Gmap 3- How to use Ajax Json Request for Markers + have click event?

Question

I am wondering how can I turn this

   $(function(){

        $('#test1').gmap3({
          map:{
            options:{
              center:[46.578498,2.457275],
              zoom: 5
            }
          },
          marker:{
            values:[
              {latLng:[48.8620722, 2.352047], data:"Paris !"},
              {address:"86000 Poitiers, France", data:"Poitiers : great city !"},
              {address:"66000 Perpignan, France", data:"Perpignan ! <br> GO USAP !", options:{icon: "http://maps.google.com/mapfiles/marker_green.png"}}
            ],
            options:{
              draggable: false
            },
            events:{
              mouseover: function(marker, event, context){
                var map = $(this).gmap3("get"),
                  infowindow = $(this).gmap3({get:{name:"infowindow"}});
                if (infowindow){
                  infowindow.open(map, marker);
                  infowindow.setContent(context.data);
                } else {
                  $(this).gmap3({
                    infowindow:{
                      anchor:marker, 
                      options:{content: context.data}
                    }
                  });
                }
              },
              mouseout: function(){
                var infowindow = $(this).gmap3({get:{name:"infowindow"}});
                if (infowindow){
                  infowindow.close();
                }
              }
            }
          }
        });
      });

To something where the markers are loaded via ajax? I also need the events to stay as the data(more that "great city") I need to pull is to big and needs to be in demand

I am guessing on the server side I will need something like

 public class Marker
    {
        public string Title { get; set; }
        public double Lat { get; set; }
        public double Lng { get; set; }
    }

Answer 1

A naive but (I think) perfectly serviceable solution would be to abstract the map initialisation logic into a function, let's call it initMap, which takes an array of markers as a parameter:

function initMap(markers) {
    $('#test1').gmap3({
      map:{
        options:{
          center:[46.578498,2.457275],
          zoom: 5
        }
      },
      marker:{
        values: markers || [], // Pass it an empty array if no markers are specified
        options:{
          draggable: false
        }

     ..............
}

You can now initialise the map on document ready (with either default marker data or none) and within the success handler for your AJAX call:

$('button').on('click', function() {
    $.ajax({
        url: 'marker.json'
    }).done(function(data) {
        // Re-initialise the map with loaded marker data
        initMap(data);
    });
});

You want the server to spit out JSON. Something like the following static example (which you could happily use to test until you get the back-end set up):

[
    { 
        "latLng":[48.8620722, 2.352047], 
        "data":"Paris !" },
    { 
        "address":"86000 Poitiers, France", 
        "data":"Poitiers : great city !" 
    },
    { 
        "address":"66000 Perpignan, France", 
        "data":"Perpignan ! <br> GO USAP !", 
        "options": {
            "icon": "http://maps.google.com/mapfiles/marker_green.png"
        }
    }
]

You could look into updating the markers more atomically as I'm sure the plugin will allow you to add / remove markers after it has been initialised, however the solution I've outlined may be good enough for your purposes.