Javascript RxJS 5 Observable和Angular2 http:调用ajax一次,保存结果,随后的ajax调用使用缓存的结果
下面的代码是我目前拥有的代码的简化版本: name.service.tsJavascript RxJS 5 Observable和Angular2 http:调用ajax一次,保存结果,随后的ajax调用使用缓存的结果,javascript,ajax,angular,rxjs5,Javascript,Ajax,Angular,Rxjs5,下面的代码是我目前拥有的代码的简化版本: name.service.ts @Injectable() export class NameService { const nameURL = "http://www.example.com/name"; getName() { return this.http.get(nameURL); } } @Component({ templateUrl: './name1.component.html',
@Injectable()
export class NameService {
const nameURL = "http://www.example.com/name";
getName() {
return this.http.get(nameURL);
}
}
@Component({
templateUrl: './name1.component.html',
styleUrls: ['./name1.component.css']
})
export class Name1Component implmenets OnInit {
private name1;
constructor(
private nameService: NameService
){}
ngOnInit() {
this.setupName();
}
private setupName() {
this.nameService.getName()
.subscribe(
resp => this.name1 = resp,
error => this.name1 = "unknown"
);
}
}
@Component({
templateUrl: './name2.component.html',
styleUrls: ['./name2.component.css']
})
export class Name2Component implmenets OnInit {
private name2;
constructor(
private nameService: NameService
){}
ngOnInit() {
this.setupName();
}
private setupName() {
this.nameService.getName()
.subscribe(
resp => this.name2 = resp,
error => this.name2 = "unknown"
);
}
}
name1.component.ts
@Injectable()
export class NameService {
const nameURL = "http://www.example.com/name";
getName() {
return this.http.get(nameURL);
}
}
@Component({
templateUrl: './name1.component.html',
styleUrls: ['./name1.component.css']
})
export class Name1Component implmenets OnInit {
private name1;
constructor(
private nameService: NameService
){}
ngOnInit() {
this.setupName();
}
private setupName() {
this.nameService.getName()
.subscribe(
resp => this.name1 = resp,
error => this.name1 = "unknown"
);
}
}
@Component({
templateUrl: './name2.component.html',
styleUrls: ['./name2.component.css']
})
export class Name2Component implmenets OnInit {
private name2;
constructor(
private nameService: NameService
){}
ngOnInit() {
this.setupName();
}
private setupName() {
this.nameService.getName()
.subscribe(
resp => this.name2 = resp,
error => this.name2 = "unknown"
);
}
}
name2.component.ts
@Injectable()
export class NameService {
const nameURL = "http://www.example.com/name";
getName() {
return this.http.get(nameURL);
}
}
@Component({
templateUrl: './name1.component.html',
styleUrls: ['./name1.component.css']
})
export class Name1Component implmenets OnInit {
private name1;
constructor(
private nameService: NameService
){}
ngOnInit() {
this.setupName();
}
private setupName() {
this.nameService.getName()
.subscribe(
resp => this.name1 = resp,
error => this.name1 = "unknown"
);
}
}
@Component({
templateUrl: './name2.component.html',
styleUrls: ['./name2.component.css']
})
export class Name2Component implmenets OnInit {
private name2;
constructor(
private nameService: NameService
){}
ngOnInit() {
this.setupName();
}
private setupName() {
this.nameService.getName()
.subscribe(
resp => this.name2 = resp,
error => this.name2 = "unknown"
);
}
}
下面是我想做的,name1.component.ts
将首先调用NameService
类的getName
方法<然后,code>getName将进行ajax调用并返回一个可观察的
接下来,name2.component.ts
还将调用与NameService
类相同的getName
方法,并且getName
还将执行相同的ajax调用并返回一个可观察的
是否可以使用rxjs当
NameService
中的getName
方法进行第一次ajax调用时,它会存储ajax调用的结果。对getName
方法的任何后续函数调用都将返回第一个ajax调用的缓存结果,而不会执行另一个冗余ajax 您可以多次订阅Observable,因此,如果您只想保存两个组件之间共享数据的第二个网络请求,您可以将其缓存在服务中,如下所示:
@Injectable()
export class NameService {
const nameURL = "http://www.example.com/name";
private cache: Observable<any>;
getName() {
return this.cache || this.cache = this.http.get(nameURL);
}
}
@Injectable()
导出类名称服务{
常量nameURL=”http://www.example.com/name";
私有缓存:可观察;
getName(){
返回this.cache | | this.cache=this.http.get(nameURL);
}
}
尝试将这些值保存在浏览器的本地存储中。首先检查localstorage,如果值不存在,则调用服务器,否则从localstorage检索并使用它。以下是链接:@rashfmnb我更喜欢rxjs解决方案。@IgorJanković我阅读了您共享的链接,并尝试在我的代码中实现它。但它不起作用。我仍然在浏览器中看到2个网络请求,而不是1个。请检查此答案