本文介绍了组件可见时发生的事件的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
当我的组件可见时,Angular2中是否有办法触发事件?它放在一个tabcontrol中,当用户切换我希望我的组件触发事件时,我想得到通知.
Is there a way in Angular2 to have an event fired when my component becomes visible ?It is placed in a tabcontrol and I want to be notified when the user switches I'd like my component to fire an event.
推荐答案
我最后做的(虽然不是很漂亮,但是在我没有更好的方法时可以工作...)是使用ngAfterContentChecked()
回调并自己处理更改.
What I finally did (which is not very beautiful but works while I don't have a better way to do it...) is to use the ngAfterContentChecked()
callback and handle the change myself.
@ViewChild('map') m;
private isVisible: boolean = false;
ngAfterContentChecked(): void
{
if (this.isVisible == false && this.m.nativeElement.offsetParent != null)
{
console.log('isVisible switched from false to true');
this.isVisible = true;
this.Refresh();
}
else if (this.isVisible == true && this.m.nativeElement.offsetParent == null)
{
console.log('isVisible switched from true to false');
this.isVisible = false;
}
}
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