RoR: Link_to_remote - updating text field - ruby-on-rails

I'm trying to use rails to change a textfield's value with a link_to_remote
<%= link_to_remote address.street, :url => {:controller => 'incidents', :action=>'street_selected', :update => "street.value" } %>
Street is the id of the textfield
my controller function renders text, but the textfield value isn't changed. How do i get this to work?

You could either remove and replace the text field or just update the value. Updating the value itself probably much simpler. The following assumes you haven't switched out Prototype for jQuery or another JS toolset.
In the view:
<%= link_to_remote address.street, :url => {:controller => 'incidents',
:action=>'street_selected'} %>
In the controller
def street_selected
...
code that gets new value
...
respond_to |format| do
format.js { render :update do |page|
page <<"$('textfield').value = new_value
end
}
end
P.S. You might want to pass some parameters in that remote link to allow for dynamic processing. Otherwise there's no point in doing this with AJAX.

Related

Reload page or div using RJS

I have a 'like'-counter in a rails project. Whenever one clicks this 'like'-link I want to add one to the like_counter in the database. The logic works well and the database is updated, but I cannot figure out how to set up the Ajax Request correctly so it refreshes the page or the div when completed.
In my view this looks as follows:
<%= link_to_remote 'like', :url => {
:controller => 'projects',
:action => 'like_it',
:id=> #project.id }%>
The controller:
def like_it
#project = Project.find(params[:id])
#project.update_like
render :update do |page|
page.reload
end
end
the update_like method is in the model and just adds one to the counter and saves the project (this part works).
As for the page.reload I Firefox throws an RJS-Error: ReferenceError: Reload is not defined. And the page is not reloaded
What do I do wrong? Is there a more distinguished way to just reload the div containing the counter? Any help is much appreciated!
Try:
render :update do |page|
page << "window.location.reload()"
end

link_to_remote wants to render a template - how not to? rails

I want to delete my task ajax-style if some conditions are met. I do that with the help of link_to_remote. The thing is that link_to_remote wants to render a template and i dont want it to.
In my view ( _task_sth.html.erb):
<%= link_to_remote "Delete task", :url => {:controller => 'tasks', :action => 'delete_task', :task_pers_id => sorted_user_task.id}, :complete => "$('#{delete_task_domid}').hide();" %>
In my controller (tasks_controller.rb):
def delete_task
task_pers = TaskPersonalization.find(params[:task_pers_id])
horse_task = task_pers.task
task_pers.destroy
if horse_task.task_personalizations.empty?
horse_task.destroy
end
end
The task gets deleted but i get an error saying: Missing template tasks/delete_task.erb in view path app/views.
How can i make it not search for a template?
I tried with adding :method => :delete at the end of link_to_remote and changing my action name to destroy. I also added render :nothing => true. I also played with routes a bit. But still i allways get the same error.
The question is how can i make it not search for a template because i dont want it to render anything?
Would be very gratefull for any answers, Roq.
Have you got the same error when adding render :nothing => true? That's strange.
Rails is trying to search for a template because there's no render in your action. So to avoid it, you need to explicitly call the method:
def delete_task
task_pers = TaskPersonalization.find(params[:task_pers_id])
horse_task = task_pers.task
task_pers.destroy
if horse_task.task_personalizations.empty?
horse_task.destroy
end
render :nothing => true, :status => 200
end

updating a rails partial with AJAX

I'm new to using AJAX in Rails (I know... I know...), and am positive that I'm doing something wrong that's probably just the wrong call or something. But I've hunted and can't seem to find it.
Anyway, I'm rendering out quick partial (this is working right) and then I want to refresh it with an AJAX call. Here's what I thought would work:
<div id="two_on_two"><%= render :partial => "quickread" %></div>
<p><%=link_to_remote "load two new stories", :url => {:partial => 'quickread'}, :update => 'two_on_two' %></p>
that just blows out the page (a quick flash and then just a blank browser window). If I switch from :partial to :action in that AJAX call, then it dynamically loads a "template missing" in that two_on_two div.
Clearly, there's something easy I'm missing here, right?
Thank you so much!
First, read api:
http://apidock.com/rails/ActionView/Helpers/PrototypeHelper/link_to_remote
You should specify your url correctly (controller, action, other params, not partial!) and define your RJS in controller action.
IE:
index.html.erb
<div id='two_on_two'></div>
link_to_remote 'Link Name', :url => {:controller => "bar", :action => "baz"}
bars_controller.rb
def baz
respond_to do |format|
format.js{ render :update do |page|
page.replace_html 'two_on_two', 'Hello world!'
end}
end
end
So when you will click Link Name, in your two_on_two div will appear "Hello world text".

How can i display an error for ajax in rails

I am trying to display an error message of flash in Ajax using Rails but it doesn't display it, and I have tried several ways to do it but I just can't get it right.
Here is my form to display my errors:
#flash-error.flash-error{:style => "display: none"}
#flash-notice.flash-info{:style => "display: none"}
%h3 New Document
- form_for(:repo_document, :url => {:all_categories => #repo_categories, :action => "create", :format => "js", :query => params[:query]}, :html => { :id => "repo_document_form", :multipart => true, :target => 'upload_frame'}) do |form|
Here is the controller:
if !params[:stands]
respond_to do |format|
format.js do
responds_to_parent do
render :update do |page|
page.show "flash-error"
page.replace_html "flash-error","Please select stands you want to grant permission to view this stand."
end
end
end
return
end
end
What am I doing wrong?
js.rjs to the rescue
def action
#true = params[:stands]
respond_to |format|
format.js
end
end
in action.js.rjs:
if #true
# do true stuff
else
page.replace_html 'error_block_dom_id', :text => 'This is my error'
end
and the original view file that you make the ajax call from:
#nothing here due to no errors - errors will appear if they happen
<div id="error_block_dom_id"></div>
No overarching reason to use the flash - just update a DOM object with the error content.
A possible solution would be to send an ajax call to an action in a controller and set your flash messages in that action
Flash is only going to display on the next time the page is loaded. It doesn't update through AJAX. One of the caveats of AJAX is that it doesn't deal with file uploads...
See this for more details; http://guides.rubyonrails.org/form_helpers.html#uploading-files
I think the problem might be elsewhere: Element's method show (call of which is generated when You call page.show "flash-error") will not remove display: none css style when it is given inside the external Css file. This is a quotation from older version of Prototype's API Documentation.
So try to add display: none as inline style of Your div's. I hope it will help!

Rails RESTful controller and rendering after custom action

How can I render after executing an action in a restful controller instead of redirecting.
I have a controller with standard actions, and I added a special action that adds data to the resource in question, via a form on the #show page (Think comments on a post). I am validating the input from the form and want to re-render the show action on error and redirect to the show action on success.
I want to render to save the user from inputting their info twice, but when I try to render the show action with an error in the flash[:notice] I get an error saying that I am not specifying an ID. When I do specify an ID, it tries to render a new template that doesn't exist yet.
I am thinking that it should be a as simple as:
def add_comment
if my_validation?
save the object
redirect_to :action => "show", :id => params[:id]
else
render :action => "show", :id => params[:id]
end
end
This is not my actual code, just something I put together just now as an example.
The best way is to re-render the :new
def create
#obj = TheObject.new(params[:object])
render :action => :new unless #obj.save
end
And in the new.html.erb
<% form_for :obj,
:url => object_url(#obj), :html => {:method => :post} do |f| %>
<%= f.text_field :name %>
<% end %>
That way, the inputs in the form will be pre-filled with what the user entered.
Create a new data object and add the values from the form, before you rerender, think it would work then. If you still get problems, try setting a boolean for editing new vs. existing rows, or create two different views entirely.
I've done it before but I don't quite remember how. Sometimes when I used the very typical use of the MVC pattern, it was allmost "automagical", othertimes (as I had to use an old quirky database) I had to code all the magic myself; sometimes usin the .new? function (or what it was called) on the ActiveRecord object, othertimes I used temporary "magic values" for ID (typically alphabetic strings for invalid id values.
(I appologize if I made some mistakes, it's a while since I coded Rails code...)

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