Katex css/js not included

[jpf91]

Hi,

sorry if this is a dumb question, but I couldn't find a solution.
I'm using the latest version of the PaperMod theme and hugo v0.140.2.

I've added this to layouts/partials/extend_head.html:

{{ partial "katex/assets/css" . }}
{{ partial "katex/assets/js" . }}

And if I add some debug text there I also see that it's always included. However, if I run hugo serve, add the example to a post and save:

{{< katex >}}
\begin{array}{l}
E*{o 1}=\frac{1}{2}\left( { target }*{o 1}- { out }_{o 1}\right)^{2}=\frac{1}{2}(0.01-0.75136507)^{2}=0.274811083 \\
E_{o 2}=0.023560026 \\
E*{ {total }}=E*{o 1}+E\_{o 2}=0.274811083+0.023560026=0.298371109
\end{array}
{{< /katex >}}

Then the latex does not render and the CSS and JS is not included. If I now open extend_head.html and save it, hugo recompiles, the page reloads, the imports are there and Katex renders. But if I now modify the article and save that file, it doesn't render again. Any idea what could cause this?

[razonyang]

I couldn't replicate this with PaperMod (latest version). Would you be willing to share a minimal repository for testing purposes?

The KaTeX diagrams were rendered correctly when editing the extend_head, content file with or without KaTeX.

[jpf91]

Hi @razonyang, thanks for looking into this!

I've pushed a minimal reproduction repository here: https://github.com/jpf91/katex-repro

The easiest way to reproduce: If I just run hugo serve and open the blog post, math is not rendered. If I then edit and save extend_head.html and reload the web page, it renders.

[razonyang]

There is a workaround to replace the extend_head with the following template instead, to make sure the content was processed first, then generate the CSS and JS markup.

{{ $data := dict "page" . }}
{{ with (templates.Defer (dict "data" $data)) }}
  {{ partial "katex/assets/css" .page }}
  {{ partial "katex/assets/js" .page }}
{{ end }}

It's a bug. I will take a close look at it if I have time, so please do not close the issue.

[jpf91]

The workaround seems to be working, thanks a lot 😄