Here??™s an example of such a link:
http://localhost/tshirtshop/index.php?DepartmentId=3
When clicking a department??™s link, the selected department will be displayed using a different CSS style in the list
(see Figure 4-15).
Figure 4-15. Selecting a department
It is important to understand how the Smarty template file (presentation/templates/departments_list.tpl)
and the plug-in file (presentation/smarty_plugins/function.load_presentation_object.php) work
together to generate the list of departments and to use the correct style for the currently selected one.
The processing starts at function.load_presentation_object.php, which is included in the store_
front.tpl file. The first line in departments_list.tpl loads the DepartmentList presentation object
through the Smarty plug-in:
{load_presentation_object filename="departments_list" assign="obj"}
The smarty_function_load_presentation_object() plug-in function creates and initializes
a DepartmentsList object (this class is included in presentation/departments_list.php), which is
then assigned to the obj variable accessible from the Smarty design template file:
// Plug-in functions inside plug-in files must be named: smarty_type_name
function smarty_function_load_presentation_object($params, $smarty)
{
require_once PRESENTATION_DIR . $params['filename'] . '.php';
$className = str_replace(' ', '',
ucfirst(str_replace('_', ' ',
$params['filename'])));
// Create presentation object
$obj = new $className();
CHAPTER 4 ?– CREATING THE PRODUCT CATALOG: PART 1 106
if (method_exists($obj, 'init'))
{
$obj->init();
}
// Assign template variable
$smarty->assign($params['assign'], $obj);
}
The init() method in DepartmentsList populates a public member of the class ($mDepartments) with an
array containing the list of departments and another public member containing the index of the currently selected
department ($mSelectedDepartment).
Pages:
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191