yaBliznyk
How to write correct view helper
defmodule Promo.OrderView do
use Promo.Web, :view
alias Promo.Page
def page_title(page = %Page{}) do
for {tag, class} <- [h5: "hide-on-small-only", h6: "hide-on-med-and-up"] do
content_tag tag, class: class do
page.title <> page_sub_title(page.sub_title)
end
end
end
def page_sub_title(nil), do: ""
def page_sub_title(sub_title) do
"<br><small>" <> sub_title <> "</small>"
end
end
In view i see escaped html string with small and etc.
How to write helper function “page_title” what return to me:
h2 title + br + small sub_title /small /h2, but
only h2 title /h2 if sub_title do not exists??
Marked As Solved
yaBliznyk
I find correct answer. Thanks for help
def page_title(page = %Page{}) do
for {tag, class} <- [h5: "hide-on-small-only", h6: "hide-on-med-and-up"] do
content_tag tag, class: class do
do_page_title(page.title, page.sub_title)
end
end
end
defp do_page_title(title, nil), do: title
defp do_page_title(title, sub_title) do
~e{<%= title %><br><small><%= sub_title %></small>}
end
Also Liked
OvermindDL1
For any view helpers, first I have these at the top of my module:
import Phoenix.HTML
import Phoenix.HTML.Form
import Phoenix.HTML.Link
import Phoenix.HTML.Tag
Just for convenience sakes.
However, to do what you want:
def page_sub_title(nil), do: ""
def page_sub_title(sub_title) do
~e"""
<br><small><%= sub_title %></small>
"""
end
The ~e sigil when you import the Phoenix view stuff gives you inline ‘eex’ templating, just like eex files. This is the best way to work with it.
However, you can always wrap your output in a {:safe, content} tuple, but that is not recommended unless you are sure it is entirely safe, and considering I do not see where sub_title is coming from (possibly user input through database or so), I’d use eex to make sure everything gets properly escaped or bad bad bad things can happen.
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