Hi All
I've a question about how to delete a session variable when the user
navigates away from a page.
I use a session variable to persist an id that the user has selected
from a drop down list. This id is then used as find conditions in
subsequent operation.
It works like a dream; but when the user navigates away from this page
to another part of the application, and then comes back some time
later, the variable is still present and so I get the "special case"
behaviour instead of the default behaviour.
I could put a session->delete in every other controller; but that's
not very robust as I'm bound to forget when creating new controllers.
Does anyone know of a procedure for deleting session variables when
navigating away from a page?
Or maybe I should be using session variables for this at all.
Here's some code from my controller index method showing the session
variable being set or read:
function index() {
$displaykpi = null; // The specific kpi to display the
levels for
//
// If something was passed to this method then it must be a
request to
// display a single KPI rather than the entire list
//
if (!empty($this->data))
{
$displaykpi = array('kpi_id' => $this->data['KpiLevels']
['kpi_id']);
//
// Store the KPI in the session and set up pagination to
only
// display the KPI we've selected.
//
$this->Session->write('displaykpi', $displaykpi);
}
else
{
//
// Check is something is set in the session
//
if ($this->Session->check('displaykpi'))
{
$displaykpi = $this->Session->read('displaykpi'); ##
We only want to do this if user hasn't been
## somewhere else in the app.
}
}
//
// If we're working on a specific KPI only paginate that KPI
// otherwise paginate all of them
//
if ($displaykpi)
{
$kpiLevels = $this->paginate($displaykpi);
}
else
{
$kpiLevels = $this->paginate();
}
//
// Get all the KPI's so we can give the user the option to
choose just
// one KPI to display
//
$allkpis = $this->KpiLevel->Kpi->find('list');
$this->set('kpiLevels', compact('kpiLevels', 'allkpis'));
}
Here's my index.ctp (part of) showing the form that's used to pass the
kpi_id back to index.ctp
<?php
$javascript->codeBlock('function getKPI(f) {f.form.submit(); } ',
array('inline' => false));
?>
<div class="kpiLevels index">
<h2><?php __('KpiLevels');?></h2>
<div class="kpilevels form">
<?php
//
// Create a form to allow the user to select which specific
KPI to display
//
$allkpis = $kpiLevels['allkpis'];
echo $form->create('KpiLevels', array('action' => 'index'));
echo $form->label('kpi_id', 'Select a KPI to display');
echo $form->select('kpi_id', $kpiLevels['allkpis'], null, array
('onChange' => 'getKPI(this)'));
echo $form->end();
?>
</div>
The rest of the index.ctp is box standard pagination code.
Hope someone can help
Regards
David
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