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Rails submitting a form through ajax

There is some problem with using ajax in rails. I want to create new post in my wellcome/inex page. But when I push the botton it show
No route matches [POST] "/welcome/index"
wellcome/index.html
<b>Projects</b>
<ul id="projects">
<% #projects.each do |project| %>
<h2><%= project.title %></h2>
<% end %>
</ul>
<br>
<%= form_for :project do |f| %>
<%= f.text_field :title, :placeholder => ' Enter new project here..' %>
<but><%= f.submit 'Add Project'%></but>
<% end %>
welcome_controller.rb
class WelcomeController < ApplicationController
def index
#projects = Project.all
#project = Project.new
end
def create
#project = Project.new(project_params)
respond_to do |format|
if #project.save
format.html { redirect_to #project, notice: 'project was successfully created.' }
format.js
format.json { render json: #project, status: :created, location: #project }
else
format.html { render action: "new" }
format.json { render json: #project.errors, status: :unprocessable_entity }
end
end
end
private
def project_params
params.require(:project).permit(:title)
end
end
create.js.erb
$('#projects').html("<%= escape_javascript (render 'projects') %>");
routes project
Prefix Verb URI Pattern Controller#Action
project_index GET /project(.:format) project#index
POST /project(.:format) project#create
new_project GET /project/new(.:format) project#new
edit_project GET /project/:id/edit(.:format) project#edit
project GET /project/:id(.:format) project#show
PATCH /project/:id(.:format) project#update
PUT /project/:id(.:format) project#update
DELETE /project/:id(.:format) project#destroy
Spent a lot of time updating this with AJAX but failed everytime. Any there to help? Thanks in advance

You have to add remote: true into form.
<%= form_for #project, url: project_index_path, remote: true do |f| %>
<%= f.text_field :title, :placeholder => ' Enter new project here..' %>
<but><%= f.submit 'Add Project'%></but>
<% end %>

If you want integrate Ajax and Ruby you need to add the line below inside your link action
remote:true
also you can check this about Ajax and Ruby
How Ajax works with ruby on rails

How do I render a partial containing a form_for for an edit function?

I have a div in a parent view that renders a show partial. In this show partial, I have a button that should change the parent's partial to render the 'form' partial to edit the object, but I keep getting jammed up because it seems that the 'form' partial's form_for is missing the #project object.
How can I pass this object to the 'form' partial? Am I missing something else?
I am rather new to using AJAX. Happy to provide more information if you need.
The error I am getting in the server terminal is
ActionView::Template::Error (First argument in form cannot contain nil or be empty):
routes.rb
get 'switchProjectView', to: 'projects#switch_main_view'
resources :projects
projects_controller.rb
class ProjectsController < ApplicationController
def new
#project = Project.new
end
def create
#project = Project.new(project_params)
if #project.save
flash[:success] = "New Project Added"
redirect_to #project
else
flash[:danger] = "Project Not Added. Please Try Again"
end
end
def show
#project = Project.find(params[:id])
end
def index
#projects = Project.all
end
def update
#project = Project.find(params[:id])
if #project.update_attributes(project_params)
redirect_to #project
else
render 'edit'
end
end
def edit
end
def switch_main_view
respond_to do |format|
format.html
format.js
end
end
def project_params
params.require(:project).permit(:main_contact_name, :id, :main_contact_phone, :main_contact_email, :project_name)
end
end
show.html.erb
<div class="body">
<div class="center jumbotron heading-jumbo">
<h1><%= #project.project_name %></h1>
</div>
<div class="body-jumbo jumbotron" id='project-details'>
<%= render "projects/show" %>
</div>
</div>
switch_main_view.js.erb
$('#project-details').html("<%= j render :partial => 'projects/form' %>");
_form.html.erb
<%= form_for(#project) do |f| %>
<%= f.label :project_name %>
<%= f.text_field :project_name, class: 'form-control'%>
<%= f.label :main_contact_name %>
<%= f.text_field :main_contact_name, class: 'form-control'%>
<%= f.label :main_contact_phone %>
<%= f.text_field :main_contact_phone, class: 'form-control'%>
<%= f.label :main_contact_email %>
<%= f.text_field :main_contact_email, class: 'form-control'%>
<%= f.submit 'Save Project', class: 'btn btn-primary'%>
<% end %>
_show.html.erb
<div class='text-center center'>
<h3><strong>Project Information</strong></h2>
</div>
<h2>Start Date: Launch Date:</h1>
<span class='pull-right jumbo-btn-span'><%= link_to "Edit Project Information", switchProjectView_path(#project), remote: true, class:'btn btn-primary jumbo-btn' %></span>
<h2>Primary Conact's Name: <%= #project.main_contact_name %></h2>
<h2>Primary Conact's Phone: <%= #project.main_contact_phone %></h2>
<h2>Primary Conact's Email: <%= #project.main_contact_email %></h2>

Well, with each request, you need to re-initialize the variable in your controller method. In your case, you need to do the following:
def switch_main_view
#project = Project.new
respond_to do |format|
format.html
format.js
end
end
Doing so will enable you to get rid of the error: First argument in form cannot contain nil or be empty, but that won't enable you to do what you are actually trying to do.
When you use link_to, by default it goes for an HTML request as you can see in Rails logs, something like following will appear:
Processing by ProjectsController#switch_main_view as HTML
In order to get the JS response, you need to tell link_to that you are up for a JS response, not for an HTML response, and you can do by passing format: :js in link_to like:
<%= link_to "Edit Project Information", switchProjectView_path(#project, format: :js), remote: true, class:'btn btn-primary jumbo-btn' %></span>
remote: true will be there to make sure that you aren't reloading the contents of the page, rather you are trying to fetch something from the server in the background.

Your request "switchProjectView_path(#project)" only send object id to server, so you need to load the object to present it in view for response.
1. First the route should look like this so that, the url could contain object id:
get 'switchProjectView/:id', to: 'projects#switch_main_view', as:"switchProjectView"
2. You have to load the object in controller:
def switch_main_view
#project = Project.find(params[:id])
respond_to do |format|
format.html
format.js
end
end

Try passing the variable when calling the partial:
$('#project-details').html("<%= j render :partial => 'projects/form', locals: {project: #project} %>");

Render Form partial from Ajax in rails

I have a form as image below:
Then I want to render this partial from ajax call: from .js.erb. But I don't know how to pass object to f from partial. See the image below:
how can I pass object to f:

Adding :remote => true it makes the button asynchronously(Ajax call).
index.html.erb
<%= link_to "Add Journal", new_journal_path, remote: true, class: 'new_journal_button'%>
new.js.erb
$('.new_journal_button').after("<%= j render('form') %>");
$('.new_journal_button').hide();
If you want to submit a form asynchronously(Ajax call)
_form.html.erb
<%= form_for(#journal, remote: true) do |f| %>
<div class="field">
<%= f.label "journal" %><br>
<%= f.text_field :title, placeholder: 'Journal', autofocus: true, 'data-behavior' => 'submit_on_enter' %>
</div>
<% end %>
Journals_controller.rb
def index
#journal = Journal.new
#journals = Journal.all
end
def create
#journal = Journal.new(journal_params)
respond_to do |format|
if #journal.save
format.html { redirect_to #journal, notice: 'Journal was successfully created.' }
format.js
else
format.html { render :new }
end
end
end

I was pondering on how to replace part of the form (if that is what you are doing) for a while. The following is not perfect but "works for me".
We instantiate the form builder f in the controller (instead of a view) and render only your partial into a string. Then escape and render js into Ajax reply as usually.
def show
respond_to do |format|
format.js do
helpers.form_for(#journal) do |f|
out = render_to_string partial: 'journal_entry_transaction_fields', locals: {f: f}
render js: %($('.journal-entry').html("#{helpers.j out}");)
end
end
end
end
Perhaps the corresponding coffeescript part that is Turbolinks friendly and uses jQuery for sending Ajax is akin to
$(document).on 'change', '#something', (e) ->
$.get
url: "/path/to/your/controller/#{e.target.value}.js"

you could send #journal object then use fields_for #journal into partial
.js.erb
$('.journal-entry').html("<%= j render partial: 'journal_entry_transaction_fields', object: #journal %>");
Partial .html.erb
<%= fields_for #journal do |f| %>
... code .....
<% end %>

Ruby on rails AJAX submit form error

So I'm trying to update my comments section with AJAX without the full page refresh for a college project. However I can't seem to get this working.
In the console it gives me s
Failed to load resource: the server responded with a status of 500 (Internal Server Error)
My show.html.erb file:
<h1>Title: <%= #post.title %></h1>
<h2>Body: <%= #post.body %></h2>
<hr />
<h1>Your comments</h1>
<%= link_to "View comments", "#", id: "comments-link" %>
<ol id="comments">
<%= render 'comments' %>
<hr />
<h1>Create comment</h1>
<%= form_for(#comment, :html => {class: "form", role: "forms"}, :url => post_comments_path(#post), remote: true) do |comm| %>
<div class="container">
<div class="input-group input-group-md">
<%= comm.label :body %>
<%= comm.text_area :body, class: "form-control", placeholder: "Enter a comment" %>
</div>
<%= comm.submit "custom", id: "button" %>
</div>
<% end %>
</ol>
My comments.coffee:
$(document).on "page:change", ->
$('#comments-link').click ->
$('#comments').fadeToggle()
$('#comments_body').focus()
My create.js.erb:
$('#comments').append("<%= j render #comment %>");
and my Comments controller:
class CommentsController < ApplicationController
def index
end
def new
end
def new
#comment = Comment.new
end
def create
#comment = Comment.new(comment_params)
#comment.post_id = params[:post_id]
if #comment.save
flash[:success] = "Successfully created comment"
respond_to do |format|
format.html { redirect_to post_path(#comment.post_id) }
format.js
end
else
flash[:danger] = "Failed to create comment"
redirect_to root_path
end
end
private
def comment_params
params.require(:comment).permit(:body)
end
end
I may have missed some files so just let me know, it is basic as it's just a post and comment system - no styling needed for the project, so yeah. I have been trying this for the last 4 hours and other places just don't work. I've looked on here, Youtube - everywhere however no one else's code works for me so I have come here! Thank's for you're help.
EDIT:
I noticed it said to create a view in the error response, however I made that view and rendered the comment's body onto the create.html.erb however I just need to display the form now.

I notice you are posting to the url post_comments_path(#post). For nested routes, it might be cleaner to do the following:
1) Post to the nested route directly:
<%= form_for([#post, #comment], html: {class: "form", role: "forms"}, remote: true) do |comm| %>
2) Make sure your routes are nested properly, in routes.rb:
resources :posts do
resources :comments
end
3) Refactor your CommentsController, to build through the #post instance:
class CommentsController < ApplicationController
before_action :get_post
def index
#comments = #post.comments
end
def new
#comment = #post.comments.build
end
def create
#comment = #post.comments.build(comment_params)
if #comment.save
flash[:success] = "Successfully created comment"
respond_to do |format|
format.html { redirect_to post_path(#post) }
format.js
end
else
respond_to do |format|
format.html { render :new }
format.js { render :error }
end
end
end
private
def comment_params
params.require(:comment).permit(:body)
end
def get_post
#post = Post.find(params[:post_id])
end
end
4) Render the validation errors in app/views/comments/error.js.erb. I'll let you decide how best to do that, but here's a quick dump to the console:
<% #comment.errors.full_messages.each do |message| %>
console.log("<%= message %>");
<% end %>
This file is not to be confused with your app/views/comments/create.js.erb which is handling successful save of the comment. That should look something like this:
$('#comments').append("<%= j render #comment %>");
$(".form")[0].reset();
5) Tweak your view a little bit. I notice you need to output the comments differently:
<ol id="comments">
<%= render #post.comments %>
</ol>
which should correspond to a partial in app/views/comments/_comment.html.erb so make sure this is there.

Rails: What is wrong with this logic of trying to render a parial on click?

I'm trying to get the activities when the user clicks on a button called display
Controller:
def display
#activities = Activity.all
#activities = Activity.order("created_at desc")
#we will need to find the Post id Through Users relation to the Comments
#And this is because Activity Track, tracks Users actions, it breaks down from there.
#posts = Post.all
#user_comments = UserComment.all
respond_to do |format|
format.js { #activities = Activity.order("created_at desc") }
end
View:
<%= link_to "Display", activities_path, :remote => true %>
<div id="notify" class="section-link">
</div>
display.js.erb
$('#notify').append("<%= escape_javascript(render :partial => 'layouts/activity') %>");
_activity.html.erb
<% #activities.each do |activity| %>
<%= ActivityPresenter.new(activity, self).render_activity %>
<% end %>

Try this in display.js.erb:
$('#notify').append('<%= escape_javascript(render :partial => 'layouts/activity', :collection => #activities) %>');
Then, try this in _activity.html.erb:
<%= ActivityPresenter.new(activity, self).render_activity %>
To ensure that whenever the user clicks on "Display' the display action is invoked, you will need to adjust your routes.rb file, which is located in the config directory. You could do something like this in routes.rb:
get '/activities/display', 'activities#display', as: :activity_display
Once you make that change in routes.rb, you can edit your link_to like this:
<%= link_to "Display", activity_display_path, :remote => true %>