package HTML::FillInForm;
use integer; # no floating point math so far!
use strict; # and no funny business, either.
use Carp; # generate better errors with more context
# required for attr_encoded
use HTML::Parser 3.26;
# required for UNIVERSAL->can
require 5.005;
use vars qw($VERSION @ISA);
$VERSION = '2.00';
@ISA = qw(HTML::Parser);
sub new {
my ($class) = @_;
my $self = bless {}, $class;
$self->init;
# tell HTML::Parser not to decode attributes
$self->attr_encoded(1);
return $self;
}
# a few shortcuts to fill()
sub fill_file { my $self = shift; return $self->fill('file' ,@_); }
sub fill_arrayref { my $self = shift; return $self->fill('arrayref' ,@_); }
sub fill_scalarref { my $self = shift; return $self->fill('scalarref',@_); }
# track the keys we support. Useful for file-name detection.
sub _known_keys {
return {
scalarref => 1,
arrayref => 1,
fdat => 1,
fobject => 1,
file => 1,
target => 1,
fill_password => 1,
ignore_fields => 1,
disable_fields => 1,
}
}
sub fill {
my $self = shift;
# If we are called as a class method, go ahead and call new().
$self = $self->new if (not ref $self);
my %option;
# If the first arg is a scalarref, translate that to scalarref => $first_arg
if (ref $_[0] eq 'SCALAR') {
$option{scalarref} = shift;
}
elsif (ref $_[0] eq 'ARRAY') {
$option{arrayref} = shift;
}
elsif (ref $_[0] eq 'GLOB') {
$option{file} = shift;
}
elsif (ref $_[0]) {
croak "data source is not a reference type we understand";
}
# Last chance, if the first arg isn't one of the known keys, we
# assume it is a file name.
elsif (not _known_keys()->{$_[0]} ) {
$option{file} = shift;
}
else {
# Should be a known key. Nothing to do.
}
# Now, check to see if the next arg is also a reference.
my $data;
if (ref $_[0]) {
$data = shift;
$data = [$data] unless ref $data eq 'ARRAY';
for my $source (@$data) {
if (ref $source eq 'HASH') {
push @{ $option{fdat} }, $source;
}
elsif (ref $source) {
if ($source->can('param')) {
push @{ $option{fobject} }, $source;
}
else {
croak "data source $source does not supply a param method";
}
}
elsif (defined $source) {
croak "data source $source is not a hash or object reference";
}
}
}
# load in the rest of the options
%option = (%option, @_);
# As suggested in the docs, merge multiple fdats into one.
if (ref $option{fdat} eq 'ARRAY') {
my %merged;
for my $hash (@{ $option{fdat} }) {
for my $key (keys %$hash) {
$merged{$key} = $hash->{$key};
}
}
$option{'fdat'} = \%merged;
}
my %ignore_fields;
%ignore_fields = map { $_ => 1 } ( ref $option{'ignore_fields'} eq 'ARRAY' )
? @{ $option{ignore_fields} } : $option{ignore_fields} if exists( $option{ignore_fields} );
$self->{ignore_fields} = \%ignore_fields;
my %disable_fields;
%disable_fields = map { $_ => 1 } ( ref $option{'disable_fields'} eq 'ARRAY' )
? @{ $option{disable_fields} } : $option{disable_fields} if exists( $option{disable_fields} );
$self->{disable_fields} = \%disable_fields;
if (my $fdat = $option{fdat}){
# Copy the structure to prevent side-effects.
my %copy;
keys %$fdat; # reset fdat if each or Dumper was called on fdat
while(my($key, $val) = each %$fdat) {
next if exists $ignore_fields{$key};
$copy{ $key } = ref $val eq 'ARRAY' ? [ @$val ] : $val;
}
$self->{fdat} = \%copy;
}
# We want the reference to these objects to go out of scope at the
# end of the method.
local $self->{objects} = [];
if(my $objects = $option{fobject}){
unless(ref($objects) eq 'ARRAY'){
$objects = [ $objects ];
}
for my $object (@$objects){
# make sure objects in 'param_object' parameter support param()
defined($object->can('param')) or
croak("HTML::FillInForm->fill called with fobject option, containing object of type " . ref($object) . " which lacks a param() method!");
}
$self->{objects} = $objects;
}
if (my $target = $option{target}){
$self->{'target'} = $target;
}
if (defined($option{fill_password})){
$self->{fill_password} = $option{fill_password};
} else {
$self->{fill_password} = 1;
}
# make sure method has data to fill in HTML form with!
unless(exists $self->{fdat} || $self->{objects}){
croak("HTML::FillInForm->fillInForm() called without 'fobject' or 'fdat' parameter set");
}
local $self->{object_param_cache};
if(my $file = $option{file}){
$self->parse_file($file);
} elsif (my $scalarref = $option{scalarref}){
$self->parse($$scalarref);
} elsif (my $arrayref = $option{arrayref}){
for (@$arrayref){
$self->parse($_);
}
}
$self->eof;
return delete $self->{output};
}
# handles opening HTML tags such as <input ...>
sub start {
my ($self, $tagname, $attr, $attrseq, $origtext) = @_;
# set the current form
if ($tagname eq 'form') {
$self->{object_param_cache} = {};
if (exists $attr->{'name'} || exists $attr->{'id'}) {
$self->{'current_form'} = $attr->{'name'} || $attr->{'id'};
} else {
# in case of previous one without </FORM>
delete $self->{'current_form'};
}
}
# This form is not my target.
if (exists $self->{'target'} &&
(! exists $self->{'current_form'} ||
$self->{'current_form'} ne $self->{'target'})) {
$self->{'output'} .= $origtext;
return;
}
# HTML::Parser converts tagname to lowercase, so we don't need /i
if ($self->{option_no_value}) {
$self->{output} .= '>';
delete $self->{option_no_value};
}
# Check if we need to disable this field
$attr->{disable} = 1
if exists $attr->{'name'} and
exists $self->{disable_fields}{ $attr->{'name'} } and
$self->{disable_fields}{ $attr->{'name'} } and
not ( exists $attr->{disable} and $attr->{disable} );
if ($tagname eq 'input'){
my $value = exists $attr->{'name'} ? $self->_get_param($attr->{'name'}) : undef;
# force hidden fields to have a value
$value = '' if exists($attr->{'type'}) && $attr->{'type'} eq 'hidden' && ! exists $attr->{'value'} && ! defined $value;
if (defined($value)){
$value = $self->escapeHTMLStringOrList($value);
# check for input type, noting that default type is text
if (!exists $attr->{'type'} ||
$attr->{'type'} =~ /^(text|textfield|hidden|)$/i){
if ( ref($value) eq 'ARRAY' ) {
$value = shift @$value;
$value = '' unless defined $value;
}
$attr->{'value'} = $value;
} elsif (lc $attr->{'type'} eq 'password' && $self->{fill_password}) {
if ( ref($value) eq 'ARRAY' ) {
$value = shift @$value;
$value = '' unless defined $value;
}
$attr->{'value'} = $value;
} elsif (lc $attr->{'type'} eq 'radio'){
if ( ref($value) eq 'ARRAY' ) {
$value = $value->[0];
$value = '' unless defined $value;
}
# value for radio boxes default to 'on', works with netscape
$attr->{'value'} = 'on' unless exists $attr->{'value'};
if ($attr->{'value'} eq $value){
$attr->{'checked'} = 'checked';
} else {
delete $attr->{'checked'};
}
} elsif (lc $attr->{'type'} eq 'checkbox'){
# value for checkboxes default to 'on', works with netscape
$attr->{'value'} = 'on' unless exists $attr->{'value'};
delete $attr->{'checked'}; # Everything is unchecked to start
$value = [ $value ] unless ref($value) eq 'ARRAY';
foreach my $v ( @$value ) {
if ( $attr->{'value'} eq $v ) {
$attr->{'checked'} = 'checked';
}
}
# } else {
# warn(qq(Input field of unknown type "$attr->{type}": $origtext));
}
}
$self->{output} .= "<$tagname";
while (my ($key, $value) = each %$attr) {
next if $key eq '/';
$self->{output} .= sprintf qq( %s="%s"), $key, $value;
}
# extra space put here to work around Opera 6.01/6.02 bug
$self->{output} .= ' /' if $attr->{'/'};
$self->{output} .= ">";
} elsif ($tagname eq 'option'){
my $value = $self->_get_param($self->{selectName});
$value = [ $value ] unless ( ref($value) eq 'ARRAY' );
if ( defined $value->[0] ){
$value = $self->escapeHTMLStringOrList($value);
delete $attr->{selected} if exists $attr->{selected};
if(defined($attr->{'value'})){
# option tag has value attr - <OPTION VALUE="foo">bar</OPTION>
if ($self->{selectMultiple}){
# check if the option tag belongs to a multiple option select
foreach my $v ( grep { defined } @$value ) {
if ( $attr->{'value'} eq $v ){
$attr->{selected} = 'selected';
}
}
} else {
# if not every value of a fdat ARRAY belongs to a different select tag
if (not $self->{selectSelected}){
if ( $attr->{'value'} eq $value->[0]){
shift @$value if ref($value) eq 'ARRAY';
$attr->{selected} = 'selected';
$self->{selectSelected} = 1; # remeber that an option tag is selected for this select tag
}
}
}
} else {
# option tag has no value attr - <OPTION>bar</OPTION>
# save for processing under text handler
$self->{option_no_value} = $value;
}
}
$self->{output} .= "<$tagname";
while (my ($key, $value) = each %$attr) {
$self->{output} .= sprintf qq( %s="%s"), $key, $value;
}
unless ($self->{option_no_value}){
# we can close option tag here
$self->{output} .= ">";
}
} elsif ($tagname eq 'textarea'){
if ($attr->{'name'} and defined (my $value = $self->_get_param($attr->{'name'}))){
$value = $self->escapeHTMLStringOrList($value);
$value = (shift @$value || '') if ref($value) eq 'ARRAY';
# <textarea> foobar </textarea> -> <textarea> $value </textarea>
# we need to set outputText to 'no' so that 'foobar' won't be printed
$self->{outputText} = 'no';
$self->{output} .= $origtext . $value;
} else {
$self->{output} .= $origtext;
}
} elsif ($tagname eq 'select'){
$self->{selectName} = $attr->{'name'};
if (defined $attr->{'multiple'}){
$self->{selectMultiple} = 1; # helper var to remember if the select tag has the multiple attr set or not
} else {
$self->{selectMultiple} = 0;
$self->{selectSelected} = 0; # helper var to remember if an option was already selected in the current select tag
}
$self->{output} .= $origtext;
} else {
$self->{output} .= $origtext;
}
}
sub _get_param {
my ($self, $param) = @_;
return undef if $self->{ignore_fields}{$param};
return $self->{fdat}{$param} if exists $self->{fdat}{$param};
return $self->{object_param_cache}{$param} if exists $self->{object_param_cache}{$param};
# traverse the list in reverse order for backwards compatibility
# with the previous implementation.
for my $o (reverse @{$self->{objects}}) {
my @v = $o->param($param);
next unless @v;
return $self->{object_param_cache}{$param} = @v > 1 ? \@v : $v[0];
}
return undef;
}
# handles non-html text
sub text {
my ($self, $origtext) = @_;
# just output text, unless replaced value of <textarea> tag
unless(exists $self->{outputText} && $self->{outputText} eq 'no'){
if(exists $self->{option_no_value}){
# dealing with option tag with no value - <OPTION>bar</OPTION>
my $values = $self->{option_no_value};
my $value = $origtext;
$value =~ s/^\s+//;
$value =~ s/\s+$//;
foreach my $v ( @$values ) {
if ( $value eq $v ) {
$self->{output} .= ' selected="selected"';
}
}
# close <OPTION> tag
$self->{output} .= ">$origtext";
delete $self->{option_no_value};
} else {
$self->{output} .= $origtext;
}
}
}
# handles closing HTML tags such as </textarea>
sub end {
my ($self, $tagname, $origtext) = @_;
if ($self->{option_no_value}) {
$self->{output} .= '>';
delete $self->{option_no_value};
}
if($tagname eq 'select'){
delete $self->{selectName};
} elsif ($tagname eq 'textarea'){
delete $self->{outputText};
} elsif ($tagname eq 'form') {
delete $self->{'current_form'};
}
$self->{output} .= $origtext;
}
sub escapeHTMLStringOrList {
my ($self, $toencode) = @_;
if (ref($toencode) eq 'ARRAY') {
foreach my $elem (@$toencode) {
$elem = $self->escapeHTML($elem);
}
return $toencode;
} else {
return $self->escapeHTML($toencode);
}
}
sub escapeHTML {
my ($self, $toencode) = @_;
return undef unless defined($toencode);
$toencode =~ s/&/&/g;
$toencode =~ s/\"/"/g;
$toencode =~ s/>/>/g;
$toencode =~ s/</</g;
return $toencode;
}
sub comment {
my ( $self, $text ) = @_;
# if it begins with '[if ' and doesn't end with '<![endif]'
# it's a "downlevel-revealed" conditional comment (stupid IE)
# or
# if it ends with '[endif]' then it's the end of a
# "downlevel-revealed" conditional comment
if(
(
( index($text, '[if ') == 0 )
&&
( $text !~ /<!\[endif\]$/ )
)
||
( $text eq '[endif]' )
) {
$self->{output} .= '<!' . $text . '>';
} else {
$self->{output} .= '<!--' . $text . '-->';
}
}
sub process {
my ( $self, $token0, $text ) = @_;
$self->{output} .= $text;
}
sub declaration {
my ( $self, $text ) = @_;
$self->{output} .= '<!' . $text . '>';
}
1;
__END__
=head1 NAME
HTML::FillInForm - Populates HTML Forms with data.
=head1 DESCRIPTION
This module fills in an HTML form with data from a Perl data structure, allowing you
to keep the HTML and Perl separate.
Here are two common use cases:
1. A user submits an HTML form without filling out a required field. You want
to redisplay the form with all the previous data in it, to make it easy for the
user to see and correct the error.
2. You have just retrieved a record from a database and need to display it in
an HTML form.
=head1 SYNOPSIS
Fill HTML form with data.
$output = HTML::FillInForm->fill( \$html, $q );
$output = HTML::FillInForm->fill( \@html, [$q1,$q2] );
$output = HTML::FillInForm->fill( \*HTML, \%data );
$output = HTML::FillInForm->fill( 't.html', [\%data1,%data2] );
The HTML can be provided as a scalarref, arrayref, filehandle or file. The data can come from one or more
hashrefs, or objects which support a param() method, like CGI.pm, L<Apache::Request|Apache::Request>, etc.
=head1 fill
The basic syntax is seen above the Synopsis. There are a few additional options.
=head2 Options
=head3 target => 'form1'
Suppose you have multiple forms in a html file and only want to fill in one.
$output = HTML::FillInForm->fill(\$html, $q, target => 'form1');
This will fill in only the form inside
<FORM name="form1"> ... </FORM>
=head3 fill_password => 0
Passwords are filled in by default. To disable:
fill_password => 0
=head3 ignore_fields => []
To disable the filling of some fields:
ignore_fields => ['prev','next']
=head3 disable_fields => []
To disable fields from being edited:
disable_fields => [ 'uid', 'gid' ]
=head2 File Upload fields
File upload fields cannot be supported directly. Workarounds include asking the
user to re-attach any file uploads or fancy server-side storage and
referencing. You are on your own.
=head2 Clearing Fields
Fields are cleared if you set their value to an empty string or empty arrayref but not undef:
# this will leave the form element foo untouched
HTML::FillInForm->fill(\$html, { foo => undef });
# this will set clear the form element foo
HTML::FillInForm->fill(\$html, { foo => "" });
It has been suggested to add a option to change the behavior so that undef
values will clear the form elements. Patches welcome.
=head1 Old syntax
You probably need to read no further. The remaining docs concern the
1.x era syntax, which is still supported.
=head2 new
Call C<new()> to create a new FillInForm object:
$fif = HTML::FillInForm->new;
$fif->fill(...);
In theory, there is a slight performance benefit to calling C<new()> before C<fill()> if you make multiple
calls to C<fill()> before you destroy the object. Benchmark before optimizing.
=head2 fill ( old syntax )
Instead of having your HTML and data types auto-detected, you can declare them explicitly in your
call to C<fill()>:
HTML source options:
arrayref => @html
scalarref => $html
file => \*HTML
file => 't.html'
Fill Data options:
fobject => $data_obj # with param() method
fdat => \%data
Additional methods are also available:
fill_file(\*HTML,...);
fill_file('t.html',...);
fill_arrayref(\@html,...);
fill_scalarref(\$html,...);
=head1 CALLING FROM OTHER MODULES
=head2 Apache::PageKit
To use HTML::FillInForm in L<Apache::PageKit> is easy. It is
automatically called for any page that includes a <form> tag.
It can be turned on or off by using the C<fill_in_form> configuration
option.
=head2 Apache::ASP v2.09 and above
HTML::FillInForm is now integrated with Apache::ASP. To activate, use
PerlSetVar FormFill 1
$Response->{FormFill} = 1
=head2 HTML::Mason
Using HTML::FillInForm from HTML::Mason is covered in the FAQ on
the masonhq.com website at
L<http://www.masonhq.com/?FAQ:HTTPAndHTML#h-how_can_i_populate_form_values_automatically_>
=head1 VERSION
This documentation describes HTML::FillInForm module version 2.00
=head1 SECURITY
Note that you might want to think about caching issues if you have password
fields on your page. There is a discussion of this issue at
http://www.perlmonks.org/index.pl?node_id=70482
In summary, some browsers will cache the output of CGI scripts, and you
can control this by setting the Expires header. For example, use
C<-expires> in L<CGI.pm> or set C<browser_cache> to I<no> in
Config.xml file of L<Apache::PageKit>.
=head1 TRANSLATION
Kato Atsushi has translated these docs into Japanese, available from
http://perldoc.jp
=head1 BUGS
Please submit any bug reports to tjmather@maxmind.com.
=head1 NOTES
Requires Perl 5.005 and L<HTML::Parser> version 3.26.
I wrote this module because I wanted to be able to insert CGI data
into HTML forms,
but without combining the HTML and Perl code. CGI.pm and Embperl allow you so
insert CGI data into forms, but require that you mix HTML with Perl.
There is a nice review of the module available here:
L<http://www.perlmonks.org/index.pl?node_id=274534>
=head1 AUTHOR
(c) 2005 TJ Mather, tjmather@maxmind.com, L<http://www.maxmind.com/>
All rights reserved. This package is free software; you can
redistribute it and/or modify it under the same terms as Perl itself.
=head1 SEE ALSO
L<HTML::Parser|HTML::Parser>,
L<Data::FormValidator|Data::FormValidato>,
L<HTML::Template|HTML::Template>,
L<Apache::PageKit|Apache::PageKit>
=head1 CREDITS
Fixes, Bug Reports, Docs have been generously provided by:
Tatsuhiko Miyagawa Joseph Yanni
Boris Zentner Philip Mak
Dave Rolsky Jost Krieger
Patrick Michael Kane Gabriel Burka
Ade Olonoh Bill Moseley
Tom Lancaster James Tolley
Martin H Sluka Dan Kubb
Mark Stosberg Alexander Hartmaier
Jonathan Swartz Paul Miller
Trevor Schellhorn Anthony Ettinger
Jim Miner Simon P. Ditner
Paul Lindner Michael Peters
Maurice Aubrey Trevor Schellhorn
Andrew Creer
Thanks!