How to validate data before saving in lighting:recordForm?

How to validate data before saving in lighting:recordForm?

Component:

<aura:component implements=”force:appHostable” >

    <div class=”slds-box slds-theme_default”>        
        <lightning:recordForm recordId=”001f200001XrzFQAAZ” 
                              objectApiName=”Account”
                              layoutType=”Full” 
                              mode=”Edit” 
                              onsubmit=”{!c.saveRec}”/>        
    </div>
    
</aura:component>


Controller:


({
saveRec : function(component, event, helper) {
        var eventFields = event.getParam(“fields”);
        var field = ‘NumberOfEmployees’;
        if (eventFields.hasOwnProperty(field)) {
            if ( !eventFields.NumberOfEmployees ) {            
                event.preventDefault();
                var toastEvent = $A.get(“e.force:showToast”);
                toastEvent.setParams({
                    “title”: “Error!!!”,
                    “message”: “Please fill Employees field”,
                    “type”: “error”
                });
                toastEvent.fire();
            }
        }
}
})


Output:

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