Super-simple touch event bindings for Knockout.js

bindings.js

// Uses Hammer-jquery | https://github.com/EightMedia/hammer.js/blob/master/dist/jquery.hammer.js

$.extend(ko.bindingHandlers, {
  touchEvent: {
    defaults: {},
    init: function(el, valueAccessor, allBindingsAccessor) {
      var self = ko.bindingHandlers.touchEvent,
          events = ko.utils.unwrapObservable(valueAccessor()),
          allOptions = allBindingsAccessor(),
          opts = allOptions.touchEventOptions ? allOptions.touchEventOptions : {};
          
      $.map(events, function(callback, event) {
        var o = $.extend(self.defaults, opts);
        
        $(el).hammer(o).on(event, callback);
        
        ko.utils.domNodeDisposal.addDisposeCallback(el, function() {
          $(el).off(event);
        });
      });
    }
  }
});

Probably should write some update logic to handle unbinding callbacks.