How to Use Ajax Send Data to Controller in Ruby on Rails

Rails trouble sending AJAX data to controller

$.ajax({
  url : "/messages", //by rails convention doing a post simply to '/messages' should be handled by create action
  method : "post",
  data : { data_value: x },
  dataType : "json", //this might be wrong?
  success: function(response){
    //do something,maybe notify user successfully posted their message
  },
  error: function(error){
    console.log(error);
  }
});

And in your create method you should handle json requests

def create
  //save message
  @message.save!
  respond_to do |format|
    format.json { json: @message.as_json }
  end
end

This is how your code should look like. You can always do more creatively.

Please checkout this gist

Using ajax to send data to ruby controller

You need to do somthing like this:

Whatever is after the 'render json:' will be returned to the ajax call as the result. In this case, if the user saves it returns the words "it works":

def add_song()
 if user_signed_in?
   session[:user_id] = current_user.id
   present_user = User.find(session[:user_id])
   present_user.playlist.store(params[:data_value], 1)
   if present_user.save
     render json: { success: "It works" }
   end
 end
end

Now on the Ajax call we need to define the callback to handle the response in case of success. You also need to add a class in your view (in this example the id of this class is 'result') and in that element you will render the response you want to show:
...

else if(this.id == 'add_song') {
 $.ajax({
   url: "adding",
   type: "post",
   data: {data_value: JSON.stringify(player.src)},
   success: function(response) {
      $('#result').html(response.success);
   }
 });
}

Rails Send with AJAX parameters to custom action in controller from the view

Based on the output of your rake routes command, the route you're making a request to is scoped within the admin scope, so you should accordingly change your JS to:

  if ((subject != null && subject != "") && (message != null && message != "") && (representing_id_1 != null && representing_id_1 != ""))
    {
        url = "<%= admin_send_email_representing_path %>"; //<-- add admin scope here
        $.ajax({

Passing variable to controller through Ajax call

How about

#_index.html
javascript:
  $('#AuthorsIndex').DataTable({
    ajax: '/authors?author=<%= author %>',
    columns: [
      {title: 'Publish Date', data: 'created_at'},
      {title: 'Publisher', data: 'publisher'},
      {title: 'Title', data: 'title'},
    ]
  });

#authors_controllers.rb
def index
  @authors = Author.where(author: params[:author])
  render json: { data: @authors }
end

Use Ajax to request for rails controller data

If everything was working you would do:

success : function(response) {
  mysongs = response;
}

The 'response' parameter on the success function is the result of the ajax call you are sending from your controller; the @songs json.

A simple way to debug your javascript (to check what is the value of your 'response' after the ajax request) is to right-click on your browser and click on 'inspect', then go to the 'Sources' tab, look for your javascript file and click the line where you want to add the debug point (in this case the line with 'mysongs = response', then refresh the page. It should stop running at that point and show the value of 'response'.

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