Understanding Input controls:

Constructor accepts 3 params:
function __construct($name , $properties , $parent)
$name = name of the input control. Eg. category_id
$properties = width, label, type, etc
$parent = Controller($this of the controller)

function write() dumps the input control

function custom() custom functions can be added which can be called through jquery/ajax requests for dynamism.
URL structure for ajax requests: 
var url = class_name + '/input_gate/' + control_name + '/custom_function_name'

BASIC INPUT CONTROL PROPERTIES:

$this->name;	//Field name of the control
$this->properties;	//Properties like input type, disabled, input label, remark, placeholder, etc
$this->value;		//Value in user input format
$this->validation_error;	//Validation error of input control
$this->table;	//database related to the controller(parent)