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我写角2应用程序和里面我已经写上引导角2的addEventListener内部指令
<li class="dropdown" dropdown>
<a class="dropdown-toggle" data-toggle="dropdown">
User <span class="caret"></span>
</a>
<ul class="dropdown-menu" aria-labelledby="download">
<li><a routerLink="/user/profile">My Profile</a></li>
<li><a (click)="logout()">Log Out</a></li>
</ul>
</li>
所有我要的是写下一个小的指令,用于切换菜单下拉菜单。到此为止:
@Directive({
selector: "[dropdown]"
})
export class DropdownDirective implements OnInit {
private isOpen = false;
private defaultClassName: string;
@HostListener('click') toggle() {
let that = this;
if (!this.isOpen) {
this.elRef.nativeElement.className = this.defaultClassName + " open";
document.addEventListener("click",() => {
that.elRef.nativeElement.className = that.defaultClassName;
that.isOpen = false;
document.removeEventListener("click");
});
this.isOpen = !this.isOpen;
}
}
constructor(private elRef: ElementRef) {
}
ngOnInit(): void {
this.defaultClassName = this.elRef.nativeElement.className;
}
}
看起来不错。但不起作用。经过简短的调试后,我发现事件侦听器被添加到文档中,在它被分配之后触发。
document.addEventListener("click",() => {
that.elRef.nativeElement.className = that.defaultClassName;
that.isOpen = false;
document.removeEventListener("click");
});
作为一个事实菜单,它刚刚打开后关闭。如何解决它,为什么会发生这种情况?
谢谢。这解决了我的问题! – dantey89