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html(n) HTML Generation html(n)
____________________________________________________________________________________________________________
NAME
html - Procedures to generate HTML structures
SYNOPSIS
package require Tcl 8.2
package require html ?1.4?
::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::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
____________________________________________________________________________________________________________
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 pro-cedure procedure
cedure 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 stan-dard standard
dard 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::check-Value. ::html::checkValue.
Value.
::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 vari-able variable
able 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 evaluat-ing evaluating
ing 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 gen-erated generated
erated 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 ta-ble table
ble 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 every-thing everything
thing 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 back-ground background
ground 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::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 ta-ble table
ble 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 but-tons buttons
tons 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 ta-ble table
ble 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.
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 SF Trackers [http://source -
forge.net/tracker/? group_id=12883]. 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
html 1.4 html(n)
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