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AngularUI路由器用户:

<a ui-sref-active="active" ui-sref="app">

这将在选中的对象上放置一个活动类。

其他回答

Here is the solution that I came up with after reading some of the excellent suggestions above. In my particular situation, I was trying to use Bootstrap tabs component as my menu, but didn't want to use the Angular-UI version of this because I want the tabs to act as a menu, where each tab is bookmark-able, rather than the tabs acting as navigation for a single page. (See http://angular-ui.github.io/bootstrap/#/tabs if you're interested in what the Angular-UI version of bootstrap tabs looks like).

I really liked kfis's answer about creating your own directive to handle this, however it seemed cumbersome to have a directive that needed to be placed on every single link. So I've created my own Angular directive which is placed instead once on the ul. Just in case any one else is trying to do the same thing, I thought I'd post it here, though as I said, many of the above solutions work as well. This is a slightly more complex solution as far as the javascript goes, but it creates a reusable component with minimal markup.

下面是指令的javascript和ng:view的路由提供程序:

var app = angular.module('plunker', ['ui.bootstrap']).
  config(['$routeProvider', function($routeProvider) {
    $routeProvider.
        when('/One', {templateUrl: 'one.html'}).
        when('/Two', {templateUrl: 'two.html'}).
        when('/Three', {templateUrl: 'three.html'}).
        otherwise({redirectTo: '/One'});
  }]).
  directive('navTabs', ['$location', function(location) {
    return {
        restrict: 'A',
        link: function(scope, element) {
            var $ul = $(element);
            $ul.addClass("nav nav-tabs");

            var $tabs = $ul.children();
            var tabMap = {};
            $tabs.each(function() {
              var $li = $(this);
              //Substring 1 to remove the # at the beginning (because location.path() below does not return the #)
              tabMap[$li.find('a').attr('href').substring(1)] = $li;
            });

            scope.location = location;
            scope.$watch('location.path()', function(newPath) {
                $tabs.removeClass("active");
                tabMap[newPath].addClass("active");
            });
        }

    };

 }]);

然后在你的html中你只需:

<ul nav-tabs>
  <li><a href="#/One">One</a></li>
  <li><a href="#/Two">Two</a></li>
  <li><a href="#/Three">Three</a></li>
</ul>
<ng:view><!-- Content will appear here --></ng:view>

这里是它的活塞:http://plnkr.co/edit/xwGtGqrT7kWoCKnGDHYN?p=preview。

我有类似的问题,菜单位于控制器范围之外。不确定这是最好的解决方案还是推荐的解决方案,但这对我来说是有效的。我已经在我的应用程序配置中添加了以下内容:

var app = angular.module('myApp');

app.run(function($rootScope, $location){
  $rootScope.menuActive = function(url, exactMatch){
    if (exactMatch){
      return $location.path() == url;
    }
    else {
      return $location.path().indexOf(url) == 0;
    }
  }
});

那么在视图中,我有:

<li><a href="/" ng-class="{true: 'active'}[menuActive('/', true)]">Home</a></li>
<li><a href="/register" ng-class="{true: 'active'}[menuActive('/register')]">
<li>...</li>

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()
}

这里有一个简单的方法,可以很好地使用Angular。

<ul>
    <li ng-class="{ active: isActive('/View1') }"><a href="#/View1">View 1</a></li>
    <li ng-class="{ active: isActive('/View2') }"><a href="#/View2">View 2</a></li>
    <li ng-class="{ active: isActive('/View3') }"><a href="#/View3">View 3</a></li>
</ul>

在你的AngularJS控制器中:

$scope.isActive = function (viewLocation) {
     var active = (viewLocation === $location.path());
     return active;
};

这个帖子有许多其他类似的答案。

如何用Angular JS设置引导导航栏活动类?

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();
    });
  });
});