I'm seeing code like this inside of an erb template:
<% hook :admin_footer_scripts do -%>
What exactly is hook? is it a standard method within ActionView?
It's probably a helper method defined in your application. Look in app/helpers/application.rb or in the app/helpers/ directory for a ruby file named like the controller which renders that view
Just from what it looks like I'd say it's a way to allow the controller to add code the the page. But bgj is right. Look in your helper files.
Related
I've added a theming directory to my app as described here, using prepend_view_path. It works as expected. I can now add a view structure in my app under app/themes/my_theme/views
Now, I want to be able to override erb templates by dropping in a
.liquid file, which will render right off the controller action.
For example, I want to override app/views/pages/home.html.erb:
<h1><%= t 'it_works' %></h1>
...with app/themes/my_theme/views/pages/home.liquid
<h1>It works with {{ "liquid" }}</h1>
I don't want to have to specify an array of view paths (upkeep would be awful), but just add .liquid as a layer to the templating engine. Maybe, however, have a blacklist of protected views that cannot be overridden (such as app/views/admin/*)
Do you have a liquid template handler? Otherwise Rails won't know what you want to do with .liquid files. See this blog post: http://royvandermeij.com/blog/2011/09/21/create-a-liquid-handler-for-rails-3-dot-1/
For your second question: not using a theme for app/views/admin/* you should make sure you have an AdminController that does not prepend_view_path.
According to the documentation you can use prepend_view_path
Add the following to your ApplicationController:
before_filter :set_theme_path
def set_theme_path
prepend_view_path "app/themes/#{current_theme}"
end
So Rails should then look for any views in your theme specific directory in preference to the default views in app/views/**/*
Is it possible to call a ruby helper method from within a js.erb file?
I have a helper in application_helper.rb called solve which makes a API call to a third party service, and they only have a ruby client.
The js.erb file isn't being run on the client side, it is being called from within a controller method and run server side as it is PhantomJS.
I call the JS file from the controller
Phantomjs.run('phantom.js.erb', url)
Then within the PhantomJS js.erb file I have tried
var response = '<%= solve(variable) %>'
which just sets the variable as the string <%= solve(variable) %>
I have also tried
var response = <%= solve(variable) %>
but that just seems to make the application hang and become unresponsive.
I have seen other questions similar to this. In those questions they are asking if it is possible to call it from client side JS which I know you need to use an ajax request to do so.
Is this possible?
Try this:
var content = '#{solve()}'
Need a bit more context for this question, but I'll try my best to answer:
Essentially, you wouldn't be able to access your application_helper methods outside of any .erb files. (ie. if you have application.js or any other js file in your pipeline and you are trying to <%= solve %> from there it wouldn't work - mainly because it isn't an .erb file)
There are a lot of ways and architecture to go about solving this, but here are two simple ones:
If you put the JS you want to evaluate inline on the same page as your partial/html.erb page by using <script> //JS ERB CODE GOES HERE </script> It will actually evaluate properly since it is inside of an erb file. However, this is generally looked upon as unclean...
What you probably want to do is pass the value (presumably) you want that comes from the "solve" application_helper in a 'data' attribute on the html element that it affects. By utilizing "unobtrusive javascript" in this way, you simply pass the value through markup and then in your JS you can get the variable by using jQuery code like this. Here's an example:
<%= link_to "test_link", root_path, :data => {:solve => solve } %>
Of course it doesn't have to be a link, any HTML element will do, and then in your jQuery:
$("#test_link").data("solve");
will return to you whatever output comes out of your "solve" method in the application_helper.
it can possible but there are different ways to do it. one way is define the method in helper_method in your controller and call it from your view. and another way is use the gon gem to access some controller value in your javascript. please check what is best for you please check the below links for more help
http://apidock.com/rails/ActionController/Helpers/ClassMethods/helper_method
https://github.com/gazay/gon
http://railscasts.com/episodes/324-passing-data-to-javascript
My default templating engine is haml, but I would to sometimes change it to erb if i specify a specific parameter?
For example, I am pasting in some html code and would just like to test the code without HAML complaining about its format.
Any idea how to do this?
do something like:
if params[:render_erb]
render 'file.html.erb'
else
render 'file.html.haml'
end
and call the action with ?render_erb=true
or
render "file.html.#{params[:render]}" ir params[:render]
and call it ?render=haml or ?render=erb (or nothing and it will use the default
at the end of the controller's action that you are using
Am I wrong that you simply need to save file as your_file.html.erb instead of your_file.html.haml?
You can use different templates in the same application, and you can use different template engines for views, partials, and layouts, but as far as I know you can't duck in and out of multiple template engines within the same template file.
If you just want to drop some code in using a different template language, then I'd put it in a separate partial. That certainly seems easiest in this particular case.
I am creating a method to generate an XML document via Ruby Builder.
Where should I put the method that created the XML markup? Should it be a method on the model?
I plan to have the XML document pull from multiple models via associations, so I think I need to have it in the controller or a helper, but I would like some in put on the best place.
If it's practical for you, I'd put it in your views folder. This lets you follow the traditional pattern of "load stuff in the controller; render stuff in the view," and has the extra perk of keeping what's probably a messy and very specific method in its own file and out of the way.
Now, I'm not sure if there's a Ruby Builder template format, but you could always just wrap your code in <%= ... %> and treat it like a regular ERB file - should work about the same.
Hope that helps!
I have a submit button that is a block of HTML code because of styling and images to make it look better. (I stole most of it from Wufoo).
This is one every form in the application and I was wondering if there is a cleaner way to do this. Something like a partial or helper?
The name of the button "Submit" or "Add Contact" needs to be a variable.
snippet
Add Contact #variable text
Back
* Required
You can use a application-wide helper for this. Helpers are modules containing methods that are shared by multiple views. You can easily define your own helper that works like the 'submit_tag' helper method that generates the button.
consider partials (http://api.rubyonrails.org/classes/ActionView/Partials.html)
Seems like something partials were invented for.