停止在jQuery单击事件中传播底层ng-click

Question

Twitter Bootstrap dropdown嵌套在一个tr.在tr通过可点击ng-click.单击页面上的任意位置将折叠下拉菜单.该行为在指令中定义$document.bind('click', closeMenu).

因此,当菜单打开,并且用户单击一行时,我希望菜单关闭(就像它一样)并且我想阻止该行上的click事件.

JSFiddle:http://jsfiddle.net/LMc2f/1/
JSFiddle +指令内联:http://jsfiddle.net/9DM8U/1/

来自ui-bootstrap-tpls-0.10.0.js的相关代码:

angular.module('ui.bootstrap.dropdownToggle', []).directive('dropdownToggle', ['$document', '$location', function ($document, $location) {
  var openElement = null,
      closeMenu   = angular.noop;
  return {
    restrict: 'CA',
    link: function(scope, element, attrs) {
      scope.$watch('$location.path', function() { closeMenu(); });
      element.parent().bind('click', function() { closeMenu(); });
      element.bind('click', function (event) {

        var elementWasOpen = (element === openElement);

        event.preventDefault();
        event.stopPropagation();

        if (!!openElement) {
          closeMenu();
        }

        if (!elementWasOpen && !element.hasClass('disabled') && !element.prop('disabled')) {
          element.parent().addClass('open');
          openElement = element;
          closeMenu = function (event) {
            if (event) {
              event.preventDefault();
              event.stopPropagation();
            }
            $document.unbind('click', closeMenu);
            element.parent().removeClass('open');
            closeMenu = angular.noop;
            openElement = null;
          };
          $document.bind('click', closeMenu);
        }
      });
    }
  };
}]);

我无法弄清楚如何阻止ng-click内部的基础事件closeMenu.

注意:我找不到访问方式,$event所以我无法尝试$event.stopPropagation().

Answer 1

我倾向于$event.stopPropagation()从模板本身内调用.与事件相关的逻辑很可能属于那里.应该使单元测试更容易.看模板的人也会知道事件在没有查看底层控制器的情况下没有冒泡.

<div ng-click="parentHandler()">
    <div ng-click="childHandler(); $event.stopPropagation()"></div>
</div>

Answer 2

dropdown指令绑定文档上的click事件,但是当您单击该行时,事件开始从目标元素向下传播到根文档节点(td- > tr- > table- > document).

这就是为什么ng-click即使指令在文档点击时"停止"气泡,你的行上的处理程序也会被调用.

解决方案是在添加文档的单击处理程序时使用useCapture标志.

启动捕获后,指定类型的所有事件将被分派到已注册的侦听器,然后再分派到DOM树中它下面的任何EventTarget.^MDN

现在,要指示dropdown指令使用您自己的处理程序,您需要更改指令的源.但这是第三方指令,出于维护原因,您可能不希望这样做.

这是强大的角度$装饰器开始的地方.您可以使用$ decorator动态更改第三方模块的源,而不实际触及实际的源文件.

因此,使用装饰器,并在文档节点上使用自定义事件处理程序,这就是您可以使该下拉列表的行为:

FIDDLE

var myApp = angular.module('myApp', []);

/**
 * Original dropdownToggle directive from ui-bootstrap.
 * Nothing changed here.
 */
myApp.directive('dropdownToggle', ['$document', '$location', function ($document, $location) {
  var openElement = null,
      closeMenu   = angular.noop;
  return {
    restrict: 'CA',
    link: function(scope, element, attrs) {
      scope.$watch('$location.path', function() { closeMenu(); });
      element.parent().bind('click', function() { closeMenu(); });
      element.bind('click', function (event) {

        var elementWasOpen = (element === openElement);

        event.preventDefault();
        event.stopPropagation();

        if (!!openElement) {
          closeMenu();
        }

        if (!elementWasOpen && !element.hasClass('disabled') && !element.prop('disabled')) {
          element.parent().addClass('open');
          openElement = element;
          closeMenu = function (event) {
            if (event) {
              event.preventDefault();
              event.stopPropagation();
            }
            $document.unbind('click', closeMenu);
            element.parent().removeClass('open');
            closeMenu = angular.noop;
            openElement = null;
          };
          $document.bind('click', closeMenu); /* <--- CAUSE OF ALL PROBLEMS ----- */
        }
      });
    }
  };
}]);


/**
 * This is were we decorate the dropdownToggle directive
 * in order to change the way the document click handler works
 */
myApp.config(function($provide){
  'use strict';

  $provide.decorator('dropdownToggleDirective', [
      '$delegate',
      '$document',
      function ($delegate, $document) {

        var directive = $delegate[0];
        var openElement = null;
        var closeMenu = angular.noop;

        function handler(e){
            var elm = angular.element(e.target);
          if(!elm.parents('.dropdown-menu').length){
            e.stopPropagation();
            e.preventDefault();
          }
          closeMenu();
          // After closing the menu, we remove the all-seeing handler
          // to allow the application click events to work nnormally
          $document[0].removeEventListener('click', handler, true);
        }

        directive.compile = function(){
          return function(scope, element) {
            scope.$watch('$location.path', closeMenu);
            element.parent().bind('click', closeMenu);
            element.bind('click', function (event) {

              var elementWasOpen = (element === openElement);

              event.preventDefault();
              event.stopPropagation();

              if (!!openElement) {
                closeMenu();
              }

              if (!elementWasOpen && !element.hasClass('disabled') && !element.prop('disabled')) {
                element.parent().addClass('open');
                openElement = element;
                closeMenu = function (event) {
                  if (event) {
                    event.preventDefault();
                    event.stopPropagation();
                  }
                  $document.unbind('click', closeMenu);
                  element.parent().removeClass('open');
                  closeMenu = angular.noop;
                  openElement = null;
                };


                // We attach the click handler by specifying the third "useCapture" parameter as true
                $document[0].addEventListener('click', handler, true);
              }
            });
          };
        };

        return $delegate;
      }
  ]);

});

更新:

请注意,更新的自定义处理程序将阻止冒泡,除非目标元素是实际的下拉选项.这将解决即使单击下拉选项时阻止单击事件的问题.

这仍然不会阻止事件向下冒泡到行(从下拉选项),但这与下拉指令没有任何关系.无论如何,为了防止这种冒泡,你可以将$event对象传递给ng-click表达式函数,并使用该对象来阻止even向下冒泡到表行:

<div ng-controller="DropdownCtrl">
  <table>
    <tr ng-click="clicked('row')">
      <td>

        <div class="btn-group">
          <button type="button" class="btn btn-default dropdown-toggle">
            Action <span class="caret"></span>
          </button>
          <ul class="dropdown-menu" role="menu">
            <li ng-repeat="choice in items">
              <a ng-click="clicked('link element', $event)">{{choice}}</a>
            </li>
          </ul>
        </div>

      </td>
    </tr>
  </table>
</div>

function DropdownCtrl($scope) {
  $scope.items = [
    "Action",
    "Another action",
    "Something else here"
  ];

  $scope.clicked = function(what, event) {
    alert(what + ' clicked');
    if(event){
      event.stopPropagation();
      event.preventDefault();
    }
  }

}

Answer 3

你需要在小提琴的第2行传递ng-click的事件,然后在你的方法中对该对象进行preventDefault和stopPropigation

<tr ng-click="do($event)">