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How to add jQuery Datepicker option which accepts a function as an argument

I have added a date_popup field to a form :

$form['arrival_date'] = [   '#type'                => 'date_popup',   '#title'               => t('Arrival date'),   '#date_format'         => 'd/m/Y',   '#date_year_range'     => '0:+1',   '#date_label_position' => 'none',   '#default_value'       => '',   '#size'                => '10', ];

I want to add an option to run a function using the onClose option so my js is :

(function ($) {    Drupal.behaviors.ios2 = {     attach: function (context, settings) {       $('#edit-arrival-date-datepicker-popup-1').datepicker('option', {         onClose: function (date) {           // date will have the new date or empty string if no date           // has been selected.           alert(date);           // Do something         }       });     }   };  })(jQuery);

However the onClose event never executes. If I remove the ‘option’ argument thus :

$('#edit-arrival-date-datepicker-popup-1').datepicker({

it does work, but my suspicion is that it is replacing the datepicker with a new one, rather than altering the existing options.

This article was republished from its original source.
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How to add jQuery Datepicker option which accepts a function as an argument

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