如何更新我的div部分？

Question

my forms goes like this

index.html.erb

<div id="comments_p">
  <%= render (:partial => "comment", :collection => tasks.comments) %>
</div>   
<% form_for :comment, :url => comment_task_path(tasks.id), :html => {:remote => true, :class => "comment_form"} do |f| -%>
  <%= f.text_field :remark, :placeholder => "Add Comments", :rows => 2, 
    :style => "width: 834px; height: 40px;"%>
  <%= f.submit "submit"%>
<% end -%>

<script type="text/javascript">
  jQuery.fn.submitWithAjax = function() {
    this.submit(function() {
      var test = $.post(this.action, $(this).serialize(), null, "script");
      $(".comment_form")[0].reset();
      alert("Comment Submitted");
      return false
    })
    return this;
  };
</script>

application.js

jQuery.ajaxSetup({ 
  'beforeSend': function(xhr) {xhr.setRequestHeader("Accept", "text/javascript")}
})

$(document).ready(function() {
  $(".comment_form").submitWithAjax();
})

my problem is that how can i update my div. the alert works but i cannot seem to find how to update the div comments_p

Answer 1

Hope the form is submitting to create method of Tasks controller . As the request is an js request in the back-end, so just create a file called create.js.erb in /app/views/tasks/ folder as explained in the Unobtrusive Javascript Railscasts and write the code what ever you want to execute after the sucessful response.

Get the updated tasks variable in tasks_controller.rb

def create
    #...code for creating the comments for the task
    @tasks = ... #updated record with the latest comments
end

then the response code in the create.js.erb file shoild be like

$("#comments_p").html('<%= render_partial :comment, :collection => @tasks.comments) %>');

the comments_p div will be updated after the successful completion of the request by the above code.