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tablelib.php
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tablelib.php
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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* @package core
* @subpackage lib
* @copyright 1999 onwards Martin Dougiamas {@link http://moodle.com}
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
defined('MOODLE_INTERNAL') || die();
/**#@+
* These constants relate to the table's handling of URL parameters.
*/
define('TABLE_VAR_SORT', 1);
define('TABLE_VAR_HIDE', 2);
define('TABLE_VAR_SHOW', 3);
define('TABLE_VAR_IFIRST', 4);
define('TABLE_VAR_ILAST', 5);
define('TABLE_VAR_PAGE', 6);
define('TABLE_VAR_RESET', 7);
define('TABLE_VAR_DIR', 8);
/**#@-*/
/**#@+
* Constants that indicate whether the paging bar for the table
* appears above or below the table.
*/
define('TABLE_P_TOP', 1);
define('TABLE_P_BOTTOM', 2);
/**#@-*/
use core_table\local\filter\filterset;
/**
* @package moodlecore
* @copyright 1999 onwards Martin Dougiamas {@link http://moodle.com}
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class flexible_table {
var $uniqueid = NULL;
var $attributes = array();
var $headers = array();
/**
* @var string A column which should be considered as a header column.
*/
protected $headercolumn = null;
/**
* @var string For create header with help icon.
*/
private $helpforheaders = array();
var $columns = array();
var $column_style = array();
var $column_class = array();
var $column_suppress = array();
var $column_nosort = array('userpic');
private $column_textsort = array();
/** @var boolean Stores if setup has already been called on this flixible table. */
var $setup = false;
var $baseurl = NULL;
var $request = array();
/**
* @var bool Whether or not to store table properties in the user_preferences table.
*/
private $persistent = false;
var $is_collapsible = false;
var $is_sortable = false;
/**
* @var string The field name to sort by.
*/
protected $sortby;
/**
* @var string $sortorder The direction for sorting.
*/
protected $sortorder;
/** @var string The manually set first name initial preference */
protected $ifirst;
/** @var string The manually set last name initial preference */
protected $ilast;
var $use_pages = false;
var $use_initials = false;
var $maxsortkeys = 2;
var $pagesize = 30;
var $currpage = 0;
var $totalrows = 0;
var $currentrow = 0;
var $sort_default_column = NULL;
var $sort_default_order = SORT_ASC;
/**
* Array of positions in which to display download controls.
*/
var $showdownloadbuttonsat= array(TABLE_P_TOP);
/**
* @var string Key of field returned by db query that is the id field of the
* user table or equivalent.
*/
public $useridfield = 'id';
/**
* @var string which download plugin to use. Default '' means none - print
* html table with paging. Property set by is_downloading which typically
* passes in cleaned data from $
*/
var $download = '';
/**
* @var bool whether data is downloadable from table. Determines whether
* to display download buttons. Set by method downloadable().
*/
var $downloadable = false;
/**
* @var bool Has start output been called yet?
*/
var $started_output = false;
var $exportclass = null;
/**
* @var array For storing user-customised table properties in the user_preferences db table.
*/
private $prefs = array();
/** @var $sheettitle */
protected $sheettitle;
/** @var $filename */
protected $filename;
/** @var array $hiddencolumns List of hidden columns. */
protected $hiddencolumns;
/**
* @var filterset The currently applied filerset
* This is required for dynamic tables, but can be used by other tables too if desired.
*/
protected $filterset = null;
/**
* Constructor
* @param string $uniqueid all tables have to have a unique id, this is used
* as a key when storing table properties like sort order in the session.
*/
function __construct($uniqueid) {
$this->uniqueid = $uniqueid;
$this->request = array(
TABLE_VAR_SORT => 'tsort',
TABLE_VAR_HIDE => 'thide',
TABLE_VAR_SHOW => 'tshow',
TABLE_VAR_IFIRST => 'tifirst',
TABLE_VAR_ILAST => 'tilast',
TABLE_VAR_PAGE => 'page',
TABLE_VAR_RESET => 'treset',
TABLE_VAR_DIR => 'tdir',
);
}
/**
* Call this to pass the download type. Use :
* $download = optional_param('download', '', PARAM_ALPHA);
* To get the download type. We assume that if you call this function with
* params that this table's data is downloadable, so we call is_downloadable
* for you (even if the param is '', which means no download this time.
* Also you can call this method with no params to get the current set
* download type.
* @param string $download dataformat type. One of csv, xhtml, ods, etc
* @param string $filename filename for downloads without file extension.
* @param string $sheettitle title for downloaded data.
* @return string download dataformat type. One of csv, xhtml, ods, etc
*/
function is_downloading($download = null, $filename='', $sheettitle='') {
if ($download!==null) {
$this->sheettitle = $sheettitle;
$this->is_downloadable(true);
$this->download = $download;
$this->filename = clean_filename($filename);
$this->export_class_instance();
}
return $this->download;
}
/**
* Get, and optionally set, the export class.
* @param $exportclass (optional) if passed, set the table to use this export class.
* @return table_default_export_format_parent the export class in use (after any set).
*/
function export_class_instance($exportclass = null) {
if (!is_null($exportclass)) {
$this->started_output = true;
$this->exportclass = $exportclass;
$this->exportclass->table = $this;
} else if (is_null($this->exportclass) && !empty($this->download)) {
$this->exportclass = new table_dataformat_export_format($this, $this->download);
if (!$this->exportclass->document_started()) {
$this->exportclass->start_document($this->filename, $this->sheettitle);
}
}
return $this->exportclass;
}
/**
* Probably don't need to call this directly. Calling is_downloading with a
* param automatically sets table as downloadable.
*
* @param bool $downloadable optional param to set whether data from
* table is downloadable. If ommitted this function can be used to get
* current state of table.
* @return bool whether table data is set to be downloadable.
*/
function is_downloadable($downloadable = null) {
if ($downloadable !== null) {
$this->downloadable = $downloadable;
}
return $this->downloadable;
}
/**
* Call with boolean true to store table layout changes in the user_preferences table.
* Note: user_preferences.value has a maximum length of 1333 characters.
* Call with no parameter to get current state of table persistence.
*
* @param bool $persistent Optional parameter to set table layout persistence.
* @return bool Whether or not the table layout preferences will persist.
*/
public function is_persistent($persistent = null) {
if ($persistent == true) {
$this->persistent = true;
}
return $this->persistent;
}
/**
* Where to show download buttons.
* @param array $showat array of postions in which to show download buttons.
* Containing TABLE_P_TOP and/or TABLE_P_BOTTOM
*/
function show_download_buttons_at($showat) {
$this->showdownloadbuttonsat = $showat;
}
/**
* Sets the is_sortable variable to the given boolean, sort_default_column to
* the given string, and the sort_default_order to the given integer.
* @param bool $bool
* @param string $defaultcolumn
* @param int $defaultorder
* @return void
*/
function sortable($bool, $defaultcolumn = NULL, $defaultorder = SORT_ASC) {
$this->is_sortable = $bool;
$this->sort_default_column = $defaultcolumn;
$this->sort_default_order = $defaultorder;
}
/**
* Use text sorting functions for this column (required for text columns with Oracle).
* Be warned that you cannot use this with column aliases. You can only do this
* with real columns. See MDL-40481 for an example.
* @param string column name
*/
function text_sorting($column) {
$this->column_textsort[] = $column;
}
/**
* Do not sort using this column
* @param string column name
*/
function no_sorting($column) {
$this->column_nosort[] = $column;
}
/**
* Is the column sortable?
* @param string column name, null means table
* @return bool
*/
function is_sortable($column = null) {
if (empty($column)) {
return $this->is_sortable;
}
if (!$this->is_sortable) {
return false;
}
return !in_array($column, $this->column_nosort);
}
/**
* Sets the is_collapsible variable to the given boolean.
* @param bool $bool
* @return void
*/
function collapsible($bool) {
$this->is_collapsible = $bool;
}
/**
* Sets the use_pages variable to the given boolean.
* @param bool $bool
* @return void
*/
function pageable($bool) {
$this->use_pages = $bool;
}
/**
* Sets the use_initials variable to the given boolean.
* @param bool $bool
* @return void
*/
function initialbars($bool) {
$this->use_initials = $bool;
}
/**
* Sets the pagesize variable to the given integer, the totalrows variable
* to the given integer, and the use_pages variable to true.
* @param int $perpage
* @param int $total
* @return void
*/
function pagesize($perpage, $total) {
$this->pagesize = $perpage;
$this->totalrows = $total;
$this->use_pages = true;
}
/**
* Assigns each given variable in the array to the corresponding index
* in the request class variable.
* @param array $variables
* @return void
*/
function set_control_variables($variables) {
foreach ($variables as $what => $variable) {
if (isset($this->request[$what])) {
$this->request[$what] = $variable;
}
}
}
/**
* Gives the given $value to the $attribute index of $this->attributes.
* @param string $attribute
* @param mixed $value
* @return void
*/
function set_attribute($attribute, $value) {
$this->attributes[$attribute] = $value;
}
/**
* What this method does is set the column so that if the same data appears in
* consecutive rows, then it is not repeated.
*
* For example, in the quiz overview report, the fullname column is set to be suppressed, so
* that when one student has made multiple attempts, their name is only printed in the row
* for their first attempt.
* @param int $column the index of a column.
*/
function column_suppress($column) {
if (isset($this->column_suppress[$column])) {
$this->column_suppress[$column] = true;
}
}
/**
* Sets the given $column index to the given $classname in $this->column_class.
* @param int $column
* @param string $classname
* @return void
*/
function column_class($column, $classname) {
if (isset($this->column_class[$column])) {
$this->column_class[$column] = ' '.$classname; // This space needed so that classnames don't run together in the HTML
}
}
/**
* Sets the given $column index and $property index to the given $value in $this->column_style.
* @param int $column
* @param string $property
* @param mixed $value
* @return void
*/
function column_style($column, $property, $value) {
if (isset($this->column_style[$column])) {
$this->column_style[$column][$property] = $value;
}
}
/**
* Sets all columns' $propertys to the given $value in $this->column_style.
* @param int $property
* @param string $value
* @return void
*/
function column_style_all($property, $value) {
foreach (array_keys($this->columns) as $column) {
$this->column_style[$column][$property] = $value;
}
}
/**
* Sets $this->baseurl.
* @param moodle_url|string $url the url with params needed to call up this page
*/
function define_baseurl($url) {
$this->baseurl = new moodle_url($url);
}
/**
* @param array $columns an array of identifying names for columns. If
* columns are sorted then column names must correspond to a field in sql.
*/
function define_columns($columns) {
$this->columns = array();
$this->column_style = array();
$this->column_class = array();
$colnum = 0;
foreach ($columns as $column) {
$this->columns[$column] = $colnum++;
$this->column_style[$column] = array();
$this->column_class[$column] = '';
$this->column_suppress[$column] = false;
}
}
/**
* @param array $headers numerical keyed array of displayed string titles
* for each column.
*/
function define_headers($headers) {
$this->headers = $headers;
}
/**
* Mark a specific column as being a table header using the column name defined in define_columns.
*
* Note: Only one column can be a header, and it will be rendered using a th tag.
*
* @param string $column
*/
public function define_header_column(string $column) {
$this->headercolumn = $column;
}
/**
* Defines a help icon for the header
*
* Always use this function if you need to create header with sorting and help icon.
*
* @param renderable[] $helpicons An array of renderable objects to be used as help icons
*/
public function define_help_for_headers($helpicons) {
$this->helpforheaders = $helpicons;
}
/**
* Must be called after table is defined. Use methods above first. Cannot
* use functions below till after calling this method.
* @return type?
*/
function setup() {
global $SESSION;
if (empty($this->columns) || empty($this->uniqueid)) {
return false;
}
// Load any existing user preferences.
if ($this->persistent) {
$this->prefs = json_decode(get_user_preferences('flextable_' . $this->uniqueid), true);
$oldprefs = $this->prefs;
} else if (isset($SESSION->flextable[$this->uniqueid])) {
$this->prefs = $SESSION->flextable[$this->uniqueid];
$oldprefs = $this->prefs;
}
// Set up default preferences if needed.
if (!$this->prefs or optional_param($this->request[TABLE_VAR_RESET], false, PARAM_BOOL)) {
$this->prefs = array(
'collapse' => array(),
'sortby' => array(),
'i_first' => '',
'i_last' => '',
'textsort' => $this->column_textsort,
);
}
if (!isset($oldprefs)) {
$oldprefs = $this->prefs;
}
$this->set_hide_show_preferences();
$this->set_sorting_preferences();
$this->set_initials_preferences();
// Save user preferences if they have changed.
if ($this->prefs != $oldprefs) {
if ($this->persistent) {
set_user_preference('flextable_' . $this->uniqueid, json_encode($this->prefs));
} else {
$SESSION->flextable[$this->uniqueid] = $this->prefs;
}
}
unset($oldprefs);
if (empty($this->baseurl)) {
debugging('You should set baseurl when using flexible_table.');
global $PAGE;
$this->baseurl = $PAGE->url;
}
if ($this->currpage == null) {
$this->currpage = optional_param($this->request[TABLE_VAR_PAGE], 0, PARAM_INT);
}
$this->setup = true;
// Always introduce the "flexible" class for the table if not specified
if (empty($this->attributes)) {
$this->attributes['class'] = 'flexible table table-striped table-hover';
} else if (!isset($this->attributes['class'])) {
$this->attributes['class'] = 'flexible table table-striped table-hover';
} else if (!in_array('flexible', explode(' ', $this->attributes['class']))) {
$this->attributes['class'] = trim('flexible table table-striped table-hover ' . $this->attributes['class']);
}
}
/**
* Get the order by clause from the session or user preferences, for the table with id $uniqueid.
* @param string $uniqueid the identifier for a table.
* @return SQL fragment that can be used in an ORDER BY clause.
*/
public static function get_sort_for_table($uniqueid) {
global $SESSION;
if (isset($SESSION->flextable[$uniqueid])) {
$prefs = $SESSION->flextable[$uniqueid];
} else if (!$prefs = json_decode(get_user_preferences('flextable_' . $uniqueid), true)) {
return '';
}
if (empty($prefs['sortby'])) {
return '';
}
if (empty($prefs['textsort'])) {
$prefs['textsort'] = array();
}
return self::construct_order_by($prefs['sortby'], $prefs['textsort']);
}
/**
* Prepare an an order by clause from the list of columns to be sorted.
* @param array $cols column name => SORT_ASC or SORT_DESC
* @return SQL fragment that can be used in an ORDER BY clause.
*/
public static function construct_order_by($cols, $textsortcols=array()) {
global $DB;
$bits = array();
foreach ($cols as $column => $order) {
if (in_array($column, $textsortcols)) {
$column = $DB->sql_order_by_text($column);
}
if ($order == SORT_ASC) {
$bits[] = $column . ' ASC';
} else {
$bits[] = $column . ' DESC';
}
}
return implode(', ', $bits);
}
/**
* @return SQL fragment that can be used in an ORDER BY clause.
*/
public function get_sql_sort() {
return self::construct_order_by($this->get_sort_columns(), $this->column_textsort);
}
/**
* Get the columns to sort by, in the form required by {@link construct_order_by()}.
* @return array column name => SORT_... constant.
*/
public function get_sort_columns() {
if (!$this->setup) {
throw new coding_exception('Cannot call get_sort_columns until you have called setup.');
}
if (empty($this->prefs['sortby'])) {
return array();
}
foreach ($this->prefs['sortby'] as $column => $notused) {
if (isset($this->columns[$column])) {
continue; // This column is OK.
}
if (in_array($column, get_all_user_name_fields()) &&
isset($this->columns['fullname'])) {
continue; // This column is OK.
}
// This column is not OK.
unset($this->prefs['sortby'][$column]);
}
return $this->prefs['sortby'];
}
/**
* @return int the offset for LIMIT clause of SQL
*/
function get_page_start() {
if (!$this->use_pages) {
return '';
}
return $this->currpage * $this->pagesize;
}
/**
* @return int the pagesize for LIMIT clause of SQL
*/
function get_page_size() {
if (!$this->use_pages) {
return '';
}
return $this->pagesize;
}
/**
* @return string sql to add to where statement.
*/
function get_sql_where() {
global $DB;
$conditions = array();
$params = array();
if (isset($this->columns['fullname'])) {
static $i = 0;
$i++;
if (!empty($this->prefs['i_first'])) {
$conditions[] = $DB->sql_like('firstname', ':ifirstc'.$i, false, false);
$params['ifirstc'.$i] = $this->prefs['i_first'].'%';
}
if (!empty($this->prefs['i_last'])) {
$conditions[] = $DB->sql_like('lastname', ':ilastc'.$i, false, false);
$params['ilastc'.$i] = $this->prefs['i_last'].'%';
}
}
return array(implode(" AND ", $conditions), $params);
}
/**
* Add a row of data to the table. This function takes an array or object with
* column names as keys or property names.
*
* It ignores any elements with keys that are not defined as columns. It
* puts in empty strings into the row when there is no element in the passed
* array corresponding to a column in the table. It puts the row elements in
* the proper order (internally row table data is stored by in arrays with
* a numerical index corresponding to the column number).
*
* @param object|array $rowwithkeys array keys or object property names are column names,
* as defined in call to define_columns.
* @param string $classname CSS class name to add to this row's tr tag.
*/
function add_data_keyed($rowwithkeys, $classname = '') {
$this->add_data($this->get_row_from_keyed($rowwithkeys), $classname);
}
/**
* Add a number of rows to the table at once. And optionally finish output after they have been added.
*
* @param (object|array|null)[] $rowstoadd Array of rows to add to table, a null value in array adds a separator row. Or a
* object or array is added to table. We expect properties for the row array as would be
* passed to add_data_keyed.
* @param bool $finish
*/
public function format_and_add_array_of_rows($rowstoadd, $finish = true) {
foreach ($rowstoadd as $row) {
if (is_null($row)) {
$this->add_separator();
} else {
$this->add_data_keyed($this->format_row($row));
}
}
if ($finish) {
$this->finish_output(!$this->is_downloading());
}
}
/**
* Add a seperator line to table.
*/
function add_separator() {
if (!$this->setup) {
return false;
}
$this->add_data(NULL);
}
/**
* This method actually directly echoes the row passed to it now or adds it
* to the download. If this is the first row and start_output has not
* already been called this method also calls start_output to open the table
* or send headers for the downloaded.
* Can be used as before. print_html now calls finish_html to close table.
*
* @param array $row a numerically keyed row of data to add to the table.
* @param string $classname CSS class name to add to this row's tr tag.
* @return bool success.
*/
function add_data($row, $classname = '') {
if (!$this->setup) {
return false;
}
if (!$this->started_output) {
$this->start_output();
}
if ($this->exportclass!==null) {
if ($row === null) {
$this->exportclass->add_seperator();
} else {
$this->exportclass->add_data($row);
}
} else {
$this->print_row($row, $classname);
}
return true;
}
/**
* You should call this to finish outputting the table data after adding
* data to the table with add_data or add_data_keyed.
*
*/
function finish_output($closeexportclassdoc = true) {
if ($this->exportclass!==null) {
$this->exportclass->finish_table();
if ($closeexportclassdoc) {
$this->exportclass->finish_document();
}
} else {
$this->finish_html();
}
}
/**
* Hook that can be overridden in child classes to wrap a table in a form
* for example. Called only when there is data to display and not
* downloading.
*/
function wrap_html_start() {
}
/**
* Hook that can be overridden in child classes to wrap a table in a form
* for example. Called only when there is data to display and not
* downloading.
*/
function wrap_html_finish() {
}
/**
* Call appropriate methods on this table class to perform any processing on values before displaying in table.
* Takes raw data from the database and process it into human readable format, perhaps also adding html linking when
* displaying table as html, adding a div wrap, etc.
*
* See for example col_fullname below which will be called for a column whose name is 'fullname'.
*
* @param array|object $row row of data from db used to make one row of the table.
* @return array one row for the table, added using add_data_keyed method.
*/
function format_row($row) {
if (is_array($row)) {
$row = (object)$row;
}
$formattedrow = array();
foreach (array_keys($this->columns) as $column) {
$colmethodname = 'col_'.$column;
if (method_exists($this, $colmethodname)) {
$formattedcolumn = $this->$colmethodname($row);
} else {
$formattedcolumn = $this->other_cols($column, $row);
if ($formattedcolumn===NULL) {
$formattedcolumn = $row->$column;
}
}
$formattedrow[$column] = $formattedcolumn;
}
return $formattedrow;
}
/**
* Fullname is treated as a special columname in tablelib and should always
* be treated the same as the fullname of a user.
* @uses $this->useridfield if the userid field is not expected to be id
* then you need to override $this->useridfield to point at the correct
* field for the user id.
*
* @param object $row the data from the db containing all fields from the
* users table necessary to construct the full name of the user in
* current language.
* @return string contents of cell in column 'fullname', for this row.
*/
function col_fullname($row) {
global $COURSE;
$name = fullname($row, has_capability('moodle/site:viewfullnames', $this->get_context()));
if ($this->download) {
return $name;
}
$userid = $row->{$this->useridfield};
if ($COURSE->id == SITEID) {
$profileurl = new moodle_url('/user/profile.php', array('id' => $userid));
} else {
$profileurl = new moodle_url('/user/view.php',
array('id' => $userid, 'course' => $COURSE->id));
}
return html_writer::link($profileurl, $name);
}
/**
* You can override this method in a child class. See the description of
* build_table which calls this method.
*/
function other_cols($column, $row) {
return NULL;
}
/**
* Used from col_* functions when text is to be displayed. Does the
* right thing - either converts text to html or strips any html tags
* depending on if we are downloading and what is the download type. Params
* are the same as format_text function in weblib.php but some default
* options are changed.
*/
function format_text($text, $format=FORMAT_MOODLE, $options=NULL, $courseid=NULL) {
if (!$this->is_downloading()) {
if (is_null($options)) {
$options = new stdClass;
}
//some sensible defaults
if (!isset($options->para)) {
$options->para = false;
}
if (!isset($options->newlines)) {
$options->newlines = false;
}
if (!isset($options->smiley)) {
$options->smiley = false;
}
if (!isset($options->filter)) {
$options->filter = false;
}
return format_text($text, $format, $options);
} else {
$eci = $this->export_class_instance();
return $eci->format_text($text, $format, $options, $courseid);
}
}
/**
* This method is deprecated although the old api is still supported.
* @deprecated 1.9.2 - Jun 2, 2008
*/
function print_html() {
if (!$this->setup) {
return false;
}
$this->finish_html();
}
/**
* This function is not part of the public api.
* @return string initial of first name we are currently filtering by
*/
function get_initial_first() {
if (!$this->use_initials) {
return NULL;
}
return $this->prefs['i_first'];
}
/**
* This function is not part of the public api.
* @return string initial of last name we are currently filtering by
*/
function get_initial_last() {
if (!$this->use_initials) {
return NULL;
}
return $this->prefs['i_last'];
}
/**
* Helper function, used by {@link print_initials_bar()} to output one initial bar.
* @param array $alpha of letters in the alphabet.
* @param string $current the currently selected letter.
* @param string $class class name to add to this initial bar.
* @param string $title the name to put in front of this initial bar.
* @param string $urlvar URL parameter name for this initial.
*
* @deprecated since Moodle 3.3
*/
protected function print_one_initials_bar($alpha, $current, $class, $title, $urlvar) {
debugging('Method print_one_initials_bar() is no longer used and has been deprecated, ' .
'to print initials bar call print_initials_bar()', DEBUG_DEVELOPER);
echo html_writer::start_tag('div', array('class' => 'initialbar ' . $class)) .
$title . ' : ';
if ($current) {
echo html_writer::link($this->baseurl->out(false, array($urlvar => '')), get_string('all'));
} else {
echo html_writer::tag('strong', get_string('all'));
}
foreach ($alpha as $letter) {
if ($letter === $current) {
echo html_writer::tag('strong', $letter);
} else {
echo html_writer::link($this->baseurl->out(false, array($urlvar => $letter)), $letter);
}
}
echo html_writer::end_tag('div');
}
/**
* This function is not part of the public api.
*/
function print_initials_bar() {
global $OUTPUT;
$ifirst = $this->get_initial_first();
$ilast = $this->get_initial_last();
if (is_null($ifirst)) {
$ifirst = '';
}
if (is_null($ilast)) {
$ilast = '';
}
if ((!empty($ifirst) || !empty($ilast) ||$this->use_initials)
&& isset($this->columns['fullname'])) {
$prefixfirst = $this->request[TABLE_VAR_IFIRST];
$prefixlast = $this->request[TABLE_VAR_ILAST];
echo $OUTPUT->initials_bar($ifirst, 'firstinitial', get_string('firstname'), $prefixfirst, $this->baseurl);
echo $OUTPUT->initials_bar($ilast, 'lastinitial', get_string('lastname'), $prefixlast, $this->baseurl);
}
}
/**
* This function is not part of the public api.
*/
function print_nothing_to_display() {
global $OUTPUT;
// Render the dynamic table header.
echo $this->get_dynamic_table_html_start();
// Render button to allow user to reset table preferences.