application.js

$(document).ready(function () {

    // PSEUDO-CODE:
    //   1- intercept the form submission event using jQuery
    //   2- prevent the default action for that event from happening
    //   3- generate a random number between 1 and 6 using JavaScript
    //   4- use jQuery to submit an AJAX post to the form's action
    //   5- when the AJAX post is done, replace the contents of the "#die" DIV in the DOM using jQuery
  $('form').on('submit', function(e) {
    e.preventDefault();
    $.ajax ({
      type: "post",
      url: '/rolls'
    }).success(function(data){
      var $img = $('<img>')
      $img.attr('src',data+'.png');
      $('#die').html($img);
    });
  });
});



  

index.erb

<div class="container">
  <h1>Simplest Possible AJAX</h1>
  <p>This contrived app will simulate a roll of a 6-sided die.</p>

  <form method="post" action="/rolls">
    <input type="submit" value="Roll the Die">
  </form>

  <div id="die">
  </div>

</div>

index.rb

 get '/' do
  erb :index
end


# TODO: convert this route to use AJAX
post '/rolls' do
  # If the user passes-in a "value", let's use it. Otherwise, we'll generate a random one.
  # See: roll_if_value_is_nil method in the Roll model.

  value = params[:value] ? params[:value].to_i : nil

  @roll = value ? Roll.create({ value: value }) : Roll.create

  # erb :index  # HINT: what does this do? what should we do instead?
  @roll.value.to_s
end

lucky_ajax.md

Instructions:

1. Download this application skeleton.
2. Convert the app to use AJAX.
3. Add any files you changed to your gist and submit your code.