It would be helpful if you can give more details of where exactly are
you having problems: can you capture the event? can you make the ajax
request and send the data to the controller? can you save the data?
A straightforward way could be adding this to your view:
<?= $javascript->codeBlock(<<<EOD
$('ControllerTextareaid').observe('blur',function() {
new Ajax.Request('/controller/savetextarea', {
parameters: Form.serializeElements([$('ControllerId'),$
('ControllerTextareaid')])
});
});
EOD
); ?>
Note that this sends only the id and the textareafields.
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