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form.php
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form.php
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<?php
/**
* @package Joomla.Platform
* @subpackage Form
*
* @copyright Copyright (C) 2005 - 2011 Open Source Matters, Inc. All rights reserved.
* @license GNU General Public License version 2 or later; see LICENSE
*/
defined('JPATH_PLATFORM') or die();
jimport('joomla.filesystem.path');
jimport('joomla.form.formfield');
jimport('joomla.registry.registry');
jimport('joomla.form.helper');
jimport('joomla.utilities.arrayhelper');
/**
* Form Class for the Joomla Platform.
*
* This class implements a robust API for constructing, populating, filtering, and validating forms.
* It uses XML definitions to construct form fields and a variety of field and rule classes to
* render and validate the form.
*
* @package Joomla.Platform
* @subpackage Form
* @link http://www.w3.org/TR/html4/interact/forms.html
* @link http://www.w3.org/TR/html5/forms.html
* @since 11.1
*/
class JForm
{
/**
* The JRegistry data store for form fields during display.
* @var object
* @since 11.1
*/
protected $data;
/**
* The form object errors array.
* @var array
* @since 11.1
*/
protected $errors = array();
/**
* The name of the form instance.
* @var string
* @since 11.1
*/
protected $name;
/**
* The form object options for use in rendering and validation.
* @var array
* @since 11.1
*/
protected $options = array();
/**
* The form XML definition.
* @var object
* @since 11.1
*/
protected $xml;
/**
* Form instances.
* @var array
* @since 11.1
*/
protected static $forms = array();
/**
* Method to instantiate the form object.
*
* @param string $name The name of the form.
* @param array $options An array of form options.
*
* @since 11.1
*/
public function __construct($name, array $options = array())
{
// Set the name for the form.
$this->name = $name;
// Initialise the JRegistry data.
$this->data = new JRegistry;
// Set the options if specified.
$this->options['control'] = isset($options['control']) ? $options['control'] : false;
}
/**
* Method to bind data to the form.
*
* @param mixed $data An array or object of data to bind to the form.
*
* @return boolean True on success.
*
* @since 11.1
*/
public function bind($data)
{
// Make sure there is a valid JForm XML document.
if (!($this->xml instanceof JXMLElement))
{
return false;
}
// The data must be an object or array.
if (!is_object($data) && !is_array($data))
{
return false;
}
// Convert the input to an array.
if (is_object($data))
{
if ($data instanceof JRegistry)
{
// Handle a JRegistry.
$data = $data->toArray();
}
elseif ($data instanceof JObject)
{
// Handle a JObject.
$data = $data->getProperties();
}
else
{
// Handle other types of objects.
$data = (array) $data;
}
}
// Process the input data.
foreach ($data as $k => $v)
{
if ($this->findField($k))
{
// If the field exists set the value.
$this->data->set($k, $v);
}
elseif (is_object($v) || JArrayHelper::isAssociative($v))
{
// If the value is an object or an associative array hand it off to the recursive bind level method.
$this->bindLevel($k, $v);
}
}
return true;
}
/**
* Method to bind data to the form for the group level.
*
* @param string $group The dot-separated form group path on which to bind the data.
* @param mixed $data An array or object of data to bind to the form for the group level.
*
* @return void
*
* @since 11.1
*/
protected function bindLevel($group, $data)
{
// Ensure the input data is an array.
settype($data, 'array');
// Process the input data.
foreach ($data as $k => $v)
{
if ($this->findField($k, $group))
{
// If the field exists set the value.
$this->data->set($group . '.' . $k, $v);
}
elseif (is_object($v) || JArrayHelper::isAssociative($v))
{
// If the value is an object or an associative array, hand it off to the recursive bind level method
$this->bindLevel($group . '.' . $k, $v);
}
}
}
/**
* Method to filter the form data.
*
* @param array $data An array of field values to filter.
* @param string $group The dot-separated form group path on which to filter the fields.
*
* @return mixed Array or false.
*
* @since 11.1
*/
public function filter($data, $group = null)
{
// Make sure there is a valid JForm XML document.
if (!($this->xml instanceof JXMLElement))
{
return false;
}
// Initialise variables.
$input = new JRegistry($data);
$output = new JRegistry;
// Get the fields for which to filter the data.
$fields = $this->findFieldsByGroup($group);
if (!$fields)
{
// PANIC!
return false;
}
// Filter the fields.
foreach ($fields as $field)
{
// Initialise variables.
$name = (string) $field['name'];
// Get the field groups for the element.
$attrs = $field->xpath('ancestor::fields[@name]/@name');
$groups = array_map('strval', $attrs ? $attrs : array());
$group = implode('.', $groups);
// Get the field value from the data input.
if ($group)
{
// Filter the value if it exists.
if ($input->exists($group . '.' . $name))
{
$output->set($group . '.' . $name, $this->filterField($field, $input->get($group . '.' . $name, (string) $field['default'])));
}
}
else
{
// Filter the value if it exists.
if ($input->exists($name))
{
$output->set($name, $this->filterField($field, $input->get($name, (string) $field['default'])));
}
}
}
return $output->toArray();
}
/**
* Return all errors, if any.
*
* @return array Array of error messages or JException objects.
*
* @since 11.1
*/
public function getErrors()
{
return $this->errors;
}
/**
* Method to get a form field represented as a JFormField object.
*
* @param string $name The name of the form field.
* @param string $group The optional dot-separated form group path on which to find the field.
* @param mixed $value The optional value to use as the default for the field.
*
* @return mixed The JFormField object for the field or boolean false on error.
*
* @since 11.1
*/
public function getField($name, $group = null, $value = null)
{
// Make sure there is a valid JForm XML document.
if (!($this->xml instanceof JXMLElement))
{
return false;
}
// Attempt to find the field by name and group.
$element = $this->findField($name, $group);
// If the field element was not found return false.
if (!$element)
{
return false;
}
return $this->loadField($element, $group, $value);
}
/**
* Method to get an attribute value from a field XML element. If the attribute doesn't exist or
* is null then the optional default value will be used.
*
* @param string $name The name of the form field for which to get the attribute value.
* @param string $attribute The name of the attribute for which to get a value.
* @param mixed $default The optional default value to use if no attribute value exists.
* @param string $group The optional dot-separated form group path on which to find the field.
*
* @return mixed The attribute value for the field.
*
* @since 11.1
*/
public function getFieldAttribute($name, $attribute, $default = null, $group = null)
{
// Make sure there is a valid JForm XML document.
if (!($this->xml instanceof JXMLElement))
{
// TODO: throw exception.
return $default;
}
// Find the form field element from the definition.
$element = $this->findField($name, $group);
// If the element exists and the attribute exists for the field return the attribute value.
if (($element instanceof JXMLElement) && ((string) $element[$attribute]))
{
return (string) $element[$attribute];
}
// Otherwise return the given default value.
else
{
return $default;
}
}
/**
* Method to get an array of JFormField objects in a given fieldset by name. If no name is
* given then all fields are returned.
*
* @param string $set The optional name of the fieldset.
*
* @return array The array of JFormField objects in the fieldset.
*
* @since 11.1
*/
public function getFieldset($set = null)
{
// Initialise variables.
$fields = array();
// Get all of the field elements in the fieldset.
if ($set)
{
$elements = $this->findFieldsByFieldset($set);
}
// Get all fields.
else
{
$elements = $this->findFieldsByGroup();
}
// If no field elements were found return empty.
if (empty($elements))
{
return $fields;
}
// Build the result array from the found field elements.
foreach ($elements as $element)
{
// Get the field groups for the element.
$attrs = $element->xpath('ancestor::fields[@name]/@name');
$groups = array_map('strval', $attrs ? $attrs : array());
$group = implode('.', $groups);
// If the field is successfully loaded add it to the result array.
if ($field = $this->loadField($element, $group))
{
$fields[$field->id] = $field;
}
}
return $fields;
}
/**
* Method to get an array of fieldset objects optionally filtered over a given field group.
*
* @param string $group The dot-separated form group path on which to filter the fieldsets.
*
* @return array The array of fieldset objects.
*
* @since 11.1
*/
public function getFieldsets($group = null)
{
// Initialise variables.
$fieldsets = array();
$sets = array();
// Make sure there is a valid JForm XML document.
if (!($this->xml instanceof JXMLElement))
{
return $fieldsets;
}
if ($group)
{
// Get the fields elements for a given group.
$elements = &$this->findGroup($group);
foreach ($elements as &$element)
{
// Get an array of <fieldset /> elements and fieldset attributes within the fields element.
if ($tmp = $element->xpath('descendant::fieldset[@name] | descendant::field[@fieldset]/@fieldset'))
{
$sets = array_merge($sets, (array) $tmp);
}
}
}
else
{
// Get an array of <fieldset /> elements and fieldset attributes.
$sets = $this->xml->xpath('//fieldset[@name] | //field[@fieldset]/@fieldset');
}
// If no fieldsets are found return empty.
if (empty($sets))
{
return $fieldsets;
}
// Process each found fieldset.
foreach ($sets as $set)
{
// Are we dealing with a fieldset element?
if ((string) $set['name'])
{
// Only create it if it doesn't already exist.
if (empty($fieldsets[(string) $set['name']]))
{
// Build the fieldset object.
$fieldset = (object) array('name' => '', 'label' => '', 'description' => '');
foreach ($set->attributes() as $name => $value)
{
$fieldset->$name = (string) $value;
}
// Add the fieldset object to the list.
$fieldsets[$fieldset->name] = $fieldset;
}
}
// Must be dealing with a fieldset attribute.
else
{
// Only create it if it doesn't already exist.
if (empty($fieldsets[(string) $set]))
{
// Attempt to get the fieldset element for data (throughout the entire form document).
$tmp = $this->xml->xpath('//fieldset[@name="' . (string) $set . '"]');
// If no element was found, build a very simple fieldset object.
if (empty($tmp))
{
$fieldset = (object) array('name' => (string) $set, 'label' => '', 'description' => '');
}
// Build the fieldset object from the element.
else
{
$fieldset = (object) array('name' => '', 'label' => '', 'description' => '');
foreach ($tmp[0]->attributes() as $name => $value)
{
$fieldset->$name = (string) $value;
}
}
// Add the fieldset object to the list.
$fieldsets[$fieldset->name] = $fieldset;
}
}
}
return $fieldsets;
}
/**
* Method to get the form control. This string serves as a container for all form fields. For
* example, if there is a field named 'foo' and a field named 'bar' and the form control is
* empty the fields will be rendered like: <input name="foo" /> and <input name="bar" />. If
* the form control is set to 'joomla' however, the fields would be rendered like:
* <input name="joomla[foo]" /> and <input name="joomla[bar]" />.
*
* @return string The form control string.
*
* @since 11.1
*/
public function getFormControl()
{
return (string) $this->options['control'];
}
/**
* Method to get an array of JFormField objects in a given field group by name.
*
* @param string $group The dot-separated form group path for which to get the form fields.
* @param boolean $nested True to also include fields in nested groups that are inside of the
* group for which to find fields.
*
* @return array The array of JFormField objects in the field group.
*
* @since 11.1
*/
public function getGroup($group, $nested = false)
{
// Initialise variables.
$fields = array();
// Get all of the field elements in the field group.
$elements = $this->findFieldsByGroup($group, $nested);
// If no field elements were found return empty.
if (empty($elements))
{
return $fields;
}
// Build the result array from the found field elements.
foreach ($elements as $element)
{
// If the field is successfully loaded add it to the result array.
if ($field = $this->loadField($element, $group))
{
$fields[$field->id] = $field;
}
}
return $fields;
}
/**
* Method to get a form field markup for the field input.
*
* @param string $name The name of the form field.
* @param string $group The optional dot-separated form group path on which to find the field.
* @param mixed $value The optional value to use as the default for the field.
*
* @return string The form field markup.
*
* @since 11.1
*/
public function getInput($name, $group = null, $value = null)
{
// Attempt to get the form field.
if ($field = $this->getField($name, $group, $value))
{
return $field->input;
}
return '';
}
/**
* Method to get a form field markup for the field input.
*
* @param string $name The name of the form field.
* @param string $group The optional dot-separated form group path on which to find the field.
*
* @return string The form field markup.
*
* @since 11.1
*/
public function getLabel($name, $group = null)
{
// Attempt to get the form field.
if ($field = $this->getField($name, $group))
{
return $field->label;
}
return '';
}
/**
* Method to get the form name.
*
* @return string The name of the form.
*
* @since 11.1
*/
public function getName()
{
return $this->name;
}
/**
* Method to get the value of a field.
*
* @param string $name The name of the field for which to get the value.
* @param string $group The optional dot-separated form group path on which to get the value.
* @param mixed $default The optional default value of the field value is empty.
*
* @return mixed The value of the field or the default value if empty.
*
* @since 11.1
*/
public function getValue($name, $group = null, $default = null)
{
// If a group is set use it.
if ($group)
{
$return = $this->data->get($group . '.' . $name, $default);
}
else
{
$return = $this->data->get($name, $default);
}
return $return;
}
/**
* Method to load the form description from an XML string or object.
*
* The replace option works per field. If a field being loaded already exists in the current
* form definition then the behavior or load will vary depending upon the replace flag. If it
* is set to true, then the existing field will be replaced in its exact location by the new
* field being loaded. If it is false, then the new field being loaded will be ignored and the
* method will move on to the next field to load.
*
* @param string $data The name of an XML string or object.
* @param string $replace Flag to toggle whether form fields should be replaced if a field
* already exists with the same group/name.
* @param string $xpath An optional xpath to search for the fields.
*
* @return boolean True on success, false otherwise.
*
* @since 11.1
*/
public function load($data, $replace = true, $xpath = false)
{
// If the data to load isn't already an XML element or string return false.
if ((!($data instanceof JXMLElement)) && (!is_string($data)))
{
return false;
}
// Attempt to load the XML if a string.
if (is_string($data))
{
$data = JFactory::getXML($data, false);
// Make sure the XML loaded correctly.
if (!$data)
{
return false;
}
}
// If we have no XML definition at this point let's make sure we get one.
if (empty($this->xml))
{
// If no XPath query is set to search for fields, and we have a <form />, set it and return.
if (!$xpath && ($data->getName() == 'form'))
{
$this->xml = $data;
// Synchronize any paths found in the load.
$this->syncPaths();
return true;
}
// Create a root element for the form.
else
{
$this->xml = new JXMLElement('<form></form>');
}
}
// Get the XML elements to load.
$elements = array();
if ($xpath)
{
$elements = $data->xpath($xpath);
}
elseif ($data->getName() == 'form')
{
$elements = $data->children();
}
// If there is nothing to load return true.
if (empty($elements))
{
return true;
}
// Load the found form elements.
foreach ($elements as $element)
{
// Get an array of fields with the correct name.
$fields = $element->xpath('descendant-or-self::field');
foreach ($fields as $field)
{
// Get the group names as strings for ancestor fields elements.
$attrs = $field->xpath('ancestor::fields[@name]/@name');
$groups = array_map('strval', $attrs ? $attrs : array());
// Check to see if the field exists in the current form.
if ($current = $this->findField((string) $field['name'], implode('.', $groups)))
{
// If set to replace found fields remove it from the current definition.
if ($replace)
{
$dom = dom_import_simplexml($current);
$dom->parentNode->removeChild($dom);
}
else
{
unset($field);
}
}
}
// Merge the new field data into the existing XML document.
self::addNode($this->xml, $element);
}
// Synchronize any paths found in the load.
$this->syncPaths();
return true;
}
/**
* Method to load the form description from an XML file.
*
* The reset option works on a group basis. If the XML file references
* groups that have already been created they will be replaced with the
* fields in the new XML file unless the $reset parameter has been set
* to false.
*
* @param string $file The filesystem path of an XML file.
* @param string $reset Flag to toggle whether form fields should be replaced if a field
* already exists with the same group/name.
* @param string $xpath An optional xpath to search for the fields.
*
* @return boolean True on success, false otherwise.
*
* @since 11.1
*/
public function loadFile($file, $reset = true, $xpath = false)
{
// Check to see if the path is an absolute path.
if (!is_file($file))
{
// Not an absolute path so let's attempt to find one using JPath.
$file = JPath::find(self::addFormPath(), strtolower($file) . '.xml');
// If unable to find the file return false.
if (!$file)
{
return false;
}
}
// Attempt to load the XML file.
$xml = JFactory::getXML($file, true);
return $this->load($xml, $reset, $xpath);
}
/**
* Method to remove a field from the form definition.
*
* @param string $name The name of the form field for which remove.
* @param string $group The optional dot-separated form group path on which to find the field.
*
* @return boolean True on success.
*
* @since 11.1
*/
public function removeField($name, $group = null)
{
// Make sure there is a valid JForm XML document.
if (!($this->xml instanceof JXMLElement))
{
// TODO: throw exception.
return false;
}
// Find the form field element from the definition.
$element = $this->findField($name, $group);
// If the element exists remove it from the form definition.
if ($element instanceof JXMLElement)
{
$dom = dom_import_simplexml($element);
$dom->parentNode->removeChild($dom);
}
return true;
}
/**
* Method to remove a group from the form definition.
*
* @param string $group The dot-separated form group path for the group to remove.
*
* @return boolean True on success.
*
* @since 11.1
*/
public function removeGroup($group)
{
// Make sure there is a valid JForm XML document.
if (!($this->xml instanceof JXMLElement))
{
// TODO: throw exception.
return false;
}
// Get the fields elements for a given group.
$elements = &$this->findGroup($group);
foreach ($elements as &$element)
{
$dom = dom_import_simplexml($element);
$dom->parentNode->removeChild($dom);
}
return true;
}
/**
* Method to reset the form data store and optionally the form XML definition.
*
* @param boolean $xml True to also reset the XML form definition.
*
* @return boolean True on success.
*
* @since 11.1
*/
public function reset($xml = false)
{
unset($this->data);
$this->data = new JRegistry;
if ($xml)
{
unset($this->xml);
$this->xml = new JXMLElement('<form></form>');
}
return true;
}
/**
* Method to set a field XML element to the form definition. If the replace flag is set then
* the field will be set whether it already exists or not. If it isn't set, then the field
* will not be replaced if it already exists.
*
* @param object &$element The XML element object representation of the form field.
* @param string $group The optional dot-separated form group path on which to set the field.
* @param boolean $replace True to replace an existing field if one already exists.
*
* @return boolean True on success.
*
* @since 11.1
*/
public function setField(&$element, $group = null, $replace = true)
{
// Make sure there is a valid JForm XML document.
if (!($this->xml instanceof JXMLElement))
{
// TODO: throw exception.
return false;
}
// Make sure the element to set is valid.
if (!($element instanceof JXMLElement))
{
// TODO: throw exception.
return false;
}
// Find the form field element from the definition.
$old = &$this->findField((string) $element['name'], $group);
// If an existing field is found and replace flag is false do nothing and return true.
if (!$replace && !empty($old))
{
return true;
}
// If an existing field is found and replace flag is true remove the old field.
if ($replace && !empty($old) && ($old instanceof JXMLElement))
{
$dom = dom_import_simplexml($old);
$dom->parentNode->removeChild($dom);
}
// If no existing field is found find a group element and add the field as a child of it.
if ($group)
{
// Get the fields elements for a given group.
$fields = &$this->findGroup($group);
// If an appropriate fields element was found for the group, add the element.
if (isset($fields[0]) && ($fields[0] instanceof JXMLElement))
{
self::addNode($fields[0], $element);
}
}
else
{
// Set the new field to the form.
self::addNode($this->xml, $element);
}
// Synchronize any paths found in the load.
$this->syncPaths();
return true;
}
/**
* Method to set an attribute value for a field XML element.
*
* @param string $name The name of the form field for which to set the attribute value.
* @param string $attribute The name of the attribute for which to set a value.
* @param mixed $value The value to set for the attribute.
* @param string $group The optional dot-separated form group path on which to find the field.
*
* @return boolean True on success.
*
* @since 11.1
*/
public function setFieldAttribute($name, $attribute, $value, $group = null)
{
// Make sure there is a valid JForm XML document.
if (!($this->xml instanceof JXMLElement))
{
// TODO: throw exception.
return false;
}
// Find the form field element from the definition.
$element = &$this->findField($name, $group);
// If the element doesn't exist return false.
if (!($element instanceof JXMLElement))
{
return false;
}
// Otherwise set the attribute and return true.
else
{
$element[$attribute] = $value;
// Synchronize any paths found in the load.
$this->syncPaths();
return true;
}
}
/**
* Method to set some field XML elements to the form definition. If the replace flag is set then
* the fields will be set whether they already exists or not. If it isn't set, then the fields
* will not be replaced if they already exist.
*
* @param object &$elements The array of XML element object representations of the form fields.
* @param string $group The optional dot-separated form group path on which to set the fields.
* @param boolean $replace True to replace existing fields if they already exist.
*
* @return boolean True on success.
*
* @since 11.1
*/
public function setFields(&$elements, $group = null, $replace = true)
{
// Make sure there is a valid JForm XML document.
if (!($this->xml instanceof JXMLElement))
{
// TODO: throw exception.
return false;
}
// Make sure the elements to set are valid.
foreach ($elements as $element)
{
if (!($element instanceof JXMLElement))