version 1.42, 2003/08/13 14:49:58
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version 1.45, 2003/09/05 16:15:54
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=pod |
=pod |
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=head1 lonhelper - HTML Helper framework for LON-CAPA |
=head1 NAME |
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Helpers, often known as "wizards", are well-established UI widgets that users |
lonhelper - implements helper framework |
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=head1 SYNOPSIS |
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lonhelper implements the helper framework for LON-CAPA, and provides |
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many generally useful components for that framework. |
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Helpers are little programs which present the user with a sequence of |
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simple choices, instead of one monolithic multi-dimensional |
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choice. They are also referred to as "wizards", "druids", and |
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other potentially trademarked or semantically-loaded words. |
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=head1 OVERVIEWX<lonhelper> |
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Helpers are well-established UI widgets that users |
feel comfortable with. It can take a complicated multidimensional problem the |
feel comfortable with. It can take a complicated multidimensional problem the |
user has and turn it into a series of bite-sized one-dimensional questions. |
user has and turn it into a series of bite-sized one-dimensional questions. |
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Line 46 directory and having the .helper file ex
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Line 60 directory and having the .helper file ex
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All classes are in the Apache::lonhelper namespace. |
All classes are in the Apache::lonhelper namespace. |
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=head2 lonhelper XML file format |
=head1 lonhelper XML file formatX<lonhelper, XML file format> |
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A helper consists of a top-level <helper> tag which contains a series of states. |
A helper consists of a top-level <helper> tag which contains a series of states. |
Each state contains one or more state elements, which are what the user sees, like |
Each state contains one or more state elements, which are what the user sees, like |
Line 87 Of course this does nothing. In order fo
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Line 101 Of course this does nothing. In order fo
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necessary to put actual elements into the wizard. Documentation for each |
necessary to put actual elements into the wizard. Documentation for each |
of these elements follows. |
of these elements follows. |
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=head2 Creating a Helper With Code, Not XML |
=head1 Creating a Helper With Code, Not XML |
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In some situations, such as the printing wizard (see lonprintout.pm), |
In some situations, such as the printing wizard (see lonprintout.pm), |
writing the helper in XML would be too complicated, because of scope |
writing the helper in XML would be too complicated, because of scope |
Line 146 Normally the machinery in the XML format
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Line 160 Normally the machinery in the XML format
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adding states can easily be done by wrapping the state in a <condition> |
adding states can easily be done by wrapping the state in a <condition> |
tag. This should only be used when the code dominates the XML content, |
tag. This should only be used when the code dominates the XML content, |
the code is so complicated that it is difficult to get access to |
the code is so complicated that it is difficult to get access to |
all of the information you need because of scoping issues, or so much |
all of the information you need because of scoping issues, or would-be <exec> or |
of the information used is persistent because would-be <exec> or |
<eval> blocks using the {DATA} mechanism results in hard-to-read |
<eval> blocks that using the {DATA} mechanism results in hard-to-read |
and -maintain code. (See course.initialization.helper for a borderline |
and -maintain code. |
case.) |
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It is possible to do some of the work with an XML fragment parsed by |
It is possible to do some of the work with an XML fragment parsed by |
lonxml; again, see lonprintout.pm for an example. In that case it is |
lonxml; again, see lonprintout.pm for an example. In that case it is |
Line 210 my $paramHash;
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Line 224 my $paramHash;
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# mod_perl connection. In this code, it was manifesting itself in the existence |
# mod_perl connection. In this code, it was manifesting itself in the existence |
# of two seperate file-scoped $helper variables, one set to the value of the |
# of two seperate file-scoped $helper variables, one set to the value of the |
# helper in the helper constructor, and one referenced by the handler on the |
# helper in the helper constructor, and one referenced by the handler on the |
# "$helper->process()" line. The second was therefore never set, and was still |
# "$helper->process()" line. Using the debugger, one could actually |
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# see the two different $helper variables, as hashes at completely |
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# different addresses. The second was therefore never set, and was still |
# undefined when I tried to call process on it. |
# undefined when I tried to call process on it. |
# By pushing the "real handler" down into the "real scope", everybody except the |
# By pushing the "real handler" down into the "real scope", everybody except the |
# actual handler function directly below this comment gets the same $helper and |
# actual handler function directly below this comment gets the same $helper and |
Line 748 package Apache::lonhelper::element;
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Line 764 package Apache::lonhelper::element;
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=pod |
=pod |
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=head2 Element Base Class |
=head1 Element Base Class |
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The Apache::lonhelper::element base class provides support for elements |
The Apache::lonhelper::element base class provides support for elements |
and defines some generally useful tags for use in elements. |
and defines some generally useful tags for use in elements. |
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B<finalcode tag> |
=head2 finalcode tagX<finalcode> |
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Each element can contain a "finalcode" tag that, when the special FINAL |
Each element can contain a "finalcode" tag that, when the special FINAL |
helper state is used, will be executed, surrounded by "sub { my $helper = shift;" |
helper state is used, will be executed, surrounded by "sub { my $helper = shift;" |
Line 762 may be an empty string. See course initi
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Line 778 may be an empty string. See course initi
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generally intended for helpers like the course initialization helper, which consist |
generally intended for helpers like the course initialization helper, which consist |
of several panels, each of which is performing some sort of bite-sized functionality. |
of several panels, each of which is performing some sort of bite-sized functionality. |
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B<defaultvalue tag> |
=head2 defaultvalue tagX<defaultvalue> |
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Each element that accepts user input can contain a "defaultvalue" tag that, |
Each element that accepts user input can contain a "defaultvalue" tag that, |
when surrounded by "sub { my $helper = shift; my $state = shift; " and "}", |
when surrounded by "sub { my $helper = shift; my $state = shift; " and "}", |
Line 779 some setting accidentally.
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Line 795 some setting accidentally.
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Again, see the course initialization helper for examples. |
Again, see the course initialization helper for examples. |
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B<validator tag> |
=head2 validator tagX<validator> |
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Some elements that accepts user input can contain a "validator" tag that, |
Some elements that accepts user input can contain a "validator" tag that, |
when surrounded by "sub { my $helper = shift; my $state = shift; my $element = shift; my $val = shift " |
when surrounded by "sub { my $helper = shift; my $state = shift; my $element = shift; my $val = shift " |
Line 791 will return an error message to be displ
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Line 807 will return an error message to be displ
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Consult the documentation for each element to see whether it supports this |
Consult the documentation for each element to see whether it supports this |
tag. |
tag. |
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B<getValue method> |
=head2 getValue methodX<getValue (helper elements)> |
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If the element stores the name of the variable in a 'variable' member, which |
If the element stores the name of the variable in a 'variable' member, which |
the provided ones all do, you can retreive the value of the variable by calling |
the provided ones all do, you can retreive the value of the variable by calling |
Line 910 package Apache::lonhelper::message;
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Line 926 package Apache::lonhelper::message;
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=pod |
=pod |
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=head2 Element: message |
=head1 Element: messageX<message, helper element> |
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Message elements display the contents of their <message_text> tags, and |
Message elements display their contents, and |
transition directly to the state in the <nextstate> tag. Example: |
transition directly to the state in the <nextstate> attribute. Example: |
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<message> |
<message nextstate='GET_NAME'> |
<nextstate>GET_NAME</nextstate> |
This is the <b>message</b> the user will see, |
<message_text>This is the <b>message</b> the user will see, |
<i>HTML allowed</i>. |
<i>HTML allowed</i>.</message_text> |
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</message> |
</message> |
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This will display the HTML message and transition to the <nextstate> if |
This will display the HTML message and transition to the 'nextstate' if |
given. The HTML will be directly inserted into the helper, so if you don't |
given. The HTML will be directly inserted into the helper, so if you don't |
want text to run together, you'll need to manually wrap the <message_text> |
want text to run together, you'll need to manually wrap the message text |
in <p> tags, or whatever is appropriate for your HTML. |
in <p> tags, or whatever is appropriate for your HTML. |
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Message tags do not add in whitespace, so if you want it, you'll need to add |
Message tags do not add in whitespace, so if you want it, you'll need to add |
Line 998 package Apache::lonhelper::choices;
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Line 1013 package Apache::lonhelper::choices;
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=pod |
=pod |
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=head2 Element: choices |
=head2 Element: choicesX<choices, helper element> |
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Choice states provide a single choice to the user as a text selection box. |
Choice states provide a single choice to the user as a text selection box. |
A "choice" is two pieces of text, one which will be displayed to the user |
A "choice" is two pieces of text, one which will be displayed to the user |
Line 1016 value, will allow the user to select mul
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Line 1031 value, will allow the user to select mul
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value, will allow the user to select none of the choices without raising |
value, will allow the user to select none of the choices without raising |
an error message. |
an error message. |
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B<SUB-TAGS> |
=head3 SUB-TAGS |
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<choices> can have the following subtags: |
<choices> can have the following subtags:X<choice, helper tag> |
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=over 4 |
=over 4 |
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=item * <nextstate>state_name</nextstate>: If given, this will cause the |
=item * <nextstate>state_name</nextstate>: If given, this will cause the |
choice element to transition to the given state after executing. If |
choice element to transition to the given state after executing. |
this is used, do not pass nextstates to the <choice> tag. |
This will override the <nextstate> passed to <choices> (if any). |
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=item * <choice />: If the choices are static, |
=item * <choice />: If the choices are static, |
this element will allow you to specify them. Each choice |
this element will allow you to specify them. Each choice |
Line 1033 B<SUB-TAGS>
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Line 1048 B<SUB-TAGS>
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For example, |
For example, |
<choice computer='234-12-7312'>Bobby McDormik</choice>. |
<choice computer='234-12-7312'>Bobby McDormik</choice>. |
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<choice> can take a parameter "eval", which if set to |
<choice> can take a parameter "eval", which if set to |
a true value, will cause the contents of the tag to be |
a true value, will cause the contents of the tag to be |
evaluated as it would be in an <eval> tag; see <eval> tag |
evaluated as it would be in an <eval> tag; see <eval> tag |
below. |
below. |
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<choice> may optionally contain a 'nextstate' attribute, which |
<choice> may optionally contain a 'nextstate' attribute, which |
will be the state transisitoned to if the choice is made, if |
will be the state transistioned to if the choice is made, if |
the choice is not multichoice. |
the choice is not multichoice. This will override the nextstate |
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passed to the parent C<choices> tag. |
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=back |
=back |
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Line 1065 You can mix and match methods of creatin
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Line 1081 You can mix and match methods of creatin
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"push" onto the choice list, rather then wiping it out. (You can even |
"push" onto the choice list, rather then wiping it out. (You can even |
remove choices programmatically, but that would probably be bad form.) |
remove choices programmatically, but that would probably be bad form.) |
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B<defaultvalue support> |
=head3 defaultvalue support |
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Choices supports default values both in multichoice and single choice mode. |
Choices supports default values both in multichoice and single choice mode. |
In single choice mode, have the defaultvalue tag's function return the |
In single choice mode, have the defaultvalue tag's function return the |
Line 1278 package Apache::lonhelper::dropdown;
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Line 1294 package Apache::lonhelper::dropdown;
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=pod |
=pod |
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=head2 Element: dropdown |
=head2 Element: dropdownX<dropdown, helper tag> |
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A drop-down provides a drop-down box instead of a radio button |
A drop-down provides a drop-down box instead of a radio button |
box. Because most people do not know how to use a multi-select |
box. Because most people do not know how to use a multi-select |
Line 1288 are the same as "choices", except "allow
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Line 1304 are the same as "choices", except "allow
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<dropdown> takes an attribute "variable" to control which helper variable |
<dropdown> takes an attribute "variable" to control which helper variable |
the result is stored in. |
the result is stored in. |
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B<SUB-TAGS> |
=head3 SUB-TAGS |
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<choice>, which acts just as it does in the "choices" element. |
<choice>, which acts just as it does in the "choices" element. |
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=back |
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=cut |
=cut |
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no strict; |
no strict; |
Line 1390 sub render {
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Line 1404 sub render {
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} |
} |
$result .= ">" . $choiceLabel . "\n"; |
$result .= ">" . $choiceLabel . "\n"; |
} |
} |
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$result .= "</select>\n"; |
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return $result; |
return $result; |
} |
} |
Line 1425 package Apache::lonhelper::date;
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Line 1440 package Apache::lonhelper::date;
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=pod |
=pod |
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=head2 Element: date |
=head2 Element: dateX<date, helper element> |
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Date elements allow the selection of a date with a drop down list. |
Date elements allow the selection of a date with a drop down list. |
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Line 1635 package Apache::lonhelper::resource;
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Line 1650 package Apache::lonhelper::resource;
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=pod |
=pod |
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=head2 Element: resource |
=head2 Element: resourceX<resource, helper element> |
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<resource> elements allow the user to select one or multiple resources |
<resource> elements allow the user to select one or multiple resources |
from the current course. You can filter out which resources they can view, |
from the current course. You can filter out which resources they can view, |
Line 1645 selections across folder openings and cl
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Line 1660 selections across folder openings and cl
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the user can manipulate the folders. |
the user can manipulate the folders. |
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<resource> takes the standard variable attribute to control what helper |
<resource> takes the standard variable attribute to control what helper |
variable stores the results. It also takes a "multichoice" attribute, |
variable stores the results. It also takes a "multichoice"X<multichoice> attribute, |
which controls whether the user can select more then one resource. The |
which controls whether the user can select more then one resource. The |
"toponly" attribute controls whether the resource display shows just the |
"toponly" attribute controls whether the resource display shows just the |
resources in that sequence, or recurses into all sub-sequences, defaulting |
resources in that sequence, or recurses into all sub-sequences, defaulting |
Line 1654 suppressEmptySequences argument to the r
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Line 1669 suppressEmptySequences argument to the r
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folders that have all of their contained resources filtered out to also |
folders that have all of their contained resources filtered out to also |
be filtered out. |
be filtered out. |
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B<SUB-TAGS> |
=head3 SUB-TAGS |
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=over 4 |
=over 4 |
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=item * <filterfunc>: If you want to filter what resources are displayed |
=item * <filterfunc>X<filterfunc>: If you want to filter what resources are displayed |
to the user, use a filter func. The <filterfunc> tag should contain |
to the user, use a filter func. The <filterfunc> tag should contain |
Perl code that when wrapped with "sub { my $res = shift; " and "}" is |
Perl code that when wrapped with "sub { my $res = shift; " and "}" is |
a function that returns true if the resource should be displayed, |
a function that returns true if the resource should be displayed, |
Line 1666 B<SUB-TAGS>
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Line 1681 B<SUB-TAGS>
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(See Apache::lonnavmaps documentation for information about the |
(See Apache::lonnavmaps documentation for information about the |
resource object.) |
resource object.) |
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=item * <choicefunc>: Same as <filterfunc>, except that controls whether |
=item * <choicefunc>X<choicefunc>: Same as <filterfunc>, except that controls whether |
the given resource can be chosen. (It is almost always a good idea to |
the given resource can be chosen. (It is almost always a good idea to |
show the user the folders, for instance, but you do not always want to |
show the user the folders, for instance, but you do not always want to |
let the user select them.) |
let the user select them.) |
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=item * <nextstate>: Standard nextstate behavior. |
=item * <nextstate>: Standard nextstate behavior. |
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=item * <valuefunc>: This function controls what is returned by the resource |
=item * <valuefunc>X<valuefunc>: This function controls what is returned by the resource |
when the user selects it. Like filterfunc and choicefunc, it should be |
when the user selects it. Like filterfunc and choicefunc, it should be |
a function fragment that when wrapped by "sub { my $res = shift; " and |
a function fragment that when wrapped by "sub { my $res = shift; " and |
"}" returns a string representing what you want to have as the value. By |
"}" returns a string representing what you want to have as the value. By |
default, the value will be the resource ID of the object ($res->{ID}). |
default, the value will be the resource ID of the object ($res->{ID}). |
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=item * <mapurl>: If the URL of a map is given here, only that map |
=item * <mapurl>X<mapurl>: If the URL of a map is given here, only that map |
will be displayed, instead of the whole course. |
will be displayed, instead of the whole course. |
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=back |
=back |
Line 1916 package Apache::lonhelper::student;
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Line 1931 package Apache::lonhelper::student;
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=pod |
=pod |
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=head2 Element: student |
=head2 Element: studentX<student, helper element> |
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Student elements display a choice of students enrolled in the current |
Student elements display a choice of students enrolled in the current |
course. Currently it is primitive; this is expected to evolve later. |
course. Currently it is primitive; this is expected to evolve later. |
Line 2101 package Apache::lonhelper::files;
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Line 2116 package Apache::lonhelper::files;
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=pod |
=pod |
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=head2 Element: files |
=head2 Element: filesX<files, helper element> |
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files allows the users to choose files from a given directory on the |
files allows the users to choose files from a given directory on the |
server. It is always multichoice and stores the result as a triple-pipe |
server. It is always multichoice and stores the result as a triple-pipe |
Line 2117 are put. It accepts the attribute "multi
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Line 2132 are put. It accepts the attribute "multi
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defaulting to false, which if true will allow the user to select more |
defaulting to false, which if true will allow the user to select more |
then one choice. |
then one choice. |
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<files> accepts three subtags. One is the "nextstate" sub-tag that works |
<files> accepts three subtags: |
as it does with the other tags. Another is a <filechoice> sub tag that |
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is Perl code that, when surrounded by "sub {" and "}" will return a |
=over 4 |
string representing what directory on the server to allow the user to |
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choose files from. Finally, the <filefilter> subtag should contain Perl |
=item * B<nextstate>: works as it does with the other tags. |
code that when surrounded by "sub { my $filename = shift; " and "}", |
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returns a true value if the user can pick that file, or false otherwise. |
=item * B<filechoice>: When the contents of this tag are surrounded by |
The filename passed to the function will be just the name of the file, |
"sub {" and "}", will return a string representing what directory |
with no path info. |
on the server to allow the user to choose files from. |
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=item * B<filefilter>: Should contain Perl code that when surrounded |
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by "sub { my $filename = shift; " and "}", returns a true value if |
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the user can pick that file, or false otherwise. The filename |
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passed to the function will be just the name of the file, with no |
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path info. By default, a filter function will be used that will |
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mask out old versions of files. This function is available as |
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Apache::lonhelper::files::not_old_version if you want to use it to |
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composite your own filters. |
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=back |
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B<General security note>: You should ensure the user can not somehow |
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pass something into your code that would allow them to look places |
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they should not be able to see, like the C</etc/> directory. However, |
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the security impact would be minimal, since it would only expose |
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the existence of files, there should be no way to parlay that into |
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viewing the files. |
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=cut |
=cut |
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Line 2140 BEGIN {
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Line 2173 BEGIN {
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('files', 'filechoice', 'filefilter')); |
('files', 'filechoice', 'filefilter')); |
} |
} |
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sub not_old_version { |
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my $file = shift; |
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# Given a file name, return false if it is an "old version" of a |
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# file, or true if it is not. |
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if ($file =~ /^.*\.[0-9]+\.[A-Za-z]+(\.meta)?$/) { |
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return 0; |
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} |
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return 1; |
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} |
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sub new { |
sub new { |
my $ref = Apache::lonhelper::element->new(); |
my $ref = Apache::lonhelper::element->new(); |
bless($ref); |
bless($ref); |
Line 2207 sub render {
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Line 2252 sub render {
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my $subdir = &$subdirFunc(); |
my $subdir = &$subdirFunc(); |
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my $filterFunc = $self->{FILTER_FUNC}; |
my $filterFunc = $self->{FILTER_FUNC}; |
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if (!defined($filterFunc)) { |
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$filterFunc = ¬_old_version; |
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} |
my $buttons = ''; |
my $buttons = ''; |
my $type = 'radio'; |
my $type = 'radio'; |
if ($self->{'multichoice'}) { |
if ($self->{'multichoice'}) { |
Line 2263 BUTTONS
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Line 2311 BUTTONS
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@fileList = &Apache::lonnet::dirlist($subdir, $ENV{'user.domain'}, $ENV{'user.name'}, ''); |
@fileList = &Apache::lonnet::dirlist($subdir, $ENV{'user.domain'}, $ENV{'user.name'}, ''); |
} |
} |
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# Sort the fileList into order |
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@fileList = sort @fileList; |
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$result .= $buttons; |
$result .= $buttons; |
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if (defined $self->{ERROR_MSG}) { |
if (defined $self->{ERROR_MSG}) { |
Line 2391 package Apache::lonhelper::section;
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Line 2442 package Apache::lonhelper::section;
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=pod |
=pod |
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=head2 Element: section |
=head2 Element: sectionX<section, helper element> |
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<section> allows the user to choose one or more sections from the current |
<section> allows the user to choose one or more sections from the current |
course. |
course. |
Line 2465 package Apache::lonhelper::string;
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Line 2516 package Apache::lonhelper::string;
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=pod |
=pod |
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=head2 Element: string |
=head2 Element: stringX<string, helper element> |
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string elements provide a string entry field for the user. string elements |
string elements provide a string entry field for the user. string elements |
take the usual 'variable' and 'nextstate' parameters. string elements |
take the usual 'variable' and 'nextstate' parameters. string elements |
Line 2574 package Apache::lonhelper::general;
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Line 2625 package Apache::lonhelper::general;
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=pod |
=pod |
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=head2 General-purpose tag: <exec> |
=head2 General-purpose tag: <exec>X<exec, helper tag> |
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The contents of the exec tag are executed as Perl code, not inside a |
The contents of the exec tag are executed as Perl code, B<not> inside a |
safe space, so the full range of $ENV and such is available. The code |
safe space, so the full range of $ENV and such is available. The code |
will be executed as a subroutine wrapped with the following code: |
will be executed as a subroutine wrapped with the following code: |
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Line 2589 The return value is ignored.
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Line 2640 The return value is ignored.
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$helper is the helper object. Feel free to add methods to the helper |
$helper is the helper object. Feel free to add methods to the helper |
object to support whatever manipulation you may need to do (for instance, |
object to support whatever manipulation you may need to do (for instance, |
overriding the form location if the state is the final state; see |
overriding the form location if the state is the final state; see |
lonparm.helper for an example). |
parameter.helper for an example). |
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$state is the $paramHash that has currently been generated and may |
$state is the $paramHash that has currently been generated and may |
be manipulated by the code in exec. Note that the $state is not yet |
be manipulated by the code in exec. Note that the $state is not yet |
Line 2664 sub end_clause { return ''; }
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Line 2715 sub end_clause { return ''; }
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=pod |
=pod |
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=head2 General-purpose tag: <eval> |
=head2 General-purpose tag: <eval>X<eval, helper tag> |
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The <eval> tag will be evaluated as a subroutine call passed in the |
The <eval> tag will be evaluated as a subroutine call passed in the |
current helper object and state hash as described in <condition> above, |
current helper object and state hash as described in <condition> above, |
Line 2707 package Apache::lonhelper::final;
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Line 2758 package Apache::lonhelper::final;
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=pod |
=pod |
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=head2 Element: final |
=head2 Element: finalX<final, helper tag> |
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<final> is a special element that works with helpers that use the <finalcode> |
<final> is a special element that works with helpers that use the <finalcode> |
tag. It goes through all the states and elements, executing the <finalcode> |
tagX<finalcode, helper tag>. It goes through all the states and elements, executing the <finalcode> |
snippets and collecting the results. Finally, it takes the user out of the |
snippets and collecting the results. Finally, it takes the user out of the |
helper, going to a provided page. |
helper, going to a provided page. |
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Line 2816 sub render {
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Line 2867 sub render {
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} |
} |
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if ($self->{'restartCourse'}) { |
if ($self->{'restartCourse'}) { |
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my $targetURL = '/adm/menu'; |
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if ($ENV{'course.'.$ENV{'request.course.id'}.'.clonedfrom'}) { |
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$targetURL = '/adm/parmset?overview=1'; |
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} |
$result .= "<center>\n" . |
$result .= "<center>\n" . |
"<form action='/adm/roles' method='post' target='loncapaclient'>\n" . |
"<form action='/adm/roles' method='post' target='loncapaclient'>\n" . |
"<input type='button' onclick='history.go(-1)' value='<- Previous' />" . |
"<input type='button' onclick='history.go(-1)' value='<- Previous' />" . |
"<input type='hidden' name='orgurl' value='/adm/menu' />" . |
"<input type='hidden' name='orgurl' value='$targetURL' />" . |
"<input type='hidden' name='selectrole' value='1' />\n" . |
"<input type='hidden' name='selectrole' value='1' />\n" . |
"<input type='hidden' name='" . $ENV{'request.role'} . |
"<input type='hidden' name='" . $ENV{'request.role'} . |
"' value='1' />\n<input type='submit' value='Finish Course Initialization' />\n" . |
"' value='1' />\n<input type='submit' value='Finish Course Initialization' />\n" . |