CBC_5_CarSearchFormController.js

({
    
    doInit : function(component, event, helper) {
		var createBoatRecord = $A.get("e.force:createRecord");
        if(createBoatRecord){ //check if this event is available or not
            component.set("v.showNew", true);
        } else{
            component.set("v.showNew", false);
        }
	},
    
	createRecord : function(component, event, helper) {
		var createCarRecord = $A.get("e.force:createRecord");
        
        //getting selected picklist value
        var carTypeId = component.find("carType").get("v.value");
        carTypeId = carTypeId.length != 0?carTypeId:null;
        //This line sets parameter value to system event
        createCarRecord.setParams({
            "entityApiName": "Car__c",
            "defaultFieldValues": {
                "Car_Type__c" : carTypeId
            }
        });
        //This line fires system event
        createCarRecord.fire();
	}, 
})