Given a String like str = “\“ and then rendering it into some other program like JS or Python:
# index.js.eex
console.log(„<%= str %>“)
# hello.py.eex
print(„<%= str %>“)
results in console.log(„\“)
You see the problem the backslash will escape the closing quote and produce a syntax error in JS
The question is, How should I fix it?
PS: I am writing it on a mobile phone, so the quotes are not correct, will fix it as soon I am on my laptop
You can "javascript encode" the string in elixir.
The rules for JS are that a slash needs to be double-escaped. You can do that yourself, or use something like Phoenix.HTML.javascript_escape
javascript_escape("my string with \")
See the source code here if interested
If you are using Phoenix you might find these useful https://hexdocs.pm/phoenix_html/Phoenix.HTML.html#escape_javascript/1 https://hexdocs.pm/phoenix_html/Phoenix.HTML.html#html_escape/1
Or perhaps convert it to JSON and skip the quotes. Here's an example.
# index.js.eex
console.log(<%= raw(Jason.encode!(str)) %>)
Perhaps a view helper would be better (example for Phoenix):
defmodule MyAppWeb.LayoutView do
use MyAppWeb, :view
def raw_json(data) do
case Jason.encode(data) do
{:ok, result} -> raw(result)
{:error, _reason} -> nil # Depending on what fallback you want
end
end
end
