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I came across a PDF which mutually links TOC entries and the headings present in the text body. It was created using Adobe Indesign. If I am reading the book and need to take a look at the TOC I can easily click the heading itself to see it in TOC. This will be a helpfull feature if content has many sub-headings. Are there any packages to achieve this functionality. Please guide.

First, using etoolbox's patchcmd, one can add to the TOC filling a command for the creation of an hypertarget :

patchcmd{addcontentsline}{{#2}{#3}{thepage }}%

   {{#2}{#3}{protecthypertarget{back@currentHref}{}thepage }}%

   {typeout{*patch success}}{typeout{*patch failure}}

Here I have chosen to alter directly the addcontentsline command as it is still called by the LaTeX @startsection (actually @sect) after its modification by hyperref. This enable to affect all the titles in the TOC.

Second, one has to add the hyperlink on the sectioning titles. In both article and book standard classes, this is achieved by redefinition of the Sectionformat introduced in @sect by hyperref:

AtBeginDocument{renewcommand{Sectionformat}[2]%

    {ifnum #2>c@secnumdepth {#1}elsehyperlink{back@currentHref}{#1}fi}}

Finally an MWE is:

% !TEX encoding = UTF-8

documentclass{article}

usepackage[utf8]{inputenc}

usepackage{etoolbox}

usepackage{blindtext}

usepackage{hyperref}

makeatletter

patchcmd{addcontentsline}{{#2}{#3}{thepage }}%

   {{#2}{#3}{protecthypertarget{back@currentHref}{}thepage }}%

   {typeout{*patch success}}{typeout{*patch failure}}

AtBeginDocument{renewcommand{Sectionformat}[2]%

   {ifnum #2>c@secnumdepth {#1}elsehyperlink{back@currentHref}{#1}fi}}

makeatother



begin{document}

tableofcontents

clearpage

Blinddocument

Blinddocument

Blinddocument

Blinddocument

Blinddocument

Blinddocument

end{document}

Of course the ugly link appearance can be improved with the suitable hypersetup{...}

Some caveats :

• This code is rather simple, but will likely conflict with any other classes or packages modifying titles and/or tableofcontents, namely the popular titlesec and titletoc packages, or etoc or tocloft, etc.


• Nevertheless, it can surely be adapted to other situations, by looking as the content of the sectioning macro by using meaning
  


• In this spirit, the same procedure can be surely be used to modify the chapters in the book class, it will require to patch the @makechapterhead macro.


• There is still a small default: the backlink opens the TOC page but the upper visible line is not the linked one, but the one just followingit.