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

根据@kfis的回答,这是评论,我的建议,最终指令如下:

.directive('activeLink', ['$location', function (location) {
    return {
      restrict: 'A',
      link: function(scope, element, attrs, controller) {
        var clazz = attrs.activeLink;        
        var path = attrs.href||attrs.ngHref;
        path = path.substring(1); //hack because path does not return including hashbang
        scope.location = location;
        scope.$watch('window.location.href', function () {
          var newPath = (window.location.pathname + window.location.search).substr(1);
          if (path === newPath) {
            element.addClass(clazz);
          } else {
            element.removeClass(clazz);
          }
        });
      }
    };
  }]);

下面是它在html中的用法: < div ng-app = "链接" > <a href="#/one" active-link="active"> one </a> <a href="#/two" active-link="active">One</a> <a href="#" active-link="active">home</a> < / div > 之后用css样式: .活跃{颜色:红色;}

其他回答

我是这样做的:

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

myApp.directive('trackActive', function($location) {
    function link(scope, element, attrs){
        scope.$watch(function() {
            return $location.path();
        }, function(){
            var links = element.find('a');
            links.removeClass('active');
            angular.forEach(links, function(value){
                var a = angular.element(value);
                if (a.attr('href') == '#' + $location.path() ){
                    a.addClass('active');
                }
            });
        });
    }
    return {link: link};
});

这可以让你在一个有跟踪活动指令的节中有链接:

<nav track-active>
     <a href="#/">Page 1</a>
     <a href="#/page2">Page 2</a>
     <a href="#/page3">Page 3</a>
</nav>

在我看来,这种方法比其他方法干净得多。

此外,如果你使用的是jQuery,你可以让它更整洁,因为jQlite只有基本的选择器支持。在angular include之前包含jquery的一个更简洁的版本是这样的:

myApp.directive('trackActive', function($location) {
    function link(scope, element, attrs){
        scope.$watch(function() {
            return $location.path();
        }, function(){
            element.find('a').removeClass('active').find('[href="#'+$location.path()+'"]').addClass('active');
        });
    }
    return {link: link};
});

这是一个jsFiddle

也有同样的问题。以下是我的解决方案:

.directive('whenActive',
  [
    '$location',
    ($location)->
      scope: true,
      link: (scope, element, attr)->
        scope.$on '$routeChangeSuccess', 
          () ->
            loc = "#"+$location.path()
            href = element.attr('href')
            state = href.indexOf(loc)
            substate = -1

            if href.length > 3
              substate = loc.indexOf(href)
            if loc.length is 2
              state = -1

            #console.log "Is Loc: "+loc+" in Href: "+href+" = "+state+" and Substate = "+substate

            if state isnt -1 or substate isnt -1
              element.addClass 'selected'
              element.parent().addClass 'current-menu-item'
            else if href is '#' and loc is '#/'
              element.addClass 'selected'
              element.parent().addClass 'current-menu-item'
            else
              element.removeClass 'selected'
              element.parent().removeClass 'current-menu-item'
  ])

使用指令(因为我们在这里做的是DOM操作),下面可能是最接近“angular方式”的方法:

$scope.timeFilters = [
  {'value':3600,'label':'1 hour'},
  {'value':10800,'label':'3 hours'},
  {'value':21600,'label':'6 hours'},
  {'value':43200,'label':'12 hours'},
  {'value':86400,'label':'24 hours'},
  {'value':604800,'label':'1 week'}
]

angular.module('whatever', []).directive('filter',function(){
return{
    restrict: 'A',
    template: '<li ng-repeat="time in timeFilters" class="filterItem"><a ng-click="changeTimeFilter(time)">{{time.label}}</a></li>',
    link: function linkFn(scope, lElement, attrs){

        var menuContext = attrs.filter;

        scope.changeTimeFilter = function(newTime){
          scope.selectedtimefilter = newTime;

        }

        lElement.bind('click', function(cevent){
            var currentSelection = angular.element(cevent.srcElement).parent();
            var previousSelection = scope[menuContext];

            if(previousSelection !== currentSelection){
                if(previousSelection){
                    angular.element(previousSelection).removeClass('active')
                }
                scope[menuContext] = currentSelection;

                scope.$apply(function(){
                    currentSelection.addClass('active');
                })
            }
        })
    }
}
})

然后你的HTML看起来像这样:

<ul class="dropdown-menu" filter="times"></ul>

我建议在链接上使用指令。

但它还不完美。小心哈希邦;)

下面是指令的javascript代码:

angular.module('link', []).
  directive('activeLink', ['$location', function (location) {
    return {
      restrict: 'A',
      link: function(scope, element, attrs, controller) {
        var clazz = attrs.activeLink;
        var path = attrs.href;
        path = path.substring(1); //hack because path does not return including hashbang
        scope.location = location;
        scope.$watch('location.path()', function (newPath) {
          if (path === newPath) {
            element.addClass(clazz);
          } else {
            element.removeClass(clazz);
          }
        });
      }
    };
  }]);

下面是它在html中的用法:

<div ng-app="link">
  <a href="#/one" active-link="active">One</a>
  <a href="#/two" active-link="active">One</a>
  <a href="#" active-link="active">home</a>
</div>

之后用css样式:

.active { color: red; }

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>