footnotespage-breaking
Is there a way to keep all footnotes on the page where they belong to? I have several (20-30) footnotes per page (some short, some stretch over multiple lines). Sometimes latex places the last one or two footnotes on the next page.
Is there a way to enforce a strict footnote placement?
The para option of the footmisc package (which was the starting point of the linked question) is suited for a "regular full page environment".
\documentclass{article}
\usepackage[para]{footmisc}
\textheight=100pt% just for the example
\begin{document}
Some text.\footnote{A footnote.}
Some text.\footnote{Another footnote.}
Some text.\footnote{And yet another footnote which (finally!) ends on a new line.}
\end{document}
This writes the footnotes to the aux file, so it takes two passes. At the end of every page it checks for any footnotes on the next page and adds them to the queue. They may appear out of order wrt normal footnotes (outside tcolorbox).
Another possible problem is if a footnote is placed near the bottom of the page, in which case the footnote and its mark will cycle, never being on the same page. Use a separate \footnotemark and \footnotetext to force the placement.
\documentclass[12pt]{article}
\usepackage[utf8]{inputenc}
\usepackage[ % Define your margins here
a4paper,
left=2.5cm,
right=2.5cm,
bottom=2.5cm,
textheight=650pt,
footskip=50pt
]{geometry}
\usepackage{lipsum,changepage}
\usepackage[breakable,hooks]{tcolorbox}
\newif\iffootaux
\newcounter{footaux}% for \csname
\newcounter{auxpage}% to handle frontmatter etc.
\setcounter{auxpage}{1}
\makeatletter
\tcbset{every box/.style={before upper app=\tcb@footnote@setup}}
\def\tcb@footnote@setup{\let\footnotetext=\footaux
\let\footnote=\footnoteaux}
\def\footnoteaux{\@ifnextchar[\@xfootnoteaux{\stepcounter{footnote}%
\footnotemark[\thefootnote]\@footaux[\thefootnote]}}
\def\@xfootnoteaux[#1]{\footnotemark[#1]\@footaux[#1]}
\def\footaux{\@ifnextchar[\@footaux{\@footaux[\thefootnote]}}
\def\@footaux[#1]#2{\protected@write{\@auxout}{\let\theauxpage\relax}{\string\newfootnote{\theauxpage}{#1}{#2}}}
\newcommand{\newfootnote}[3]{% #1 = \theauxpage, #2 = \thefoontnote, #3 = text
\ifnum#1=1\relax
\footnotetext[#2]{#3}%
\else
\stepcounter{footaux}%
\expandafter\xdef\csname footauxpage\thefootaux\endcsname{#1}%
\expandafter\xdef\csname footauxnumber\thefootaux\endcsname{#2}%
\expandafter\protected@xdef\csname footauxtext\thefootaux\endcsname{#3}%
\fi}
% to run at the end of every page (debug version)
\newcommand{\addfootaux}{\loop
\@ifundefined{footauxpage\thefootaux}{\footauxfalse}{%
\count1=\csname footauxpage\thefootaux\endcsname\relax
\advance\count1 by -1
\ifnum\count1=\value{auxpage}%
\expandafter\let\expandafter\footauxnumber\csname footauxnumber\thefootaux\endcsname
\expandafter\let\expandafter\footauxtext\csname footauxtext\thefootaux\endcsname
\footnotetext[\footauxnumber]{\footauxtext}%
\footauxtrue
\else
\footauxfalse
\fi}
\iffootaux
\global\expandafter\let\csname footauxpage\thefootaux\endcsname\relax
\global\expandafter\let\csname footauxnumber\thefootaux\endcsname\relax
\global\expandafter\let\csname footauxtext\thefootaux\endcsname\relax
\stepcounter{footaux}%
\repeat
\stepcounter{auxpage}}
\makeatother
\AtBeginDocument{\setcounter{footaux}{1}}% reset counter after \newfootnote
\AddToHook{shipout/after}{\addfootaux}
\begin{document}
\begin{tcolorbox}[breakable,
colback=blue!7!white,
colframe=blue!75!black,
title=Protocole détaillé:
]
\let\footnotetext=\footaux
\lipsum[1-4]
Nous avons mis en suspension
le pellet\footnote{Egalement appelé culot en français, il correspond au fond
du tube dans lequel les diatomées se sont agglomérées.}
\lipsum[1-1]
Nous avons ensuite introduit le contenu dans des tubes à cryogénisation pour faire
un shock freeze\footnote{Méthode qui consiste à plonger brusquement les tubes
dans de l'azote liquide afin de détériorer les membranes.}.
Nous avons ajouté ensuite du $\beta$-mercaptoéthanol et
du Tween qui servent à lyser\footnote{Ouvrir, voire détruire les membranes des cellules.}
\lipsum[1-5]
\end{tcolorbox}
\end{document}
Best Answer
20 to 30 footnotes per page is unusual, so it's not surprising that default latex classes don't handle it well. The
footmiscpackage has a feature (optionpara) to avoid starting a new line for each short footnote, which may help a little.\dimen\footins(default8truein) gives the maximum amount of space that Latex will allow for footnotes on one page. You can try increasing this.You should also set
\raggedbottomand\addtolength{\topskip}{0pt plus 10pt}to help tex look for page breaks before it's too late. (See this FAQ answer for the reason behind the stretchy\topskip).Critical editions typically have a large number of footnotes, so possibly
ledmacor one of the other packages for that purpose will have some features that can help you (I haven't checked).