例外:不能绑定到'ngFor'，因为它不是一个已知的本机属性

我做错了什么?

import {bootstrap, Component} from 'angular2/angular2'

@Component({
  selector: 'conf-talks',
  template: `<div *ngFor="talk of talks">
     {{talk.title}} by {{talk.speaker}}
     <p>{{talk.description}}
   </div>`
})
class ConfTalks {
  talks = [ {title: 't1', speaker: 'Brian', description: 'talk 1'},
            {title: 't2', speaker: 'Julie', description: 'talk 2'}];
}
@Component({
  selector: 'my-app',
  directives: [ConfTalks],
  template: '<conf-talks></conf-talks>'
})
class App {}
bootstrap(App, [])

错误是

EXCEPTION: Template parse errors:
Can't bind to 'ngFor' since it isn't a known native property
("<div [ERROR ->]*ngFor="talk of talks">

当前回答

我忘记用“@Input”来注释我的组件(哎呀!)

html(违规代码):

<app-book-item
  *ngFor="let book of book$ | async"
  [book]="book">  <-- Can't bind to 'book' since it isn't a known property of 'app-book-item'
</app-book-item>

book-item.component.ts的修正版本:

import { Component, OnInit, Input } from '@angular/core';

import { Book } from '../model/book';
import { BookService } from '../services/book.service';

@Component({
  selector: 'app-book-item',
  templateUrl: './book-item.component.html',
  styleUrls: ['./book-item.component.css']
})
export class BookItemComponent implements OnInit {

  @Input()
  public book: Book;

  constructor(private bookService: BookService)  { }

  ngOnInit() {}

}

2019-01-18 00:39:54

其他回答

在angular 7中，通过在.module中添加这些行来解决这个问题。ts文件:

import {CommonModule} from @angular/common; 进口(CommonModule):

2019-06-25 02:44:51

有同样的问题，因为我使用了 *ngFor='for let card of cards' 而不是: *ngFor='let card of cards'

一开始就有一些for循环这里错了吗它工作了，但有错误

2021-09-02 05:14:13

我错过了就让在前面说话:

<div *ngFor="let talk of talks">

注意到。使用#…不建议在NgFor等结构性指令中声明局部变量。用let代替。

最初的回答:

我错过了#在谈话前:

<div *ngFor="#talk of talks">

我们很容易忘记#。我希望Angular的异常错误消息会说:you forget that # again。

2015-12-01 03:52:41

我忘记用“@Input”来注释我的组件(哎呀!)

html(违规代码):

<app-book-item
  *ngFor="let book of book$ | async"
  [book]="book">  <-- Can't bind to 'book' since it isn't a known property of 'app-book-item'
</app-book-item>

book-item.component.ts的修正版本:

import { Component, OnInit, Input } from '@angular/core';

import { Book } from '../model/book';
import { BookService } from '../services/book.service';

@Component({
  selector: 'app-book-item',
  templateUrl: './book-item.component.html',
  styleUrls: ['./book-item.component.css']
})
export class BookItemComponent implements OnInit {

  @Input()
  public book: Book;

  constructor(private bookService: BookService)  { }

  ngOnInit() {}

}

2019-01-18 00:39:54

在我的例子中，我犯了从文档中复制*ng-for=的错误。

https://angular.io/guide/user-input

如果我错了，请指正。但是*ng-for=似乎已经被更改为*ngFor=

2016-02-25 16:52:30

例外:不能绑定到'ngFor'，因为它不是一个已知的本机属性

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