Social Engine provides an easy way for showing modal windows for users. Some example for its uses are the following:
- Confirmation windows
- Notification windows with Timeout
- Taking a simple input on the fly, or even showing a whole form.
Modal Windows in SocialEngine 4 are created using mootools’s plugin “smoothbox”. Simply a modal window here is just an iframe, displaying a view as a result of calling a specific action in a controller (see Controllers). Let’s examine what happens when you try to delete an activity.
If you look at the html tag of the delete link you’ll find that it looks like the following:
<a href=”/activity/index/delete/action_id/126″ class=”smoothbox”>Delete</a>
Any anchor <a> tag that is given a class attribute with value “smoothbox”, opens the href link in a modal window (the i-frame), instead of transferring the whole page to it. This very much simulates an Ajax request with the least effort. Let’s inspect the href value to see where it leads:
So head up to this action. The first few lines in the action are just to check if the user is allowed to perform the delete operation. Also notice that the same method is invoked for both, deleting an activity (AKA action) or deleting a comment on an activity. Let’s focus this time on lines concerned with deleting the activity itself. Go for the line that say:
if (!$this->getRequest()->isPost()) return;
What happens here is that the action checks if it is invoked by a POST request (that request that takes place when you submit a form of type=post), if it is not a post request, the action just returns at this point, causing the default view for this action (delete.tpl) to render (more info on Controllers). Notice the variable passed to the view (before return) carrying the action/activity Id, which in our example is 126.
$this->view->action_id = $action_id = $this->_getParam(‘action_id’, null);
If you open that view (delete.tpl), you’ll find a form of type=post just as expected. It contains the confirmation message to display:
Are you sure that you want to delete this activity item and all of its comments? This action cannot be undone
Form elements include:
- A hidden field carrying the action Id passed from the view
- A submit button.
- A “Cancel” link.
Cancel link just calls the instance of smoothbox in the parent window and closes it.
On submitting the form, the same action handles the request, but this time it bypasses the condition checking if it’s not a POST request (since the action is called by submitting the form). The lines after that condition just check again for further permissions, then the actual deletion takes place. We’re not to worry here about the actual deletion process, this guide is only concerned with the modal window itself and how it works. So After deleting:
$this->view->status = true;
$this->view->message = Zend_Registry::get(‘Zend_Translate’)->_(‘This activity item has been removed.’);
$this->view->smoothboxClose = true;
The status of the operation is set to true and passed to the view to indicate success, along with the success message to display. Also a flag (smoothboxClose) is set to true to tell the view to close the smoothbox. Finally the script renders “deletedItem.tpl”
I’ll break up deletedItem.tpl into 3 parts.
parent.$(‘activity-item-<?php echo $this->action_id ?>’).destroy();
To further simulate the ajax request, after the activity item has been deleted it should be removed from the page. The above line simply does that by getting the HTML element containing that activity using its Id and removes it. The above translates to parent.$(‘activity-item-126’).destroy();
}, <?php echo ( $this->smoothboxClose === true ? 1000 : $this->smoothboxClose ); ?>);
parent.Smoothbox.close() is invoked after 1000 ms only if smoothboxClose passed from deleteAction was set to true. That is to allow enough time for the user to read the success message before hiding it.
<?php echo $this->message ?>
This shows the success message passed from deleteAction().
Here is another drawing for you