compute.bind

Parameters

1. eventType {String}

   The event to bind this handler to. The only event type that computes emit is change.

2. handler {function(Object, Object, Object)}

   The handler to call when the event happens. The handler should have three parameters:

   • event is the event object.
   • newVal is the newly-computed value of the compute.
   • oldVal is the value of the compute before it changed.

   bind lets you listen to a compute to know when it changes. It works just like can.Map's bind:

   var tally = can.compute(0);
   tally.bind('change', function(ev, newVal, oldVal) {
       console.log('The tally is now at ' + newVal + '.');
   });
   
   tally(tally() + 5); // The log reads:
                       // 'The tally is now at 5.'