Javascript Angular 4从另一个组件更改ngClass
我当前在app.component.ts中有此代码Javascript Angular 4从另一个组件更改ngClass,javascript,angular,Javascript,Angular,我当前在app.component.ts中有此代码 export class AppComponent { myclass: string; changeClass(myclass) { this.myclass = myclass; } } app.component.html <div [ngClass]="myclass"> ...rest of the content here </div> 现在,所有这些工作正常,但我现在想把
export class AppComponent {
myclass: string;
changeClass(myclass) {
this.myclass = myclass;
}
}
app.component.html
<div [ngClass]="myclass">
...rest of the content here
</div>
现在,所有这些工作正常,但我现在想把触发按钮放在另一个组件上
如果我把它放在另一个组件上:
<button (click)="changeClass('myFavClass')">Change Class to myFavClass</div>
将类更改为myFavClass
我怎样才能让它改变课程?有两种方法可以做到这一点 或者,您可以设置一个监控变量更改的服务,并将其用作更改的控制点 就我个人而言,我在这个实例中使用服务,因为它更容易管理代码及其流 这个答案包含了您需要查看的所有代码
希望这对你有所帮助有两种方法你可以使用 或者,您可以设置一个监控变量更改的服务,并将其用作更改的控制点 就我个人而言,我在这个实例中使用服务,因为它更容易管理代码及其流 这个答案包含了您需要查看的所有代码
希望这有帮助至少有两种选择<代码>主题和可观察的,或者如果此
另一个
组件是父组件,则可以使用@Input
受试者和可观察对象
方法:
强烈建议阅读整页
某些组件
export class SomeComponent {
constructor(private ClassService: ClassService) { }
private changeClass(class) {
this.ClassService.changeClass(class);
}
}
export class AnotherComponent implements OnInit, OnDestroy {
constructor(private ClassService: ClassService) { }
private class: string = "";
private subscribtion: Subscribtion;
ngOnInit(): void {
this.Subscribtion = this.ClassService.someClass$.subscribe(
(class) => { this.class = class; }
)
}
ngOnDestroy(): void {
this.Subscribtion.unsubscribe();
}
}
parent.component.html
<another-component [elementClass]="elClass"></another-component>
<button (click)="changeClass('myClass')">change class<button>
parent.component.ts
export class ParentComponnet {
private elClass: string = "";
changeClass(class: string) {
elClass = class;
}
}
another.component.html
<div [ngClass]="elementClass">
another.component.ts
export class AnotherComponent {
@Input() elementClass: string;
}
另一个组件
export class SomeComponent {
constructor(private ClassService: ClassService) { }
private changeClass(class) {
this.ClassService.changeClass(class);
}
}
export class AnotherComponent implements OnInit, OnDestroy {
constructor(private ClassService: ClassService) { }
private class: string = "";
private subscribtion: Subscribtion;
ngOnInit(): void {
this.Subscribtion = this.ClassService.someClass$.subscribe(
(class) => { this.class = class; }
)
}
ngOnDestroy(): void {
this.Subscribtion.unsubscribe();
}
}
parent.component.html
<another-component [elementClass]="elClass"></another-component>
<button (click)="changeClass('myClass')">change class<button>
parent.component.ts
export class ParentComponnet {
private elClass: string = "";
changeClass(class: string) {
elClass = class;
}
}
another.component.html
<div [ngClass]="elementClass">
another.component.ts
export class AnotherComponent {
@Input() elementClass: string;
}
服务
@Injectable();
export class ClassService{
constructor() { }
private someClassSource= new Subject<string>();
someClass$= this.someClassSource.asObservable();
changeClass(class) {
this.someClassSource.next(class);
}
}
另一个组件(必须是子组件)
other.component.html
另一个组件
导出类其他组件{
@Input()元素类:字符串;
}
还可以通过
@Output
(发射事件)进行子级到父级的交互。至少有两个选项<代码>主题和可观察的,或者如果此另一个
组件是父组件,则可以使用@Input
受试者和可观察对象
方法:
强烈建议阅读整页
某些组件
export class SomeComponent {
constructor(private ClassService: ClassService) { }
private changeClass(class) {
this.ClassService.changeClass(class);
}
}
export class AnotherComponent implements OnInit, OnDestroy {
constructor(private ClassService: ClassService) { }
private class: string = "";
private subscribtion: Subscribtion;
ngOnInit(): void {
this.Subscribtion = this.ClassService.someClass$.subscribe(
(class) => { this.class = class; }
)
}
ngOnDestroy(): void {
this.Subscribtion.unsubscribe();
}
}
parent.component.html
<another-component [elementClass]="elClass"></another-component>
<button (click)="changeClass('myClass')">change class<button>
parent.component.ts
export class ParentComponnet {
private elClass: string = "";
changeClass(class: string) {
elClass = class;
}
}
another.component.html
<div [ngClass]="elementClass">
another.component.ts
export class AnotherComponent {
@Input() elementClass: string;
}
另一个组件
export class SomeComponent {
constructor(private ClassService: ClassService) { }
private changeClass(class) {
this.ClassService.changeClass(class);
}
}
export class AnotherComponent implements OnInit, OnDestroy {
constructor(private ClassService: ClassService) { }
private class: string = "";
private subscribtion: Subscribtion;
ngOnInit(): void {
this.Subscribtion = this.ClassService.someClass$.subscribe(
(class) => { this.class = class; }
)
}
ngOnDestroy(): void {
this.Subscribtion.unsubscribe();
}
}
parent.component.html
<another-component [elementClass]="elClass"></another-component>
<button (click)="changeClass('myClass')">change class<button>
parent.component.ts
export class ParentComponnet {
private elClass: string = "";
changeClass(class: string) {
elClass = class;
}
}
another.component.html
<div [ngClass]="elementClass">
another.component.ts
export class AnotherComponent {
@Input() elementClass: string;
}
服务
@Injectable();
export class ClassService{
constructor() { }
private someClassSource= new Subject<string>();
someClass$= this.someClassSource.asObservable();
changeClass(class) {
this.someClassSource.next(class);
}
}
另一个组件(必须是子组件)
other.component.html
另一个组件
导出类其他组件{
@Input()元素类:字符串;
}
还可以通过@Output
(发出事件)什么“另一个组件”进行子级到父级的交互。请提供代码(TS+HTML),说明组件之间的关系。可能与“另一个组件”重复。请提供代码(TS+HTML)以演示组件之间的关系。可能存在重复的