AngularJS在为当前页面的链接设置一个活动类方面有任何帮助吗?

我想一定有什么神奇的方法可以做到,但我似乎找不到。

我的菜单是这样的:

 <ul>
   <li><a class="active" href="/tasks">Tasks</a>
   <li><a href="/actions">Tasks</a>
 </ul>

我在我的路由中为它们每个都有控制器:TasksController和ActionsController。

但是我想不出一种方法将a链接上的“活动”类绑定到控制器。

有提示吗?


当前回答

对于那些使用ui-router的人,我的答案有点类似于Ender2050,但我更喜欢通过州名测试来做到这一点:

$scope.isActive = function (stateName) {
  var active = (stateName === $state.current.name);
  return active;
};

相应的HTML:

<ul class="nav nav-sidebar">
    <li ng-class="{ active: isActive('app.home') }"><a ui-sref="app.home">Dashboard</a></li>
    <li ng-class="{ active: isActive('app.tiles') }"><a ui-sref="app.tiles">Tiles</a></li>
</ul>

其他回答

在视图

<a ng-class="getClass('/tasks')" href="/tasks">Tasks</a>

在控制器

$scope.getClass = function (path) {
  return ($location.path().substr(0, path.length) === path) ? 'active' : '';
}

这样,tasks链接将在任何以'/tasks'开头的url中具有活动类。/任务/ 1 /报告)

有一个ng-class指令,它绑定变量和css类。 它还接受对象(className vs bool值对)。

这里有一个例子,http://plnkr.co/edit/SWZAqj

如果你想把指令的链接放在一个包装器中,而不是选择每个单独的链接(这样更容易查看Batarang中的作用域),这也很有效:

  angular.module("app").directive("navigation", [
    "$location", function($location) {
      return {
        restrict: 'A',
        scope: {},
        link: function(scope, element) {
          var classSelected, navLinks;

          scope.location = $location;

          classSelected = 'selected';

          navLinks = element.find('a');

          scope.$watch('location.path()', function(newPath) {
            var el;
            el = navLinks.filter('[href="' + newPath + '"]');

            navLinks.not(el).closest('li').removeClass(classSelected);
            return el.closest('li').addClass(classSelected);
          });
        }
      };
    }
  ]);

加价就是:

    <nav role="navigation" data-navigation>
        <ul>
            <li><a href="/messages">Messages</a></li>
            <li><a href="/help">Help</a></li>
            <li><a href="/details">Details</a></li>
        </ul>
    </nav>

我还应该提到,我在这个例子中使用的是“全脂”jQuery,但你可以很容易地改变我所做的过滤等。

这是我的意见,这很好。

注意:这与子页不匹配(这是我需要的)。

观点:

<a ng-class="{active: isCurrentLocation('/my-path')}"  href="/my-path" >
  Some link
</a>

控制器:

// make sure you inject $location as a dependency

$scope.isCurrentLocation = function(path){
    return path === $location.path()
}

我刚刚写了一个指令。

用法:

<ul class="nav navbar-nav">
  <li active><a href="#/link1">Link 1</a></li>
  <li active><a href="#/link2">Link 2</a></li>
</ul>

实现:

angular.module('appName')
  .directive('active', function ($location, $timeout) {
    return {
      restrict: 'A',
      link: function (scope, element, attrs) {
        // Whenever the user navigates to a different page...
        scope.$on('$routeChangeSuccess', function () {
          // Defer for other directives to load first; this is important
          // so that in case other directives are used that this directive
          // depends on, such as ng-href, the href is evaluated before
          // it's checked here.
          $timeout(function () {
            // Find link inside li element
            var $link = element.children('a').first();

            // Get current location
            var currentPath = $location.path();

            // Get location the link is pointing to
            var linkPath = $link.attr('href').split('#').pop();

            // If they are the same, it means the user is currently
            // on the same page the link would point to, so it should
            // be marked as such
            if (currentPath === linkPath) {
              $(element).addClass('active');
            } else {
              // If they're not the same, a li element that is currently
              // marked as active needs to be "un-marked"
              element.removeClass('active');
            }
          });
        });
      }
    };
  });

测试:

'use strict';

describe('Directive: active', function () {

  // load the directive's module
  beforeEach(module('appName'));

  var element,
      scope,
      location,
      compile,
      rootScope,
      timeout;

  beforeEach(inject(function ($rootScope, $location, $compile, $timeout) {
    scope = $rootScope.$new();
    location = $location;
    compile = $compile;
    rootScope = $rootScope;
    timeout = $timeout;
  }));

  describe('with an active link', function () {
    beforeEach(function () {
      // Trigger location change
      location.path('/foo');
    });

    describe('href', function () {
      beforeEach(function () {
        // Create and compile element with directive; note that the link
        // is the same as the current location after the location change.
        element = angular.element('<li active><a href="#/foo">Foo</a></li>');
        element = compile(element)(scope);

        // Broadcast location change; the directive waits for this signal
        rootScope.$broadcast('$routeChangeSuccess');

        // Flush timeout so we don't have to write asynchronous tests.
        // The directive defers any action using a timeout so that other
        // directives it might depend on, such as ng-href, are evaluated
        // beforehand.
        timeout.flush();
      });

      it('adds the class "active" to the li', function () {
        expect(element.hasClass('active')).toBeTruthy();
      });
    });

    describe('ng-href', function () {
      beforeEach(function () {
        // Create and compile element with directive; note that the link
        // is the same as the current location after the location change;
        // however this time with an ng-href instead of an href.
        element = angular.element('<li active><a ng-href="#/foo">Foo</a></li>');
        element = compile(element)(scope);

        // Broadcast location change; the directive waits for this signal
        rootScope.$broadcast('$routeChangeSuccess');

        // Flush timeout so we don't have to write asynchronous tests.
        // The directive defers any action using a timeout so that other
        // directives it might depend on, such as ng-href, are evaluated
        // beforehand.
        timeout.flush();
      });

      it('also works with ng-href', function () {
        expect(element.hasClass('active')).toBeTruthy();
      });
    });
  });

  describe('with an inactive link', function () {
    beforeEach(function () {
      // Trigger location change
      location.path('/bar');

      // Create and compile element with directive; note that the link
      // is the NOT same as the current location after the location change.
      element = angular.element('<li active><a href="#/foo">Foo</a></li>');
      element = compile(element)(scope);

      // Broadcast location change; the directive waits for this signal
      rootScope.$broadcast('$routeChangeSuccess');

      // Flush timeout so we don't have to write asynchronous tests.
      // The directive defers any action using a timeout so that other
      // directives it might depend on, such as ng-href, are evaluated
      // beforehand.
      timeout.flush();
    });

    it('does not add the class "active" to the li', function () {
      expect(element.hasClass('active')).not.toBeTruthy();
    });
  });

  describe('with a formerly active link', function () {
    beforeEach(function () {
      // Trigger location change
      location.path('/bar');

      // Create and compile element with directive; note that the link
      // is the same as the current location after the location change.
      // Also not that the li element already has the class "active".
      // This is to make sure that a link that is active right now will
      // not be active anymore when the user navigates somewhere else.
      element = angular.element('<li class="active" active><a href="#/foo">Foo</a></li>');
      element = compile(element)(scope);

      // Broadcast location change; the directive waits for this signal
      rootScope.$broadcast('$routeChangeSuccess');

      // Flush timeout so we don't have to write asynchronous tests.
      // The directive defers any action using a timeout so that other
      // directives it might depend on, such as ng-href, are evaluated
      // beforehand.
      timeout.flush();
    });

    it('removes the "active" class from the li', function () {
      expect(element.hasClass('active')).not.toBeTruthy();
    });
  });
});