在学习了Angular 2的"英雄导览"教程后,我遇到了以下错误:
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:
包。Json 内容为:
{
"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 内容:
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 content:
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'
};
}
我花时间阅读并应用了stackoverflow上类似问题的解决方案,但没有成功。
怎么了?
解决方案: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应该是这样的:
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 { }
在RC6中是这样的:
...
import { FormsModule } from '@angular/forms';
@NgModule({
imports: [ ..., FormsModule ],
declarations: [ AppComponent ],
bootstrap: [ AppComponent ]
})
export class AppModule { }
。移除已弃用的provideForms
、disableDeprecatedForms
。
谢谢你,除非那部分…什么都没发生!
import { FormsModule, provideForms, disableDeprecatedForms } from '@angular/forms';
如果你没有按要求更新app.modules.ts文件,也会出现类似的错误。这就是添加以下导入
从'@angular/forms';和FormsModule中导入{FormsModule},如下:
imports: [BrowserModule, FormsModule],
应用程序运行正常。但我在测试中犯了这个错误。你应该在app.component. specs .ts中像在app.module.ts中那样导入FormsModule来修复这个问题。