Angular2 - 不能访问＆QUOT;输入＆QUOT;从我的控制器/构造 [英] Angular2 - cannot access "Inputs" from my controller/constructor

问题描述

我有 @input ，这是我结合到模板一个简单的角2的组成部分。模板显示输入的数据，但我不能从构造函数访问它：

I have a simple Angular 2 component with @Input, which I bind to the template. The template shows input data, but I cannot access it from the constructor:

import {Component, View, bootstrap, Input} from 'angular2/angular2';
import DataService from './data-service';

@Component({
    selector: 'app-cmp'
})
@View({
    template: `{{data.firstName}} {{data.lastName}}` //-> shows the correct 'data'
})
export default class NamesComponent {
  @Input() data: any;
  constructor(dataService: DataService) {
    console.log(this.data);//undefined
  }
}

下面是一个 plunker 用一个例子（见的名字 - component.ts）。

Here is a plunker with an example (see "names-component.ts").

我在做什么错了？

推荐答案

由于该输入属性后才进行初始化视图设置。按照 DOC ，您可以在的OnInit 方法。

Because the Input property isn't initialized until view is set up. According to the doc, you can access your data in onInit method.

import {Component, View, bootstrap, Input} from 'angular2/angular2';
import DataService from './data-service';

@Component({
    selector: 'app-cmp'
})
@View({
    template: `{{data.firstName}} {{data.lastName}} {{name}}`
})
export default class NamesComponent {
  @Input() data;
  name: string;
  constructor(dataService: DataService) {
    this.name = dataService.concatNames("a", "b");
    console.log(this.data); // undefined here
  }
  ngOnInit() {
    console.log(this.data); // object here
  }
}

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