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J3.x

Developing a MVC Component/Adding verifications

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< J3.x:Developing a MVC Component


This is a multiple-article series of tutorials on how to develop a Model-View-Controller Component for Joomla! Version Joomla 3.x.

Begin with the Introduction, and navigate the articles in this series by using the navigation box to the right (the Articles in this series).

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This is a multiple-article series of tutorials on how to develop a Model-View-Contoller Component for Joomla! Version Joomla 3.4.

Introduction

This tutorial is part of the Developing a MVC Component for Joomla! 3.2 tutorial. You are encouraged to read the previous parts of the tutorial before reading this.

See Form validation for some more general info on form validation (rules).

Verifying the form (client side)

Forms can be verified on the client side using javascript code.

In the admin/views/helloworld/tmpl/edit.php file, put these lines

admin/views/helloworld/tmpl/edit.php

<?php
/**
 * @package     Joomla.Administrator
 * @subpackage  com_helloworld
 *
 * @copyright   Copyright (C) 2005 - 2015 Open Source Matters, Inc. All rights reserved.
 * @license     GNU General Public License version 2 or later; see LICENSE.txt
 */
 
// No direct access
defined('_JEXEC') or die('Restricted access');
JHtml::_('behavior.formvalidation');?>
<form action="<?php echo JRoute::_('index.php?option=com_helloworld&layout=edit&id=' . (int) $this->item->id); ?>"
    method="post" name="adminForm" id="adminForm" class="form-validate">    <div class="form-horizontal">
        <fieldset class="adminform">
            <legend><?php echo JText::_('COM_HELLOWORLD_HELLOWORLD_DETAILS'); ?></legend>
            <div class="row-fluid">
                <div class="span6">
                    <?php foreach ($this->form->getFieldset() as $field): ?>
                        <div class="control-group">
                            <div class="control-label"><?php echo $field->label; ?></div>
                            <div class="controls"><?php echo $field->input; ?></div>
                        </div>
                    <?php endforeach; ?>
                </div>
            </div>
        </fieldset>
    </div>
    <input type="hidden" name="task" value="helloworld.edit" />
    <?php echo JHtml::_('form.token'); ?>
</form>

You may have noted that the html form contained in the admin/views/helloworld/tmpl/edit.php file now has the form-validate css class. And that we added a JHTML::_('behavior.formvalidation'); call to tell Joomla to use its javascript form validation.

Modify the admin/models/forms/helloworld.xml file to indicate that the greeting field has to be verified:

<?xml version="1.0" encoding="utf-8"?>
<form				addrulepath="/administrator/components/com_helloworld/models/rules">	<fieldset>
		<field
				name="id"
				type="hidden"
				/>
		<field
				name="greeting"
				type="text"
				label="COM_HELLOWORLD_HELLOWORLD_GREETING_LABEL"
				description="COM_HELLOWORLD_HELLOWORLD_GREETING_DESC"
				size="40"
				class="inputbox validate-greeting"				validate="greeting"				required="true"				default=""
				/>
	</fieldset>
</form>

Note for the moment that the css class is now "inputbox validate-greeting" and that the attribute required is set to true. It means that this field is required and has to be verified by a handler of the form validator framework of Joomla

With your favorite file manager and editor put a file admin/models/forms/helloworld.js containing

admin/models/forms/helloworld.js

jQuery(function() {
    document.formvalidator.setHandler('greeting',
        function (value) {
            regex=/^[^0-9]+$/;
            return regex.test(value);
        });
});

It adds a handler to the form validator of Joomla for fields having the "validate-greeting" css class. Each time the greeting field is modified, the handler will be executed to verify its validity (no digits).

The final step is to verify the form when the save button is clicked.

With your favorite file manager and editor put a file admin/views/helloworld/submitbutton.js containing

admin/views/helloworld/submitbutton.js

Joomla.submitbutton = function(task)
{
	if (task == '')
	{
		return false;
	}
	else
	{
		var isValid=true;
		var action = task.split('.');
		if (action[1] != 'cancel' && action[1] != 'close')
		{
			var forms = $$('form.form-validate');
			for (var i=0;i<forms.length;i++)
			{
				if (!document.formvalidator.isValid(forms[i]))
				{
					isValid = false;
					break;
				}
			}
		}
 
		if (isValid)
		{
			Joomla.submitform(task);
			return true;
		}
		else
		{
			alert(Joomla.JText._('COM_HELLOWORLD_HELLOWORLD_ERROR_UNACCEPTABLE',
			                     'Some values are unacceptable'));
			return false;
		}
	}
}

This function will verify that all forms which have the "form-validate" css class are valid. Note that it will display an alert message translated by the Joomla framework.

The HelloWorldViewHelloWorld view class has to be modified to use these javascript files:

admin/views/helloworld/view.html.php

<?php
/**
 * @package     Joomla.Administrator
 * @subpackage  com_helloworld
 *
 * @copyright   Copyright (C) 2005 - 2015 Open Source Matters, Inc. All rights reserved.
 * @license     GNU General Public License version 2 or later; see LICENSE.txt
 */
 
// No direct access to this file
defined('_JEXEC') or die('Restricted access');
 
/**
 * HelloWorld View
 *
 * @since  0.0.1
 */
class HelloWorldViewHelloWorld extends JViewLegacy
{
	/**
	 * View form
	 *
	 * @var         form
	 */
	protected $form = null;
 
	/**
	 * Display the Hello World view
	 *
	 * @param   string  $tpl  The name of the template file to parse; automatically searches through the template paths.
	 *
	 * @return  void
	 */
	public function display($tpl = null)
	{
		// Get the Data
		$this->form = $this->get('Form');
		$this->item = $this->get('Item');
		$this->script = $this->get('Script'); 
		// Check for errors.
		if (count($errors = $this->get('Errors')))
		{
			JError::raiseError(500, implode('<br />', $errors));
 
			return false;
		}
 
 
		// Set the toolbar
		$this->addToolBar();
 
		// Display the template
		parent::display($tpl);
 
		// Set the document
		$this->setDocument();
	}
 
	/**
	 * Add the page title and toolbar.
	 *
	 * @return  void
	 *
	 * @since   1.6
	 */
	protected function addToolBar()
	{
		$input = JFactory::getApplication()->input;
 
		// Hide Joomla Administrator Main menu
		$input->set('hidemainmenu', true);
 
		$isNew = ($this->item->id == 0);
 
		if ($isNew)
		{
			$title = JText::_('COM_HELLOWORLD_MANAGER_HELLOWORLD_NEW');
		}
		else
		{
			$title = JText::_('COM_HELLOWORLD_MANAGER_HELLOWORLD_EDIT');
		}
 
		JToolBarHelper::title($title, 'helloworld');
		JToolBarHelper::save('helloworld.save');
		JToolBarHelper::cancel(
			'helloworld.cancel',
			$isNew ? 'JTOOLBAR_CANCEL' : 'JTOOLBAR_CLOSE'
		);
	}
	/**
	 * Method to set up the document properties
	 *
	 * @return void
	 */
	protected function setDocument() 
	{
		$isNew = ($this->item->id < 1);
		$document = JFactory::getDocument();
		$document->setTitle($isNew ? JText::_('COM_HELLOWORLD_HELLOWORLD_CREATING') :
                JText::_('COM_HELLOWORLD_HELLOWORLD_EDITING'));
		$document->addScript(JURI::root() . $this->script);		$document->addScript(JURI::root() . "/administrator/components/com_helloworld"		                                  . "/views/helloworld/submitbutton.js");		JText::script('COM_HELLOWORLD_HELLOWORLD_ERROR_UNACCEPTABLE');	}
}

This view now

  • verifies if the model has no error;
  • adds two javascript files;
  • injects javascript translation using the Joomla JText::script function.

The final step is to implement a getScript function in the HelloWorldModelHelloWorld model:

admin/models/helloworld.php

<?php
/**
 * @package     Joomla.Administrator
 * @subpackage  com_helloworld
 *
 * @copyright   Copyright (C) 2005 - 2015 Open Source Matters, Inc. All rights reserved.
 * @license     GNU General Public License version 2 or later; see LICENSE.txt
 */
 
// No direct access to this file
defined('_JEXEC') or die('Restricted access');
 
/**
 * HelloWorld Model
 *
 * @since  0.0.1
 */
class HelloWorldModelHelloWorld extends JModelAdmin
{
	/**
	 * Method to get a table object, load it if necessary.
	 *
	 * @param   string  $type    The table name. Optional.
	 * @param   string  $prefix  The class prefix. Optional.
	 * @param   array   $config  Configuration array for model. Optional.
	 *
	 * @return  JTable  A JTable object
	 *
	 * @since   1.6
	 */
	public function getTable($type = 'HelloWorld', $prefix = 'HelloWorldTable', $config = array())
	{
		return JTable::getInstance($type, $prefix, $config);
	}
 
	/**
	 * Method to get the record form.
	 *
	 * @param   array    $data      Data for the form.
	 * @param   boolean  $loadData  True if the form is to load its own data (default case), false if not.
	 *
	 * @return  mixed    A JForm object on success, false on failure
	 *
	 * @since   1.6
	 */
	public function getForm($data = array(), $loadData = true)
	{
		// Get the form.
		$form = $this->loadForm(
			'com_helloworld.helloworld',
			'helloworld',
			array(
				'control' => 'jform',
				'load_data' => $loadData
			)
		);
 
		if (empty($form))
		{
			return false;
		}
 
		return $form;
	}
	/**	 * Method to get the script that have to be included on the form	 *	 * @return string	Script files	 */	public function getScript() 	{		return 'administrator/components/com_helloworld/models/forms/helloworld.js';	}	/**
	 * Method to get the data that should be injected in the form.
	 *
	 * @return  mixed  The data for the form.
	 *
	 * @since   1.6
	 */
	protected function loadFormData()
	{
		// Check the session for previously entered form data.
		$data = JFactory::getApplication()->getUserState(
			'com_helloworld.edit.helloworld.data',
			array()
		);
 
		if (empty($data))
		{
			$data = $this->getItem();
		}
 
		return $data;
	}
}

Verifying the form (server side)

Verifying the form on the server side is done by inheritance of JControllerForm class. We have specified in the admin/models/forms/helloworld.xml file that the validate server function will use a greeting.php file.

With your favorite file manager and editor, put a admin/models/rules/greeting.php file containing:

admin/models/rules/greeting.php

<?php
/**
 * @package     Joomla.Administrator
 * @subpackage  com_helloworld
 *
 * @copyright   Copyright (C) 2005 - 2015 Open Source Matters, Inc. All rights reserved.
 * @license     GNU General Public License version 2 or later; see LICENSE.txt
 */
 
// No direct access to this file
defined('_JEXEC') or die('Restricted access');
 
/**
 * Form Rule class for the Joomla Framework.
 */
class JFormRuleGreeting extends JFormRule
{
	/**
	 * The regular expression.
	 *
	 * @access	protected
	 * @var		string
	 * @since	2.5
	 */
	protected $regex = '^[^0-9]+$';
}

Note there is no function here - this is inherited from JFormRule (located in: libraries/joomla/form /rule.php). All that is needed is the regex string to test against.

Packaging the component

Content of your code directory

Create a compressed file of this directory archive or directly download the archive and install it using the extension manager of Joomla. You can add a menu item of this component using the menu manager in the backend.

helloworld.xml

<?xml version="1.0" encoding="utf-8"?>
<extension type="component" version="3.2.0" method="upgrade">
 
	<name>COM_HELLOWORLD</name>
	<!-- The following elements are optional and free of formatting constraints -->
	<creationDate>January 2014</creationDate>
	<author>John Doe</author>
	<authorEmail>john.doe@example.org</authorEmail>
	<authorUrl>http://www.example.org</authorUrl>
	<copyright>Copyright Info</copyright>
	<license>License Info</license>
	<!--  The version string is recorded in the components table -->
	<version>0.0.11</version>	<!-- The description is optional and defaults to the name -->
	<description>COM_HELLOWORLD_DESCRIPTION</description>
 
	<install> <!-- Runs on install -->
		<sql>
			<file driver="mysql" charset="utf8">sql/install.mysql.utf8.sql</file>
		</sql>
	</install>
	<uninstall> <!-- Runs on uninstall -->
		<sql>
			<file driver="mysql" charset="utf8">sql/uninstall.mysql.utf8.sql</file>
		</sql>
	</uninstall>
	<update> <!-- Runs on update; New since J2.5 -->
		<schemas>
			<schemapath type="mysql">sql/updates/mysql</schemapath>
		</schemas>
	</update>
 
	<!-- Site Main File Copy Section -->
	<!-- Note the folder attribute: This attribute describes the folder
		to copy FROM in the package to install therefore files copied
		in this section are copied from /site/ in the package -->
	<files folder="site">
		<filename>index.html</filename>
		<filename>helloworld.php</filename>
		<filename>controller.php</filename>
		<folder>views</folder>
		<folder>models</folder>
	</files>
 
        <languages folder="site/language">
		<language tag="en-GB">en-GB/en-GB.com_helloworld.ini</language>
        </languages>
 
	<media destination="com_helloworld" folder="media">
		<filename>index.html</filename>
		<folder>images</folder>
	</media>
 
	<administration>
		<!-- Administration Menu Section -->
		<menu link='index.php?option=com_helloworld' img="../media/com_helloworld/images/tux-16x16.png">COM_HELLOWORLD_MENU</menu>
		<!-- Administration Main File Copy Section -->
		<!-- Note the folder attribute: This attribute describes the folder
			to copy FROM in the package to install therefore files copied
			in this section are copied from /admin/ in the package -->
		<files folder="admin">
			<!-- Admin Main File Copy Section -->
			<filename>index.html</filename>
			<filename>helloworld.php</filename>
			<filename>controller.php</filename>
			<!-- SQL files section -->
			<folder>sql</folder>
			<!-- tables files section -->
			<folder>tables</folder>
			<!-- models files section -->
			<folder>models</folder>
			<!-- views files section -->
			<folder>views</folder>
			<!-- controllers files section -->
			<folder>controllers</folder>
		</files>
		<languages folder="admin/language">
        		<language tag="en-GB">en-GB/en-GB.com_helloworld.ini</language>
                        <language tag="en-GB">en-GB/en-GB.com_helloworld.sys.ini</language>
		</languages>
	</administration>
 
</extension>


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