[英]How to get last object from array of object based on condition in angular 8
我有一些对象,我使用settimeout
函数一个接一个地接收它们,然后每次都推送到数组中以填充到表中。 这是在我的项目中动态出现的,但仅供参考,我在这里使用settimeout
和硬编码。
现在我的问题是,每当我使用settimeout
接收数据时,我需要通过使用 Vehicle_number 过滤来获取最后一个对象(如果它包含相同的 Vehicle_number,我需要获取该 Vehicle_number 的最后一个对象),并且需要再次填充/推送到表中。 这是我尝试过的代码。
<div>
<table>
<tr *ngFor="let x of groupList">
<td>{{x.vehicle_number}}</td>
<td>{{x.status}}</td>
</tr>
</table>
</div>
import { Component, OnInit } from '@angular/core';
@Component({
selector: 'app-home',
templateUrl: './home.component.html',
styleUrls: ['./home.component.css']
})
export class HomeComponent implements OnInit {
imageSource :any;
statusdata1: any;
vehicle_number:any;
groupList:any = [];
constructor() {}
ngOnInit() {
/* First data */
this.statusdata1 = {"vehicle_number":1,"status":"red"};
this.groupList.push(this.statusdata1);
console.log(this.groupList);
/* second data */
setTimeout (() => {
this.statusdata1 = {"vehicle_number":1,"status":"green"};
this.groupList.push(this.statusdata1);
console.log(this.groupList);
}, 5000);
/* Third data */
setTimeout (() => {
this.statusdata1 = {"vehicle_number":2,"status":"yellow"};
this.groupList.push(this.statusdata1);
console.log(this.groupList);
}, 10000);
}
}
您可以编写一个快速函数来更新值,如下所示
private updateGroupList(statusData: any) {
for (const key in this.groupList) {
if (this.groupList[key].vehicle_number === statusData.vehicle_number) {
this.groupList[key].status = statusData.status;
return;
}
}
this.groupList.push(statusData);
}
而你可以替换所有this.groupList.push()
在ngOnInit()
与this.updateGroupList(this.statusdata1)
ngOnInit() {
/* First data */
this.statusdata1 = {"vehicle_number":1,"status":"red"};
this.updateGroupList(this.statusdata1);
console.log(this.groupList);
/* Second data */
setTimeout (() => {
this.statusdata1 = {"vehicle_number":1,"status":"green"};
this.updateGroupList(this.statusdata1);
console.log(this.groupList);
}, 5000);
/* Third data */
setTimeout (() => {
this.statusdata1 = {"vehicle_number":2,"status":"yellow"};
this.updateGroupList(this.statusdata1);
console.log(this.groupList);
}, 10000);
}
工作示例: Stackblitz
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