Your API looks great!
Did you think about writing JS library with similar API (without socket as first argument)? I think it’s really clear and easy to learn. I can do this too if you don’t have any copyrights restrictions.
Eiji
2
grych
Creator of Drab
@vic,
Drab 0.2.0, just released, is now modular. This means that Drab.Query and Drab.Modal are not obligatory - you may specify the list of modules to use on the Commander:
use Drab.Commander, modules: [Drab.Query]
In your case, when you need to have only basic functions execjs, you’ll use:
user Drab.Commander, modules: []
This will load the Drab.Core (which is neccessary and is always included) only.
Check out more here Drab: Server Side User Interface Access - the small description or download the sandbox project (GitHub - grych/drab_example_nojquery: Drab (browser access from the server) installed without jQuery modules · GitHub).
There is more: this architecture is open for extending Drab. You may create your own module (for example for react) with corresponding JS template and put it in your project. Let’s make Drab growing!
5
grych
Creator of Drab
Go on! Just give a note that the idea is borrowed from Drab. I am not planning to do any JS libraries myself 
2
Eiji
@grych: I have new idea.
Did you already have implemented events?
You could do something like:
alias Drab.Event
Event.add(:method, [target_name: "target value"], [attr_name: "attr value"], &callback/3)
Event.remove(opts)
# Examples:
Event.remove(callback: &callback/3) # remove all events with specified callback
Event.remove(target: [id: "#my_special_btn"]) # remove all events that affects specified element
# ...
defmodule MyApp.Callbacks.MySpecialBtn do
# maybe GenStage consumer?
def on_delete_btn_class(socket, btn, changes) do
# btn is map/struct for target button - struct from HTML element
# changes is for example: {:deleted, :css, "btn"}
end
end
Event.add(:delete, [class: "btn"], [id: "#my_special_btn"], &MyApp.Callbacks.MySpecialBtn.on_delete_btn_class/3)
Add force: true (default to false) if our target matches another selector
alias Grab.Event
Event.add(:update, [], [class: "btn"], &callback/3, force: true)
# add event for all updates on elements with class: btn
update(socket, style: "font-size", set: 6, unit: :px, on: "#button")
so if element with #btn has class btn and we set force: true then we should start callback
2
grych
Creator of Drab
@hubertlepicki,
Thanks for info, looks like StartCom certificates are no longer on the Chrome Root CA list - Google Online Security Blog: Distrusting WoSign and StartCom Certificates
Does anyone know any other free certificate issuer?
BTW the reason why I use SSL with the demo page is that some proxy servers does not allow websockets over http.
2
OvermindDL1
StartCom is utterly horrible horrible horrible, never use them!
For SSL there is no reason not to be using Let’s Encrypt. 
7
grych
Creator of Drab
OvermindDL1
It is pretty high security, has to be renewed every month, but there are automation things galore for that for every web server or even just to add as a cron job.
/me is lazy and just uses a cron job one to update nginx certs.
3