Angular指令链接功能仅在页面加载/重新加载时运行

I am trying to implement a toggle image [has 3 images src] based on if a user in a list has a filter set, the problem is the image src will not change when when I reloaded the candidates object via ajax because the link function in the directive is only being trigger on actual page reload.I am trying to implement a toggle image [has 3