Rails控制器未收到Ajax呼叫

Question

my Ajax call via jQuery will always be transmitted (status 200), but only sometimes it's received by the rails controller. Means the data is sent properly but most times the controller sends back an empty json object as the response. I need the timeout else the stringify doesn't work. Any hints?

setTimeout(function() {
      $.ajax({
        type: "POST",
        url: "homepage/routes",
        data: {
          routes_my: JSON.stringify(routes)
        },
        success: function(data) {
          console.log(data);
        }
      });
    }, 100);
  }

#Controller
      def routes
        @routes = JSON.parse(params\[:routes_my\], object_class: OpenStruct)
        render :json => @routes
      end

console log working example

console log bad example

Answer 1

Try this function.

$(document).ready(function(){
    var obj = JSON.stringify(routes);
    $.ajax({
            type: "POST",
            url: "homepage/routes",
            data: {routes_my: obj},
            success: function(data) {
              console.log(data);
            }
          });
});

Answer 2

Actually the problem was that "routes" is the result of an async function and was sometimes only partially available. Fixed that by calling the Ajax as a callback function. setTimeout is then irrelevant.