jquery - Joomla ajax call onclick event to call helper method in component -

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My case is low: I need to call a php helper method in the view / edit.php of my component in order To validate the value of a textbox against the database, I have read a lot of threads about Ajax calls within Joomla, but it has not yet managed to work.

In helper.php the method is MyClass ::

View / Edit I have it:

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