directive - angularjs: only set background-image on ngStyle if url is defined -

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i have property on scope can hold url (bgurl) of image. use image background image of 'div'. however, if property undefined use default image defined class bg-image. can like

<img ng-show="bgurl" ng-src="bgurl"/> <div ng-hide="bgurl" class="bg-image"/>

however, combine 1 element. tried this

<div class="gb-image" ng-style="{true: 'background-image': 'url(\'' + bgurl + '\')'}[bgurl]"/>

i copied code google (no idea if can ever work). 1 thing clear though, doesn't work :) nice angular way solve , can solution work ?

right way directive way:

app.directive('bg', function () {     return {         link: function(scope, element, attrs) {           if(scope.bgurl){             element.css("background-image","url("+scope.bgurl+")");           } else {             element.addclass("bg-default");                        }         }     } });

take look: http://plnkr.co/edit/xyejpp?p=preview


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