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<!-- $LynxId: follow_help.html,v 1.16 2017/04/28 21:42:43 tom Exp $ -->
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN">
<html>
<head>
<meta name="generator" content=
"HTML Tidy for Linux (vers 25 March 2009), see www.w3.org">
<title>Help on the Follow link (or page) number feature</title>
<link rev="made" href="mailto:lynx-dev@nongnu.org">
<meta http-equiv="Content-Type" content=
"text/html; charset=us-ascii">
<meta name="description" content=
" Lynx allows the user to select a link using a single-digit shortcut. There are several configuration choices which apply to this feature.">
</head>
<body>
<div class="nav">
<ul>
<li><a href="#overview">Overview</a></li>
<li><a href="#numbering">Zero and other digits</a></li>
<li><a href="#suffixes">Suffixes</a></li>
<li><a href="#form_fields">Specifics for Form Fields</a></li>
<li><a href="#hidden_links">Hidden Links</a></li>
<li><a href="#goto_hidden_link">Navigating to Hidden
Links</a></li>
</ul>
</div>
<h2><a name="overview" id="overview">Overview</a></h2>
<p>If a user has set one of these modes, (as the default or for
the current session via the <em>Options menu</em>) then hypertext
links (and form fields, depending on the keypad mode) are
prefixed with numbers in square brackets:</p>
<ul>
<li><em>Keypad mode</em> to <em>Links are numbered</em>,
or</li>
<li><em>Form fields are numbered</em>, or</li>
<li><em>Links and form fields are numbered</em></li>
</ul>
<p>Entering a keyboard or keypad number is treated as an
<em>F_LINK_NUM</em> command, and should invoke the <em>Follow
link (or goto link or page) number:</em> statusline prompt for a
potentially multiple digit number corresponding to an indicated
link number.</p>
<h2><a name="numbering" id="numbering">Zero and other
digits</a></h2>
<p>The prompt can be invoked via typing a zero (<em>0</em>), but
it will not be treated as the lead digit for the number entry,
whereas digits 1 through 9 both invoke the prompt and are treated
as the first digit.</p>
<p>In <em>Form fields are numbered</em> or <em>Links and form
fields are numbered</em> mode, if the number corresponds to a
form field you will be positioned on that field, but if it is a
submit button it will not be ACTIVATE-ed.</p>
<p>If the user has set <em>Keypad mode</em> to <em>Numbers act as
arrows</em>, then only a zero digit will be treated as an
<em>F_LINK_NUM</em> command for invoking the <em>Follow link (or
goto link or page) number:</em> prompt.</p>
<h2><a name="suffixes" id="suffixes">Suffixes</a></h2>
<p>After accepting a number at the prompt, <strong>Lynx</strong>
accepts an optional suffix:</p>
<dl>
<dt><em>RETURN</em> (activate)</dt>
<dd>Without a suffix, e.g., If <em>RETURN</em> is pressed to
terminate the number entry (e.g., <em>123</em>) and it
corresponds to a hypertext link, <strong>Lynx</strong> will
retrieve the document for that link as if you had paged or used
other navigation commands to make it the current link and then
ACTIVATE-ed it.</dd>
<dt><code><strong>g</strong></code> (go)</dt>
<dd>
<p>If the number entered at the prompt has a
“<em>g</em>” suffix (e.g., <em>123g</em>), then
<strong>Lynx</strong> will make the link corresponding to
that number the current link, paging as appropriate if the
link does not appear in the currently displayed page. The
“<em>g</em>” suffix is inferred (need not be
entered) for form fields in <em>Form fields are numbered</em>
or <em>Links and form fields are numbered</em> mode.</p>
</dd>
<dt><code><strong>p</strong></code> (page)</dt>
<dd>
<p>Alternatively, if the number is given a
“<em>p</em>” suffix (e.g., <em>123p</em>),
<strong>Lynx</strong> will make the page corresponding to
that number the currently displayed page, and the first link
on that page, if any, the current link. The
“<em>g</em>” and “<em>p</em>”
suffixes thus convert the <em>Follow link (or goto link or
page) number:</em> feature to an advanced navigation aid.</p>
</dd>
<dt><code><strong>+</strong></code> or
<code><strong>-</strong></code> (jump)</dt>
<dd>
<p>Finally, a user may add a <em>+</em> or <em>-</em> suffix
to a number command to indicate jumping forward or back
relative to the current link or page. For example, typing
<em>1g+</em> followed by RETURN will move the current link to
the next numbered link, skipping any intervening pages or
unnumbered links; <em>1g-</em> goes to the preceding numbered
link. On a page without links, <em>3g+</em> goes to the 3rd
link <em>following</em> the page. <em>5p+</em> skips ahead 5
pages, and so on. You can also enter <em>5+</em> or
<em>5-</em>, which will activate the 5th link ahead/behind
where you are currently positioned. Note that typing
<em>1g+</em> is different from typing a down arrow in that
<em>1g+</em> skips pages containing no links, or intervening
non-numbered links, such as form fields when form fields are
not numbered. It also differs from the <em><tab></em>
command in that <em>1g+</em> does not skip over whole
textareas, unless form fields are not numbered.</p>
<p><em>NOTE:</em> <em>1+g 1-g 1+p 1-p</em> are all recognized
as equivalent to <em>1g+ 1g- 1p+ 1p-</em> . Any other
(mistyped) characters end the formula: e.g. <em>1gh+</em> is
treated as <em>1g</em>.</p>
</dd>
</dl>
<h2><a name="form_fields" id="form_fields">Specifics for Form
Fields</a></h2>
<p>Numbers are associated with form fields only when</p>
<ul>
<li><em>Form fields are numbered</em> or</li>
<li><em>Links and form fields are numbered</em> mode has been
selected.</li>
</ul>
<p>If you have selected <em>Numbers act as arrows</em> or
<em>Links are numbered</em> mode, you can seek form fields in the
document via WHEREIS searches for strings in their displayed
values. If they are INPUT or TEXTAREA fields with no values as
yet, you can use two or more underscores as the search string,
because underscores are used as placeholders for form fields in
the displayed document.</p>
<p id="select-option">When you have invoked a popup window for a
list of OPTIONs in a form's SELECT block:</p>
<ul>
<li>each OPTION is associated with a number, and that number
will be displayed in <em>Form fields are numbered</em> or
<em>Links and form fields are numbered</em> mode.</li>
<li>In any keypad mode, the <em>F_LINK_NUM</em>
(“<em>0</em>”) command will invoke a <em>Select
option (or page) number:</em> prompt, and you can enter a
number, and optionally a “<em>g</em>” or
“<em>p</em>” suffix, to select or seek an OPTION in
that list.</li>
<li>If only a number is entered at the prompt, the
corresponding OPTION will be selected and the popup will be
retracted.</li>
<li>If the “<em>g</em>” suffix is included, then
you will be positioned on the corresponding OPTION in the list,
paging through the list if necessary, but it will not be
treated as selected unless you enter the ACTIVATE (RETURN or
right-arrow) command when positioned on the OPTION.</li>
<li>For purposes of paging (e.g., in conjunction with the
“<em>p</em>” suffix), a <em>page</em> is defined as
the number of OPTIONs displayed within the vertical dimension
of the popup window.</li>
<li>Finally, the <em>+</em> and <em>-</em> suffixes can be used
to move forward or back from the current option or page in a
popup menu, similarly to the way they are used for links.</li>
</ul>
<p>For example, while viewing a popup window, the user can type
<em>3p+</em> and RETURN to skip ahead 3 pages, and <em>50g-</em>
will move the current selection back 50 options. This will work
whether or not <em>keypad mode</em> is <em>Form fields are
numbered</em> or <em>Links and form fields are numbered</em>
since options are numbered internally. If form field numbering is
turned off, the option numbers will not appear on screen, but the
user can still navigate using these commands.</p>
<h2><a name="hidden_links" id="hidden_links">Hidden
Links</a></h2>
<p>HTML can be structured so that it includes <em>hidden
links</em>, i.e., without a visible link name intended for
ACTIVATE-ing the link. Such links may be created, for example,
by</p>
<ul>
<li>making an IMG element the sole content of an Anchor
element, and including an ALT="" attribute name/value pair to
suppress access to the link when the browser does not have
support for image handling available.</li>
<li>having truly empty Anchor content, in cases for which the
value of an Anchor's HREF attribute is intended as a navigation
aid for robots (typically indexers) and not as content for a
browser's rendition of the document.</li>
<li>using the <em>-ismap</em> command line switch, which makes
<strong>Lynx</strong> additionally treat a link to a
server-side image maps as hidden if there also is a client-side
map for the same image.</li>
<li>bad HTML, which may produce <em>hidden links</em>.</li>
</ul>
<p><em>Hidden links</em> differ from Anchors that have only a
NAME or ID attribute name/value pair (intended as positioning
targets from other links which do have HREF attributes and values
that include a fragment).</p>
<p><strong>Lynx</strong> respects instructions for <em>hidden
links</em> and normally does not include them in the rendition of
the document. However, if the command line switch
<em>-hiddenlinks=merge</em> is used, such links will still be
numbered in sequence with other links which are not hidden, and
if <em>Links are numbered</em> mode is also on, link numbers will
appear for them in the displayed text (except for links to image
maps which are hidden because of <em>-ismap</em>). If
<em>-hiddenlinks=listonly</em> or <em>-hiddenlinks=ignore</em> is
in effect, <em>hidden links</em> will not be shown in the text
even in <em>links are numbered</em> mode. Not using a
<em>-hiddenlinks</em> flag at all is equivalent to
<em>-hiddenlinks=listonly</em>.</p>
<h2><a name="goto_hidden_link" id="goto_hidden_link">Navigating
to Hidden Links</a></h2>
<p>If a document includes <em>hidden links</em>, they will be
reported, with appropriate labeling, in the menus created for the
LIST (“<em>l</em>”) or ADDRLIST
(“<em>A</em>”) commands, unless
<em>-hiddenlinks=ignore</em> is used. They can then be
ACTIVATE-ed via those menus.</p>
<p>If a link was hidden because of an ALT attribute in an IMG
element, it will be converted to a <em>visible link</em> whenever
the IMAGE_TOGGLE (“<em>*</em>”) command is used to
create links for SRC attribute values of IMG elements, because
this indicates that the user does have some form of image
handling enabled via a helper application, or wishes to download
files for subsequent use with a graphic browser or other suitable
software.</p>
<p>HTML forms may have fields with a HIDDEN attribute, indicating
that a name/value pair for the fields should be included in the
content submitted for the form, but the value should not be
displayed in the rendered form. <strong>Lynx</strong> respects
this attribute as well, and neither displays the HIDDEN field,
nor assigns it a number for the F_LINK_NUM
(“<em>0</em>”) command and <em>Form fields are
numbered</em> or <em>Links and form fields are numbered</em>
keypad mode handling, nor includes an entry for it in the menus
created for the LIST (“<em>l</em>”) or ADDRLIST
(“<em>A</em>”) commands. However, the HIDDEN
name/value pairs are included in any displays of submitted form
content in the <em>Information about the current document</em>
that is invoked by the INFO (“<em>=</em>”)
command.</p>
</body>
</html>
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