[英]Angular 7 Communication through service subscribe method called twice
I'm using angular, trying to communicate to a component that is not parent-child.我正在使用 angular,试图与非父子组件通信。 So I'm communicating it through service
所以我通过服务来传达它
service.ts服务.ts
Istoggle=false;
@Output() change: EventEmitter < boolean > = new EventEmitter();
toggle() {
this.Istoggle= !this.Istoggle;
this.toggle.emit(this.Istoggle);
}
search.ts search.ts
submit():void{
this.service.toggle();
}
Home.ts主页.ts
ngOnInit() {
this.service.change.subscribe(_toggle=> {
//some code here
}
}
so when I click on submit in Home component toggle subscribe get hit twice所以当我在 Home 组件中点击提交时切换订阅被点击两次
as I see you have 3 fields with exact the same name in your service.如我所见,您的服务中有 3 个名称完全相同的字段。 2 of them are missed.
其中2个被遗漏了。 you could do
你可以
value=false;
search: EventEmitter < boolean > = new EventEmitter();
toggle() {
this.value = !this.value;
this.search.emit(this.value);
}
in your service and in component:在您的服务和组件中:
ngOnInit() {
this.service.search.subscribe(value => {
//some code here
}
}
note that I removed @Output() decorator.请注意,我删除了 @Output() 装饰器。 it is used only inside components just for parent-child communication.
它仅在组件内部用于父子通信。
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