Develop Reference

How to avoid sending params of fields deleted using JQuery remove()

In this code I was trying to remove fileds for nested_attributes using ajax :remote => ture to avoid reloading
the whole page in browser. Although fileds in fields_for was removed from DOM and association was removed from database, the fields of the nested attributes
still exist in page source and raise ActiveRecord::RecordNotFound error when trying to send params to update action of parent model
consider the following code:
_artist_form.html.erb
<%= form_for #artist do |f| %>
<%= f.label :name %>
<%= f.text_field :name %><br/>
<%= f.label :style %>
<%= f.text_field :style %><br/>
<%= f.fields_for :songs do |song_builder|%>
<div id = 'song_<%= song_builder.object.id %>_div'>
<%= song_builder.label :title %>
<%= song_builder.text_field :title %><br/>
<%= song_builder.label :lyrics %>
<%= song_builder.text_area :lyrics %><br/>
<%= link_to 'Remove song', delete_song_path(:a_id => #artist.id, :s_id => song_builder.object.id),
:method => :delete , :remote => true %>
</div>
<% end %>
<%= f.submit 'Save' %>
<% end %>
routes.rb
Rails.application.routes.draw do
...
delete '/artists/remove_song', :to => 'artists#delete_song', :as => :delete_song
end
application_controller.rb
class ArtistsController < ApplicationController
def edit
...
end
def update
#artist = Artist.find(params[:id])
if #artist.update(artist_params) #=> error Couldn't find Song with ID=2 for Artist with ID=2
redirect_to artist_path(#artist)
else
flash[:errors] = #artist.errors.full_messages
render :edit
end
end
...
def delete_song
#song_id = params[s_id]
aritst = Artist.find(:params[a_id])
song = artist.songs.find(#song_id)
song.delete
respond_to do |format|
format.js {render 'delete_song.js.erb'}
end
end
end
delete_song.js.erb
$('#song_<%= #song_id %>_div').remove() ;
Error
Couldn't find Song with ID=2 for Artist with ID=2
how to prevent sending params of removed fields by $(...).remove() to update action?

I tried to find a solution for this error. So according to charlietfl comment, I tried to store delete status somewhere locally, then rails can delete association later. So I modified the code as following:
deleting all remote script code including delete_song.js.erb file and delete_song action and delete route. then I allowed marking nested attribute for delete in Artist model file:
accepts_nested_attributes_for :songs, :allow_destroy => true
then adding delete button in _artist_form.html.erb file as following:
<%= button_tag 'x' , :class => 'close_sign', :type => 'button', :onclick => "$('#song_#{song_builder.object.id}_destroy').val('true'); $('#song_#{song_builder.object.id}_div').hide()" %><br/>
and a hidden flied to fields_for as below:
<%= song_builder.hidden_field :_destroy, :id => "song_#{song_builder.object.id}_destroy" %>
and allowing :songs_nested_attributes => [:title, :lyrics, :_destroy] in song_params
once user remove the song field, it will be hidden and marked for destroy later

How to make a input field visible when a button is clicked or create the same field when a button is clicked for ruby on rails

rails newbie here.
this is my current form
<%= f.input :campaign_name , :input_html => {:style=> 'width: 300px'} %>
<%= f.input :date_range, :input_html => {:style=> 'width: 300px'}%>
<%= f.label :first_event %>
<%= f.collection_select :first_event, eventNames, :to_s, :to_s, include_blank: true %>
<br><br><br>
<%= f.label :second_event %>
<%= f.collection_select :second_event, eventNames, :to_s, :to_s, include_blank: true%>
what i want is this, when user clicks "add filter" i want another field to pop up with the same eventNames array as a collection select.I tried to create another button and get it's tag and if its not the submit button and its add filter button render another form.
but this is terribly bad as a interface and as a user experience.
i want my user to be able to remove the second event field at anytime, without having to submit the form.
So i need to add another button in it to remove the newly made visible form.
How can i achieve this

As i said in my comment if you have a restriction that a user could add only a single or lets say a fixed number of filters then you can simply show and hide your collection by js. Your form would have a hidden collection list
<%= f.input :campaign_name , :input_html => {:style=> 'width: 300px'} %>
<%= f.input :date_range, :input_html => {:style=> 'width: 300px'}%>
<%= f.label :first_event %>
<%= f.collection_select :first_event, eventNames, :to_s, :to_s, include_blank: true %>
<br><br><br>
<%= f.label :second_event %>
<%= f.collection_select :second_event, eventNames, :to_s, :to_s, include_blank: true%>
<%= f.label :third_event, class: "hidden" %>
<%= f.collection_select :third_event, eventNames, :to_s, :to_s, include_blank: true, class: "hidden"%>
hide your collection by css
.hidden{display: none;}
and show it by js when a user click on add filter, assuming it's a link you could do:
= link_to "Add Filter", "#", id: "add-filter"
$(document).on("click","#add-filter", function(e){
$(".hidden").show();
e.preventDefault();
});
If user can add multiple filters then you'll need to add them by ajax. For ajax follow these steps:
a. Create a custom route for your action:
post "/filter" => "your_controller#add_filter", as: "filter"
b. create your link for adding filter:
<%= link_to "Add Filter", filter_path, id: "add-filter", data: {event_id: "2", url: filter_path}%>
c. Get event_id by js and send a ajax request:
$(document).on("click","#add-filter".function(e){
var eventId = $(this).data("eventId");
var url = $(this).data("url");
$.ajax({
type: "POST",
url: url,
data: {id: eventId}
});
})
d. Create add_filter action in your controller:
def add_filter
#event_id = params[:id]
respond_to do |format|
format.js
end
end
e. Create your new collection and append it by js in app/views/your_controller/add_filter.js.erb file
var label = "<%=j label_tag "#{#event_id.humanize}_event" %>"
var collection = "<%=j collection_select(:resource, "#{#event_id.humanize}_event".to_sym , eventNames, :to_s, :to_s, include_blank: true) %>"
$("#form_id").find("select").last().after(label).after(collection);
$("#add-filter").data("eventId","<%=j #event_id + 1 %>");
You'll have to use humanize or number_and_words to convert your #event_id to words format and also you'll have to change :resource accordingly

Radio buttons not changing database in firefox but they do in chrome, why?

I have a remote form which contains 3 radio button tags, each will change the DB accordingly. This works perfectly fine in chrome but when I switch to FF the radio get checked and all but the DB does not change at all.
This is the form in my view.
<%= form_tag ("deal_status"), :remote => true, :class => "deals_status" do %>
<%= hidden_field_tag 'deal_id', d.id.to_s %>
<%= radio_button_tag( :state, "won"+d.id.to_s, d.state == "won", :class => "toggle-btn-left toggle-btn", :value =>"won") %>
<%= label_tag 'state_won'+d.id.to_s, "won", :class=>"btn" %>
<%= radio_button_tag :state, "lost"+d.id.to_s, d.state == 'lost', :class => "toggle-btn-center toggle-btn",:value => "lost" %>
<%= label_tag 'state_lost'+d.id.to_s, "lost",:class=>"btn" %>
<%= radio_button_tag :state, "pending"+d.id.to_s, d.state == 'pending',:class => "toggle-btn-right toggle-btn", :value => "pending" %>
<%= label_tag 'state_pending'+d.id.to_s, "pending",:class=>"btn" %>
<% end %>
this the js that does the submitting
$("body").on("change", "form :radio", function(){
$(this).closest("form").submit();
});
and this is the controller's action :
def deal_status
deal_id = params[:deal_id]
d = Deal.find_by_id(deal_id)
d.state = params[:state]
d.save
#deal_id = deal_id
#deal = d
respond_to do |format|
format.js
end
end

Rails 3.2 - Ajax call when text field changes

I have a Rails 3.2.13 app with some Ajax on forms and links, using the remote parameter.
The problem is that i can't find in the docs how to do the same with text fields - the
remote parameter didn't work, so i think it's not supported on input objects.
I'd like to do bind 'ajax:xxx' events (like 'ajax:success') on my text_field objects.
I this even possible with UJS? If not, what my options are?
Here's some code:
<%= form_for #post, :html => {:class => 'form-horizontal'} do |f| %>
<div class = 'control-group'>
<%= f.label :title, :html => {:class => 'control-label'} %>
<%= f.text_field :title, :placeholder => 'Title', :class => 'input-xxlarge' %>
</div>
<div class = 'control-group'>
<%= f.label :body, :html => {:class => 'control-label'} %>
<%= f.text_area :body, :placeholder => 'Your post here', :class => 'input-xxlarge',
:rows => 15 %>
</div>
<div class = 'control-group'>
<%= f.label :tags, :html => {:class => 'control-label'} %>
<%= f.text_field :tags, :placeholder => 'Tags separeted by ,', :class => 'input-xxlarge',
:value => '' %>
</div>
<%= f.submit 'Create', :class => 'btn btn-primary'%>
Thanks!

I would bind a change or blur event to the input, and then make the Ajax call manually on your javascript/coffecript file.
posts.js
$('#post_title').change(function() {
// Do your stuff, instantiate variables, etc...
$.ajax({
type: post_or_get,
url: your_url,
data: your_data,
success: function(data) {
// Handle stuff after hitting the server here
},
error: function(data) {
}
});
});

Add remote: => true on Form_for

In my _form.html.erb file, I have;
<%= form_for(#document) do |f| %>
<% end %>
When I add
<%= form_for(#document), :remote => true do |f| %>
<% end %>
I get an error. I want to add ajax to this form so the user can submit it, it'll appear with a notice saving "saved" and then the user can carry on writing in the textarea within the form.
The error says:
SyntaxError in Documents#edit
Showing /app/views/documents/_form.html.erb where line #1 raised:
<%= form_for(#document), :remote => true do |f| %>
It's saying that line 1 (above) is a syntax error.
How can I add remote true to the form_for so I can add Ajax?
Update
So out of the two answers, I have;
<%= form_for(#document, :remote => true) do |f| %>
and
<%= form_for #document, :remote => true do |f| %>
They both work but is one better than the other or do they end up doing the same thing?

You've inserted the :remote = true right AFTER the parameter list. Just leave off the parenthesis.
<%= form_for #document, :remote => true do |f| %>

<%= form_for(#document, :remote => true) do |f| %>
...
<% end %>
reefer this : http://apidock.com/rails/ActionView/Helpers/FormHelper/form_for

Also with namespace you can use
<%= form_for [:namespace, #document], html: { help: :block }, remote: true do |f| %>
...
<% end %>