javascript - Angularjs 指令的模板更新，但链接没有

Question

我有一个具有 2 种数据绑定(bind)范围的指令，如下所示:

app.directive('channelStar', function() {
  return {
    restrict: "E",
    template: 'This works fine : {{count}}',
    scope: {
      count: '='
    },
    link: function(scope, element, attrs) {
      // count is showing in template, but doesn't get updated here
      // actually it logs old scopes value
      console.log(scope.count);
    }
  }
});

在我的路由中的 Template 中(使用 ui-router 和嵌套状态):

<channel-star count="selectedChannel[0].channel_dir_members"></channel-star>

Controller :

httpService.request(...).then(function(result){
    $scope.selectedChannel = result.data;
    $rootScope.selectedChannel = result.data;
    // $scope.$applyAsync();
    // $rootScope.$applyAsync();
})

有什么想法吗？

Answer 1

link 函数只运行一次，如果要处理它的新值，可以使用scope.$watch watch count .

scope.$watch('count', function(newValue, oldValue) {
  if(newValue){
     //do something
  }
}, true);     // here parameter true is for deep compare objects, no need to use it when just for string