On Friday, 23 July 2021 at 16:06:31 UTC-7 Leena Murgai wrote:

Thanks for the reply John.

I've been playing around with an equation in LaTeX and seeing what comes out in HTML5 and also looking at what pandoc-crossref expects to find in the markdown.

LaTeX equation format:
\begin{equation} \label{eq:label}
equation
\end{equation}
Note: \label{eq:label} must be inside the equation environment, above is how I do it, but equally one can place the label after equation.

I tried moving label around in my LaTeX to see if it made a difference to the output HTML since pandoc-crossref expects to find the label after the equation environment. Here's the HTML output in each case:

1. \label{eq:label} after \begin{equation}:

<span class="math display">\label{eq:label}equation</span>

2. \label{eq:label} after equation:

<span class="math display">equation\label{eq:label}</span>

3. \label{eq:label} after \end{equation}: Note that this will break the LaTeX code

<span class="math display">equation</span><span>[eq:label]</span>

So, none of the above seem to give pandoc-crossref what it needs. Honestly, I'm not massively familiar with HTML and css - just figuring it out as I go. I imagine whatever pandoc-crossref would output (if I could get it to work) would be great. My quick and dirty approach (to get something like what LaTeX gives) would be to put the equation and its label in a table row. Something like

<div>
<table width=100% style="border: none;">
<tr>
<td style="text-align: center; border: none;"><span id="eq:label" class="math display">equation</span></td>
<td style="text-align: right; border: none; width: 5%;">(chap#.value{eq:label})</td>
</tr>
</table>
</div>

I'm open to suggestions if hard coding 5% for the label width seems like a bad idea or some such.

Thanks,
Leena

On Wednesday, 21 July 2021 at 22:24:47 UTC-7 John MacFarlane wrote:

As I said:

Just let us know what you want to appear in the HTML, and we can
show you how to do it.

Leena Murgai <leena...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> writes:

> Hi John,
>
> Can you clarify your work around here? I wasn't able to follow.
>
> I have a similar problem converting from LaTeX to HTML5 - \label and \ref
> for equations don't work. I'd be super grateful for any advice you could
> offer.
>
> Thanks!
> Leena
>
> On Tuesday, 29 June 2021 at 11:23:40 UTC-7 John MacFarlane wrote:
>
>>
>> This isn't yet supported, really. But you might be able to
>> work around it.
>>
>> Note:
>>
>> % pandoc -f latex -t native
>> \ref{foo}
>> ^D
>> [Para [Link ("",[],[("reference-type","ref"),("reference","foo")]) [Str
>> "[foo]"] ("#foo","")]]
>>
>> So when pandoc parses \ref{foo}, it doesn't just create a string
>> [foo]; it creates a link with attributes. You could use a lua
>> filter to turn this into something that mathjax can consume
>> (raw tex, I would imagine).
>>
>> Just let us know what you want to appear in the HTML, and we can
>> show you how to do it.
>>
>> Ian Price <ianpr...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> writes:
>>
>> > Hello,
>> > My university is looking into the options for converting various notes,
>> > exercises sheets, presentations, etc. from latex generated pdf into a
>> more
>> > accessible format. This basically means converting to html + mathjax
>> > because this tends to work better for screen readers. Converting beamer
>> > seems to be impossible, but for notes pandoc (and some others like
>> latexml)
>> > is generally giving good output, however the major issue is cross
>> > referencing between text and maths blocks.
>> >
>> > In short, mathjax can handle internal links from maths blocks to other
>> > maths blocks, and pandoc can handle links to other parts of pandoc
>> > documents, except when a document makes specific reference to an
>> equation.
>> > For example, suppose we have the following mwe.tex cut out from some
>> > electromagnetism notes
>> > ---
>> > \documentclass[12pt]{article}
>> > \begin{document}
>> > \begin{equation}
>> > J \equiv \frac{dI}{da_{\perp}} = \rho v.
>> > \label{volume-current-density}
>> > \end{equation}
>> > The total current crossing a surface $S$ can be calculated by
>> integrating
>> > Eq. (\ref{volume-current-density}):
>> > \end{document}
>> > ---
>> > When converted to markdown, we get the following
>> > ---
>> > $$J \equiv \frac{dI}{da_{\perp}} = \rho v.
>> > \label{volume-current-density}$$
>> >
>> > The total current crossing a surface $S$ can be calculated by
>> > integrating Eq.
>> >
>> ([\[volume-current-density\]](#volume-current-density){reference-type="ref"
>> > reference="volume-current-density"}):
>> > ---
>> > The link to the label volume-current-density is clearly broken and when
>> I
>> > get my html file it does nothing in particular.
>> >
>> > One solution I've seen is to convert the label references to the syntax
>> > used by, e.g., pandoc-crossref, but this involves me editing the
>> markdown
>> > by hand. Is there an automatic way to convert these?
>> >
>> > --
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>>
>
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