README.md

<div loading-cover="coversIfThisIsTrue">
   CONTENT
</div>

loading-cover.less

.loading-cover {
  position: relative;
  .loading:before, .loading:after {
    content: " ";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    min-height: 50px;
    min-width: 50px;
    z-index: 1000;
  }
  .loading:before {
    background-color: white;
    opacity: 0.5;
  }
}

loadingCover.coffee

angular.module('emma').directive 'loadingCover', ->
  restrict: 'A'
  scope: no
  link: (scope, element, attrs) ->
    loadingLayer = angular.element('<div class="loading"></div>')
    element.append(loadingLayer)
    element.addClass('loading-cover')
    scope.$watch attrs.loadingCover, (value) ->
      loadingLayer.toggleClass('ng-hide', !value)