Template::Plugin::TablUser Contributed Perl DocumentTemplate::Plugin::Table(3)NAMETemplate::Plugin::Table - Plugin to present data in a table
SYNOPSIS
[% USE table(list, rows=n, cols=n, overlap=n, pad=0) %]
[% FOREACH item IN table.row(n) %]
[% item %]
[% END %]
[% FOREACH item IN table.col(n) %]
[% item %]
[% END %]
[% FOREACH row IN table.rows %]
[% FOREACH item IN row %]
[% item %]
[% END %]
[% END %]
[% FOREACH col IN table.cols %]
[% col.first %] - [% col.last %] ([% col.size %] entries)
[% END %]
DESCRIPTION
The "Table" plugin allows you to format a list of data items into a
virtual table. When you create a "Table" plugin via the "USE"
directive, simply pass a list reference as the first parameter and then
specify a fixed number of rows or columns.
[% USE Table(list, rows=5) %]
[% USE table(list, cols=5) %]
The "Table" plugin name can also be specified in lower case as shown in
the second example above. You can also specify an alternative variable
name for the plugin as per regular Template Toolkit syntax.
[% USE mydata = table(list, rows=5) %]
The plugin then presents a table based view on the data set. The data
isn't actually reorganised in any way but is available via the "row()",
"col()", "rows()" and "cols()" as if formatted into a simple two
dimensional table of "n" rows x "n" columns.
So if we had a sample "alphabet" list contained the letters '"a"' to
'"z"', the above "USE" directives would create plugins that represented
the following views of the alphabet.
[% USE table(alphabet, ... %]
rows=5 cols=5
a f k p u z a g m s y
b g l q v b h n t z
c h m r w c i o u
d i n s x d j p v
e j o t y e k q w
f l r x
We can request a particular row or column using the "row()" and "col()"
methods.
[% USE table(alphabet, rows=5) %]
[% FOREACH item = table.row(0) %]
# [% item %] set to each of [ a f k p u z ] in turn
[% END %]
[% FOREACH item = table.col(2) %]
# [% item %] set to each of [ m n o p q r ] in turn
[% END %]
Data in rows is returned from left to right, columns from top to
bottom. The first row/column is 0. By default, rows or columns that
contain empty values will be padded with the undefined value to fill it
to the same size as all other rows or columns.
For example, the last row (row 4) in the first example would contain
the values "[ e j o t y undef ]". The Template Toolkit will safely
accept these undefined values and print a empty string. You can also
use the IF directive to test if the value is set.
[% FOREACH item = table.row(4) %]
[% IF item %]
Item: [% item %]
[% END %]
[% END %]
You can explicitly disable the "pad" option when creating the plugin to
returned shortened rows/columns where the data is empty.
[% USE table(alphabet, cols=5, pad=0) %]
[% FOREACH item = table.col(4) %]
# [% item %] set to each of 'y z'
[% END %]
The "rows()" method returns all rows/columns in the table as a
reference to a list of rows (themselves list references). The "row()"
methods when called without any arguments calls "rows()" to return all
rows in the table.
Ditto for "cols()" and "col()".
[% USE table(alphabet, cols=5) %]
[% FOREACH row = table.rows %]
[% FOREACH item = row %]
[% item %]
[% END %]
[% END %]
The Template Toolkit provides the "first", "last" and "size" virtual
methods that can be called on list references to return the first/last
entry or the number of entries in a list. The following example shows
how we might use this to provide an alphabetical index split into 3
even parts.
[% USE table(alphabet, cols=3, pad=0) %]
[% FOREACH group = table.col %]
[ [% group.first %] - [% group.last %] ([% group.size %] letters) ]
[% END %]
This produces the following output:
[ a - i (9 letters) ]
[ j - r (9 letters) ]
[ s - z (8 letters) ]
We can also use the general purpose "join" virtual method which joins
the items of the list using the connecting string specified.
[% USE table(alphabet, cols=5) %]
[% FOREACH row = table.rows %]
[% row.join(' - ') %]
[% END %]
Data in the table is ordered downwards rather than across but can
easily be transformed on output. For example, to format our data in 5
columns with data ordered across rather than down, we specify "rows=5"
to order the data as such:
a f . .
b g .
c h
d i
e j
and then iterate down through each column (a-e, f-j, etc.) printing the
data across.
a b c d e
f g h i j
. .
.
Example code to do so would be much like the following:
[% USE table(alphabet, rows=3) %]
[% FOREACH cols = table.cols %]
[% FOREACH item = cols %]
[% item %]
[% END %]
[% END %]
Output:
a b c
d e f
g h i
j . .
.
In addition to a list reference, the "Table" plugin constructor may be
passed a reference to a Template::Iterator object or subclass thereof.
The Template::Iterator get_all() method is first called on the iterator
to return all remaining items. These are then available via the usual
Table interface.
[% USE DBI(dsn,user,pass) -%]
# query() returns an iterator
[% results = DBI.query('SELECT * FROM alphabet ORDER BY letter') %]
# pass into Table plugin
[% USE table(results, rows=8 overlap=1 pad=0) -%]
[% FOREACH row = table.cols -%]
[% row.first.letter %] - [% row.last.letter %]:
[% row.join(', ') %]
[% END %]
AUTHOR
Andy Wardley <abw@wardley.org> <http://wardley.org/>
COPYRIGHT
Copyright (C) 1996-2007 Andy Wardley. All Rights Reserved.
This module is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
SEE ALSO
Template::Plugin
perl v5.14.3 2011-12-20 Template::Plugin::Table(3)
