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[英]How to change variable of one component from another component in Angular 5
[英]Angular 2- change class from one component to another
我有2個組件-A,B並希望從A更改B的類。例如將ng-valid更改為ng-invalid
<A #a></A > <B> </B>
從BI希望將類賦予A,或將A的ng-valid類更改為ng-invalid。
看到這個笨拙的人以了解如何做到這一點: https ://plnkr.co/edit/wz771Lnnn3GjHWFmykGl?p=preview
正如您所評論的,您可以使用@Input
來訪問該組件。
import {Component, NgModule, Input, ElementRef} from '@angular/core'
import {BrowserModule} from '@angular/platform-browser'
@Component({
selector: 'AComp',
template: 'a-component',
styles: [
':host(.ng-valid) { color: green; font-weight: bold; }',
':host(.ng-invalid) { color: red; font-weight: bold; }'
]
})
export class AComp {
constructor(private _eRef: ElementRef) {}
public addClass(c: string) {
console.dir(this._eRef);
this._eRef.nativeElement.classList.add(c);
}
public removeClass(c: string) {
this._eRef.nativeElement.classList.remove(c);
}
}
@Component({
selector: 'BComp',
template: 'b-component'
})
export class BComp {
@Input('a-comp') private _aComp: AComp;
constructor() { }
ngOnInit() {
this._aComp.addClass('ng-valid')
setTimeout(() => this._aComp.addClass('ng-invalid'), 1000);
setTimeout(() => this._aComp.removeClass('ng-invalid'), 3000);
}
}
@Component({
selector: 'my-app',
template: `
<div>
<h2>Hello {{name}}</h2>
<AComp #acmp></AComp>
<br />
<BComp [a-comp]="acmp"></BComp>
</div>
`,
})
export class App {
constructor() {
this.name = 'Angular2'
}
}
@NgModule({
imports: [ BrowserModule ],
declarations: [ App, AComp, BComp ],
bootstrap: [ App ]
})
export class AppModule {}
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