lightingAndVisualforce.js

/////////////////////////////////////////////////////////////////////////////////////////
// Lightning component code to listen for post message commands from
// visualforce pages. It would be very very VERY helpful if this functionality
// was provided by the core lightning ui code.
/////////////////////////////////////////////////////////////////////////////////////////

({
    setupLightningConverterListener: function(){
      var listener = function(event) {
          if(event.data.action === 'toast'){
              this.processToast(event.data)
          }
          else if(event.data.action === 'navigateToSObject'){
              this.processNavigateToSObject(event.data)
          }
      }.bind(this);
      window.addEventListener('message', listener);
    },
    
    processToast: function(data){
       var toastEvent = $A.get("e.force:showToast");
        toastEvent.setParams({
            "title": event.data.title,
            "message": event.data.message
        });
        toastEvent.fire(); 
    },
    
    processNavigateToSObject: function(data){
        var navEvt = $A.get("e.force:navigateToSObject");
        navEvt.setParams({
            "recordId": event.data.recordId,
            "slideDevName": event.data.slideDevName //"related"
        });
        navEvt.fire();
    }
})

/////////////////////////////////////////////////////////////////////////////////////////
// Visualforce javascript code that communicates with the lightning component for display
// of toast messages and SObject Navigation
/////////////////////////////////////////////////////////////////////////////////////////
<apex:page sidebar="false" showheader="false">

<!-- UI Code and whatnot here -->

<script>

//Sample visualforce javascript that interacts with the proxy lightning component.
//If we could support these postmessage commands in core lightning and eliminate the need
//for our proxy lightning component that would be ideal.

//Display post message
parent.postMessage({action:'toast', title:"Success", message:"Your email message has been sent."});

//Navigate to SObject
parent.postMessage({action:'navigateToSObject', recordId: someRecordId, slideDevName:"related"});

</script>
</apex:page>