into a data table and is working fine

But now since I have been trying to set a panTo zoom feature on my map so that when any one of the markers are clicked then the map canvas slowly zooms in to the marker.
I am not able to set it properly.

So, How can I make this work? Any suggestions/answers are much appreciated..Thanks in advance.

My GPSLib Class:

public static class GPSLib
{
    public static String PlotGPSPoints(DataTable tblPoints)
    {
        try
        {
            String Locations = "";
            String sJScript = "";
            int i = 0;
            foreach (DataRow r in tblPoints.Rows)
            {
                // bypass empty rows 
                if (r["latitude"].ToString().Trim().Length == 0)
                    continue;

                string Latitude = r["latitude"].ToString();
                string Longitude = r["longitude"].ToString();

                // create a line of JavaScript for marker on map for this record 
                Locations += Environment.NewLine + @"
                path.push(new google.maps.LatLng(" + Latitude + ", " + Longitude + @"));

                var marker" + i.ToString() + @" = new google.maps.Marker({
                    position: new google.maps.LatLng(" + Latitude + ", " + Longitude + @"),
                    title: '#' + path.getLength(),
                    map: map
                });";
                i++;
            }

            // construct the final script
            // var cmloc = new google.maps.LatLng(33.779005, -118.178985);

            // map.panTo(curmarker.position); //zooming on current marker's posn.
            // map.panTo(myOptions.getPosition());
            sJScript = @"<script type='text/javascript'>

            var poly;
            var map;

            function initialize() {
                var cmloc = new google.maps.LatLng(28.483243, 77.107624);
                var myOptions = {
                    zoom: 19,
                    center: cmloc,
                    mapTypeId: google.maps.MapTypeId.ROADMAP
                };

                map = new google.maps.Map(document.getElementById('map_canvas'), myOptions);


                var polyOptions = {
                    strokeColor: 'blue',
                    strokeOpacity: 0.5,
                    strokeWeight: 3
                }
                poly = new google.maps.Polyline(polyOptions);
                poly.setMap(map);

                var path = poly.getPath();

               " + Locations + @"

                    }
                </script>";
            return sJScript;
        }
        catch (Exception ex)
        {
            throw ex;
        }
    }
}

and here is the aspx page’s onLoad() method which creates a data table containing co-ordinates:

protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            DataTable dt = new DataTable();
            dt.Columns.Add(new DataColumn("Latitude"));
            dt.Columns.Add(new DataColumn("Longitude"));

            DataRow row = dt.NewRow();
            row["Latitude"] = 28.483109;
            row["Longitude"] = 77.107756;
            dt.Rows.Add(row);

            row = dt.NewRow();
            row["Latitude"] = 28.483243;
            row["Longitude"] = 77.107624;
            dt.Rows.Add(row);

            row = dt.NewRow();
            row["Latitude"] = 28.483293;
            row["Longitude"] = 77.107579;
            dt.Rows.Add(row);

            row = dt.NewRow();
            row["Latitude"] = 28.483359;
            row["Longitude"] = 77.107536;
            dt.Rows.Add(row);

            row = dt.NewRow();
            row["Latitude"] = 28.483559;
            row["Longitude"] = 77.107273;
            dt.Rows.Add(row);

            //row = dt.NewRow();
            //row["Latitude"] = 28.4804;
            //row["Longitude"] = 77.1251;
            //dt.Rows.Add(row);

            js.Text = GPSLib.PlotGPSPoints(dt); ;
        }
    }

Answer 1

You just dont write map.panTo() after creating the marker, you ill need to use the click event of the marker inside which you should be writing the panTo().

After your foreach loop, write:

function myMark(rmarker)
{
    google.maps.event.addListener(rmarker,'click',function(){
      map.panTo(rmarker.getPosition());
    });
}

Call the above function in your foreach loop at the end:

var marker" + i.ToString() + @" = new google.maps.Marker({
                    position: new google.maps.LatLng(" + Latitude + ", " + Longitude + @"),
                    title: '#' + path.getLength(),
                    map: map
                });";
                i++;
 myMark(marker" + i.ToString() + @"); 
}

The above will help you out with your issue.

UPDATE: Here is a working demo that shows your functionality:

LIVE DEMO

See the coding pattern and you should be good to correct your mistakes.