Passing Coordinates

The digitizing functions in the Viewer API provide us with the digitized coordinates on the client, but we usually need to pass them to a server side script. This can be done with the Viewer API, using the Submit() method of the formFrame.

function OnLineDigitized(line) {          
  // Send the Javascript variables to 'draw_line.php', 
  // via the form frame
  var params = new Array("x0", line.Point(0).X,
    "y0", line.Point(0).Y,
    "x1", line.Point(1).X,
    "y1", line.Point(1).Y,
    "SESSION", "<?= $sessionId ?>",
    "MAPNAME", "<?= $mapName ?>");
  parent.parent.formFrame.Submit(
    "/mapguide/samplesphp/digitizing_features/draw_line.php", 
    params, "scriptFrame");
}

This submits the coordinates to the server-side function to draw the line. It uses the hidden scriptFrame so the page output is not visible.