Sample Code:


Component:

1. <aura:component >  
2.       
3.     <div class=“slds-box slds-theme_default”>  
4.           
5.         <lightning:recordForm  objectApiName = “Opportunity”  
6.                                layoutType = “Full”   
7.                                columns = “2”  
8.                                onsuccess = “{! c.handleSuccess }”/>  
9.               
10.     </div>  
11.       
12. </aura:component>  

Component Controller:

1. ({  
2.       
3.     handleSuccess : function(component, event, helper) {  
4.           
5.         var params = event.getParams();  
6.         alert(params.id);  
7.           
8.     }  
9.       
10. })  

Output: