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);
    };

TGH · Accepted Answer · 2014-11-21 04:44:08Z

1

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

answered Nov 21, 2014 at 4:44

TGH

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3 Comments

ivanacorovic Over a year ago

Could you show me an example? Do I need to make it return .json somewhere?

TGH Over a year ago

You could maybe find some help here stackoverflow.com/questions/7237720/jquery-post-to-rails

ivanacorovic Over a year ago

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.

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