[Solved] Check Username or Password Availability Using AJAX on Codeigniter

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You passed username from jQuery with username: $('#userId').val() not userId

Try following with $this->input->post('username')

$username = strtolower(trim($this->input->post('username')));

Or change posted data index from jQuery: username to userId

userId: $('#userId').val()

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solved Check Username or Password Availability Using AJAX on Codeigniter