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angular - 未定义标识符 'title'。 '{}' 不包含这样的成员 angular 8

转载 作者:行者123 更新时间:2023-12-03 22:00:16 28 4
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这是我的组件文件:

import { Router, ActivatedRoute } from '@angular/router';
import { Component, OnInit } from '@angular/core';
import { CategoriesService } from 'src/app/categories.service';
import { ProductService } from 'src/app/product.service';
import 'rxjs/add/operator/take';

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

categories$;
product: {};

constructor(categoryservice: CategoriesService , private productservice: ProductService , private router: Router,
private route: ActivatedRoute) {
this.categories$ = categoryservice.getcategories();

let id = this.route.snapshot.paramMap.get('id');
if (id) { this.productservice.get(id).take(1).subscribe(p => this.product = p); }
}

save(product) {
this.productservice.create(product);
this.router.navigate(['/admin/products']);
}

ngOnInit() {
}

}

这是我的 html 文件
 <!DOCTYPE html>
<html lang="en">

<head>
<meta charset="UTF-8">
<title >Title</title>
</head>

</html>

<div class="row">
<div class="col-md-6">

<form #f="ngForm" (ngSubmit)="save(f.value)">

<div class="form-group">
<label for="title">Title</label>
<input #title="ngModel" [(ngModel)]="product.title" name="title" id="title" type="text" class="form-control" required>
***<!-- ERROR : Identifier 'title' is not defined. '{}' does not contain such a member -->***
<div class="alert alert-danger" *ngIf="title.touched && title.invalid">
Title is required
</div>
</div>

<div class="form-group">
<label for="price">Price</label>
<div class="input-group-prepend">
<span class="input-group-text">$</span>
<input #price="ngModel" [(ngModel)]="product.price" name="price" id="price" type="number" class="form-control" required [min]="0">
<!--ERROR : Identifier 'price' is not defined. '{}' does not contain such a member -->
</div>
<div class="alert alert-danger" *ngIf="price.touched && price.invalid">
<div *ngIf="price.errors.required">Price is required</div>
<div *ngIf="price.errors.min">Price must be 0 or higher than zero</div>
</div>
</div>

<div class="form-group">
<label for="category">Cateogary</label>
<select #category="ngModel" [(ngModel)]="product.category" name="category" id="category" class="form-control" required>
<!--ERROR : Identifier 'category' is not defined. '{}' does not contain such a member -->
<option value=""></option>
<option *ngFor="let c of categories$ | async" [value]="c.$key">

{{ c.name }}

</option>
</select>
<div class="alert alert-danger" *ngIf="category.touched && category.invalid">
Category is required
</div>
</div>

<div class="form-group">
<label for="imageurl">Image Url</label>
<input #imageUrl="ngModel" [(ngModel)]="product.imageurl" name="imageUrl" id="imageurl" type="text" class="form-control" required url>
<!--ERROR : Identifier 'imageurl' is not defined. '{}' does not contain such a member -->
<div class="alert alert-danger" *ngIf="imageUrl.touched && imageUrl.invalid">
<div *ngIf="imageUrl.errors.required">ImageUrl is required</div>
<div *ngIf="imageUrl.errors.url">ImageUrl is required</div>

</div>
</div>

<button class="btn btn-primary">Save</button>

</form>
</div>

<div class="col-md-6">
<div class="card" style="width: 18rem;">
<img [src]="product.imageUrl" class="card-img-top" alt="..." *ngIf="product.imageUrl">
<div class="card-body">
<h5 class="card-title"> {{product.title}} </h5>
<!-- ERROR : Identifier 'title' is not defined. '{}' does not contain such a member -->
<p class="card-text"> {{product.price | currency:'USD':true}} </p>

</div>
</div>
</div>
</div>
  • 每当我部署我的项目时,我都会收到以下错误:
  • 未定义标识符“imageurl”。 “{}”不包含这样的成员
  • 未定义标识符“标题”。 “{}”不包含这样的成员
  • 未定义标识符“类别”。 “{}”不包含这样的成员
  • 未定义标识符“price”。“{}”不包含此类成员
  • 未定义标识符“标题”。 “{}”不包含这样的成员
  • 最佳答案

    尝试使用产品所需的字段( imageurl 等)定义一个类或接口(interface),然后将其导入您的组件并创建产品变量作为新类型,例如product: Product;而不是 product: {};
    例如。
    新文件 product.ts

    export class Product
    {
    imageUrl: string;
    title: string;
    //etc
    }

    现有的component.ts:
    import { Router, ActivatedRoute } from '@angular/router';
    import { Component, OnInit } from '@angular/core';
    import { CategoriesService } from 'src/app/categories.service';
    import { ProductService } from 'src/app/product.service';
    import { Product } from 'src/app/product';
    import 'rxjs/add/operator/take';

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

    categories$;
    product: Product;

    constructor(categoryservice: CategoriesService , private productservice: ProductService , private router: Router,
    private route: ActivatedRoute) {
    this.categories$ = categoryservice.getcategories();

    let id = this.route.snapshot.paramMap.get('id');
    if (id) { this.productservice.get(id).take(1).subscribe(p => this.product = p); }
    }

    save(product) {
    this.productservice.create(product);
    this.router.navigate(['/admin/products']);
    }

    ngOnInit() {
    }

    }

    在您进行 http 调用以检索产品数据的位置,还导入并指定产品类型,例如:
    get(): Observable<Product> {
    return this.http.get<Product>(exampleUrl);
    }

    关于angular - 未定义标识符 'title'。 '{}' 不包含这样的成员 angular 8,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/59949856/

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