[英]How can I pass value from one component from another component in Angular8 (Independent components)
[英]How to pass an object from a service to a component in Angular8?
我有一个问题,我想将 object 列表从服务传递给组件。 响应未定义。
这是data-service.service :
import { Injectable } from '@angular/core';
@Injectable({
providedIn: 'root',
})
export class DataService {
public data: {
"first": [
{
list: 'first';
id: 1;
title: 'First list title item';
description?: 'Example description for first list title item';
completed: false;
}
],
"second": [
{
list: 'second'
id: 2;
title: 'Second list title item';
description?: 'Example description for second list title item';
completed: false;
}
],
"third": [
{
list: 'third'
id: 2;
title: 'Third list title item';
description?: 'Example description for third list title item';
completed: false;
}
],
};
loadAll(){
return this.data;
}
}
of component view-item.component.ts这是组件view-item.component.ts的
import { Component, OnInit } from '@angular/core';
import { DataService } from '../service/data-service.service';
@Component({
selector: 'app-todo-item',
templateUrl: './view-item.component.html',
styleUrls: ['./view-item.component.scss'],
})
export class ViewItemComponent implements OnInit {
todos: {};
constructor(private dataService: DataService) {}
ngOnInit() {
this.todos = this.dataService;
this.dataService.loadAll();
console.log(this.dataService.data);
}
}
现在我只需要 object 的 console.log。
谢谢!
您的代码中有一堆语法错误。
1)您没有为服务中的data
分配任何内容。
2) 键/属性应该用逗号分隔,而不是分号。
这应该解决它。
在您的 data-service.service.ts 上,
@Injectable()
export class DataService {
public data = {
"first": [
{
list: 'first',
id: 1,
title: 'First list title item',
description: 'Example description for first list title item',
completed: false,
}
],
"second": [
{
list: 'second',
id: 2,
title: 'Second list title item',
description: 'Example description for second list title item',
completed: false,
}
],
"third": [
{
list: 'third',
id: 2,
title: 'Third list title item',
description: 'Example description for third list title item',
completed: false,
}
],
};
loadAll(){
return this.data;
}
}
在您的 component.ts 上,您应该将服务中的loadAll()
方法返回的值分配给组件中的变量或属性。
import { Component, OnInit } from '@angular/core';
import { DataService } from '../service/data-service.service';
@Component({
selector: 'app-todo-item',
templateUrl: './view-item.component.html',
styleUrls: ['./view-item.component.scss'],
})
export class ViewItemComponent implements OnInit {
todos;
constructor(private dataService: DataService) {}
ngOnInit() {
this.todos = this.dataService.loadAll();
console.log(this.todos);
}
}
我在这里复制了一个演示。
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