Question

How can i put an onchange function in this JHTML?

<?php
echo JHTML::_('calendar', $this->row->dates, 'dates', 'dates', '%Y-%m-%d',
               array('class' => 'inputbox required validate-date') );
?>

I imagine it would be something like this but it breaks the calendar code:

<?php 
echo JHTML::_('calendar', $this->row->dates, 'dates', 'dates', '%Y-%m-%d',
              'onchange=\"thisfunction(this.form)\"', array('class' => 'inputbox required validate-date') ); 
?>

Answer 1

JHTML::_('calendar'... is actually calling JHTML::calendar passing your parameters. So if you take a look at the API you’ll find:

@param   array   $attribs  Additional HTML attributes

This implies that your 6th param could be a array with additional HTML attributes. So you could just pass onchange in that array like:

echo JHTML::_('calendar', null, 'dates', 'dates', '%Y-%m-%d',
              array(
                    'class' => 'inputbox required validate-date',
                    'onchange' => 'thisfunction(this.form)'
              ));