Knockout Chosen Binding Handler with Cleanup (jQuery)

ko.bindinghandlers.chosen.js

ko.bindingHandlers.chosen = {
  listenBindings: ['value', 'disable', 'options', 'foreach'],
  init: function( element, valueAccessor, allBindings ) {
    var options = ko.unwrap(valueAccessor()), $_ = $(element);
    $_.chosen( $.extend( options, {
      width: '100%',
    } ) );

    ko.computed(function() {
      $.each(ko.bindingHandlers.chosen.listenBindings, function( i, binding ) {
        var b = allBindings.get(binding);
        b = $.isFunction(b) ? b() : b;
        ko.unwrap(b);

        $_.trigger('chosen:updated');
      } );

    }, null, { disposeWhenNodeIsRemoved: element });

    ko.utils.domNodeDisposal.addDisposeCallback(element, function(node) {
      $(node).chosen('destroy');
    });
  }
};