why recaptcha not works on joomla 3.6.5 ? JHtml::_('behavior.keepalive');
JHtml::_('behavior.formvalidation');
$user=JFactory::getUser();
if($user->guest){
JPluginHelper::importPlugin('captcha');
$dispatcher = JDispatcher::getInstance();
$captcha = JCaptcha::getInstance('recaptcha');
$dispatcher->trigger('onInit','dynamic_recaptcha_1'); }
<div class="control-group"><div class="controls"><div id="dynamic_recaptcha_1"></div></div></div>
<div>
<button type="submit" class="validate"> <?php echo JText::_('JREGISTER');?> </button>
<input type="hidden" name="option" value="com_users" />
<input type="hidden" name="task" value="registration.register" />
<?php echo JHtml::_('form.token'); $html = $captcha->display(null, 'dynamic_recaptcha_1', 'required'); ?>
</div>