Question

I’m trying to submit a form via ajax and include some variables that i’m setting via jquery.

/views/applications/_form.html.erb

<%= form_for(@application, :html => {:class => "organizer"}, :remote => true) do |f| %>
  // fields in here
<% end %>

/controllers/applications_controller.rb

  # PUT /applications/1
  # PUT /applications/1.json
  def update
    @application = Application.find(params[:id])
    p params[:xposition]     # these get set in jquery
    p params[:application]   # these get set in jquery
    respond_to do |format|
      if @application.update_attributes(params[:application])
        @curr_app = ApplicationField.last

        format.html { redirect_to @application, notice: 'Application was successfully updated.' }
        format.json { head :no_content }
        format.js { render action: "update" }
      else
        format.html { render action: "edit" }
        format.json { render json: @application.errors, status: :unprocessable_entity }
        format.js { render action: "update" }
      end
    end
  end

/assets/javascripts/applications.js

$('.organizer').submit(function() {

        var dataToSubmit = $(this).serialize();
        var field_values = [];
        var x_values = [];
        var y_values = [];

        // i add values to the arrays above here

        for(i = 0; i < field_values.length; ++i) {
            dataToSubmit += "&field_name="+field_values[i]+"&xposition="+x_values[i]+"&yposition="+y_values[i];
        }

        $.post($(this).attr('action'), dataToSubmit);   
    });

With my current code, when the form is submitted, it goes directly to the controller, and then the $.post call in my jquery code calls the same controller and passes xpostion and yposition in the data of the $.post call (which is what i want).

How can i make it so only my form doesn’t get submitted twice – once by hitting the controller as soon as the submit button is clicked and once from my $.post call?

I thought :remote => true makes it so the form wouldn’t call the controller directly?

EDIT

If :remote => true sends an ajax request without me having to use jquery’s $.post method to send the ajax request manually, how can i send extra variables along with the ajax request that automatically gets made by using :remote => true?

EDIT

Here’s a snippet from my server log

Started PUT "/applications/3" for 127.0.0.1 at 2013-01-18 00:06:19 -0600
Processing by ApplicationsController#update as */*
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"3LOzuiL/PU6HypJ4OeN5H9yrX3Xyk0VT6XpcFYd1wY0=", "application"=>{"application_field_attributes"=>{"0"=>{"id"=>"8"}, "1"=>{"id"=>"9"}}}, "field_name"=>"aaa", "xposition"=>"0", "yposition"=>"0", "id"=>"3"}
  Account Load (0.3ms)  SELECT `accounts`.* FROM `accounts` WHERE `accounts`.`subdomain` = 'localhost' LIMIT 1
  User Load (0.4ms)  SELECT `users`.* FROM `users` WHERE `users`.`id` = 1 LIMIT 1
  Application Load (0.4ms)  SELECT `applications`.* FROM `applications` WHERE `applications`.`id` = 3 LIMIT 1


Started PUT "/applications/3" for 127.0.0.1 at 2013-01-18 00:06:19 -0600
Processing by ApplicationsController#update as JS
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"3LOzuiL/PU6HypJ4OeN5H9yrX3Xyk0VT6XpcFYd1wY0=", "application"=>{"application_field_attributes"=>{"0"=>{"id"=>"8"}, "1"=>{"id"=>"9"}}}, "commit"=>"Submit", "id"=>"3"}
  Account Load (0.3ms)  SELECT `accounts`.* FROM `accounts` WHERE `accounts`.`subdomain` = 'localhost' LIMIT 1
  User Load (0.3ms)  SELECT `users`.* FROM `users` WHERE `users`.`id` = 1 LIMIT 1
  Application Load (0.4ms)  SELECT `applications`.* FROM `applications` WHERE `applications`.`id` = 3 LIMIT 1

Answer 1

You can try to stop all handlers except yours. Try this:

$('.organizer').submit(function(e) {
  e.preventDefault(); // stops default behavior
  e.stopPropagation(); // prevents event bubbling
  // you code
  return false;
});