user_selector_base Class Reference

Base class for user selectors. More...

Inheritance diagram for user_selector_base:

Public Member Functions
	__construct ($name, $options=array())
	Constructor.
	clear_exclusions ()
	Clear the list of excluded user ids.
	display ($return=false)
	Output this user_selector as HTML.
	exclude ($arrayofuserids)
	All to the list of user ids that this control will not select.
	find_users ($search)
	Search the database for users matching the $search string, and any other conditions that apply.
	get_exclusions ()
	Returns the list of user ids that this control will not select.
	get_name ()
	Returns the id/name of this control.
	get_rows ()
	Returns the number of rows to display in this control.
	get_selected_user ()
	Convenience method for when multiselect is false (throws an exception if not).
	get_selected_users ()
	The users that were selected.
	invalidate_selected_users ()
	Invalidates the list of selected users.
	is_multiselect ()
	Returns true is multiselect should be allowed.
	output_user ($user)
	Convert a user object to a string suitable for displaying as an option in the list box.
	set_extra_fields ($fields)
	Set the user fields that are displayed in the selector in addition to the user's name.
	set_multiselect ($multiselect)
	Whether this control will allow selection of many, or just one user.
	set_rows ($numrows)
	The height this control will be displayed, in rows.

Public Attributes
int	$maxusersperpage = 100
	this is used to define maximum number of users visible in list
boolean	$viewfullnames = false
	Whether to override fullname()

Protected Member Functions
	get_options ()
	Note: this function must be implemented if you use the search ajax field (e.g.
	initialise_javascript ($search)
	Initialises JS for this control.
	is_validating ()
	Returns true if this control is validating a list of users.
	load_selected_users ()
	Get the list of users that were selected by doing optional_param then validating the result.
	output_optgroup ($groupname, $users, $select)
	Output one particular optgroup.
	output_options ($groupedusers, $search)
	Output the list of <optgroup>s and <options>s that go inside the select.
	required_fields_sql (string $u)
	Returns SQL to select required fields.
	search_button_caption ()
	Returns the string to use for the search button caption.
	search_sql (string $search, string $u)
	Returns an array with SQL to perform a search and the params that go into it.
	too_many_results ($search, $count)
	Used to generate a nice message when there are too many users to show.

Protected Attributes
object	$accesscontext
	Context used for capability checks regarding this selector (does not necessarily restrict user list)
boolean	$autoselectunique = false
	If only one user matches the search, should we select them automatically.
array	$exclude = array()
	A list of userids that should not be returned by this control.
array	$extrafields
	Extra fields to search on and return in addition to firstname and lastname.
boolean	$includecustomfields = false
	Whether to include custom user profile fields.
boolean	$multiselect = true
	Whether the conrol should allow selection of many users, or just one.
string	$name
	The control name (and id) in the HTML.
boolean	$preserveselected = false
	When the search changes, do we keep previously selected options that do not match the new search term?
int	$rows = USER_SELECTOR_DEFAULT_ROWS
	The height this control should have, in rows.
int	$searchtype = USER_SEARCH_STARTS_WITH
	When searching, do we only match the starts of fields (better performance) or do we match occurrences anywhere or do we match exact the fields.
array null	$selected = null
	A list of the users who are selected.
string	$userfieldsjoin = ''
	User fields join for custom fields.
array	$userfieldsmappings = []
	User fields mappings for custom fields.
array	$userfieldsparams = []
	User fields params for custom fields.
string	$userfieldsselects = ''
	User fields selects for custom fields.
mixed	$validatinguserids = null
	This is used by get selected users.

Static Protected Attributes
static array	$jsmodule
	JavaScript YUI3 Module definition.

Detailed Description

Base class for user selectors.

In your theme, you must give each user-selector a defined width. If the user selector has name="myid", then the div myid_wrapper must have a width specified.

Copyright

1999 onwards Martin Dougiamas http://dougiamas.com

License

http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later

Constructor & Destructor Documentation

__construct()

user_selector_base::__construct	(		$name,
			$options = array() )

Constructor.

Each subclass must have a constructor with this signature.

Parameters

string	$name	the control name/id for use in the HTML.
array	$options	other options needed to construct this selector. You must be able to clone a userselector by doing new get_class($us)($us->get_name(), $us->get_options());

Reimplemented in cohort_candidate_selector, cohort_existing_selector, core_role_admins_existing_selector, core_role_admins_potential_selector, core_role_assign_user_selector_base, core_role_check_users_selector, enrol_manual_current_participant, enrol_manual_potential_participant, groups_user_selector_base, mnetservice_enrol_existing_users_selector, mnetservice_enrol_potential_users_selector, mod_forum_potential_subscriber_selector, mod_forum_subscriber_selector_base, and service_user_selector.

Member Function Documentation

display()

user_selector_base::display

(

$return = false

)

Output this user_selector as HTML.

Parameters

boolean

$return

if true, return the HTML as a string instead of outputting it.

Return values

mixed

if $return is true, returns the HTML as a string, otherwise returns nothing.

exclude()

user_selector_base::exclude

(

$arrayofuserids

)

All to the list of user ids that this control will not select.

For example, on the role assign page, we do not list the users who already have the role in question.

Parameters

array

$arrayofuserids

the user ids to exclude.

find_users()

user_selector_base::find_users ( $search )

abstract

Search the database for users matching the $search string, and any other conditions that apply.

The SQL for testing whether a user matches the search string should be obtained by calling the search_sql method.

This method is used both when getting the list of choices to display to the user, and also when validating a list of users that was selected.

When preparing a list of users to choose from ($this->is_validating() return false) you should probably have an maximum number of users you will return, and if more users than this match your search, you should instead return a message generated by the too_many_results() method. However, you should not do this when validating.

If you are writing a new user_selector subclass, I strongly recommend you look at some of the subclasses later in this file and in admin/roles/lib.php. They should help you see exactly what you have to do.

Parameters

string

$search

the search string.

Return values

array

An array of arrays of users. The array keys of the outer array should be the string names of optgroups. The keys of the inner arrays should be userids, and the values should be user objects containing at least the list of fields returned by the method required_fields_sql(). If a user object has a ->disabled property that is true, then that option will be displayed greyed out, and will not be returned by get_selected_users.

Reimplemented in badge_existing_users_selector, badge_potential_users_selector, cohort_candidate_selector, cohort_existing_selector, core_role_admins_existing_selector, core_role_admins_potential_selector, core_role_check_users_selector, core_role_existing_role_holders, core_role_potential_assignees_below_course, core_role_potential_assignees_course_and_above, enrol_manual_current_participant, enrol_manual_potential_participant, group_members_selector, group_non_members_selector, mnetservice_enrol_existing_users_selector, mnetservice_enrol_potential_users_selector, mod_forum_existing_subscriber_selector, mod_forum_potential_subscriber_selector, and service_user_selector.

get_exclusions()

user_selector_base::get_exclusions

(

)

Returns the list of user ids that this control will not select.

Return values

array

the list of user ids that this control will not select.

get_name()

user_selector_base::get_name

(

)

Returns the id/name of this control.

Return values

string

the id/name that this control will have in the HTML.

get_options()

user_selector_base::get_options ( )

protected

Note: this function must be implemented if you use the search ajax field (e.g.

set $options['file'] = '/admin/filecontainingyourclass.php';)

Return values

array

the options needed to recreate this user_selector.

Reimplemented in badge_award_selector_base, cohort_candidate_selector, cohort_existing_selector, core_role_admins_existing_selector, core_role_admins_potential_selector, core_role_assign_user_selector_base, core_role_check_users_selector, enrol_manual_current_participant, enrol_manual_potential_participant, groups_user_selector_base, mnetservice_enrol_existing_users_selector, mnetservice_enrol_potential_users_selector, mod_forum_potential_subscriber_selector, mod_forum_subscriber_selector_base, and service_user_selector.

get_rows()

user_selector_base::get_rows

(

)

Returns the number of rows to display in this control.

Return values

integer

the height this control will be displayed, in rows.

get_selected_user()

user_selector_base::get_selected_user

(

)

Convenience method for when multiselect is false (throws an exception if not).

Exceptions

moodle_exception

Return values

object

the selected user object, or null if none.

get_selected_users()

user_selector_base::get_selected_users

(

)

The users that were selected.

This is a more sophisticated version of optional_param($this->name, array(), PARAM_INT) that validates the returned list of ids against the rules for this user selector.

Return values

array

of user objects.

initialise_javascript()

user_selector_base::initialise_javascript ( $search )

protected

Initialises JS for this control.

Parameters

string

$search

Return values

string

any HTML needed here.

invalidate_selected_users()

user_selector_base::invalidate_selected_users

(

)

Invalidates the list of selected users.

If you update the database in such a way that it is likely to change the list of users that this component is allowed to select from, then you must call this method. For example, on the role assign page, after you have assigned some roles to some users, you should call this.

is_multiselect()

user_selector_base::is_multiselect

(

)

Returns true is multiselect should be allowed.

Return values

boolean

whether this control will allow selection of more than one user.

is_validating()

user_selector_base::is_validating ( )

protected

Returns true if this control is validating a list of users.

Return values

boolean

if true, we are validating a list of selected users, rather than preparing a list of uesrs to choose from.

load_selected_users()

user_selector_base::load_selected_users ( )

protected

Get the list of users that were selected by doing optional_param then validating the result.

Return values

array

of user objects.

output_optgroup()

user_selector_base::output_optgroup ( $groupname, $users, $select )

protected

Output one particular optgroup.

Used by the preceding function output_options.

Parameters

string	$groupname	the label for this optgroup.
array	$users	the users to put in this optgroup.
boolean	$select	if true, select the users in this group.

Return values

string

HTML code.

output_options()

user_selector_base::output_options ( $groupedusers, $search )

protected

Output the list of <optgroup>s and <options>s that go inside the select.

This method should do the same as the JavaScript method user_selector.prototype.handle_response.

Parameters

array	$groupedusers	an array, as returned by find_users.
string	$search

Return values

string

HTML code.

output_user()

user_selector_base::output_user

(

$user

)

Convert a user object to a string suitable for displaying as an option in the list box.

Parameters

object

$user

the user to display.

Return values

string

a string representation of the user.

Reimplemented in group_non_members_selector.

required_fields_sql()

user_selector_base::required_fields_sql ( string $u )

protected

Returns SQL to select required fields.

Parameters

string

$u

the table alias for the user table in the query being built. May be ''.

Return values

string

fragment of SQL to go in the select list of the query.

Exceptions

coding_exception

if used when includecustomfields is true

search_button_caption()

user_selector_base::search_button_caption ( )

protected

Returns the string to use for the search button caption.

Return values

string

the caption for the search button.

search_sql()

user_selector_base::search_sql ( string $search, string $u )

protected

Returns an array with SQL to perform a search and the params that go into it.

Parameters

string	$search	the text to search for.
string	$u	the table alias for the user table in the query being built. May be ''.

Return values

array

an array with two elements, a fragment of SQL to go in the where clause the query, and an array containing any required parameters. this uses ? style placeholders.

set_extra_fields()

user_selector_base::set_extra_fields

(

$fields

)

Set the user fields that are displayed in the selector in addition to the user's name.

Parameters

array

$fields

a list of field names that exist in the user table.

set_multiselect()

user_selector_base::set_multiselect

(

$multiselect

)

Whether this control will allow selection of many, or just one user.

Parameters

boolean

$multiselect

true = allow multiple selection.

set_rows()

user_selector_base::set_rows

(

$numrows

)

The height this control will be displayed, in rows.

Parameters

integer

$numrows

the desired height.

too_many_results()

user_selector_base::too_many_results ( $search, $count )

protected

Used to generate a nice message when there are too many users to show.

The message includes the number of users that currently match, and the text of the message depends on whether the search term is non-blank.

Parameters

string	$search	the search term, as passed in to the find users method.
int	$count	the number of users that currently match.

Return values

array

in the right format to return from the find_users method.

Member Data Documentation

$jsmodule

array user_selector_base::$jsmodule

staticprotected

Initial value:

= array(
                'name' => 'user_selector',
                'fullpath' => '/user/selector/module.js',
                'requires'  => array('node', 'event-custom', 'datasource', 'json', 'moodle-core-notification'),
                'strings' => array(
                    array('previouslyselectedusers', 'moodle', '%%SEARCHTERM%%'),
                    array('nomatchingusers', 'moodle', '%%SEARCHTERM%%'),
                    array('none', 'moodle')
                ))

JavaScript YUI3 Module definition.

---

The documentation for this class was generated from the following file:

• user/selector/lib.php