Codeigniter DataGrid Class - php

Question

So, I am building myself a simple(ish) datagrid class for my CodeIgniter app.
What I am wondering is, I have some columns that I would like to "format" in that I mean, some may contain only a 1 or a 0, yet I want to turn them into a Yes or No respectively.
How can I do this? In other words, I want to be able to pass in another parameter..something like:
$this->_columnCallBack pass it an array like array(column_number=>'NameOfCallBackFunction')
I am assuming that I would do it somewhat like I did the _columnclass, where I pass in the column number, and the class as an array... but I don't know how I would get the function to fire off to do the replacement...
Code
class O7thDG {
public function __construct($params){
$this->_table = $params['table'];
$this->_pk = $params['pk'];
$this->_fields = (isset($params['fields'])) ? $params['fields'] : null;
$this->_where = (isset($params['where'])) ? $params['where'] : null;
$this->_order = (isset($params['order'])) ? $params['order'] : null;
$this->_extras = (isset($params['extras'])) ? $params['extras'] : null;
$this->_add = (isset($params['add'])) ? $params['add'] : FALSE;
$this->_edit = (isset($params['edit'])) ? $params['edit'] : FALSE;
$this->_delete = (isset($params['delete'])) ? $params['delete'] : FALSE;
$this->_editlink = (isset($params['editlink'])) ? $params['editlink'] : null;
$this->_deletelink = (isset($params['deletelink'])) ? $params['deletelink'] : null;
$this->_editlinkextras = (isset($params['editlinkextras'])) ? $params['editlinkextras'] : null;
$this->_deletelinkextras = (isset($params['deletelinkextras'])) ? $params['deletelinkextras'] : null;
$this->_tableid = (isset($params['tableid'])) ? $params['tableid'] : null;
$this->_tableclass = (isset($params['tableclass'])) ? $params['tableclass'] : null;
$this->_columnclass = (isset($params['columnclass'])) ? $params['columnclass'] : null;
$this->_includeheader = (isset($params['includeheader'])) ? $params['includeheader'] : TRUE;
$this->_allowpaging = (isset($params['allowpaging'])) ? $params['allowpaging'] : FALSE;
$this->_sorting = (isset($params['sorting'])) ? $params['sorting'] : null;
$this->_columncallback = (isset($params['columncallback'])) ? $params['columncallback'] : null;
}
public function BuildIt($responsive = TRUE){
$_ci =& get_instance();
$_ci->load->database();
$_ci->load->library('table');
$_ci->load->library('TKCommon', null, 'comm');
$fldlist = $this->_buildSelectFieldList();
$_ci->db->select($fldlist);
$cols = $this->_buildColumnFieldList();
$ret = '';
if($this->_where != null){
// build the where
}
if($this->_order != null){
// build the order
}
if($this->_extras != null){
// build the extras
}
// Query the specified table
$qry = $_ci->db->get($this->_table);
if($cols == null){
$cols = $_ci->db->list_fields($this->_table);
$fldlist = $cols;
}else{
$fldlist = explode(', ', $fldlist);
}
if($qry){
// throw the results into an associative array
$rs = $qry->result_array();
if($rs){
$rCt = count($rs);
$cCt = $qry->num_fields();
// add our responsive wrapper
if($responsive){
$ret .= '<div class="table-responsive">';
}
// fire up our table
$tid = '';
$tc = '';
if($this->_tableid != null){$tid = ' id="' .$this->_tableid . '"';}
if($this->_tableclass != null){$tc = ' class="' .$this->_tableclass . '"';}
$_ci->table->set_template(array('table_open'=>'<table' . $tid . $tc . '>'));
// build our header row, but only if we need to
if($this->_includeheader && $cCt > 0){
// see if we need to include the admin column
if($this->_edit || $this->_delete){
$_ci->table->set_heading(array_merge($cols, array('Admin')));
}else{
$_ci->table->set_heading($cols);
}
}
// build each records row
for($r = 0; $r < $rCt; ++$r){
$ca = array();
for($c = 0; $c < $cCt; ++$c){
if(($this->_columnclass != null) && ($c == key($this->_columnclass))){
// figure out which column needs the class, and what class needs to be applied
$ca[] = $this->_columnCallback($c, array('data'=>$rs[$r][$fldlist[$c]], 'class'=>$this->_columnclass[key($this->_columnclass)]));
}else{
$ca[] = $this->_columnCallback($c, $rs[$r][$fldlist[$c]]);
}
}
// see if we need to include the admin column
if(($this->_edit || $this->_delete) && ($this->_editlink != null || $this->_deletelink != null)){
$txt = '';
if($this->_edit &&($this->_editlink != null)){
$txt .= '<span class="fa fa-pencil fa-lg"></span> ';
}
if($this->_delete &&($this->_deletelink != null)){
$txt .= '<span class="fa fa-trash-o fa-lg"></span>';
}
if(($this->_columnclass != null) && ($cCt == key($this->_columnclass))){
$ca[] = array('data'=>$txt, 'class'=>$this->_columnclass[key($this->_columnclass)]);
}else{
$ca[] = $txt;
}
}
$_ci->table->add_row($ca);
}
$ret .= $_ci->table->generate();
// close our responsive wrapper
if($responsive){
$ret .= '</div>';
}
}else{
$ret .= $_ci->comm->ErrorBox('There was an issue running the query, please make sure at least your primary key, and table are correct.');
}
}else{
$ret .= $_ci->comm->ErrorBox('There was an issue running the query, please make sure at least your primary key, and table are correct.');
}
return $ret;
}
// build our select's field list
private function _buildSelectFieldList(){
if($this->_fields == null){
return '*';
}else{
$flds = array_map(function($item){return $item['field'];}, $this->_fields);
return implode(', ', $flds);
}
}
// build our tables column list
private function _buildColumnFieldList(){
if($this->_fields == null){
return null;
}else{
return array_map(function($item){return $item['label'];}, $this->_fields);
}
}
private function _columnCallback($col, $val){
if($this->_columncallback != null){
if($col == key($this->_columncallback))
return $this->_columncallback[key($this->_columncallback)]($val);
}else{
return $val;
}
}
}
and my external function that I may want to use is simply:
// Format boolean value to Yes or No
public function YesNo($val){
return ((bool)$val) ? 'Yes' : 'No' ;
}
CI Documentation for the table class has $this->table->function, however, the function(s) passed applies to the entire table

Answer 1

What about using and/or anonymous functions:
http://docs.php.net/manual/es/function.func-get-args.php
http://php.net/manual/en/functions.anonymous.php
Update 2 "reloaded"
You could also check grocery crud, it's CI library and do some interesting things that can be useful for you project:
http://www.grocerycrud.com/
Grocery crud uses call_user_func from PHP and allows you to use any function declaread in your controller, if this is what you need then it's just matter of time and check grocery crud code.
In the library a protected property is declared for each callback for example (line #3386 v1.4.1):
/* Callbacks */
protected $callback_before_insert = null;
So you/me/any can set the callback function in case is needed, then check for any callback setted doing something like (line #878 GroceryCrud 1.4.1):
if($this->callback_before_insert !== null)
{
$callback_return = call_user_func($this->callback_before_insert, $post_data);
if(!empty($callback_return) && is_array($callback_return))
$post_data = $callback_return;
elseif($callback_return === false)
return false;
}
Of course there's a method to set the callback (line #4518 from v1.4.1):
public function callback_before_insert($callback = null)
{
$this->callback_before_insert = $callback;
return $this;
}
And the user/dev set the callback doing:
$crud->callback_before_insert(array($this,'my_callback'));
And/Or this technique allows you use something like:
$this->load->model('Customers');
$crud->callback_before_insert(array($this->Customers,'getCustomersCallback'));
even if you're usign php 5.3 or greater you can use an anonymous method:
$crud->callback_before_insert(function($post_array){
$post_array['user_id'] = $this->session->userdata('user_id');
return $post_array;
});
More info: http://www.grocerycrud.com/documentation/tutorial_using_callbacks
About Grocery Crud:
Author: John Skoumbourdis (more about author/library)
Web: GroceryCrud
License: released with dual licensing, using the GPL v3 and the MIT license.
Update 3
Update I've read more carefully your question, thinking functions varible can work for you:
http://php.net/manual/es/functions.variable-functions.php
See the first and second samples here: http://www.php.net/manual/en/language.oop5.php
Still don't know if they will work "outside" your class, but it could.

Answer 2

These functions will work as you want to, but you need to rewrite a bit for your needs.
function callback1($array, $row_id, $function)
{
if(function_exists($function))
return $function($array[$row_id]);
else
return 0;
}
function YesNo($val)
{
return intval($val) ? 'Yes' : 'No' ;
}
#example of array and usage of script.
$array = array('id' => '0', 'id2' => '1');
$ok = callback1($array, 'id2', 'YesNo');

Answer 3

Make filters array
$this->filters = ['column_name' => 'function_name', 'column_name2' => 'otherFunction'];
Then you just apply the filter to the data
if ( array_key_exists($column_name, $this->filters) ) {
// Add row that contains filtered data
$row_data = $this->filters[$column_name]($column_val);
}else{
$row_data = $column_val;
}
If your functions aren't available globally (not in a helper or built-in php), you'll have to use something like this:
call_user_func(array($this, $this->filters[$column_name]), $column_val);
OR
$this->{$this->filters[$column_name]}($column_val);
This would run a function from inside the library O7...