从<span> </ span> <a> </a>中选择<span>

我正在测试一个指令，该指令将截断200个字符后的文本。它将转换为：

<span mw-text-collapse="long text long text long text
 long text long text long text long text long text long 
 text long text long text long text long text long text 
 long text long text long text long text long text long 
 text long text long text long text long text long text 
 long text long text long text long text long text long 
 text long text long text long text long text long text 
 long text long text long text long text long text long 
 text long text long text long text long text long text 
 long text long text long text long text long text long 
 text long text" class="ng-scope ng-isolate-scope"></span>

对此：

 <span class="line-break ng-binding">
    long text long text long text long text long 
    text long text long text long text long text 
    long text long text long text long text long 
    text long text long text long text long text 
    long text long text ...
 </span>
 <a ng-if="showButton" ng-click="toggleLength()" style="cursor: pointer" class="ng-binding ng-scope">
    {{ showLessOrMore() | i18n }}
 </a>

为了检查是否真的有200个字符，我只需要选择span元素。我怎样才能做到这一点？我尝试过el.find('span')但没有成功。

这是我的测试：

describe('mwTextCollapse', function () {

  var longText = 'long text long text long text long text long text ' +
    'long text long text long text long text long text long text long text ' +
    'long text long text long text long text long text long text long text ' +
    'long text long text long text long text long text long text long text ' +
    'long text long text long text long text long text long text long text ' +
    'long text long text long text long text long text long text long text ' +
    'long text long text long text long text long text long text long text ' +
    'long text long text long text long text long text long text long text';


  fit('text should have a default length of 200 chars', function () {
    var textCollapse = '<span mw-text-collapse="' + longText + '"></span>';
    var el = $compile(textCollapse)(scope);
    scope.$digest();

    console.log(el.html());   
  });
});

要测试的指令：

.directive('mwTextCollapse', function ($filter) {
  return {
    restrict: 'A',
    scope: {
      mwTextCollapse: '@',
      length: '=',
      markdown: '='
    },
    templateUrl: 'modules/ui/templates/mwComponents/mwTextCollapse.html',
    link: function (scope) {

      // set default length
      if( scope.length && typeof scope.length === 'number' ) {
        scope.defaultLength = scope.length;
      } else {
        scope.defaultLength = 200;
      }

      // set start length for filter
      scope.filterLength = scope.defaultLength;

      // apply filter length to text
      scope.text = function(){
        return $filter('reduceStringTo')(
          scope.mwTextCollapse, scope.filterLength
        );
      };

      // show Button if text is longer than desired
      scope.showButton = false;
      if( scope.mwTextCollapse.length > scope.defaultLength ) {
        scope.showButton = true;
      }

      // set button to "show more" or "show less"
      scope.showLessOrMore = function () {
        if( scope.filterLength === scope.defaultLength ){
          return 'common.showMore';
        } else {
          return 'common.showLess';
        }
      };

      // collapse/expand text by setting filter length
      scope.toggleLength = function () {
        if( scope.filterLength === scope.defaultLength ) {
          delete scope.filterLength;
        } else {
          scope.filterLength = scope.defaultLength;
        }
      };
    }
  };
})

我已经尝试过dfsq解决方案：

 fit('text should have a default length of 200 chars', function () {
    var textCollapse = '<span mw-text-collapse="' + longText + '"></span>';
    var el = $compile(textCollapse)(scope);
    scope.$digest();

    var span = angular.element(el[0]);
    console.log(span.html());


  });

仍然会产生<a></a>:(

INFO [PhantomJS 1.9.8 (Mac OS X 0.0.0)]: Connected on socket wIMQX3-7dA2T5nIr11PI with id 86239756
LOG: '<!-- ngIf: markdown -->

<!-- ngIf: !markdown --><div ng-if="!markdown" class="ng-scope">
  <span class="line-break ng-binding">long text long text long text long text long text long text long text long text long text long text long text long text long text long text long text long text long text long text long text long text ...</span>
  <!-- ngIf: showButton --><a ng-if="showButton" ng-click="toggleLength()" style="cursor: pointer" class="ng-binding ng-scope">{{ showLessOrMore() | i18n }}</a><!-- end ngIf: showButton -->
</div><!-- end ngIf: !markdown -->

'

编辑：知道了，正确的选择将是

var span = angular.element(el[0].children[0].children[0]);

更好

var span = el.find('span').text();