Enable/Disable/OnUpdate Angular methods about html5sortable

[voidberg]

Ok, I will try to update the examples soon.

[jamesjieye]

I tried to add the following changes to the examples/angular-simple but it doesn't work. I can still drag and sort item D.

angular-single.js

'use strict';

var app = angular.module('Directives', ['htmlSortable']);

app.controller('MainCtrl', function($scope) {
  $scope.data1 = [
    { id: 1, name: 'A' },
    { id: 2, name: 'B' },
    { id: 3, name: 'C' },
    { id: 4, name: 'D', disabled: true }
  ];

  $scope.sortOptions = {
    items: ':not(.disabled)'
  };

  $scope.add = function () {
    $scope.data1.push({id: $scope.data1.length + 1, name: 'E'});
  };

  $scope.sortableCallback = function (sourceModel, destModel, start, end) {
    console.log(start + ' -> ' + end);
  };
});

angular-single.html

 <div>
        <ul html-sortable="sortOptions" html-sortable-callback="sortableCallback" ng-model='data1'>
          <li ng-repeat="itm in data1" ng-class="{disabled: itm.disabled}">
            {{itm}}
          </li>
        </ul>
      </div>

[lukasoppermann]

@northBorn could you send a PR using the current version?