< LaTeX

LaTeX

Getting Started

1. Introduction
2. Installation
3. Installing Extra Packages
4. Basics
5. How to get help

Common Elements

1. Document Structure
2. Text Formatting
3. Paragraph Formatting
4. Colors
5. Fonts
6. List Structures
7. Special Characters
8. Internationalization
9. Rotations
10. Tables
11. Title creation
12. Page Layout
13. Customizing Page Headers and Footers‎
14. Importing Graphics
15. Floats, Figures and Captions
16. Footnotes and Margin Notes
18. Labels and Cross-referencing
19. Initials

Mechanics

1. Errors and Warnings
2. Lengths
3. Counters
4. Boxes
5. Rules and Struts

Technical Texts

1. Mathematics
3. Theorems
4. Chemical Graphics
5. Algorithms
6. Source Code Listings
7. Linguistics

Special Pages

1. Indexing
2. Glossary
3. Bibliography Management
4. More Bibliographies

Special Documents

1. Scientific Reports (Bachelor Report, Master Thesis, Dissertation)
2. Letters
3. Presentations
4. Teacher’s Corner
5. Curriculum Vitae

Creating Graphics

1. Introducing Procedural Graphics
2. MetaPost
3. Picture
4. PGF/TikZ
5. PSTricks
6. Xy-pic
7. Creating 3D graphics

Programming

1. Macros
2. Plain TeX
3. Creating Packages
4. Creating Package Documentation
5. Themes

Miscellaneous

1. Modular Documents
2. Collaborative Writing of LaTeX Documents
3. Export To Other Formats

Help and Recommendations

1. FAQ
2. Tips and Tricks

Appendices

1. Authors
3. Package Reference
4. Sample LaTeX documents
5. Index
6. Command Glossary

edit this box • edit the TOC

LaTeX enables typesetting of hyperlinks, useful when the resulting format is PDF, and the hyperlinks can be followed. It does so using the package hyperref.

Contents

• 1 Hyperref
• 2 Usage
• 2.1 Commands
• 2.1.1 \hyperref
• 2.1.2 \url
• 2.1.3 \href
• 2.2 Other possibilities
• 2.2.2 Local file
• 2.2.3.1 Viewing in a browser
• 3 Customization
• 4 Troubleshooting
• 4.1 Problems with Links and Equations 1
• 4.2 Problems with Links and Equations 2
• 4.3 Problems with Links and Pages
• 4.4 Problems with bookmarks
• 4.5 Problems with tables and figures
• 4.6 Problems with long caption and \listoffigures or long title
• 4.7 Problems with already existing .toc, .lof and similar files
• 4.8 Problems with footnotes and special characters
• 4.9 Problems with Beamer
• 4.10 Problems with draft mode
• 5 Notes and References

Hyperref[ edit ]

The package hyperref [1] provides LaTeX the ability to create hyperlinks within the document. It works with pdflatex and also with standard “latex” used with dvips and ghostscript or dvipdfm to build a PDF file. If you load it, you will have the possibility to include interactive external links and all your internal references will be turned to hyperlinks. The compiler pdflatex makes it possible to create PDF files directly from the LaTeX source, and PDF supports more features than DVI. In particular PDF supports hyperlinks. Moreover, PDF can contain other information about a document such as the title, the author, etc., which can be edited using this same package.

Usage[ edit ]

The basic usage with the standard settings is straightforward. Just load the package in the preamble:

 \usepackagehyperref

This will automatically turn all your internal references into hyperlinks. It won’t affect the way to write your documents: just keep on using the standard \label\ref system (discussed in the chapter on Labels and Cross-referencing ); with hyperref those “connections” will become links and you will be able to click on them to be redirected to the right page. Moreover the table of contents, list of figures/tables and index will be made of hyperlinks, too. The hyperlinks will not show up if you are working in draft mode.

Commands[ edit ]

The package provides some useful commands for inserting links pointing outside the document.

\hyperref[ edit ]

Usage:

 \hyperref[label_name]''link text''

This will have the same effect as \reflabel_name but will make the text link text a full link, instead. The two can be combined. If the lemma labelled as mainlemma was number 4.1.1 the following example would result in

 We use \hyperref[mainlemma]lemma \ref*mainlemma . We use lemma 4.1.1.

with the hyperlink as expected. Note the “*” after \ref for avoiding nested hyperlinks.

\url[ edit ]

Usage:

 \url

It will show the URL using a mono-spaced font and, if you click on it, your browser will be opened pointing at it.

\href[ edit ]

Usage:

 \href

It will show the string description using standard document font but, if you click on it, your browser will be opened pointing at my_url. Here is an example:

 \urlhttps://www.wikibooks.org\hrefhttps://www.wikibooks.orgWikibooks home

Both point at the same page, but in the first case the URL will be shown, while in the second case the URL will be hidden. Note that, if you print your document, the link stored using \href will not be shown anywhere in the document.

Other possibilities[ edit ]

Apart from linking to websites discussed above, hyperref can be used to provide mailto links, links to local files, and links to anywhere within the PDF output file.

A possible way to insert email links is by

 \hrefmailto:my_[email protected]my\_[email protected]

It just shows your email address (so people can know it even if the document is printed on paper) but, if the reader clicks on it, (s)he can easily send you an email. Or, to incorporate the url package’s formatting and line breaking abilities into the displayed text, use [2]

 \hrefmailto:my_[email protected]\nolinkurlmy_[email protected]

When using this form, note that the \nolinkurl command is fragile and if the hyperlink is inside of a moving argument, it must be preceeded by a \protect command.

Local file[ edit ]

Files can also be linked using the url or the href commands. You simply have to add the string run: at the beginning of the link string:

 \urlrun:/path/to/my/file.ext\hrefrun:/path/to/my/file.exttext displayed

Following http://tex.stackexchange.com/questions/46488/link-to-local-pdf-file the version with url does not always work, but href does.

It is possible to use relative paths to link documents near the location of your current document; in order to do so, use the standard Unix-like notation (./ is the current directory, ../ is the previous directory, etc.)

It is also possible to create an anchor anywhere in the document (with or without caption) and to link to it. To create an anchor, use:

 \hypertargetlabeltarget caption

and to link to it, use:

 \hyperlinklabellink caption

where the target caption and link caption are the text that is displayed at the target location and link location respectively.

Note also that if you put a hypertarget, when clicking a link to that hypertarget, it may actually direct to the line after the hypertarget, which is not desirable. Therefore if this occurs, you can report the bug and refer to here for a solution.

Customization[ edit ]

The standard settings should be fine for most users, but if you want to change something, that is also possible. There are several variables and two methods to pass those to the package. Options can be passed as an argument of the package when it is loaded (the standard way packages work), or the \hypersetup command can be used as follows:

 \hypersetup [, ...]

you can pass as many options as you want; separate them with a comma. Options have to be in the form:

 variable_name=new_value

exactly the same format has to be used if you pass those options to the package while loading it, like this:

 \usepackage[]hyperref

Here is a list of the possible variables you can change (for the complete list, see the official documentation). The default values are written in an upright font:

Checkout 3.8 Big list at hyperref-manual at tug.org

variablevaluescomment
bookmarks=true,falseshow or hide the bookmarks bar when displaying the document
unicode=false,trueallows to use characters of non-Latin based languages in Acrobat’s bookmarks
pdfborder=RadiusH RadiusV Width [Dash-Pattern]set the style of the border around a link. The first two parameters (RadiusH, RadiusV) have no effect in most pdf viewers. Width defines the thickness of the border. Dash-Pattern is a series of numbers separated by space and enclosed by box-brackets. It is an optional parameter to specify the length of each line & gap in the dash pattern. For example, 0 0 0.5 [3 3] is supposed to draw a square box (no rounded corners) of width 0.5 and a dash pattern with a dash of length 3 followed by a gap of length 3. There is no uniformity in whether/how different pdf viewers render the dash pattern.
pdftoolbar=true,falseshow or hide Acrobat’s toolbar
pdffitwindow=true,falseresize document window to fit document size
pdfstartview =FitH,FitV,etc [3] .fit the width of the page to the window
pdftitle=textdefine the title that gets displayed in the “Document Info” window of Acrobat
pdfauthor=textthe name of the PDF’s author, it works like the one above
pdfsubject=textsubject of the document, it works like the one above
pdfcreator=textcreator of the document, it works like the one above
pdfproducer=textproducer of the document, it works like the one above
pdfkeywords=textlist of keywords, separated by commas, example below
pdfnewwindow(=true,false)define if a new PDF window should get opened when a link leads out of the current document. NB: This option is ignored if the link leads to an http/https address.
pagebackref(=false,true)activate back references inside bibliography. Must be specified as part of the \usepackage{} statement.
colorlinks(=false,true)surround the links by color frames (false) or colors the text of the links (true). The color of these links can be configured using the following options (default colors are shown):
urlcolor=magentacolor of URL links (mail, web)
citebordercolor=0 1 0color of frame around citations
urlbordercolor=0 1 1color of frame around URL links

Please note, that explicit RGB specification is only allowed for the border colors (like linkbordercolor etc.), while the others may only assigned to named colors (which you can define your own, see Colors ). In order to speed up your customization process, here is a list with the variables with their default value. Copy it in your document and make the changes you want. Next to the variables, there is a short explanations of their meaning:

 \hypersetup bookmarks=true, % show bookmarks bar? unicode=false, % non-Latin characters in Acrobat’s bookmarks pdftoolbar=true, % show Acrobat’s toolbar? pdfmenubar=true, % show Acrobat’s menu? pdffitwindow=false, % window fit to page when opened pdfstartview=FitH, % fits the width of the page to the window pdftitle=My title, % title pdfauthor=Author, % author pdfsubject=Subject, % subject of the document pdfcreator=Creator, % creator of the document pdfproducer=Producer, % producer of the document pdfkeywords=keyword1, key2, key3, % list of keywords pdfnewwindow=true, % links in new PDF window colorlinks=false, % false: boxed links; true: colored links linkcolor=red, % color of internal links (change box color with linkbordercolor) citecolor=green, % color of links to bibliography filecolor=magenta, % color of file links urlcolor=cyan % color of external links

If you don’t need such a high customization, here are some smaller but useful examples. When creating PDFs destined for printing, colored links are not a good thing as they end up in gray in the final output, making it difficult to read. You can use color frames, which are not printed:

 \usepackagehyperref\hypersetupcolorlinks=false

 \usepackage[hidelinks]hyperref

or use
\usepackagehyperref

When you just want to provide information for the Document Info section of the PDF file, as well as enabling back references inside bibliography:

 \usepackage[pdfauthor=Author's name,%pdftitle=Document Title,%pagebackref=true,%pdftex]hyperref

By default, URLs are printed using mono-spaced fonts. If you don’t like it and you want them to be printed with the same style of the rest of the text, you can use this:

 \urlstylesame

Troubleshooting[ edit ]

Problems with Links and Equations 1[ edit ]

Messages like the following

! pdfTeX warning (ext4): destination with the same identifier (name
equation.1.7.7.30) has been already used, duplicate ignored

appear, when you have made something like

 \begineqnarraya=b\nonumber\endeqnarray

The error disappears, if you use instead this form:

 \begineqnarray*a=b\endeqnarray*

Beware that the shown line number is often completely different from the erroneous line.

Possible solution: Place the amsmath package before the hyperref package.

Problems with Links and Equations 2[ edit ]

Messages like the following

! Runaway argument?
\@firstoffive \fi ), Some text from your document here (\ref re\ETC.
Latex Error: Paragraph ended before \[email protected]@link was complete.

appear when you use \label inside an align environment.

 \AtBeginDocument\let\textlabel\label

Note: The same error appears if you use a colon “: as part of a label, i.e. \labellst:program01. Replacing that will help.

Problems with Links and Pages[ edit ]

Messages like the following:

! pdfTeX warning (ext4): destination with the same
identifier (namepage.1) has been already used,
duplicate ignored

appear when a counter gets reinitialized, for example by using the command \mainmatter provided by the book document class. It resets the page number counter to 1 prior to the first chapter of the book. But as the preface of the book also has a page number 1 all links to “page 1” would not be unique anymore, hence the notice that “duplicate has been ignored.” The counter measure consists of putting plainpages=false into the hyperref options. This unfortunately only helps with the page counter. An even more radical solution is to use the option hypertexnames=false, but this will cause the page links in the index to stop working.

The best solution is to give each page a unique name by using the \pagenumbering command:

 \pagenumberingalph % a, b, c, ...... titlepage, other front matter ...\pagenumberingroman % i, ii, iii, iv, ...... table of contents, table of figures, ...\pagenumberingarabic % 1, 2, 3, 4, ...... beginning of the main matter (chapter 1) ...

Another solution is to use \pagenumberingalph before the command \maketitle, which will give the title page the label page.a. Since the page number is suppressed, it won’t make a difference to the output.

By changing the page numbering every time before the counter is reset, each page gets a unique name. In this case, the pages would be numbered a, b, c, i, ii, iii, iv, v, 1, 2, 3, 4, 5, …

If you don’t want the page numbers to be visible (for example, during the front matter part), use \pagestyleempty ... \pagestyleplain. The important point is that although the numbers are not visible, each page will have a unique name.

Another more flexible approach is to set the counter to something negative:

 \setcounterpage-100... titlepage, other front matter ...\pagenumberingroman % i, ii, iii, iv, ...... table of contents, table of figures, ...\pagenumberingarabic % 1, 2, 3, 4, ...... beginning of the main matter (chapter 1) ...

which will give the first pages a unique negative number.

The problem can also occur with the algorithms package: because each algorithm uses the same line-numbering scheme, the line identifiers for the second and follow-on algorithms will be duplicates of the first.

The problem occurs with equation identifiers if you use \nonumber on every line of an eqnarray environment. In this case, use the *’ed form instead, e.g. \begineqnarray* ... \endeqnarray* (which is an unnumbered equation array), and remove the now unnecessary \nonumber commands.

If your url’s are too long and running off of the page, try using the breakurl package to split the url over multiple lines. This is especially important in a multicolumn environment where the line width is greatly shortened.

Problems with bookmarks[ edit ]

The text displayed by bookmarks does not always look like you expect it
to look. Because bookmarks are “just text”, much fewer characters are
available for bookmarks than for normal LaTeX text. Hyperref will normally
notice such problems and put up a warning:

Package hyperref Warning:
Token not allowed in a PDFDocEncoded string:

You can now work around this problem by providing a text string for the bookmarks, which replaces the offending text:

 \texorpdfstring''TEX text''''Bookmark Text''

Math expressions are a prime candidate for this kind of problem:

 \section \texorpdfstring$E=mc^2$E=mc2

which turns \section$E=mc^2$ to E=mc2 in the bookmark area. Color changes also do not travel well into bookmarks:

 \section \textcolorredRed !

produces the string “redRed!”. The command \textcolor gets ignored but its argument (red) gets printed.
If you use:

 \section \texorpdfstring\textcolorredRed !Red\ !

the result will be much more legible.

If you write your document in unicode and use the unicode option for the hyperref package you can use unicode characters in bookmarks. This will give you a much larger selection of characters to pick from when using \texorpdfstring.

Problems with tables and figures[ edit ]

The links created by hyperref point to the label created within the float environment, which, as previously described , must always be set after the caption. Since the caption is usually below a figure or table, the figure or table itself will not be visible upon clicking the link [4] . A workaround exists by using the package hypcap [2] with:

 \usepackage[all]hypcap

If you use the wrapfig package [5] mentioned in the ” Wrapping text around figures ” section of the “Floats, Figures and Captions” chapter, or other similar packages that define their own environments, you will need to manually include \capstart in those environments, e.g.:

 \beginwrapfigureR0.5\textwidth \capstart \begincenter \includegraphics[width=0.48\textwidth]filename \endcenter \caption\labellabelnamea figure\endwrapfigure

Problems with long caption and \listoffigures or long title[ edit ]

There is an issue when using \listoffigures with hyperref for long captions or long titles. This happens when the captions (or the titles) are longer than the page width (about 7-9 words depending on your settings). To fix this, you need to use the option breaklinks when first declaring:

 \usepackage[breaklinks]hyperref

This will then cause the links in the \listoffigures to word wrap properly.

Problems with already existing .toc, .lof and similar files[ edit ]

The format of some of the auxilliary files generated by latex changes when you include the hyperref package. One can therefore encounter errors like

! Argument of \[email protected]@link has an extra .

when the document is typeset with hyperref for the first time and these files already exist. The solution to the problem is to delete all the files that latex uses to get references right and typeset again.

Problems with footnotes and special characters[ edit ]

See the relevant section .

Problems with Beamer[ edit ]

Using the command

 \hyperref[some_label]some text

is broken when pointed at a label. Instead of sending the user to the desired label, upon clicking the user will be sent to the first frame. A simple work around exists; instead of using

 \phantomsection\labelsome_label

 \hypertargetsome_label{}

and reference it with

 \hyperlinksome_labelsome text

Problems with draft mode[ edit ]

The hyperlinks can be re-enabled by using the “final=true” option in the following initialization of the hyperref package, just after the package was included:

 \usepackagehyperref\hypersetupfinal=true

A good source of further options for the hyperref package can be found here [6] .

Notes and References[ edit ]

1. Hyperref package webpage in CTAN