Inheritance and Polymorphism in PHP: Building a Form Generator - Part III - Listing full source code

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As stated previously, here's the full code for the form generator:

// base class formObject

class formObject {

var $label;

var $name;

var $style;

function formObject($label,$name,$style){

(!is_numeric($label))?$this->label=$label:die('Invalid parameter '.$label);

(!is_numeric($name))?$this->name=$name:die('Invalid
parameter '.$name);

(!is_numeric($style))?$this->style=$style:die('Invalid
parameter '.$style);

}

function generateHTML(){

echo 'You are not overriding the generateHTML() method
of the formObject super class!';

}

}

// derived class inputTextObject

class inputTextObject extends formObject {

var $value;

var $maxlength;

function inputTextObject
($label,$name,$style,$value,$maxlength){

parent::formObject($label,$name,$style);

(!is_numeric($value))?$this->value=$value:die('Invalid
parameter '.$value);

(is_int($maxlength)&&$maxlength>2&&$maxlenght<24)?
$this->maxlength=$maxlength:die('Invalid parameter
'.$maxlength);

}

function generateHTML(){

$html=$this->label.'<input type="text" name="'.$this-
>name.'" value="'.$this->value.'" class="'.$this-
>style.'" maxlength="'.$this->maxlength.'" />';

return $html;

}

}

// derived class hiddenFieldObject

class hiddenFieldObject extends formObject {

var $value;

function hiddenFieldObject($label,$name,$style,$value){

parent::formObject($label,$name,$style);

(!is_numeric($value))?$this->value=$value:die('Invalid
parameter '.$value);

}

function generateHTML(){

$html='<input type="hidden" name="'.$this->name.'"
value="'.$this->value.'" class="'.$this->style.'" />';

return $html;

}

}

// derived class radioButtonObject

class radioButtonObject extends formObject {

var $value;

var $checked;

function radioButtonObject
($label,$name,$style,$value,$checked=''){

parent::formObject($label,$name,$style);

(!is_numeric($value))?$this->value=$value:die('Invalid
parameter '.$value);

($checked=='checked'||$checked=='')?$this-
>checked=$checked:die('Invalid parameter '.$checked);

}

function generateHTML(){

$html='<input type="radio" name="'.$this->name.'"
value="'.$this->value.'" class="'.$this->style.'"';

($this->checked=='checked')?$html.=' checked="'.$this-
>checked.'" />'.$this->label:$html.=' />'.$this->label;

return $html;

}

}

// derived class checkBoxObject

class checkBoxObject extends formObject {

var $value;

var $checked;

function checkBoxObject
($label,$name,$style,$value,$checked=''){

parent::formObject($label,$name,$style);

(!is_numeric($value))?$this->value=$value:die('Invalid
parameter '.$value);

($checked=='checked'||$checked=='')?$this-
>checked=$checked:die('Invalid parameter '.$checked);

}

function generateHTML(){

$html='<input type="checkbox" name="'.$this->name.'"
value="'.$this->value.'" class="'.$this->style.'"';

($this->checked=='checked')?$html.=' checked="'.$this-
>checked.'" />'.$this->label:$html.=' />'.$this->label;

return $html;

}

}

// derived class selectObject

class selectObject extends formObject {

var $size;

var $options;

function selectObject
($label,$name,$style,$size,$options=array()){

parent::formObject($label,$name,$style);

(is_integer($size)&&$size>0)?$this->size=$size:die
('Invalid parameter '.$size);

(count($options)>0)?$this->options=$options:die
('Invalid parameter '.$options);

}

function generateHTML(){

$html=$this->label.'<select name="'.$this->name.'"
class="'.$this->style.'" size="'.$this->size.'">';

foreach($this->options as $option=>$value){

$html.='<option
value="'.$value.'">'.$option.'</option>';

}

$html.='</select>';

return $html;

}

}

// derived class textAreaObject

class textAreaObject extends formObject {

var $value;

var $wrap;

function textAreaObject
($label,$name,$style,$value,$wrap='virtual'){

parent::formObject($label,$name,$style);

(!is_numeric($value))?$this->value=$value:die('Invalid
parameter '.$value);

($wrap=='off'||$wrap=='physical'||$wrap=='virtual')?
$this->wrap=$wrap:die('Invalid parameter '.$wrap);

}

function generateHTML(){

$html=$this->label.'<textarea name="'.$this->name.'"
class="'.$this->style.'" wrap="'.$this-
>wrap.'">'.$this->value.'</textarea>';

return $html;

}

}

// derived class buttonObject

class buttonObject extends formObject {

var $value;

function buttonObject($label,$name,$style,$value){

parent::formObject($label,$name,$style);

(!is_numeric($value))?$this->value=$value:die('Invalid
parameter '.$value);

}

function generateHTML(){

$html=$this->label.'<input type="button" name="'.$this-
>name.'" value="'.$this->value.'" class="'.$this-
>style.'" />';

return $html;

}

}

// derived class passwordObject

class passwordObject extends formObject {

var $maxlength;

function passwordObject($label,$name,$style,$maxlength){

parent::formObject($label,$name,$style);

(is_int($maxlength)&&$maxlength>8&&$maxlenght<24)?
$this->maxlength=$maxlength:die('Invalid parameter
'.$maxlength);

}

function generateHTML(){

$html=$this->label.'<input type="password"
name="'.$this->name.'" value="'.$this->value.'"
class="'.$this->style.'" />';

return $html;

}

}

// derived class fileObject

class fileObject extends formObject {

function fileObject($label,$name,$style){

parent::formObject($label,$name,$style);

}

function generateHTML(){

$html=$this->label.'<input type="file" name="'.$this-
>name.'" class="'.$this->style.'" />';

return $html;

}

}

// derived class imageObject

class imageObject extends formObject {

var $value;

var $src;

var $alt;

function imageObject
($label,$name,$style,$value,$src,$alt){

parent::formObject($label,$name,$style);

(!is_numeric($value))?$this->value=$value:die('Invalid
parameter '.$value);

(!is_numeric($alt))?$this->alt=$alt:die('Invalid
parameter '.$alt);

(file_exists($src))?$this->src=$src:die('Invalid
parameter '.$src);

}

function generateHTML(){

$html=$this->label.'<input type="image" name="'.$this-
>name.'" value="'.$this->value.'" class="'.$this-
>style.'" src="'.$this->src.'" alt="'.$this-
>alt.'" />';

return $html;

}

}

// derived class resetObject

class resetObject extends formObject {

var $value;

function resetObject($label,$name,$style,$value){

parent::formObject($label,$name,$style);

(!is_numeric($value))?$this->value=$value:die('Invalid
parameter '.$value);

}

function generateHTML(){

$html=$this->label.'<input type="reset" name="'.$this-
>name.'" value="'.$this->value.'" class="'.$this-
>style.'" />';

return $html;

}

}

// derived class submitObject

class submitObject extends formObject {

var $value;

function submitObject($label,$name,$style,$value){

parent::formObject($label,$name,$style);

(!is_numeric($value))?$this->value=$value:die('Invalid
parameter '.$value);

}

function generateHTML(){

$html=$this->label.'<input type="submit" name="'.$this-
>name.'" value="'.$this->value.'" class="'.$this-
>style.'" />';

return $html;

}

}

Now you have some code to play around with. I hope you have a good time finding possible additions. Just be creative and put your background to work.

Conclusion

Over this three-part series, we've learned a bit more about the capabilities of Inheritance and Polymorphism in PHP 4, building a practical example to generate HTML forms using an Object-Oriented approach. Also, the process has introduced some theory concepts that hopefully will help you gain a better understanding of OOP. Without a doubt, the OOP approach is the best way to manage large projects in PHP, due to the pluggable nature of objects. When you have a couple of classes working for you, it's just a matter of making them interact to rapidly develop Web applications. The learning curve is rather long, but the effort is truly worthwhile.

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Comments On: Inheritance and Polymorphism in PHP: Building a Form Generator - Part III

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