html - Procedures to generate HTML structures
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.
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.
Generate a body tag. The tag parameters are taken from args or from the body.* attributes define with ::html::init.
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".
Generate a checkbox form element with the specified name and value. This uses ::html::checkValue.
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.
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".
Pop a tag off the stack created by ::html::openTag and generate the corresponding close tag (e.g., </body>).
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.
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.
Pop all open tags from the stack and generate the corresponding close HTML tags, (e.g., </body></html>).
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.
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.
Generate a standard font tag. The parameters to the tag are taken from args and the HTML defaults defined with ::html::init.
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.
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.
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"
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.
Return the title string, with out the surrounding title tag, set with a previous call to ::html::title.
Generate a heading (e.g., hlevel) tag. The string is nested in the heading, and param is used for the tag parameters.
Generate an h1 tag. See ::html::h.
Generate an h2 tag. See ::html::h.
Generate an h3 tag. See ::html::h.
Generate an h4 tag. See ::html::h.
Generate an h5 tag. See ::html::h.
Generate an h6 tag. See ::html::h.
Generate a table row, including tr and th tags. Each value in args is place into its own table cell. This uses ::html::cell.
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.
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, < >.
This command replaces all special characters in the string with their HTML entities and returns the modified text.
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 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.
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.
Generate a hypertext link to a mailto: URL.
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.
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.
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 " | ".
This command replaces all line-endings in the string with a br tag and returns the modified text.
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".
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.
Generate an input tag of type password. The name defaults to "password".
Format a table row containing a label and an input tag of type password. The name defaults to "password".
Quote special characters in value by replacing them with HTML entities for quotes, ampersand, and angle brackets.
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.
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.
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.
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.
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.
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.
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.
Generate an input tag of type submit. name defaults to "submit".
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.
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.
Generate a textarea tag wrapped around its current values.
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.
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.
This returns 1 if the named variable either does not exist or has the empty string for its value.
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.
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. Please also report any ideas for enhancements you may have for either package and/or documentation.
CGI programming