respond_to js "unknown format"

Question

I have this action in my PagesController:

def webhook
  respond_to do |format|
    format.js
  end
end

I get an error ActionController::UnknownFormat when trying to access /webhook.

I have a webhook.js.erb file in my PagesController, and a route associated:
get '/webhook', to: 'pages#webhook'

But I used this syntax previously and it worked so I have no idea what's going on.

How could I fix this ?

EDIT: Now, I've added :format => :js to my link_to, and when I click, the browser displays the js file webhook.js.erb Here is my link_to:

 <%= j link_to "Category", webhook_path(:format => :js), method: :post %>

I just have this in my webhook.js.erb to test it:

alert("h");

What I expect is that when I click on my link, an alert shows up on the page

Could you check if the file webhook.js.erb is in app/views/pages please ? — Pholochtairze, Apr 13 '16 at 07:06
i think you are not calling js call, it is due to html call. can you share code how you are calling this action ? — z.shan, Apr 13 '16 at 07:09
@dkp I tried: respond_to do |format| format: :js end but I get this error: syntax error, unexpected ':', expecting keyword_end — Graham Slick, Apr 13 '16 at 07:09
@z.shan I just have this action, am I supposed to be able to access the page /webhook in my browser or should it only work with get/post requests ? — Graham Slick, Apr 13 '16 at 07:12
@GrahamSlick how you are hitting this action ? there must be form `link_to` or something in your view where you have mentioned the path to this action. There you need to pass `format: :js`. It would be better if you could show your view code and server log. — dp7, Apr 13 '16 at 07:18
@dkp you're right I had to specify it in my link_to, but now it renders the js file, but doesn't execute it. How can I have it executed and not displayed ? Here is my link_to: <%= j link_to "Category", favorite_category_path(:id => category.id, :format => :js), method: :post %> — Graham Slick, Apr 13 '16 at 07:28
try this one <%= j link_to "Category", favorite_category_path(:id => category.id), method: :post, remote: true %> — z.shan, Apr 13 '16 at 07:47

score 2 · Accepted Answer · edited Sep 11 '17 at 08:26

2

Try:

<%= j link_to "Category", favorite_category_path(id: category.id), method: :post, remote: true %>

And your controller:

respond_to do |format|
  format.js
end

edited Sep 11 '17 at 08:26

Sebastián Palma

answered Apr 13 '16 at 07:17

z.shan

dp7 · Answer 2 · 2016-04-13T08:43:19.987

2

You need to specify the remote: true in your link_to:

<%= link_to "Category", favorite_category_path(:id => category.id), method: :post, remote: true %>

edited Apr 13 '16 at 08:43

answered Apr 13 '16 at 07:35

dp7

Thanks, it helped, but I still have an issue with the file being displayed instead of executed. I've edited my post – Graham Slick Apr 13 '16 at 07:39
@GrahamSlick are you getting any error in your log ? – dp7 Apr 13 '16 at 07:57
I get this : Rendered categories/webhook.js.erb (0.1ms) Completed 200 OK in 118ms (Views: 25.5ms | ActiveRecord: 24.2ms) Which is indeed the file I want, but I want it to be executed not rendered – Graham Slick Apr 13 '16 at 08:16
@GrahamSlick check my updated answer, you just need to add `remote: true` to make an ajax request which would execute your `js`. And, you do not need to `escape_javascript` or `j` before `link_to`. – dp7 Apr 13 '16 at 08:45

2 Answers2