我正在尝试使用Angular 2创建表单,但我遇到以下错误:
core.umd.js:3370 EXCEPTION:无法读取undefinedErrorHandler.handleError @ core.umd.js的属性'ProductName':3370next @ core.umd.js:6838schedulerFn @ core.umd.js:6088SafeSubscriber .__ tryOrUnsub @ Subscriber .ts:238SafeSubscriber.next @ Subscriber.ts:190Subscriber._next @ Subscriber.ts:135Subscriber.next @ Subscriber.ts:95Subject.next @ Subject.ts:61EventEmitter.emit @core.umd.js:6080onError @ core.umd .js:6303onHandleError @ core.umd.js:6179ZoneDelegate.handleError @ zone.js:207Zone.runTask @ zone.js:139drainMicroTaskQueue @ zone.js:368ZoneTask.invoke @ zone.js:308 core.umd.js:3375 ORIGINAL STACKTRACE:ErrorHandler.handleError @ core.umd.js:3375next @ core.umd.js:6838schedulerFn @core.umd.js:6088SafeSubscriber .__ tryOrUnsub @ Subscriber.ts:238SafeSubscriber.next @ Subscriber。 ts:190Subscriber._next @ Subscriber.ts:135Subscriber.next @ Subscriber.ts:95Subject.next @ Subject.ts:61EventEmitter.emit @ core.umd.js:6080onError @ core.umd.js:6303onHandleError @ core.umd。 js:6179ZoneDelegate.handleError @ zone.js:207Zone.runTask @ zone.js:139drainMicroTaskQueue @ zone.js:368ZoneTask.invoke @ zone.js:308 core.umd.js:3376 TypeError:无法读取未定义的属性“ProductName” 在AppView._View_ProductAddComponent0.detectChangesInternal(ProductAddComponent.ngfactory.js:542) 在AppView.detectChanges(core.umd.js:9470) 在AppView.detectViewChildrenChanges(core.umd.js:9496) 在AppView.detectChangesInternal(core.umd.js:9481) 在AppView.detectChanges(core.umd.js:9470) 在AppView.detectContentChildrenChanges(core.umd.js:9488) 在AppView._View_AppComponent0.detectChangesInternal(AppComponent.ngfactory.js:469) 在AppView.detectChanges(core.umd.js:9470) 在AppView.detectViewChildrenChanges(core.umd.js:9496) 在AppView._View_AppComponent_Host0.detectChangesInternal(AppComponent_Host.ngfactory.js:86)ErrorHandler.handleError @ core.umd.js:3376next @ core.umd.js:6838schedulerFn @core.umd.js:6088SafeSubscriber .__ tryOrUnsub @ Subscriber.ts:238SafeSubscriber .next @ Subscriber.ts:190Subscriber._next @ Subscriber.ts:135Subscriber.next @ Subscriber.ts:95Subject.next @ Subject.ts:61EventEmitter.emit @core.umd.js:6080onError @ core.umd.js:6303onHandleError @ core.umd.js:6179ZoneDelegate.handleError @ zone.js:207Zone.runTask @ zone.js:139drainMicroTaskQueue @ zone.js:368ZoneTask.invoke @ zone.js:308 zone.js:357 TypeError:无法读取未定义(...)
的属性“ProductName”
我尝试按照Angular 2入门教程,根据需要更改变量和对象。但错误仍在继续。 我究竟做错了什么? 这是我的代码。
我的模特:
export class Product {
constructor(
public ProductName: string,
public ProductDescription: string) { }
}
我的组件:
import { Component, OnInit, AfterViewInit } from '@angular/core';
import { RouterModule, Routes } from '@angular/router';
import { Product } from '../models/product.model'
@Component({
templateUrl: 'templates/Product_Add.html'
})
export class ProductAddComponent {
public title: string = "Add Product"
public product: Product;
product_register(){
}
}
我的模板:
<div class="panel panel-default">
<div class="panel-heading">
<h3 class="panel-title">{{ title }}</h3>
</div>
<form #form="ngForm" (ngSubmit)="product_register(form.value)">
<div class="panel-body">
<div class="row">
<div class="form-group col-md-6">
<label>Name</label>
<input type="text" class="form-control" tabindex="1" maxlength="40" [(ngModel)]="product.ProductName"/>
</div>
<div class="form-group col-md-12">
<label>Description</label>
<input type="text" class="form-control" tabindex="2" maxlength="200" [(ngModel)]="product.ProductDescription"/>
</div>
</div>
</div>
<div class="panel-footer">
<a class="btn btn-primary" type="submit">Save</a>
<a class="btn btn-default" type="reset">Reset</a>
</div>
</form>
</div>
我尝试将我的模型更改为:
export interface Product {
ProductName: string;
ProductDescription;
}
和:
export class Product {
public ProductName: string;
public ProductDescription: string;
}
但出现同样的错误, 感谢
答案 0 :(得分:2)
试试这个
import { Component, OnInit, AfterViewInit } from '@angular/core';
import { RouterModule, Routes } from '@angular/router';
import { Product } from '../models/product.model'
@Component({
templateUrl: 'templates/Product_Add.html'
})
export class ProductAddComponent {
public title: string = "Add Product"
private product:Product = new Product();
//public product: Product;
product_register(){
}
}
将课程更改为
export class Product {
public ProductName: string;
public ProductDescription: string;
constructor(){}
}