angularjs – 当ng-show被触发时调用函数？

我想显示一个灯箱，内容由ng-show显示，但我不知道如何触发灯箱JS。我在找东西

ng-on-show="showLightBox()"

我想，最好是 $watch你的模型，ng-show绑定。

这里是例子：

<div ng-app="myApp" ng-controller="myCtrl" ng-init="isdisplayed = true">
    <div ng-show="isdisplayed">something</div>
    <button ng-click="isdisplayed = !isdisplayed">Toggle</button>
</div>

var myApp = angular.module('myApp',[])
.controller('myCtrl',function($scope,$log) {
    $scope.$watch('isdisplayed',function(newValue,oldValue) {
        if (newValue !== oldValue) {
            $log.log('Changed!');
        }
    });
});

和fiddle