[英]Angular 2 doesn't bind when change a variable using setter method
我有以下AngularJS 2实例,我的问题是,当调用setter方法setCourse
,新数据“ java”无法反映到UI。 因此,应该显示“ java”而不是“ x,y,z”,但不会显示。
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'])
}
}
这是因为您要更改不同实例的变量。
您可以利用ViewChild来获取实例模板中定义的CourseComponent实例,只有在ngAfterViewInit钩子之后,您才能触发更改:
@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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