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I am using Google Maps API3. I have a map and a button. On the map, I have two markers when I click on the button, then I want to draw a line between the two markers.

Not sure why you need Ajax with 2 markers and Google Maps API v3 Can draw a straight line between the two.

Something like this (play on the button click) should work with the correct names of marker 1 and marker 2: 

  var polyline = new google.maps.Polyline ({Path: [marker1.getPosition (), marker2.getPosition ()});   
 Check it in IE  
 In the address bar with:  
  Javascript: {var polyline = new google.maps (Path: [gunners [0] .getPosition (), gmarkers [1] .getPosition ()], map: map}}}

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