After the form is submitted, attach a div containing the saved record

Question

After the form is submitted, attach a div containing the saved record

Once the form is submitted, I'd like to seamlessly add the newly saved record to my existing div that holds all the records. If there's a better method for accomplishing this, please let me know.

I'm unsure of the correct approach to achieve this, so the code in my create.js.erb file is purely speculative at this point.

The Form

<%= form_for @comment, remote: "true" do |f| %>
  <%= f.hidden_field :chat_id, value: @chat.id %>
  <%= f.text_area :content %>
  <%= f.submit "Send" %>
<% end %>

The Controller

def create
  @comment = Comment.new(creation_params)
  @comment.user_id = current_user.id

  if @comment.save
    respond_to do |format|
     format.js
     format.html
    end
  else
    redirect_to root_path
  end
end

The create.js.erb File

$("#comments").append("<%= @chat.comments.last %>");
$('#comment_content').val('').focus();

The Comments Section

<ul id="comments">
<% @chat.comments.each do |comment| %>
  <li id="comment-<%= comment.id %>">
    <%= comment.user.name %>
    <%= comment.content %>
  </li>
<% end %>
</ul>

javascript ruby-on-rails ajax ruby-on-rails-4

Answer 1

Answer №1

Upon initial review, I see a couple of areas that could benefit from some adjustments. While I am relatively new to this myself, I have had experience using Ajax with Rails in the past. Hopefully, my suggestions will be of assistance.

Form

Suggest replacing the string "true" with the boolean true within remote: "true".

<%= form_for @comment, remote: true do |f| %>
  <%= f.hidden_field :chat_id, value: @chat.id %>
  <%= f.text_area :content %>
  <%= f.submit "Send" %>
<% end %>

Controller

It is recommended to add

{render layout: false, content_type: 'text/javascript'}

after format.js. Additionally, ensure you define @chat in your create action if it's used in create.js.erb.

def create
  @comment = Comment.new(creation_params)
  @comment.user_id = current_user.id
  @chat = # however you can define your @chat variable, if you decide you need it

  if @comment.save
    respond_to do |format|
      format.js {render layout: false, content_type: 'text/javascript'}
      format.html
    end
  else
    redirect_to root_path
  end
end

create.js.erb

To maintain consistency, consider utilizing tags for formatting new comments with HTML like previous ones. Avoid appending the entire Ruby object by using @comment instead of @chat.comments.last. This way, only the comment's content and creator's name are appended, ensuring a smooth functioning JS file.

var markup = '<li id="comment-<%= @comment.id %>"><%= @comment.user.name %><%= @comment.content %></li>';
$("#comments").append(markup);
$('#comment_content').val('').focus();

Comments div

This section seems satisfactory as it stands.

<ul id="comments">
  <% @chat.comments.each do |comment| %>
    <li id="comment-<%= comment.id %>">
      <%= comment.user.name %>
      <%= comment.content %>
    </li>
  <% end %>
</ul>

Answer 2

Upon initial review, I see a couple of areas that could benefit from some adjustments. While I am relatively new to this myself, I have had experience using Ajax with Rails in the past. Hopefully, my suggestions will be of assistance.

Form

Suggest replacing the string "true" with the boolean true within remote: "true".

<%= form_for @comment, remote: true do |f| %>
  <%= f.hidden_field :chat_id, value: @chat.id %>
  <%= f.text_area :content %>
  <%= f.submit "Send" %>
<% end %>

Controller

It is recommended to add

{render layout: false, content_type: 'text/javascript'}

after format.js. Additionally, ensure you define @chat in your create action if it's used in create.js.erb.

def create
  @comment = Comment.new(creation_params)
  @comment.user_id = current_user.id
  @chat = # however you can define your @chat variable, if you decide you need it

  if @comment.save
    respond_to do |format|
      format.js {render layout: false, content_type: 'text/javascript'}
      format.html
    end
  else
    redirect_to root_path
  end
end

create.js.erb

To maintain consistency, consider utilizing tags for formatting new comments with HTML like previous ones. Avoid appending the entire Ruby object by using @comment instead of @chat.comments.last. This way, only the comment's content and creator's name are appended, ensuring a smooth functioning JS file.

var markup = '<li id="comment-<%= @comment.id %>"><%= @comment.user.name %><%= @comment.content %></li>';
$("#comments").append(markup);
$('#comment_content').val('').focus();

Comments div

This section seems satisfactory as it stands.

<ul id="comments">
  <% @chat.comments.each do |comment| %>
    <li id="comment-<%= comment.id %>">
      <%= comment.user.name %>
      <%= comment.content %>
    </li>
  <% end %>
</ul>

Answer 3

Answer №2

Your initial attempt seems to be on the right track overall. Personally, when tackling this issue (which I frequently do as I use ajax heavily in Rails), I prefer to address and troubleshoot each issue separately whenever possible. Here's how I usually tackle it:

First, I check if the controller action is being called and running correctly by sprinkling some puts statements in the code and monitoring the console output for verification.
Next, I ensure that the controller is rendering what I expect by using Chrome's developer tools and checking the Network tab to view AJAX request details, response codes, and load times, allowing me to inspect the JavaScript sent back to the browser thoroughly.
Finally, I confirm that the JavaScript is executing as intended by adding an alert("Done!"); at the end of the create.js.erb snippet.

Looking at your specific code, I'm curious about the string being appended to #comments. The jQuery command is:

$("#comments").append("<%= @chat.comments.last %>");

However, I believe you might need to append content with full HTML markup instead of plain text. It may look more like this for better readability (broken into 2 steps):

var markup = '<li><%= @chat.comments.last %></li>';
$('#comments').append(markup);

Furthermore, my personal approach to AJAX in Rails involves mostly disregarding Rails' built-in AJAX features and UJS. Instead, I opt to write custom jQuery code (precompiled within the asset pipeline) to handle click events, send AJAX requests, provide feedback on changes, and manage other functionalities. This keeps all my JavaScript neatly organized in /app/assets, rather than scattered throughout the view folders. Additionally, my controllers typically return JSON or sometimes a rendered HTML partial instead of injecting additional JavaScript snippets after page load. This method feels cleaner and gives me greater control over the page behavior.

Of course, one drawback is that I sacrifice Rails' UJS support with this approach; any functionalities implemented this way will not gracefully degrade if the browser lacks JavaScript support.

Answer 4

Your initial attempt seems to be on the right track overall. Personally, when tackling this issue (which I frequently do as I use ajax heavily in Rails), I prefer to address and troubleshoot each issue separately whenever possible. Here's how I usually tackle it:

First, I check if the controller action is being called and running correctly by sprinkling some puts statements in the code and monitoring the console output for verification.
Next, I ensure that the controller is rendering what I expect by using Chrome's developer tools and checking the Network tab to view AJAX request details, response codes, and load times, allowing me to inspect the JavaScript sent back to the browser thoroughly.
Finally, I confirm that the JavaScript is executing as intended by adding an alert("Done!"); at the end of the create.js.erb snippet.

Looking at your specific code, I'm curious about the string being appended to #comments. The jQuery command is:

$("#comments").append("<%= @chat.comments.last %>");

However, I believe you might need to append content with full HTML markup instead of plain text. It may look more like this for better readability (broken into 2 steps):

var markup = '<li><%= @chat.comments.last %></li>';
$('#comments').append(markup);

Furthermore, my personal approach to AJAX in Rails involves mostly disregarding Rails' built-in AJAX features and UJS. Instead, I opt to write custom jQuery code (precompiled within the asset pipeline) to handle click events, send AJAX requests, provide feedback on changes, and manage other functionalities. This keeps all my JavaScript neatly organized in /app/assets, rather than scattered throughout the view folders. Additionally, my controllers typically return JSON or sometimes a rendered HTML partial instead of injecting additional JavaScript snippets after page load. This method feels cleaner and gives me greater control over the page behavior.

Of course, one drawback is that I sacrifice Rails' UJS support with this approach; any functionalities implemented this way will not gracefully degrade if the browser lacks JavaScript support.

After the form is submitted, attach a div containing the saved record

Answer №1

Answer №2

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