如何在angular 8中将用key初始化的json操作为ngFor

Question

我有一个用key初始化的json(key可以是change，它是动态的(，我需要按照静态html手动填充到ngFor中。我已经试过了，但没有工作，所以我评论道。"mainitem"的值将作为标题出现，"Secondeem"的键将出现在li标记中。这是下面的代码和演示https://stackblitz.com/edit/angular-ufbwzw?file=src%2Fapp%2Fapp.component.ts

app.component.html

<p>
Start editing to see some magic happen :)
</p>
<!--<div>
<ul>
<ng-container *ngFor="let item of jsonarray">
<h5>{{item.mainitem}}</h5>
<li *ngFor="let subItem of item.Seconditem | keyvalue">
{{subItem.key}} - {{subItem.value}}
</li>
</ng-container>
</ul>
</div>
-->
<div>
<ul>
<h5>My item 1</h5>
<li>createddate</li>
<li>enddate</li>
<h5>My item 2</h5>
<li>origindate</li>
<li>startdate</li>
</ul>
</div>

app.component.ts

import { Component, OnInit } from "@angular/core";
@Component({
selector: "my-app",
templateUrl: "./app.component.html",
styleUrls: ["./app.component.css"]
})
export class AppComponent {
name = "Angular";
jsonarray = {
"575": [
{
mainitem: "My item 1",
Seconditem: {
createddate: "30-01-02",
enddate: "30-01-03"
}
},
{
mainitem: "My item 2",
Seconditem: {
origindate: "30-01-04",
startdate: "30-01-05"
}
}
]
};
ngOnInit() {}
}

Answer 1

<ul>
<ng-container *ngFor="let item of jsonarray | keyvalue">
<ng-container *ngFor="let value of item.value">
<h5>{{value.mainitem}}</h5>
<li *ngFor="let subItem of value.Seconditem | keyvalue">
{{subItem.key}} - {{subItem.value}}
</li>
</ng-container>
</ng-container>
</ul>

工作堆栈闪电战：-https://stackblitz.com/edit/angular-kfwv4m?file=src/app/app.component.html