[英]How to handle closures in TypeScript (Angular injections)?
I have an Angular factory service in JavaScript that I defined like this: 我在JavaScript中定义了一个Angular工厂服务,如下所示:
app.service('MyServiceFactory', ['$http', '$timeout', '$interval',
function($http, $timeout, $interval) {
function MyService() {
// I can use all injected values here without additional efforts
}
this.Create = function() {
return new MyService();
}
}]);
Now I want to convert it into TypeScript: 现在,我想将其转换为TypeScript:
module Services {
export class MyServiceFactory {
static $inject: string[] = ['$timeout', '$interval', '$http'];
constructor(
private timeout: angular.ITimeoutService,
private interval: angular.IIntervalService,
private http: angular.IHttpService) {
}
public create(): MyService { return new MyService(); };
}
export class MyService() {
// I have a problem here. I need to redefine and
// initialize all variables, injected into my factory class
}
angular.module('MyModule').service('MyServiceFactory', MyServiceFactory);
}
Do you see what I mean? 你明白我的意思吗? TypeScript does not allow nested classes, which could have solved the issue.
TypeScript不允许使用嵌套类,而嵌套类可以解决此问题。 Also TypeScript solution looks very uncool.
此外,TypeScript解决方案看起来也很酷。 Is there a more elegant solution?
有没有更优雅的解决方案?
Instead of : 代替 :
export class MyService() {
// I have a problem here. I need to redefine and
// initialize all variables, injected into my factory class
}
You can put the Create
on MyServiceFactory
ie: 您可以将
Create
放在MyServiceFactory
即:
module Services {
export class MyServiceFactory {
static $inject: string[] = ['$timeout', '$interval', '$http'];
constructor(
private timeout: angular.ITimeoutService,
private interval: angular.IIntervalService,
private http: angular.IHttpService) {
}
public create(){
// Use the revealing module pattern
// And let the compiler infer the return type
// e.g.
var foo = 23;
return {
foo
}
};
}
angular.module('MyModule').service('MyServiceFactory', MyServiceFactory);
}
Please note that valid JavaScript is valid TypeScript ( more ) 请注意,有效的JavaScript是有效的TypeScript( 更多 )
You can pass the injected variables as parameters to your other class, eg: 您可以将注入的变量作为参数传递给其他类,例如:
export class MyServiceFactory {
static $inject: string[] = ['$timeout', '$interval', '$http'];
constructor(
private timeout: angular.ITimeoutService,
private interval: angular.IIntervalService,
private http: angular.IHttpService) {
}
public create(): MyService {
return new MyService(this.timeout, this.interval, this.http);
}
}
export class MyService {
constructor(
private timeout: angular.ITimeoutService,
private interval: angular.IIntervalService,
private http: angular.IHttpService) {
// no more problems here, you can play with the injected variables again
}
}
angular.module('MyModule').service('MyServiceFactory', MyServiceFactory);
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