I'm doing some controllers to render reports and here is my problem:
The user open a page with a form which let it change the download format and the date of the report.
The download format is set trough a select input.
When the user press the button I want to response depending on the selected format.
The problem is that it's specified trough the url. So trying to do something like:
case format
when "xlsx" then format.xlsx{...}
when "html" then format.html{...}
...
end
doesn't work because rails or the browser (I'm not sure) expects an html response.
I've though of two options:
Change the url of the form onsubmit which makes the application more dependent on javascript. Or.
redirect_to url + ".#{params[:download_format]}"
The second way looks better to me but I need to pass the :report_date in the url and I can't find the way to do it.
I've tried this:
url = my_custom_url_path
redirect_to url + ".#{params[:download_format]}", :date_format => params[:date_format]
But it's not working.
In the form:
<%= f.select :download_format, { "xlsx" => "xlsx, "Online" => "html" } %>
In the controller:
def action
if download_format = params[:download_format].delete
redirect_to my_action_path(options.merge( :format => download_format ) ) and return
end
# do some logic here
respond_to do |format|
format.xlsx{...}
format.html{...}
end
end
Related
I'm using axlsx (with axlsx_rails for templating).
I have this in my controller:
def listado_publicaciones
if params[:publicaciones]
#Publicaciones = params[:publicaciones]
else
#Publicaciones = Proyecto.where("concurso_id","=",#concurso.id).as_json({:include => [:creador => {:only =>[:id],:include =>[:ficha =>{:only =>[:nombres,:apellidos], :methods => [:fullname],:include => [:publicacions => {:only =>[:id,:omitir,:anio,:titulo,:revista_nombre,:primer_autor,:autor_correspondiente,:coautor,:estado_id],:include => [:subtipo]}]}]}]})
end
respond_to do |format|
format.html
format.json { render :json => #Publicaciones}
format.xlsx
end
end
(I will use JBuilder later to avoid the long #Publicaciones...)
Well, "listado_publicaciones" first shows an html view, where using angular, gets a json list of publications, and there is where the user can discard some items before generating the excel..
The user then clicks a button "To Excel" that calls an angularjs service:
#project.service 'concursos_xlsx', [
'$resource'
($resource) ->
$resource '/concursos/:id/:action.xlsx', { id: '#id' },
listado_publicaciones:
method: 'POST'
params: action: 'listado_publicaciones'
]
I use POST, because I send back a $scope with the publications I first got on a Json, this is a very large list of publications and some other data, so if I try to use GET won't work because of the long url...
Then, the same controller, "listado_publicaciones" gets the parameter publicaciones (params[:publicaciones]) and responds to format xlsx...
Then, my template called "listado_publicaciones.xlsx.axlsx" generates the excel file.... BUT I don't know how to download it...
If I check the chrome developers tool, I can see this:
XHR finished loading: POST "http://localhost:3000/concursos/1/listado_publicaciones.xlsx".
And if I double click there, I can actually download the xlsx file... but I just don't know how to get the file downloaded when clicking the "To Excel" button...
I've tried using "send_data", "send_file", but maybe I'm using them the wrong way...
Please help, thanks!
I have files in server for whom i want to keep the url confidential. For this, i created a controller that fetch the data and ultimately render it to the web broswer.
In the view
<%= link_to "Click to view the file", file_proxy( user.pdf_file_url ) %>
In users_heper.rb
def file_proxy(url)
file_proxy_path(url: url)
end
In the routes.rb
get "file_proxy" => "file_proxy#fetch"
In the controller
def FileProxy < ApplicationController
def fetch
response = HTTParty.get params[:url]
render response
end
end
I'm getting an <HTTParty::Response:0x10cd6e6a8 parsed_response="%PDF-1.3......" is not an ActiveModel-compatible object. It must implement :to_partial_path.
Do you know how to tweak this code so that it can display the PDF file correctly ?
Thanks!
You can't call render that way. It's expecting very specific options. In this case it probably looks like:
pdf_content = HTTParty.get(params[:url])
send_data(pdf_content, disposition: 'inline', type: 'application/pdf')
As a note, you probably want to limit what sorts of things that tool fetches or someone will eventually abuse it.
I'm trying to use send_data to return a PNG image as the response for a ajax post request. How do I get the browser to trigger a download on the success callback?
Details
I'm generating a large base64 image using canvas.toDataURL(), and then posting it to Rails (v3.2.6). Rails decodes it to a binary PNG, and sends the image back to the client.
I've also tried send_file but it has the same issue.
Other options
Download image client side: We can't do this because (1) Safari crashes on large base64 URLs, and (2) Safari does not yet support the download attribute on anchor tags which I would need to specify the downloaded image filename.
Use a $.get instead of $.post: We can't do this because we need to send our canvas.toDataURL() with the request to the server. GET requests URIs have size limitations.
create a function in controller
def ajax_download
send_file "path_to_file/" + params[:file]
end
and then in controller action
respond_to do |format|
#java_url = "/home/ajax_download?file=#{file_name}"
format.js {render :partial => "downloadFile"}
end
and make a partial in view folder name with _downloadFile.js.erb and write this line
window.location.href = "<%=#java_url %>"
You can't download a file to disk from JS. It's a security concern. See the blog post below for a good workaround.
http://johnculviner.com/post/2012/03/22/Ajax-like-feature-rich-file-downloads-with-jQuery-File-Download.aspx
Do not just copy and paste the accepted answer. It is a massive security risk that cannot be understated. Although the technique is clever, delivering a file based on a parameter anybody can enter allows access to any file anybody can imagine is lying around.
Here's an example of a more secure way to use the same technique. It assumes there is a user logged in who has an API token, but you should be able to adapt it to your own scenario.
In the action:
current_user.pending_download = file_name
current_user.save!
respond_to do |format|
#java_url = "/ajax_download?token=#{current_user.api_token}"
format.js {render :partial => "downloadFile"}
end
Create a function in the controller
def ajax_download
if params[:token] == current_user.api_token
send_file "path_to_file/" + current_user.pending_download
current_user.pending_download = ''
current_user.save!
else
redirect_to root_path, notice: "Unauthorized"
end
end
Make a partial in view folder name with _downloadFile.js.erb
window.location.href = "<%=#java_url %>"
And of course you will need a route that points to /ajax_download in routes.rb
get 'ajax_download', to: 'controller#ajax_download'
Here's what I'm trying to do.
when the user clicks new note.. I want the user to be taken to a page when they can start typing a note, and save it to the server all with AJAX..
Problem is, every time the page saves, it's making a new note.
This leads me to believe that when Rails gets the DEF NEW controller, some how I need rails to first make a NEW NOTE record and then redirect to the edit controller of that new note, where the user can create/edit the note all with AJAX.
Thoughts? Thanks.
I had the same problem once, creating the note first is probably a good idea.
Another way would be to send the user to the new action. When the first save occurs you send the new object back as a JSON object, and replace the form's action with the update url for that record as well as setting the form's method to put.
This way you don't end up with empty records in the database (with your use-case, you might want exactly that, so a User can continue a note later.)
Just my two cents.
Ok a way of implementing this could look like this:
Form
<%= form_for resource,
:remote => true,
:html => { 'id' => 'autosave' },
:url => resources_path(:format => :json) do |f| %>
...
<% end %>
Application JS
var $form = $('#autosave');
// bind to the first success event from the form
$form.one('ajax:success', function(data, status, xhr) {
// data contains our json object (your note as json)
// now we update the form
$form.attr('action', '/notes/' + data.id);
$form.attr('method', 'put');
$form.attr('data-method', 'put');
});
Controller
class ExampleController
...
def create
#
# respond with the json object if format = json,
# see the form above I'm passing the format with :url parameter in form_for
#
respond_with(resource) do |format|
format.json { render :json => resource }
end
end
end
If you really want use to use #new to create a note and save it, then you can simply do
def new
#note = Note.create # instead of Note.new
end
Rails will then display this note just like the #edit action, so the note id will be in a hidden field. Then when you send the Ajax calls, you'll be calling #edit. If you want to preserve the behavior of #new for when javascript is turned off, then you might want to create a different action.
def new
#note = Note.new
end
def new_js
#note = Note.create
end
When you load the page that has the link to new_note, include some javascript that changes the link to new_js_note. So when JS is off, you get the standard #new form. When JS is on, you get a form that is basically editing a preexisting blank note.
How to easily change the format of URL in a right way:
/comment/10.js?param1=6
to
/comment/10?param1=6
Preferrably with some URL library or so, not with regexps.
Use case: redirect back with request.request_uri saved in session.
I'm not quite sure the use case, but the simplest way would be in the controller
respond_to do |f|
f.js { redirect_to #copy url params, but set :format to what you actually want }
end