TYPO3 Ext. cal: adapting the search form - typo3

Question

Per default the search form contains the following inputs:
Instead of the two Inputs "Startdatum" and "Enddatum" i want a selectbox with a month option.
In
typo3conf\ext\cal\Resources\Private\Templates\v2\search_event.tmpl
there are only the post parameters start_day and end_date for the search.
How to realize am month selextbox if i only can select and post a month value ?
Must i make changes here?
typo3conf\ext\cal\Classes\View\SearchViews.php
Can i realize this with an own cal extend extension?

Answer 1

Given you use content element of type plugin with view set to 'list' and add your own form select for month, which generates requests with parameter like
?tx_cal_controller[month]=08
then you can manipulate list results with a typoscript condition to show only events from requested month of current year:
[globalVar = GP:tx_cal_controller|month >0]
plugin.tx_cal_controller.view.list.useCustomStarttime = 1
plugin.tx_cal_controller.view.list.useCustomEndtime = 1
plugin.tx_cal_controller.view.list.customStarttimeRelativeToGetdate = 1
plugin.tx_cal_controller.view.list.customEndtimeRelativeToGetdate = 1
plugin.tx_cal_controller.view.list.starttime = monthstart
plugin.tx_cal_controller.view.list.endtime = monthend
[global]
To use your own category filter for list view, you need to adapt/extend class \TYPO3\CMS\Cal\Controller\Controller::initConfigs() to invoke a parameter like
?tx_cal_controller[category]=2
into global configuration like
/**
* Init configurations
* Change category mode in listview, if category given in GET params
* Used for category filter by selection
*/
public function initConfigs() {
parent::initConfigs();
if ($this->piVars['category'] && $this->conf ['view'] === 'list') {
$this->conf ['view.'] ['categoryMode'] = 4;
$this->conf ['view.'] ['category'] = $this->piVars['category'];
}
}
For a working filter of event owner I have no example.