ko.bindingHandlers.if.update function was removed in KnockoutJS 3.1?

Question

I wrote a custom binding that will perform like if binding at the first, and work as visible binding on the next.

ko.bindingHandlers.visibleIf = {
   init: function(element, valueAccessor, allBindingsAccessor, viewModel, bindingContext)
   {
      // Doing stuff here
      // ...

      return ko.bindingHandlers.if.init.apply(this, arguments);
   },
   update: function(element, valueAccessor, allBindingsAccessor, viewModel, bindingContext)
   {
       // Doing stuff here
       // ...

       ko.bindingHandlers.if.update.apply(this, arguments);
    }
};

I used to wrap both of if.init and if.update and it works fine on KO 3.0, I just noticed it was removed on KO 3.1.

It is possible to wrap if.update function on KO 3.1 ? or do you have other suggestions that could help to achieve this?

Greatly appreciate it, Thanks.

Answer 1

You can add a property to your wrapper function that tells you if the IF-binding was fired before and/or if it has rendered its childs already. Then you can do exactly the same operations as you would have done with the former update callback.