Question

Update
Sir this is current code of my web page.I made changes according to ur suggesstion but title is invisible or not displaying what has missed by me

  <script runat=server>

      Dim mgps As New Text.StringBuilder

      Public ReadOnly Property GPS() As String
          Get
              Return mgps.ToString

          End Get
      End Property
      Dim station As New Text.StringBuilder
      Public ReadOnly Property STA() As String
          Get
              Return station.ToString

          End Get
      End Property

  </script>  

  <%  Dim con As New OleDbConnection
      con = New OleDbConnection("Data Source=sml; User ID=sml; Password=sml; provider=OraOLEDB.Oracle")
      con.Open()
      Dim cmd As OleDbCommand = New OleDbCommand("Select STA_NAME, GPS_ONE from GPS", con)

      Dim ds As New DataSet
      Dim I As Long

      Dim da As New OleDbDataAdapter(cmd)
      da.Fill(ds, "GPS")
      mgps.AppendLine("[")
      For I = 0 To ds.Tables("GPS").Rows.Count - 1
          '   mgps.AppendLine("new google.maps.LatLng(" & ds.Tables("GPS").Rows(I).Item("GPS_ONE") & "),")
          mgps.AppendLine("{GPS:new google.maps.LatLng(" & ds.Tables("GPS").Rows(I).Item("GPS_ONE") & "), Sta_Name:'" & STA & "'},")
      Next I
      mgps.AppendLine("];")

      con.Close()
      %> 

Update2
And JS code is here

  for(i=0; i<GPS.length; i++)
{

      var image = 'ico/no.png';
      var infowindow = new google.maps.InfoWindow();
      var ContentString = GPS[i].TITLE
      markers[i] = new google.maps.Marker(
      { 
       position: GPS[i].GPS,
       map: map,
       draggable:true,
       icon:image,
       title:GPS[i].TITLE

       });                       
        google.maps.event.addListener(markers[i], 'click', function() {
        infowindow.setContent(ContentString);
        infowindow.open(map,markers[i]);
        });


}    

Sir My infowindow is not opening what may the issue

Answer 1

This depends on how you’re storing data in your GPS_ONE column in your GPS table, but if your for loop looks like this:

for(i=0; i<GPS.length-1; i++)
{

      var image = 'ico/no.png';
      markers[i] = new google.maps.Marker(
      { 
       position: GPS[i],
       map: map,
       draggable:true,
       icon:image,
       title: (i+1) + GPS //why is this here? do you have two variables with the same name or did you mean GPS[i]?
       });                             
}

and the data in your GPS_ONE column looks like this:

new google.maps.LatLng(31.204549793299,72.264183974237)

then what you wrote should be working.

EDIT: it looks like you’re not creating an array of google map latlng objects as per your example above. Try changing your loop in your vb to look like this:

    For I = 0 To ds.Tables("GPS").Rows.Count - 1
        mgps.AppendLine("new google.maps.LatLng(" & ds.Tables("GPS").Rows(I).Item("GPS_ONE") & "),")
    Next I

EDIT for second question:
You can store everything in a JSON object, so

    For I = 0 To ds.Tables("GPS").Rows.Count - 1
        mgps.AppendLine("{GPS:new google.maps.LatLng(" & ds.Tables("GPS").Rows(I).Item("GPS_ONE") & "), Title:'" & titleColumnSourceHere & "'},")
    Next I

Then you can use this JSON object like this:

for(i=0; i<GPS.length-1; i++)
{

      var image = 'ico/no.png';
      markers[i] = new google.maps.Marker(
      { 
       position: GPS[i].GPS,
       map: map,
       draggable:true,
       icon:image,
       title: GPS[i].Title
       });                             
}

Obviously I would recommend renaming your GPS variable to something more suitable because it now holds non-gps data