"If or" and "if and" with .Section - need help making this DRYer

support
1

I feel like this is something I should be getting by this point, but…

I have a top bar section in a site I’m building that I want to show the section title if it’s in either the “tutorials” or “articles” section of the site. Right now, I have an if and if else statement that just repeats the same templating. Keep in mind this is at the page level (i.e., not on a list or node). I’ve tried the following with no luck:

{{if or (eq .Section "tutorials")(eq .Section "articles")}}
...here is some stuff to show in the top bar...
{{end}}

But I’m getting an incomplete template error in the console. I also tried with both “==” and moving the position of or. Since the top bar is used across every page, I thought maybe I needed to add a first if with .IsPage, but that still created the same error, which was a nonissue when I created the if/if else templating that is now working without issue. This is more of an attempt to make things drier than necessarily a hurdle to overcome. Thanks!

update Figured the working code might make this clearer:

@digitalcraftsman you tend to be my guru in this arena. Thoughts?

2

Hi @rdwatters,

I cloned your repo and tested your first approach with

{{ if or (eq .Section "tutorials") (eq .Section "articles") }}
// your prev / next links
{{ end }}

and everything worked fine. Note that you have to put a space between the parentheses (eq ...) (eq ...).

Otherwise please post the error message from the terminal.

4 Likes
3

Well, I guess I can’t feel too bad that I had the templating wrong, but missing a space? Bush league on my part, haha. All good now.

As always, thanks for your help, brother!

4

Great to hear that it worked. Such errors that can easily be overseen are the worst :slightly_smiling:

5

Maybe someone knows why this line is not working?

{{ if and ($authors := .Params.authors) (ne $authors "none") }}

I want to with condition $authors=none strings does not processed, but they continue to be processed, although {{ printf "%S" $authors }} shows [%!S(string=none)].

6

An assignment ($authors := .Params.authors) inside an if-statement doesn’t make sense.

What datatype is .Params.authors? Is it a list, map or just a string? Depending on this we could choose the right template funcs for the comparison.

7

.Params.authors is taxonomy and defined in the front matter as:

---
authors:
  - none
---

{{ printf “%S” .Params.authors }} shows: [%!S(string=none)]

8

Maybe it is wrong, but it works. If the $authors is not defined, strings inside the “If” are not processed. Variable $author also receives the correct value.

9

You can check if none is an element of the authors list with this snippet:

{{ with .Params.authors }}
  {{ if not (in . "none") }}
  // do some stuff
  {{ end }}
{{ end }}

But why do you not just check if the list is empty?

10

Thank @digitalcraftsman. This is working code:

{{ with $authors := .Params.authors }}
  {{ if not (in . "none") }}
  (авт. {{ delimit (first 1 $authors) "" }})
  {{ end }}
{{ end }}

How it looks:

none-1.png798×383 25.3 KB

11

Just a tip: you can’t use the %s sequence to print map/slice The error you get is “%!S”, which is telling you that the parameter is not a string. Use %v instead. Examples:

{{ printf "%v" .Params.authors }}
{{ printf "%+v" .Params.authors }}
{{ printf "%#v" .Params.authors }}

See fmt for more info.

1 Like