Ruby on Rails：从JavaScript文件中的控制器获取json

Question

in my controller I've some json:

votes_controller.rb:

def create
  ...
  vote_status = current_user.user_votes.pluck(:recipient_uid).include?(@user.uid)
  render json: vote_status
end

I need to get vote_status in javascript file

votes.js:

jQuery(function($) {
  $(".doWant").click( function () {
    var status = vote_status.evalJSON();
    var uid = $(this).parents("#dialog")[0];
    var username = $(this).parents("#dialog")[0];
    if(confirm("Are you sure?")) {
      $.ajax({
        url: '/votes' + "?uid=" + $(uid).attr("data-user-uid") + "&username=" + $(username).attr("data-user-username"),
        type: 'POST',
        success: function(data) {
          console.log(data)
        }
      });
    };
  });
});

But there is an error Uncaught ReferenceError: vote_status is not defined . What am I doing wrong?

Thanks!

Answer 1

You're not defining this variable:

var status = vote_status.evalJSON();

You must define that variable.

It seems likely that you intended for that code to go into the success function, which returns the data from the ajax call as the first argument in that function:

success: function(data) {
  console.log(data)
}

Answer 2

The vote_status is returned in success json callback, init the status there

$.ajax({
    url: '/votes' + "?uid=" + $(uid).attr("data-user-uid") + "&username=" + $(username).attr("data-user-username"),
    type: 'POST',
    success: function(data) {
      var status = JSON.parse(data);
    }
  });