Passing variables from application.html.erb to controller in Rails?

Question

I have a variable inside application.html.erb's <script>:

...
<script>
  ...
  pos = {
    lat: position.coords.latitude,
    lng: position.coords.longitude
  };
  ...
</script>

Is there a way to pass it down to one of my controllers (posts_controller.rb)'s method (some_method)?

I need to get both latitude and longitude that is generated inside the script into posts_controller. How can I do this?

EDIT: (I didn't mention it, but some_method does not use get 'some_method', but post)

#routes
post 'some_method' => 'posts#scrape', as: :some_method

Community · Accepted Answer · 2017-05-23 11:53:40Z

1

GET request

You could use

window.open("/posts/some_method?longitude="+pos['lng']+"&latitude="+pos['lat'],"_self")

inside your <script>.

POST request

With jquery, you could use :

$.post("/posts/some_method?longitude="+pos['lng']+"&latitude="+pos['lat'])

For vanilla javascript, see this answer.

In some_method, longitude and latitude will be available in params[:longitude] and params[:latitude].

You can set instance variables (e.g. @lat and @lon) inside some_method, and those variables will be available in the corresponding view.

edited May 23, 2017 at 11:53

CommunityBot

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answered Dec 29, 2016 at 23:25

Eric Duminil

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2 Comments

Iggy Over a year ago

Hi Eric! Thanks for the response. I did not elaborate (which is entirely my fault), but some_method is not a GET request, but a POST request. Can you suggest another method to pass down variable to a non-GET method? I edited my post to add the method.

Iggy Over a year ago

Thanks! Sorry that I keep asking, but now that I used jquery to post longitude and latitude attributes for Post, how can I capture it on some_method (and display it on views?) Much appreciate the help!

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