Accessing rails routes in javascript

问题:

Can anyone explain how i can access the rails routes/names routes in javascript ?

The following are some of the things i tried http://github.com/jsierles/js_named_routes.

but no luck.

回答1:

I was researching this question for a while and didn't found any implementation compatible with Rails 3.

So decided to write my own:

https://github.com/railsware/js-routes

回答2:

kishore I think this is the simpliest way, just call:

Rails.application.routes.url_helpers.*_path

So, if you have in your routes.rb, let's say:

resources :users

then you want to call the index action from a javascript file, you do:

$.get('<%= Rails.application.routes.url_helpers.users_path %>', function(data){ ...

Take into account that the js file should have a .erb extension (or *.js.erb) so rails knows that must be preprocessed. Otherwise, the file will be served as is.

回答3:

If I understand your requirement correctly you want Javascript code in your views to have access to the named routes. If so, then one simple way to do this is to render your Javascript code through a template (ERB, Haml, etc) and then to expand the routes something like the following:

ERB:

<script>

  $.get('<%= some_named_route_path %>', function(data) {

  });

</script>

Haml:

:javascript

  $.get('#{ some_named_route_path }', function(data) {

  });

UPDATE: Adding suggestions for public/javascripts/ case

Accessing named routes from the public folder is a bit trickier but there at least 2 ways that come to mind, neither of which is entirely satisfactory but, one or either of which might suit your application

1. Create javascript templates in (say) lib/javascripts using ERB named like '*.js.erb' and a rake task to expand those templates into public/javascripts before deploying (say as a step in your Capistrano recipe for example). Downside of that is that your changes are not made available live on the site until the templates are expanded and you might not get the right syntax highlighting of your javascript with an .erb extension file
2. Create per-view javascript helper functions in a content_for :head block which expand the named routes and make those available to code from your public javascript files. If you're careful with namespacing and conventions this might work out well. The downside is that the code calling these javascript helpers is decoupled from the code that defines them which could be confusing for maintainers or prone to abuse.

In some view:

<% content_for :head do %>
  <script>
    SomeNameSpace.helper_to_some_named_route = function() {
      return '%<= some_named_route_path %>
    };
  </script>
<% end %>

Then in public/application.js (say)

$.get(SomeNameSpace.helper_to_some_named_route(), function(data) {

});

回答4:

bjg really answered this, but I thought I'd extract the relevant part and amplify with an example.

You simply provide your view a string variable whose value is a named Rails path, and then use that value in the Javascript of your form. An example that illustrates how a controller method can specify the path for another method, to be opened by the script on the press of a button:

File config/routes.rb:

...
resource :foo, :only => [:show, :reset]
...
match 'foo_reset_path' => 'foo#reset'

Commanding rake routes will now produce, among other output, this:

foo             GET  /foo(.:format)            foo#show
foo_reset_path       /foo_reset_path(.:format) foo#reset

foo_reset_path is what we're going to use here, but you can of course use this method with any named Rails path.

File app/controllers/foo_controller.rb:

...
def show
  @reset_path = "foo_reset_path" # simply the string you'd use in the
                                 # Rails code for opening the path
  ...
end
...
def reset
  ... # reset some variables to their default values
  redirect_to foo_path # causes the show method to be called, and the HTML
                       # page to be redisplayed
end

File app/views/foo/show.html.erb:

...
<input type="hidden" id="reset_path" name="reset_path" value="<%= @reset_path %>">
...
<script>
$(document).ready(function() {
    ...
    /* Hang functionality on the "Reset form" button. */
    $('#reset_button').click(function () {
        var reset_path = $('#reset_path').val();
        window.open(reset_path, "_self")
    });
    ...
})
</script>

I'm using JQuery here, but the basic idea should be clear. The script adds a hook to the button element whose id is reset_button, so that clicking on the button causes the reset method of foo_controller to be called.

回答5:

What I did based on Teemu's great answer:

In your controller:

def show
  @section = Section.find(params[:id])
  respond_to do |format|
    format.html
    format.json { render json: @section}
  end
end

In your view:

 <input type="hidden" id="section_path" data-path="<%= @section.id %>" name="section_path" value="foo">

In your js:

var id = $('#section_path').attr('data-path');

$.ajax({
    url:'/sections/'+ id +'.json',
    type:"GET",
    success: function (data){
        console.info(data);
    },
    error: function (xhr, status){
        console.info(xhr.error);
    }
});

回答6:

See http://tore.darell.no/pages/javascript_routes:

JavascriptRoutes converts your Rails routes into JavaScript. You can then access (generate) them in the browser (or any other JS environment). It supports both normal and named routes, and creates helper functions for the latter.

Update: It looks as though someone has forked this if you prefer jQuery: https://github.com/ajnsit/javascript_routes

回答7:

1. gem install the "angular_rails_templates"
2. Create a file called angular_rails_templates.rb in the config/initializers folder
3. copy following code in the file and restart server. (including "module CustomERBEngine" for it cannot be added to code block by 4 space)

module CustomERBEngine

class ERBTemplate < Tilt::ERBTemplate

def evaluate(scope, locals, &block)
  scope.class_eval do
    include Rails.application.routes.url_helpers
    include Rails.application.routes.mounted_helpers
    include ActionView::Helpers
   end
      super
    end
  end
end

Tilt.register CustomERBEngine::ERBTemplate, '.erb'