Hi, I’m going through the examples on the drab page. In the ‘chat example’ section, in the code example. defhandler update_chat(socket, sender) do nick = get_store(socket, :nickname, "Anonymous") html = ~E"<%= nick %>: <%= message %> " |> safe_to_string() broadcast_insert…

That comes from Phoenix HTML package: “Provides ~E sigil with HTML safe EEx syntax inside source files”. Phoenix.HTML — Phoenix.HTML v4.3.0

It is important to use safe when you build html from the outside source, like inputs. Future versions of Drab will take safe directly , so you’ll not have to add safe_to_string/1.

Trying chat example as well. Getting page_commander.ex:13: undefined function safe_to_string/1

Do import Phoenix.HTML in the commander, or just call Phoenix.HTML.safe_to_string directly.

Tried to call module.function, that gave page_commander.ex:14: undefined function sigil_E/2. Now, page_commander.ex:16: undefined function message/0 it’s the 3rd line in defhandler update_chat(socket, sender) do nick = get_store(socket, :nickname, "Anonymous") html = ~E"<%= nic…

You need to define message within the function. It’s currently not defined and the program assumes its some undefined function. What I did was get the message value from the sender. message = sender["value"] Or something similar, I’ll post the actual code when I get the chance.

Yes, I made a mistake when copying the code to the html, will be added soon. message = sender["value"] is correct.

Yes, this works: defhandler update_chat(socket, sender) do nick = get_store(socket, :nickname, "Anonymous") message = sender["value"] html = ~E"<%= nick %>: <%= message %> " |> safe_to_string() ...

@grych another issue with chat: defmodule AppWeb.PageCommander do use Drab.Commander #, modules: [Drab.Presence] import Phoenix.HTML import Drab.Presence gives error: ** (CompileError) lib/olist_no_brunch_web/commanders/page_commander.ex:4: module Drab.Presence is not loaded and could not b…

Which version of Drab do you have? Try to: remove import Drab.Presence from the commander, it is not needed. remove Drab.Presence from default modules do mix clean You may always take a look on the Drab Examples Page source to find out how it is done.

Yes, that page was my reference, but I couldn’t find the difference. The only 1 I see now is that you are using own module to store data worker(DrabPoc.Presence, []), but the app should work w/o it. After your instructions had same error. Removed _build dir, restarted app, and now it works!

Elixir Programming Language Forum

What is the ~E sigil in the Drab tutorial?

Questions & Help Questions

grych February 18, 2019, 4:15pm 19

Thanks for the explanation. I am going to check it!
Thanks.