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I had tried to follow this solution but it does not seem to work for lightning:inputField. Basically I want to stop negative values from being entered in the field. I have tried the solutions below but it doesn't seem to work. Is it possible to create validations on inputFields?

  <span onkeypress={!c.checkValue}">
  <lightning:inputField fieldName="Withdrawal_Amount__c" aura:id"wAmount" variant="label-hidden"/>
  </span>


 checkValue : function(component, event, helper){
      if(!((event.keyCode > 95 && event.keyCode < 106)
  || (event.keyCode > 47 && event.keyCode < 58) 
  || event.keyCode == 8)) {
    return false;
  }
}

Or:

<lightning:inputField fieldName="Withdrawal_Amount__c" aura:id"wAmount" 
variant="label-hidden" onchange="validity.valid||(value='');"/>

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