[英]Angular 2 doesn't bind when change a variable using setter method
我有以下AngularJS 2實例,我的問題是,當調用setter方法setCourse
,新數據“ java”無法反映到UI。 因此,應該顯示“ java”而不是“ x,y,z”,但不會顯示。
import {Component} from 'angular2/core'
@Component({selector:'course',
template: `
<ul> <li *ngFor="#x of courses"> {{ x }}</li> </ul>`
})
export class CourseComponent {
private courses: string[] = ['x ' , 'y ' , 'z'];
public setCourse(courses:string[]){
this.courses = courses;
}
}
import {Component} from 'angular2/core';
import {CourseComponent} from './course.component'
@Component({
selector: 'my-app',
template: '<h1>My First Angular 2 App</h1><course></course>',
directives:[CourseComponent],
providers:[CourseComponent]
})
export class AppComponent {
private newCourses:string[];
public constructor(courseComponent: CourseComponent){
courseComponent.setCourse(['java'])
}
}
這是因為您要更改不同實例的變量。
您可以利用ViewChild來獲取實例模板中定義的CourseComponent實例,只有在ngAfterViewInit鈎子之后,您才能觸發更改:
@Component({
selector: 'my-app',
template: '<h1>My First Angular 2 App</h1><course></course>'
})
export class AppComponent {
@ViewChild(CourseComponent) courseComponent;
ngAfterViewInit() {
this.courseComponent.setCourse(['java'])
}
}
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