html(3tcl)
NAME
html - Procedures to generate HTML structures
SYNOPSIS
package require Tcl 8.2 package require html ?1.4.4? ::html::author author ::html::bodyTag args ::html::cell param value ?tag? ::html::checkbox name value ::html::checkSet key sep list ::html::checkValue name ?value? ::html::closeTag ::html::default key ?param? ::html::description description ::html::end ::html::eval arg ?args? ::html::extractParam param key ?varName? ::html::font args ::html::for start test next body ::html::foreach varlist1 list1 ?varlist2 list2 ...? body ::html::formValue name ?defvalue? ::html::getFormInfo args ::html::getTitle ::html::h level string ?param? ::html::h1 string ?param? ::html::h2 string ?param? ::html::h3 string ?param? ::html::h4 string ?param? ::html::h5 string ?param? ::html::h6 string ?param? ::html::hdrRow args ::html::head title ::html::headTag string ::html::html_entities string ::html::if expr1 body1 ?elseif expr2 body2 ...? ?else bodyN? ::html::init ?list? ::html::keywords args ::html::mailto email ?subject? ::html::meta args ::html::css href ::html::css-clear ::html::js href ::html::js-clear ::html::minorList list ?ordered? ::html::minorMenu list ?sep? ::html::nl2br string ::html::openTag tag ?param? ::html::paramRow list ?rparam? ?cparam? ::html::passwordInput ?name? ::html::passwordInputRow label ?name? ::html::quoteFormValue value ::html::radioSet key sep list ::html::radioValue name value ::html::refresh seconds url ::html::row args ::html::select name param choices ?current? ::html::selectPlain name param choices ?current? ::html::set var val ::html::submit label ?name? ::html::tableFromArray arrname ?param? ?pat? ::html::tableFromList querylist ?param? ::html::textarea name ?param? ?current? ::html::textInput name value args ::html::textInputRow label name value args ::html::varEmpty name ::html::while test body ::html::doctype id ______________________________________________________________________________
DESCRIPTION
The package html provides commands that generate HTML. These commands
typically return an HTML string as their result. In particular, they do
not output their result to stdout.
The command ::html::init should be called early to initialize the
module. You can also use this procedure to define default values for
HTML tag parameters.
::html::author author
Side effect only. Call this before ::html::head to define an
author for the page. The author is noted in a comment in the
HEAD section.
::html::bodyTag args
Generate a body tag. The tag parameters are taken from args or
from the body.* attributes define with ::html::init.
::html::cell param value ?tag?
Generate a td (or th) tag, a value, and a closing td (or th)
tag. The tag parameters come from param or TD.* attributes
defined with ::html::init. This uses ::html::font to insert a
standard font tag into the table cell. The tag argument defaults
to "td".
::html::checkbox name value
Generate a checkbox form element with the specified name and
value. This uses ::html::checkValue.
::html::checkSet key sep list
Generate a set of checkbox form elements and associated labels.
The list should contain an alternating list of labels and
values. This uses ::html::checkbox. All the checkbox buttons
share the same key for their name. The sep is text used to
separate the elements.
::html::checkValue name ?value?
Generate the "name=name value=value" for a checkbox form
element. If the CGI variable name has the value value, then
SELECTED is added to the return value. value defaults to "1".
::html::closeTag
Pop a tag off the stack created by ::html::openTag and generate
the corresponding close tag (e.g., </body>).
::html::default key ?param?
This procedure is used by ::html::tagParam to generate the name,
value list of parameters for a tag. The ::html::default
procedure is used to generate default values for those items not
already in param. If the value identified by key matches a
value in param then this procedure returns the empty string.
Otherwise, it returns a "parameter=value" string for a form
element identified by key. The key has the form "tag.parameter"
(e.g., body.bgcolor). Use ::html::init to register default
values. param defaults to the empty string.
::html::description description
Side effect only. Call this before ::html::head to define a
description meta tag for the page. This tag is generated later
in the call to ::html::head.
::html::end
Pop all open tags from the stack and generate the corresponding
close HTML tags, (e.g., </body></html>).
::html::eval arg ?args?
This procedure is similar to the built-in Tcl eval command. The
only difference is that it returns "" so it can be called from
an HTML template file without appending unwanted results.
::html::extractParam param key ?varName?
This is a parsing procedure that extracts the value of key from
param, which is a HTML-style "name=quotedvalue" list. varName
is used as the name of a Tcl variable that is changed to have
the value found in the parameters. The function returns 1 if
the parameter was found in param, otherwise it returns 0. If
the varName is not specified, then key is used as the variable
name.
::html::font args
Generate a standard font tag. The parameters to the tag are
taken from args and the HTML defaults defined with ::html::init.
::html::for start test next body
This procedure is similar to the built-in Tcl for control
structure. Rather than evaluating the body, it returns the
subst'ed body. Each iteration of the loop causes another string
to be concatenated to the result value.
::html::foreach varlist1 list1 ?varlist2 list2 ...? body
This procedure is similar to the built-in Tcl foreach control
structure. Rather than evaluating the body, it returns the
subst'ed body. Each iteration of the loop causes another string
to be concatenated to the result value.
::html::formValue name ?defvalue?
Return a name and value pair, where the value is initialized
from existing CGI data, if any. The result has this form:
name="fred" value="freds value"
::html::getFormInfo args
Generate hidden fields to capture form values. If args is
empty, then hidden fields are generated for all CGI values.
Otherwise args is a list of string match patterns for form
element names.
::html::getTitle
Return the title string, with out the surrounding title tag, set
with a previous call to ::html::title.
::html::h level string ?param?
Generate a heading (e.g., hlevel) tag. The string is nested in
the heading, and param is used for the tag parameters.
::html::h1 string ?param?
Generate an h1 tag. See ::html::h.
::html::h2 string ?param?
Generate an h2 tag. See ::html::h.
::html::h3 string ?param?
Generate an h3 tag. See ::html::h.
::html::h4 string ?param?
Generate an h4 tag. See ::html::h.
::html::h5 string ?param?
Generate an h5 tag. See ::html::h.
::html::h6 string ?param?
Generate an h6 tag. See ::html::h.
::html::hdrRow args
Generate a table row, including tr and th tags. Each value in
args is place into its own table cell. This uses ::html::cell.
::html::head title
Generate the head section that includes the page title. If
previous calls have been made to ::html::author,
::html::keywords, ::html::description, or ::html::meta then
additional tags are inserted into the head section. This leaves
an open html tag pushed on the stack with ::html::openTag.
::html::headTag string
Save a tag for inclusion in the head section generated by
::html::head. The string is everything in the tag except the
enclosing angle brackets, < >.
::html::html_entities string
This command replaces all special characters in the string with
their HTML entities and returns the modified text.
::html::if expr1 body1 ?elseif expr2 body2 ...? ?else bodyN?
This procedure is similar to the built-in Tcl if control
structure. Rather than evaluating the body of the branch that
is taken, it returns the subst'ed body. Note that the syntax is
slightly more restrictive than that of the built-in Tcl if
control structure.
::html::init ?list?
::html::init accepts a Tcl-style name-value list that defines
values for items with a name of the form "tag.parameter". For
example, a default with key "body.bgcolor" defines the
background color for the body tag.
::html::keywords args
Side effect only. Call this before ::html::head to define a
keyword meta tag for the page. The meta tag is included in the
result of ::html::head.
::html::mailto email ?subject?
Generate a hypertext link to a mailto: URL.
::html::meta args
Side effect only. Call this before ::html::head to define a
meta tag for the page. The args is a Tcl-style name, value list
that is used for the name= and value= parameters for the meta
tag. The meta tag is included in the result of ::html::head.
::html::css href
Side effect only. Call this before ::html::head to define a
link tag for a linked CSS document. The href value is a HTTP
URL to a CSS document. The link tag is included in the result of
::html::head.
Multiple calls of this command are allowed, enabling the use of
multiple CSS document references. In other words, the arguments
of multiple calls are accumulated, and do not overwrite each
other.
::html::css-clear
Side effect only. Call this before ::html::head to clear all
links to CSS documents.
Multiple calls of this command are allowed, doing nothing after
the first of a sequence with no intervening ::html::css.
::html::js href
Side effect only. Call this before ::html::head to define a
script tag for a linked JavaScript document. The href is a HTTP
URL to a JavaScript document. The script tag is included in the
result of ::html::head.
Multiple calls of this command are allowed, enabling the use of
multiple JavaScript document references. In other words, the
arguments of multiple calls are accumulated, and do not
overwrite each other.
::html::js-clear
Side effect only. Call this before ::html::head to clear all
links to JavaScript documents.
Multiple calls of this command are allowed, doing nothing after
the first of a sequence with no intervening ::html::js.
::html::minorList list ?ordered?
Generate an ordered or unordered list of links. The list is a
Tcl-style name, value list of labels and urls for the links.
ordered is a boolean used to choose between an ordered or
unordered list. It defaults to false.
::html::minorMenu list ?sep?
Generate a series of hypertext links. The list is a Tcl-style
name, value list of labels and urls for the links. The sep is
the text to put between each link. It defaults to " | ".
::html::nl2br string
This command replaces all line-endings in the string with a br
tag and returns the modified text.
::html::openTag tag ?param?
Push tag onto a stack and generate the opening tag for tag. Use
::html::closeTag to pop the tag from the stack. The second
argument provides any tag arguments, as a list whose elements
are formatted to be in the form "key=value".
::html::paramRow list ?rparam? ?cparam?
Generate a table row, including tr and td tags. Each value in
list is placed into its own table cell. This uses ::html::cell.
The value of rparam is used as parameter for the tr tag. The
value of cparam is passed to ::html::cell as parameter for the
td tags.
::html::passwordInput ?name?
Generate an input tag of type password. The name defaults to
"password".
::html::passwordInputRow label ?name?
Format a table row containing a label and an input tag of type
password. The name defaults to "password".
::html::quoteFormValue value
Quote special characters in value by replacing them with HTML
entities for quotes, ampersand, and angle brackets.
::html::radioSet key sep list
Generate a set of input tags of type radio and an associated
text label. All the radio buttons share the same key for their
name. The sep is text used to separate the elements. The list
is a Tcl-style label, value list.
::html::radioValue name value
Generate the "name=name value=value" for a radio form element.
If the CGI variable name has the value value, then SELECTED is
added to the return value.
::html::refresh seconds url
Set up a refresh meta tag. Call this before ::html::head and the
HEAD section will contain a meta tag that causes the document to
refresh in seconds seconds. The url is optional. If specified,
it specifies a new page to load after the refresh interval.
::html::row args
Generate a table row, including tr and td tags. Each value in
args is place into its own table cell. This uses ::html::cell.
Ignores any default information set up via ::html::init.
::html::select name param choices ?current?
Generate a select form element and nested option tags. The name
and param are used to generate the select tag. The choices list
is a Tcl-style name, value list.
::html::selectPlain name param choices ?current?
Like ::html::select except that choices is a Tcl list of values
used for the option tags. The label and the value for each
option are the same.
::html::set var val
This procedure is similar to the built-in Tcl set command. The
main difference is that it returns "" so it can be called from
an HTML template file without appending unwanted results. The
other difference is that it must take two arguments.
::html::submit label ?name?
Generate an input tag of type submit. name defaults to "submit".
::html::tableFromArray arrname ?param? ?pat?
Generate a two-column table and nested rows to display a Tcl
array. The table gets a heading that matches the array name, and
each generated row contains a name, value pair. The array names
are sorted (lsort without special options). The argument param
is for the table tag and has to contain a pre-formatted string.
The pat is a string match pattern used to select the array
elements to show in the table. It defaults to *, i.e. the whole
array is shown.
::html::tableFromList querylist ?param?
Generate a two-column table and nested rows to display
querylist, which is a Tcl dictionary. Each generated row
contains a name, value pair. The information is shown in the
same order as specified in the dictionary. The argument param is
for the table tag and has to contain a pre-formatted string.
::html::textarea name ?param? ?current?
Generate a textarea tag wrapped around its current values.
::html::textInput name value args
Generate an input form tag with type text. This uses
::html::formValue. The args is any additional tag attributes
you want to put into the input tag.
::html::textInputRow label name value args
Generate an input form tag with type text formatted into a table
row with an associated label. The args is any additional tag
attributes you want to put into the input tag.
::html::varEmpty name
This returns 1 if the named variable either does not exist or
has the empty string for its value.
::html::while test body
This procedure is similar to the built-in Tcl while control
structure. Rather than evaluating the body, it returns the
subst'ed body. Each iteration of the loop causes another string
to be concatenated to the result value.
::html::doctype id
This procedure can be used to build the standard DOCTYPE
declaration string. It will return the standard declaration
string for the id, or throw an error if the id is not known.
The following id's are defined:
[1] HTML32
[2] HTML40
[3] HTML40T
[4] HTML40F
[5] HTML401
[6] HTML401T
[7] HTML401F
[8] XHTML10S
[9] XHTML10T
[10] XHTML10F
[11] XHTML11
[12] XHTMLB
BUGS, IDEAS, FEEDBACK
This document, and the package it describes, will undoubtedly contain bugs and other problems. Please report such in the category html of the Tcllib Trackers [http://core.tcl.tk/tcllib/reportlist]. Please also report any ideas for enhancements you may have for either package and/or documentation.
SEE ALSO
htmlparse, ncgi
KEYWORDS
checkbox, checkbutton, form, html, radiobutton, table
CATEGORY
CGI programming
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