Archived:How to add custom filters to components

This page has been archived. This page contains information for an unsupported Joomla! version or is no longer relevant. It exists only as a historical reference, it will not be improved and its content may be incomplete and/or contain broken links.

Overview

This how-to is intended to give a decent description on how to add dropdown form elements to the backend admin page for a component. I worked out the steps primarily on my own by dissecting/replicating the Banners component. In particular, the 'banners' section of com_banners - not! to be confused with 'banner').

This tutorial was built on code tested in Joomla 1.7 only.

In general, the process of adding these fields breaks down into the following steps:

• Creating the class that will generate the form element
• Adapting the view to display the form element
• Adapting the model to retrieve data from DB & to set submission values in the Joomla 'state'

Extend JFormFieldList (models / fields / fieldname.php)

Frequently your filter fields will be very basic; probably simply a dropdown list of one of the columns being displayed on the current page. Regardless, you will need to create your own field element. This really isn't a big deal - this file will probably be less than 70 lines, including comments. The code below will generate the dropdown element to filter by companies. For more information and complex examples on creating this class see Creating_a_custom_form_field_type.

My 'companies' dropdown element:

<?php

defined('JPATH_BASE') or die;

jimport('joomla.html.html');
jimport('joomla.form.formfield');
jimport('joomla.form.helper');
JFormHelper::loadFieldClass('list');

/**
 * Custom Field class for the Joomla Framework.
 *
 * @package		Joomla.Administrator
 * @subpackage	        com_my
 * @since		1.6
 */
class JFormFieldMyCompany extends JFormFieldList
{
	/**
	 * The form field type.
	 *
	 * @var		string
	 * @since	1.6
	 */
	protected $type = 'MyCompany';

	/**
	 * Method to get the field options.
	 *
	 * @return	array	The field option objects.
	 * @since	1.6
	 */
	public function getOptions()
	{
		// Initialize variables.
		$options = array();

		$db	= JFactory::getDbo();
		$query	= $db->getQuery(true);

		$query->select('id As value, name As text');
		$query->from('#__my_companies AS a');
		$query->order('a.name');
		$query->where('state = 1');

		// Get the options.
		$db->setQuery($query);

		$options = $db->loadObjectList();

		// Check for a database error.
		if ($db->getErrorNum()) {
			JError::raiseWarning(500, $db->getErrorMsg());
		}

		return $options;
	}
}

Obviously, there is only one section here that needs to be customized:

		$query->select('id As value, name As text');
		$query->from('#__my_companies AS a');
		$query->order('a.name');
		$query->where('state = 1');

Change the database name and adjust the sql as necessary. This will produce the text and values for the select element options. I highly recommend not changing the value and text names. Although I did not test this theory, it seems likely that ancestor classes are expecting these names as keys in the resulting array.

Modify Model (models / zzz.php)

In your model you have to include these two functions:

protected function getListQuery(){
		$db = JFactory::getDBO();
		$query = $db->getQuery(true);
                $query->select('id As value, name As text');
		$query->from('#__my_companies AS a');
		$query->order('a.name');
		$query->where('state = 1');

		
		// Filter
		$search = $this->getState('filter.search');
		if (!empty($search)) {
			$query->where('(a.name LIKE '.$search.')');
		}
		
		return $query;
	}
	
	/**
	 * Method to auto-populate the model state.
	 *
	 * Note. Calling getState in this method will result in recursion.
	 *
	 * @since	1.6
	 */
	protected function populateState($ordering = null, $direction = null)
	{
		// Initialise variables.
		$app = JFactory::getApplication('administrator');
	
		// Load the filter state.
		$search = $this->getUserStateFromRequest($this->context.'.filter.search', 'filter_search');
		$this->setState('filter.search', $search);
	
		$state = $this->getUserStateFromRequest($this->context.'.filter.state', 'filter_state', '', 'string');
		$this->setState('filter.state', $state);
	
		// List state information.
		parent::populateState('a.name', 'asc');
	}

Modify View (views / zzz / view.html.php)

In you view class, you have to set the state, like this:

                $this->items		= $this->get('Items');
		$this->pagination	= $this->get('Pagination');
                //Add the state...
		$this->state		= $this->get('State');

Modify Template (views / zzz / tmpl / default.php)

In your template file, remember to include the html form to filter.

<div class="filter-search fltlft">
	<label class="filter-search-lbl" for="filter_search"><?php echo JText::_('JSEARCH_FILTER_LABEL'); ?></label>
	<input type="text" name="filter_search" id="filter_search" value="<?php echo $this->escape($this->state->get('filter.search')); ?>" title="<?php echo JText::_('COM_MYCOMPANY_SEARCH_IN_TITLE'); ?>" />
	<button type="submit"><?php echo JText::_('JSEARCH_FILTER_SUBMIT'); ?></button>
	<button type="button" onclick="document.id('filter_search').value='';this.form.submit();"><?php echo JText::_('JSEARCH_FILTER_CLEAR'); ?></button>
</div>

Contributors

Javier Constanzo

Doub1ejack