How to pass javascript variable into embeded ruby?

Question

I'm developing a Rails app with Leaflet. I have model Pipe with field location that is type linestring. I want to be able to click on the map, get the coordinates of that spot and return number of pipes that are at certain distance of it. I can't return coordinates to Ruby. I realize that Ruby gets executed before Javascript, so how do I do it? This is the function in my .js.erb file:

 function onMapClick(e) {
 var sql = <%= Pipe.where{st_dwithin((location),ST_GeomFromText("POINT(#{e.latlng.lat} #{e.latlon.lon})", 4326), 3000)}.count.to_s %>;
 map.openPopup(sql.toString(), e.latlng);
 };

Answer 1

In order to pass data from JavaScript to the server you have to make an ajax call

• ivanacorovic: Could you show me an example? Do I need to make it return .json somewhere?
• TGH: You could maybe find some help here stackoverflow.com/questions/7237720/jquery-post-to-rails
• ivanacorovic: function onMapClick(e) { $.ajax({ url: "/temps", type: "POST", data: {coordinates: {lat: e.latlon.lat, lon: e.latlon.lon}}, success: function(response) { } }); }; map.on('click', onMapClick); I hate not being able to make new line here :/ Sorry. I'm trying this, but can't get it work at all.