[英]Angular 2 RC 5 - Can't bind to '…' since it isn't a known property of '…'
[英]Angular2 RC5 tutorial : Can't bind to 'ngModel' since it isn't a known property of 'input'
繼Angular 2 “Hero tour”教程之后 ,我遇到以下錯誤:
Unhandled Promise rejection: Template parse errors:
Can't bind to 'ngModel' since it isn't a known property of 'input'. ("
<div>
<label>name: </label>
<input [ERROR ->][(ngModel)]="hero.name" placeholder="name">
</div>
"): AppComponent@6:13 ; Zone: <root> ; Task: Promise.then ; Value:
我的package.json內容是:
{
"name": "angular2-quickstart",
"version": "1.0.0",
"scripts": {
"start": "tsc && concurrently \"npm run tsc:w\" \"npm run lite\" ",
"lite": "lite-server",
"postinstall": "typings install",
"tsc": "tsc",
"tsc:w": "tsc -w",
"typings": "typings"
},
"license": "ISC",
"dependencies": {
"@angular/common": "2.0.0-rc.5",
"@angular/compiler": "2.0.0-rc.5",
"@angular/core": "2.0.0-rc.5",
"@angular/forms": "0.3.0",
"@angular/http": "2.0.0-rc.5",
"@angular/platform-browser": "2.0.0-rc.5",
"@angular/platform-browser-dynamic": "2.0.0-rc.5",
"@angular/router": "3.0.0-rc.1",
"@angular/router-deprecated": "2.0.0-rc.2",
"@angular/upgrade": "2.0.0-rc.5",
"systemjs": "0.19.27",
"core-js": "^2.4.0",
"reflect-metadata": "^0.1.3",
"rxjs": "5.0.0-beta.6",
"zone.js": "^0.6.12",
"angular2": "^2.0.0-beta.17",
"angular2-in-memory-web-api": "0.0.15",
"bootstrap": "^3.3.6"
},
"devDependencies": {
"concurrently": "^2.0.0",
"lite-server": "^2.2.0",
"typescript": "^1.8.10",
"typings":"^1.0.4"
}
}
app.module.ts內容:
import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { FormsModule } from '@angular/forms';
import { AppComponent } from './app.component';
@NgModule({
imports: [ BrowserModule, FormsModule ],
declarations: [ AppComponent ],
bootstrap: [ AppComponent ]
})
export class AppModule { }
和app.component內容:
import { Component } from '@angular/core';
export class Hero {
id: number;
name: string;
}
@Component({
selector: 'my-app',
template: `
<h1>{{title}}</h1>
<h2>{{hero.name}} details!</h2>
<div><label>id: </label>{{hero.id}}</div>
<div>
<label>name: </label>
<input [(ngModel)]="hero.name" placeholder="name">
</div>
`
})
export class AppComponent {
title = 'Tour of Heroes';
hero: Hero = {
id: 1,
name: 'Windstorm'
};
}
我花時間在stackoverflow上閱讀並應用類似問題中提出的解決方案但沒有成功。
可能有什么不對?
方案:
使用
//main entry point
import {platformBrowserDynamic} from '@angular/platform-browser-dynamic';
import {AppModule} from './app';
platformBrowserDynamic().bootstrapModule(AppModule)
代替 :
import { bootstrap } from '@angular/platform-browser-dynamic';
import { AppComponent } from './app.component';
bootstrap(AppComponent);
你的app.module.ts應如下所示:
import { NgModule } from '@angular/core'; import { BrowserModule } from '@angular/platform-browser'; import { FormsModule, provideForms, disableDeprecatedForms } from '@angular/forms'; import { AppComponent } from './app.component'; @NgModule({ imports: [ BrowserModule, FormsModule ], declarations: [ AppComponent ], bootstrap: [ AppComponent ], providers: [ disableDeprecatedForms(), provideForms()], }) export class AppModule { }
更新:RC6及更高版本現在已經過時了
在RC6中它看起來像這樣:
...
import { FormsModule } from '@angular/forms';
@NgModule({
imports: [ ..., FormsModule ],
declarations: [ AppComponent ],
bootstrap: [ AppComponent ]
})
export class AppModule { }
即提供provideForms
, disableDeprecatedForms
被刪除為已棄用。 有關詳細信息,請查看https://github.com/angular/angular/blob/master/CHANGELOG.md 。
謝謝你,除非那部分......什么都沒發生! import { FormsModule, provideForms, disableDeprecatedForms } from '@angular/forms';
如果您不根據需要更新app.modules.ts文件,則會發生類似的錯誤。 那就是添加以下導入
import { FormsModule } from '@angular/forms';和FormsModule如下:
導入:[BrowserModule,FormsModule],
該應用程序工作正常。 但我在測試中遇到了這個錯誤。 你應該在app.monent.ts中的app.component.spec.ts中導入FormsModule來解決這個問題。
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