Disregard Inputs, Acquire Zend_Form

Disregard Inputs

Acquire Zend_Form

Daniel Cousineau
Interactive Software Engineer @ RAPP
@dcousineau
http://dcousineau.com/
dcousineau@gmail.com

Zend_Acl Zend_Gdata Zend_Search_Lucene
Zend_Amf Zend_Http Zend_Serializer
Zend_Application Zend_InfoCard Zend_Server
Zend_Auth Zend_Json Zend_Service
Zend_Barcode Zend_Layout Zend_Session
Zend_Cache Zend_Ldap Zend_Soap
Zend_Captcha Zend_Loader Zend_Tag
Zend_Cloud Zend_Locale Zend_Test
Zend_CodeGenerator Zend_Log Zend_Text
Zend_Config Zend_Mail Zend_TimeSync
Zend_Config_Writer Zend_Markup Zend_Tool
Zend_Console_Getopt Zend_Measure Zend_Tool_Framework
Zend_Controller Zend_Memory Zend_Tool_Project
Zend_Currency Zend_Mime Zend_Translate
Zend_Date Zend_Navigation Zend_Uri
Zend_Db Zend_Oauth Zend_Validate
Zend_Debug Zend_OpenId Zend_Version
Zend_Dojo Zend_Paginator Zend_View
Zend_Dom Zend_Pdf Zend_Wildfire
Zend_Exception Zend_ProgressBar Zend_XmlRpc
Zend_Feed Zend_Queue ZendX_Console_Process_Unix
Zend_File Zend_Reflection ZendX_JQuery
Zend_Filter Zend_Registry
Zend_Form Zend_Rest

I CAN HAZ

HAI WERLD!?!
http://snipsnsnailsandpuppydogtails.blogspot.com/2010/05/introducing-captain-jack-sparrow-and.html

Zend_Form
$form = new Zend_Form();

$form->setAction('/path/to/action')
->setMethod('post')
->setAttrib('id', 'FORMID');

Render Form
$output = $form->render();

<?php print $form; ?>

<form id="FORMID"
enctype="application/x-www-form-urlencoded"
action="/path/to/action"
method="post">
<dl class="zend_form"></dl>
</form>

Add Elements
$form->addElement('text', 'hello', array(
'label' => 'Oh Hai Werld!',
'required' => true,
));

$element = new Zend_Form_Element_Text('hello');
$element->setLabel('Oh Hai Werld!')
->setRequired(true);

$form->addElement($element, 'hello');

Add Elements
<dl>
<dt id="hello-label">
<label for="hello" class="required">
Oh Hai Werld!
</label>
</dt>
<dd id="hello-element">
<input type="text" name="hello" id="hello" value="">
</dd>
</dl>

Zend_Form_Element_Button
Zend_Form_Element_Captcha
Zend_Form_Element_Checkbox
Zend_Form_Element_File
Zend_Form_Element_Hidden
Zend_Form_Element_Hash
Zend_Form_Element_Image
Zend_Form_Element_MultiCheckbox
Zend_Form_Element_Multiselect
Zend_Form_Element_Radio
Zend_Form_Element_Reset
Zend_Form_Element_Select
Zend_Form_Element_Submit
Zend_Form_Element_Text
Zend_Form_Element_Textarea

Handle Input
if (!empty($_POST) && $form->isValid($_POST)) {
$values = $form->getValues(); //FORM IS VALID
}

if ($this->getRequest()->isPost()
&& $form->isValid($this->getRequest()->getParams())) {
$values = $form->getValues(); //FORM IS VALID
}

Add Validation
'validators' => array(
'Alnum' //@see Zend_Validate_Alnum
),
));

new Zend_Validate_Alnum(),
),
));

Add Filters
'filters' => array(
'StringTrim' //@see Zend_Filter_StringTrim
),
));

'filters' => array(
new Zend_Filter_StringTrim(),
),
));

Extend Zend_Form Object
class Namespace_Form_HelloWorld extends Zend_Form {
public function init() {
/* Form Elements & Other Definitions Here ... */
$this->addElement('text', 'hello', array(
'required' => true,
'Alnum',
),
));

$this->addElement('submit', 'submit', array(
'label' => 'I Can Haz Submit',
));
}
}

Extend Zend_Form Object

$form = new Zend_Form();

$form = new Namespace_Form_HelloWorld();

Decorator Pattern

BASICALLY: Wrappers for rendering
Element has list of decorators
Render Decorator n
Send output to Decorator n+1
Repeat until no more decorators

Decorator Pattern

2 “levels” of decorators
Form-Level
Element-Level
Form level decorator “FormElements” loops through
each element and triggers their render

FormElements DECORATOR

ELEMENT DECORATE
DECORATE
ELEMENT
DECORATE
...

ELEMENT

Default Form Decorators
$this->addDecorator('FormElements')
->addDecorator('HtmlTag', array(
'tag' => 'dl', 'class' => 'zend_form')
)
->addDecorator('Form');

<form>
<dl class=”zend_form”>
Loop & Render Form Elements

Default Element Decorators
$this->addDecorator('ViewHelper')
->addDecorator('Errors')
->addDecorator('Description', array('tag' => 'p', 'class' => 'description'))
'tag' => 'dd',
'id' => array('callback' => $getId)
))
->addDecorator('Label', array('tag' => 'dt'));

<dt>LABEL</dt>
<dd id=”...”>
<p class=”description”></p>
RENDER ELEMENT
<ul><li>ERRORS</li></ul>

PLEASE EXPLAIN TO ME

HOW BEST PRACTICES FITS
WITH PHILOSORAPTOR

Integrate Early

If you’re using custom decorators, set the prefix paths
EARLY. Constructor OR first few lines of init()
Optionally have an application-wide parent Form class
that all other forms extend
Here you can do common things like set the prefix
paths

Use render() Sparingly

Overriding Zend_Form::render() is tempting
Useful for bulk-altering element decorators
Just be very judicial

Extend Zend_Form_Element

Override loadDefaultDecorators()
Usually copy original, but replace ViewHelper with
custom decorator
Add ﬂags and features to your hearts content

Create Decorator

Override render()
Use an existing render from, say, HtmlTag, as a
starting point
Use array notation on any sub-ﬁelds
e.g. “fullyQualifiedName[foo]”, etc

Handle/Validate Input
Override setValue() and getValue()

setValue() will receive the value from $_FORM
(including sub-arrays, etc)
Override isValid() with caution:
isValid() calls setValue()

Possibly create custom Zend_Validate_ and
attach in the custom element

Using

$form->getPluginLoader(Zend_Form::DECORATOR)
->addPrefixPath('Namespace_Form_Decorator', '/path/to/decorators');

$form->getPluginLoader(Zend_Form::ELEMENT)
->addPrefixPath('Namespace_Form_Element', 'path/to/elements');

Custom Element
class Namespace_Form_Element_Markup extends Zend_Form_Element_Xhtml
{
public function isValid($value, $context = null) { return true; }

public function loadDefaultDecorators() {
if ($this->loadDefaultDecoratorsIsDisabled()) {
return;
}

$decorators = $this->getDecorators();
if (empty($decorators)) {
$this->addDecorator(new Namespace_Form_Decorator_Markup())
->addDecorator('HtmlTag', array('tag' => 'dd'));
}
}
}

Custom Decorator
class Namespace_Form_Decorator_Markup extends Zend_Form_Decorator_Abstract {
public function render($content) {
$element = $this->getElement();
if (!$element instanceof Namespace_Form_Element_Markup)
return $content;

$name = $element->getName();
$separator = $this->getSeparator();
$placement = $this->getPlacement();

$markup = '<div id="' . $name . '" class="markup">' .
$element->getValue() .
'</div>';

switch ($placement) {
case self::PREPEND:
return $markup . $separator . $content;
case self::APPEND: default:
return $content . $separator . $markup;
}
}
}

Custom Element
class Namespace_Form_Element_Date extends Zend_Form_Element_Xhtml {
const DEFAULT_DATE_FORMAT = '%year%-%month%-%day%';
//...
public function loadDefaultDecorators(){
if ($this->loadDefaultDecoratorsIsDisabled()) return;

$this->addDecorator(new Namespace_Form_Decorator_Date())
->addDecorator('Errors')
->addDecorator('Description', array('tag' => 'p', 'class' =>
'description'))
'tag' => 'dd',
'id' => $this->getName() . '-element')
)
->addDecorator('Label', array('tag' => 'dt'));
}

public function getDateFormat() {}
public function setDateFormat($dateFormat) {}
//...
}

Custom Element
//...
public function setValue($value) {
if (is_array($value)) {
$year = !empty($value['year']) ? $value['year'] : null;
$month = !empty($value['month']) ? $value['month'] : null;
$day = !empty($value['day']) ? $value['day'] : 1;
if ($year && $month) {
$date = new DateTime();
$date->setDate((int)$year, (int)$month, (int) $day);
$date->setTime(0, 0, 0);
$this->setAutoInsertNotEmptyValidator(false);
$this->_value = $date;
}
} else {
$this->_value = $value;
}

return $this;
}
//...
}

Custom Element
//...
public function getValue() {
switch ($this->getReturnType()) {
case self::RETURN_TYPE_ARRAY:
if ($this->_value === null)
return array('year' => null, 'month' => null, 'day' => null);

$date = array(
'year' => date('Y', $this->_value->getTimestamp()),
'month' => date('m', $this->_value->getTimestamp()),
'day' => date('d', $this->_value->getTimestamp())
);
array_walk_recursive($date, array($this, '_filterValue'));
return $date;
default:
throw new Zend_Form_Element_Exception('Unknown return type: ' . $this-
>getReturnType());
}
}
//...
}

class Namespace_Form_Decorator_Date extends Zend_Form_Decorator_Abstract {

Custom Decorator
const DEFAULT_DISPLAY_FORMAT = '%year% / %month% / %day%';
//...
public function render($content) {
$element = $this->getElement();
if (!$element instanceof FormElementDate)
return $content;

$view = $element->getView();
if (!$view instanceof Zend_View_Interface)
throw new Zend_Form_Decorator_Exception('View object is required');
//...
$markup = str_replace(
array('%year%', '%month%', '%day%'),
array(
$view->formSelect($name . '[year]', $year, $params, $years),
$view->formSelect($name . '[month]', $month, $params, $months),
$view->formSelect($name . '[day]', $day, $params, $days),
),
$this->displayFormat
);

switch ($this->getPlacement()) {
case self::PREPEND:
return $markup . $this->getSeparator() . $content;
case self::APPEND:
default:
return $content . $this->getSeparator() . $markup;
}
}
}

BEST PRACTICES

Y U NO USE THEM!?

Mimic Namespace
Mimic Zend_Form’s name spacing
Namespace_Form_Decorator_
Zend_Form_Decorator_
If you aren’t already, mimic Zend’s structure (PEAR
style)
Namespace_Form_Decorator_Date → Namespace/
Form/Decorator/Date.php

Use Preﬁx Paths Or Not

Either directly reference the custom classes throughout
your entire project, or don’t
Don’t jump back and forth

Disregard Inputs, Acquire Zend_Form

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