LaTeX equation support

[John Helveston]

Hi everyone, in a recent survey I tried including a LaTeX math equation using $$ to denote  math mode, but it doesn't render. For example, $x$ just renders as \$x\$, so it's taking the $ symbol as a literal symbol. Any ideas on how to show equations in formr? My hack for now is just to save it as an image and show the image.

[Ruben Arslan]

Hi John,

formr renders markdown differently in three contexts:

label attributes without R code are rendered as HTML in PHP without rmarkdown (and so without math mode)

label attributes with R code are rendered as HTML with rmarkdown but only snippets (so I'm guessing math mode won't work)

R code in Stop Buttons, Pages, and in note_iframe labels is rendered as a full page by rmarkdown, so I'd expect math mode to work.

I haven't tried it myself though.

Best wishes,

Ruben

On Wed, Oct 20, 2021 at 10:15 PM John Helveston <john.he...@gmail.com> wrote:

Hi everyone, in a recent survey I tried including a LaTeX math equation using $$ to denote  math mode, but it doesn't render. For example, $x$ just renders as \$x\$, so it's taking the $ symbol as a literal symbol. Any ideas on how to show equations in formr? My hack for now is just to save it as an image and show the image.

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[John Helveston]

Thanks Ruben!

Okay, I tested each case and you're right - here's a demo. 

The note_iframe type was the only one that rendered the math (screenshot attached). 

The only issue is that with note_iframe I also see a code chunk of everything being called. 

Is there a way to hide that? I've tried a few things but can't quite figure it out.

Cheers,

JP

[Ruben Arslan]

Hi John,

you're in testing mode right? You shouldn't see code chunks once you use it as a "real" user,

or if you toggle testing mode off in the user overview.

Best wishes,

Ruben

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[John Helveston]

No I still saw the message even inside a run as a real user. 

[Ruben Arslan]

Can't reproduce this behavior. https://helveston-test.formr.org/ this is just your survey in a run.

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[John Helveston]

Strange, no matter what I do in my run I always see it. Is there some setting in your run that you changed? 

[John Helveston]

That solved it!...should have known better about the caching.