Model Validation

How can I perform cakephp Model validation using ajax & shows error message.

I have already set the error message in controller but not shown in view.

$this->Candidateprofile->set($this->data);

if($this->Candidateprofile->validates())

{

$this->Candidateprofile->create();

if($this->Candidateprofile->saveAll($this->data)) {

}else{

$invalidFields=$this->Candidateprofile->invalidFields();

$this->set('invalidFields',$invalidFields);

}

}else{

$invalidFields=$this->Candidateprofile->invalidFields();

$this->set('invalidFields',$invalidFields);

}

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