我目前正在制作一个小应用程序，用户可以将联系人添加到列表中。我能够将联系人添加到列表中它显示在一个单独的div中，当我点击保存时，我有一些代码基本上有await，整个应用刷新。我目前遇到的问题是，当我为用户插入数据并单击保存时，它会刷新整个屏幕，但当我单击保存时，我希望它只刷新联系人组件。
我目前有一段代码，基本上刷新所有的组件，这是好的，但现在我想尝试只是刷新组件，我已经添加了数据。
我包含了下面的代码:
<div class="container">
<div class="main-contact-list">
<h2>Contacts</h2>
<li *ngFor="let contact of contacts;">
<button type="button" (click)="getContact(contact.id)">
<span class="name"> {{contact.firstName}} {{contact.lastName}}</span>
</button>
</li>
</div>
<div class="form">
<form [formGroup]="fg">
<div class="actionBtns">
<button class="btn btn-primary" (click)="saveContact()">Edit/Save</button>
<div class="divider"></div>
<button class="btn btn-primary" (click)="deleteContact(contact.id)">Delete</button>
</div>
<div class="row" class="row-object">
<input type="text" class="form-control" [(ngModel)]="contact.firstName" name="firstName"
formControlName="firstName" placeholder="First Name" />
<div class="divider"></div>
<input type="text" class="form-control" [(ngModel)]="contact.lastName" name="lastName"
formControlName="lastName" placeholder="Last Name" />
<div class="col">
<input type="text" class="form-control" [(ngModel)]="contact.emailAddress" name="emailAddress"
formControlName="emailAddress" placeholder="Email Address" />
<div class="divider"></div>
<input type="text" class="form-control" [(ngModel)]="contact.address1" name="address1"
formControlName="address1" placeholder="Address1" />
<div class="divider"></div>
<input type="text" class="form-control" [(ngModel)]="contact.address2" name="address2"
formControlName="address2" placeholder="Address2" />
<div class="divider"></div>
<input type="text" class="form-control" [(ngModel)]="contact.city" name="city"
formControlName="city" placeholder="City" />
<div class="divider"></div>
<input type="text" class="form-control" [(ngModel)]="contact.postCode" name="postCode"
formControlName="postCode" placeholder="Post Code" />
<div class="divider"></div>
</div>
</div>
</form>
<div class="activityForm" *ngIf="contact.id">
<app-activities [childItem]="contact"></app-activities>
</div>
</div>
import { Component, OnInit } from '@angular/core';
import {
FormBuilder,
FormControl,
FormGroup,
Validators,
FormsModule
} from '@angular/forms';
import { AppService } from '../app.service';
//interface for Contact
interface Contact {
id?: number;
firstName: string;
lastName: string;
emailAddress: string;
address1: string;
address2: string;
city: string;
postCode: string;
}
@Component({
selector: 'app-contact-details',
templateUrl: './contact-details.component.html',
styleUrls: ['./contact-details.component.css'],
})
export class ContactDetailsComponent implements OnInit {
constructor(private appService: AppService, private fb: FormBuilder) { }
fg!: FormGroup;
contacts: Contact[] = [];
contact: any = {};
//get the form field as a form control. it will useful for validation and etc
get firstNameField(): FormControl {
return this.fg.get('firstName') as FormControl;
}
get lastNameField(): FormControl {
return this.fg.get('lastName') as FormControl;
}
get emailAddressField(): FormControl {
return this.fg.get('emailAddress') as FormControl;
}
get address1Field(): FormControl {
return this.fg.get('address1') as FormControl;
}
get address2Field(): FormControl {
return this.fg.get('address2') as FormControl;
}
get postCodeField(): FormControl {
return this.fg.get('postCode') as FormControl;
}
async ngOnInit() {
this.initForm();
this.getContacts();
}
//form init. here we create the reactive form. https://angular.io/guide/reactive-forms
initForm(): void {
let id = Date.now() * Math.random();
this.fg = this.fb.group({
id: [id],
firstName: ['', [Validators.required]],
lastName: ['', [Validators.required]],
emailAddress: ['', [Validators.required, Validators.email]],
address1: ['', [Validators.required]],
address2: ['', [Validators.required]],
city: ['', [Validators.required]],
postCode: ['', [Validators.required]],
});
}
//save function
async saveContact() {
console.log(this.fg);
console.log(this.contact);
//if form doesn't have any validation error this if condition will executed
if (this.fg.valid) {
const newContact: Contact = {
firstName: this.fg.value.firstName,
lastName: this.fg.value.lastName,
emailAddress: this.fg.value.emailAddress,
address1: this.fg.value.address1,
address2: this.fg.value.address2,
city: this.fg.value.city,
postCode: this.fg.value.postCode,
};
if (this.contact?.id) {
this.appService
.editContacts(this.contact.id, newContact).subscribe();
} else {
this.appService
.addContacts(newContact).subscribe();
}
this.fg.reset(); //resetting the form array
await this.refresh();
} else {
console.log('this is invalid ');
}
}
refresh(): void {
window.location.reload();
}
async getContacts(): Promise<void> {
await this.appService
.getContacts()
.subscribe((contacts: any) => (this.contacts = contacts));
}
edit(id: number): void {
const data = this.contacts[id];
this.fg.patchValue(data);
this.refresh();
}
getContact(id: number | undefined) {
this.appService
.get(id)
.subscribe((contact: any) => (this.contact = contact));
}
selectContact(contact: Contact) {
this.contact = contact;
}
deleteContact(id: number | undefined) {
this.appService.deleteContact(id).subscribe();
this.refresh();
}
}
我确实设法解决了这个问题。大多数教程都说明你基本上使用路由器路由，所以当发生某些事情刷新路由时，它应该显示新页面。
相反，我只是在我的数组和对象前面添加了@Input，所以当在我的主HTML页面中，我使用*ngFor语句来迭代数组时，每次更新它都会自动显示新的列表