Angular 角度4:如何将参数传递给模块文件中提供的服务
我打电话向你寻求关于在这里使用什么方法的帮助:我已经测试了很多东西来解决我的问题,我至少有4个可行的解决方案,但我不知道哪一个(s)是最好的,如果其中一些工作只是因为我做过的其他事情的副作用,不应该使用 我在文档中找不到任何东西可以指出这些解决方案中的一个(或另一个) 首先,我的情况是这样的:我正在构建一个应用程序,该应用程序连接到数据API并构建不同的部分,每个部分都包含dataviz 我将站点的各个部分构建为模块,但它们共享一个名为DataService的服务(每个模块都将使用DataService来获取和处理数据) 我的DataService需要一个配置文件,其中包含许多特定于每个部分的选项,并存储在它自己的文件夹中 因此,我需要在module.ts文件的providers部分为每个部分分别提供DataService,避免将DataService复制到每个模块似乎是一种好的做法 因此,文件的体系结构将是:Angular 角度4:如何将参数传递给模块文件中提供的服务,angular,angular2-services,Angular,Angular2 Services,我打电话向你寻求关于在这里使用什么方法的帮助:我已经测试了很多东西来解决我的问题,我至少有4个可行的解决方案,但我不知道哪一个(s)是最好的,如果其中一些工作只是因为我做过的其他事情的副作用,不应该使用 我在文档中找不到任何东西可以指出这些解决方案中的一个(或另一个) 首先,我的情况是这样的:我正在构建一个应用程序,该应用程序连接到数据API并构建不同的部分,每个部分都包含dataviz 我将站点的各个部分构建为模块,但它们共享一个名为DataService的服务(每个模块都将使用DataSer
--Dashboard module
----data.service.ts
----Section1 module
------Section1 config file
----Section2 module
------Section2 config file
我尝试了多个在节模块文件中似乎都有效的方法:
import { DataService } from '../services/data.service';
import viewConfig from './view.config.json';
@NgModule({
imports: [ ... ],
declarations: [ ... ],
providers: [
{ provide: 'VIEW_CONFIG', useValue: viewConfig },
DataService,
]})
export class Section1Module { }
import { DataService } from '../services/data.service';
import viewConfig from './view.config.json';
export let VIEW_CONFIG = new InjectionToken<any>('');
let dataServiceFactory = (configObject):DataService => {
return new DataService(configObject)
}
@NgModule({
imports: [ ... ],
declarations: [ ... ],
providers: [
{ provide: VIEW_CONFIG, useValue: viewConfig },
{
provide : DataService,
useFactory : dataServiceFactory,
deps : [VIEW_CONFIG]
},
]})
export class Section1Module { }
import { DataService } from '../services/data.service';
import viewConfig from './view.config.json';
@NgModule({
imports: [ ... ],
declarations: [ ... ],
providers: [
{ provide: DataService, useValue : new DataService(viewConfig) },
]})
export class Section1Module { }
import { DataService } from '../services/data.service';
import viewConfig from './view.config.json';
let dataServiceFactory = (configObject) => { return new DataService(configObject) }
@NgModule({
imports: [ ... ],
declarations: [ ... ],
providers: [
{ provide: DataService, useValue : dataServiceFactory(viewConfig) }
]})
export class Section1Module { }
export const VIEW_CONFIG = new InjectionToken<any>('');
@NgModule({
imports: [ ... ],
declarations: [ ... ],
providers: [
{ provide: VIEW_CONFIG, useValue: viewConfig },
{ provide : DataService,
useFactory: dataServiceFactory,
deps : [VIEW_CONFIG] }
]})
export class Section1Module { }
解决方案1:注射
(即使我在任何地方都看不到这一点,我也无法在没有引号的情况下让注射发挥作用)
模块文件:
import { DataService } from '../services/data.service';
import viewConfig from './view.config.json';
@NgModule({
imports: [ ... ],
declarations: [ ... ],
providers: [
{ provide: 'VIEW_CONFIG', useValue: viewConfig },
DataService,
]})
export class Section1Module { }
import { DataService } from '../services/data.service';
import viewConfig from './view.config.json';
export let VIEW_CONFIG = new InjectionToken<any>('');
let dataServiceFactory = (configObject):DataService => {
return new DataService(configObject)
}
@NgModule({
imports: [ ... ],
declarations: [ ... ],
providers: [
{ provide: VIEW_CONFIG, useValue: viewConfig },
{
provide : DataService,
useFactory : dataServiceFactory,
deps : [VIEW_CONFIG]
},
]})
export class Section1Module { }
import { DataService } from '../services/data.service';
import viewConfig from './view.config.json';
@NgModule({
imports: [ ... ],
declarations: [ ... ],
providers: [
{ provide: DataService, useValue : new DataService(viewConfig) },
]})
export class Section1Module { }
import { DataService } from '../services/data.service';
import viewConfig from './view.config.json';
let dataServiceFactory = (configObject) => { return new DataService(configObject) }
@NgModule({
imports: [ ... ],
declarations: [ ... ],
providers: [
{ provide: DataService, useValue : dataServiceFactory(viewConfig) }
]})
export class Section1Module { }
export const VIEW_CONFIG = new InjectionToken<any>('');
@NgModule({
imports: [ ... ],
declarations: [ ... ],
providers: [
{ provide: VIEW_CONFIG, useValue: viewConfig },
{ provide : DataService,
useFactory: dataServiceFactory,
deps : [VIEW_CONFIG] }
]})
export class Section1Module { }
节文件:
@Injectable()
export class DataService {
constructor(@Inject('VIEW_CONFIG') private viewConfig : any) {}
}
@Injectable()
export class DataService {
constructor(private viewConfig : any) {}
}
@Injectable()
export class DataService {
constructor(private viewConfig : any) {}
}
@Injectable()
export class DataService {
constructor(private viewConfig : any) {}
}
@Injectable()
export class DataService {
constructor(private viewConfig : any) {}
}
export function dataServiceFactory(configObject) {
return new DataService(configObject);
}
解决方案2:工厂供应商
重新启动后不工作(请参阅更新)
灵感来自
模块文件:
import { DataService } from '../services/data.service';
import viewConfig from './view.config.json';
@NgModule({
imports: [ ... ],
declarations: [ ... ],
providers: [
{ provide: 'VIEW_CONFIG', useValue: viewConfig },
DataService,
]})
export class Section1Module { }
import { DataService } from '../services/data.service';
import viewConfig from './view.config.json';
export let VIEW_CONFIG = new InjectionToken<any>('');
let dataServiceFactory = (configObject):DataService => {
return new DataService(configObject)
}
@NgModule({
imports: [ ... ],
declarations: [ ... ],
providers: [
{ provide: VIEW_CONFIG, useValue: viewConfig },
{
provide : DataService,
useFactory : dataServiceFactory,
deps : [VIEW_CONFIG]
},
]})
export class Section1Module { }
import { DataService } from '../services/data.service';
import viewConfig from './view.config.json';
@NgModule({
imports: [ ... ],
declarations: [ ... ],
providers: [
{ provide: DataService, useValue : new DataService(viewConfig) },
]})
export class Section1Module { }
import { DataService } from '../services/data.service';
import viewConfig from './view.config.json';
let dataServiceFactory = (configObject) => { return new DataService(configObject) }
@NgModule({
imports: [ ... ],
declarations: [ ... ],
providers: [
{ provide: DataService, useValue : dataServiceFactory(viewConfig) }
]})
export class Section1Module { }
export const VIEW_CONFIG = new InjectionToken<any>('');
@NgModule({
imports: [ ... ],
declarations: [ ... ],
providers: [
{ provide: VIEW_CONFIG, useValue: viewConfig },
{ provide : DataService,
useFactory: dataServiceFactory,
deps : [VIEW_CONFIG] }
]})
export class Section1Module { }
解决方案3:具有直接实例的自定义提供程序
重新启动后不工作(请参阅更新)
模块文件:
import { DataService } from '../services/data.service';
import viewConfig from './view.config.json';
@NgModule({
imports: [ ... ],
declarations: [ ... ],
providers: [
{ provide: 'VIEW_CONFIG', useValue: viewConfig },
DataService,
]})
export class Section1Module { }
import { DataService } from '../services/data.service';
import viewConfig from './view.config.json';
export let VIEW_CONFIG = new InjectionToken<any>('');
let dataServiceFactory = (configObject):DataService => {
return new DataService(configObject)
}
@NgModule({
imports: [ ... ],
declarations: [ ... ],
providers: [
{ provide: VIEW_CONFIG, useValue: viewConfig },
{
provide : DataService,
useFactory : dataServiceFactory,
deps : [VIEW_CONFIG]
},
]})
export class Section1Module { }
import { DataService } from '../services/data.service';
import viewConfig from './view.config.json';
@NgModule({
imports: [ ... ],
declarations: [ ... ],
providers: [
{ provide: DataService, useValue : new DataService(viewConfig) },
]})
export class Section1Module { }
import { DataService } from '../services/data.service';
import viewConfig from './view.config.json';
let dataServiceFactory = (configObject) => { return new DataService(configObject) }
@NgModule({
imports: [ ... ],
declarations: [ ... ],
providers: [
{ provide: DataService, useValue : dataServiceFactory(viewConfig) }
]})
export class Section1Module { }
export const VIEW_CONFIG = new InjectionToken<any>('');
@NgModule({
imports: [ ... ],
declarations: [ ... ],
providers: [
{ provide: VIEW_CONFIG, useValue: viewConfig },
{ provide : DataService,
useFactory: dataServiceFactory,
deps : [VIEW_CONFIG] }
]})
export class Section1Module { }
节文件:
@Injectable()
export class DataService {
constructor(@Inject('VIEW_CONFIG') private viewConfig : any) {}
}
@Injectable()
export class DataService {
constructor(private viewConfig : any) {}
}
@Injectable()
export class DataService {
constructor(private viewConfig : any) {}
}
@Injectable()
export class DataService {
constructor(private viewConfig : any) {}
}
@Injectable()
export class DataService {
constructor(private viewConfig : any) {}
}
export function dataServiceFactory(configObject) {
return new DataService(configObject);
}
解决方案4:带有工厂的自定义提供商
重新启动后不工作(请参阅更新)
非常类似于解决方案3
模块文件:
import { DataService } from '../services/data.service';
import viewConfig from './view.config.json';
@NgModule({
imports: [ ... ],
declarations: [ ... ],
providers: [
{ provide: 'VIEW_CONFIG', useValue: viewConfig },
DataService,
]})
export class Section1Module { }
import { DataService } from '../services/data.service';
import viewConfig from './view.config.json';
export let VIEW_CONFIG = new InjectionToken<any>('');
let dataServiceFactory = (configObject):DataService => {
return new DataService(configObject)
}
@NgModule({
imports: [ ... ],
declarations: [ ... ],
providers: [
{ provide: VIEW_CONFIG, useValue: viewConfig },
{
provide : DataService,
useFactory : dataServiceFactory,
deps : [VIEW_CONFIG]
},
]})
export class Section1Module { }
import { DataService } from '../services/data.service';
import viewConfig from './view.config.json';
@NgModule({
imports: [ ... ],
declarations: [ ... ],
providers: [
{ provide: DataService, useValue : new DataService(viewConfig) },
]})
export class Section1Module { }
import { DataService } from '../services/data.service';
import viewConfig from './view.config.json';
let dataServiceFactory = (configObject) => { return new DataService(configObject) }
@NgModule({
imports: [ ... ],
declarations: [ ... ],
providers: [
{ provide: DataService, useValue : dataServiceFactory(viewConfig) }
]})
export class Section1Module { }
export const VIEW_CONFIG = new InjectionToken<any>('');
@NgModule({
imports: [ ... ],
declarations: [ ... ],
providers: [
{ provide: VIEW_CONFIG, useValue: viewConfig },
{ provide : DataService,
useFactory: dataServiceFactory,
deps : [VIEW_CONFIG] }
]})
export class Section1Module { }
节文件:
@Injectable()
export class DataService {
constructor(@Inject('VIEW_CONFIG') private viewConfig : any) {}
}
@Injectable()
export class DataService {
constructor(private viewConfig : any) {}
}
@Injectable()
export class DataService {
constructor(private viewConfig : any) {}
}
@Injectable()
export class DataService {
constructor(private viewConfig : any) {}
}
@Injectable()
export class DataService {
constructor(private viewConfig : any) {}
}
export function dataServiceFactory(configObject) {
return new DataService(configObject);
}
解决方案5
使用从服务文件导出的工厂和注入令牌
模块文件:
import { DataService } from '../services/data.service';
import viewConfig from './view.config.json';
@NgModule({
imports: [ ... ],
declarations: [ ... ],
providers: [
{ provide: 'VIEW_CONFIG', useValue: viewConfig },
DataService,
]})
export class Section1Module { }
import { DataService } from '../services/data.service';
import viewConfig from './view.config.json';
export let VIEW_CONFIG = new InjectionToken<any>('');
let dataServiceFactory = (configObject):DataService => {
return new DataService(configObject)
}
@NgModule({
imports: [ ... ],
declarations: [ ... ],
providers: [
{ provide: VIEW_CONFIG, useValue: viewConfig },
{
provide : DataService,
useFactory : dataServiceFactory,
deps : [VIEW_CONFIG]
},
]})
export class Section1Module { }
import { DataService } from '../services/data.service';
import viewConfig from './view.config.json';
@NgModule({
imports: [ ... ],
declarations: [ ... ],
providers: [
{ provide: DataService, useValue : new DataService(viewConfig) },
]})
export class Section1Module { }
import { DataService } from '../services/data.service';
import viewConfig from './view.config.json';
let dataServiceFactory = (configObject) => { return new DataService(configObject) }
@NgModule({
imports: [ ... ],
declarations: [ ... ],
providers: [
{ provide: DataService, useValue : dataServiceFactory(viewConfig) }
]})
export class Section1Module { }
export const VIEW_CONFIG = new InjectionToken<any>('');
@NgModule({
imports: [ ... ],
declarations: [ ... ],
providers: [
{ provide: VIEW_CONFIG, useValue: viewConfig },
{ provide : DataService,
useFactory: dataServiceFactory,
deps : [VIEW_CONFIG] }
]})
export class Section1Module { }
我愿意接受任何关于“什么是正确的解决方案?”甚至“这些解决方案中的正确解决方案是什么?”的批评、想法和任何类型的新领导 非常感谢D
更新 有一次,我意识到我的Angular CLI行为异常,如果我关闭本地服务器并执行“ng服务”,其中一些方法将无法工作。 更奇怪的是,它在杀死CLI本地服务器并重新启动后就不工作了,但下次我保存文件并重新编译CLI时,它工作得很好 解决方案1:仍在工作 解决方案2/解决方案3:失败并出现错误:
Error encountered resolving symbol values statically. Calling function
'DataService', function calls are not supported. Consider replacing the
function or lambda with a reference to an exported function
解决方案4:失败并出现错误:
Error encountered resolving symbol values statically. Reference to a non-exported function
添加了解决方案5我使用视图配置数据的方法如下: 我的配置文件:
export const IBO_DETAILS_GENERAL = {
iboCode: 'IBOsFormCodeField',
iboGivenName: 'IBOsFormGivenNameField',
iboFamilyName: 'IBOsFormFamilyNameField',
iboEmail: 'IBOsFormEmailField',
};
export const IBO_DETAILS_ACCOUNT = [];
import { IBO_DETAILS_GENERAL } from './ibo-details-formfields';
@Component({
selector: 'ibo-details-general',
templateUrl: './ibo-details-general.component.html',
styles: [],
})
export class IboDetailsGeneral extends FilterDataMappingManipulator implements OnInit, OnDestroy {
// Initial constants,vectors and component mapping
private formFields = IBO_DETAILS_GENERAL;
我的视图组件:
export const IBO_DETAILS_GENERAL = {
iboCode: 'IBOsFormCodeField',
iboGivenName: 'IBOsFormGivenNameField',
iboFamilyName: 'IBOsFormFamilyNameField',
iboEmail: 'IBOsFormEmailField',
};
export const IBO_DETAILS_ACCOUNT = [];
import { IBO_DETAILS_GENERAL } from './ibo-details-formfields';
@Component({
selector: 'ibo-details-general',
templateUrl: './ibo-details-general.component.html',
styles: [],
})
export class IboDetailsGeneral extends FilterDataMappingManipulator implements OnInit, OnDestroy {
// Initial constants,vectors and component mapping
private formFields = IBO_DETAILS_GENERAL;
这样,我在formFields
中设置了config
。我可以在这个组件范围内的任何地方使用它
我目前正在使用它生成动态表单字段(输入、选择等),这取决于我从API调用中获得的数据
但是您可以使用该对象(formFields
,在我的例子中)查找您需要的内容,并将其作为参数发送到您的服务
此外,在将共享服务提升到更高级别方面做得很好。我相信这是最好的办法。但是我不会将它添加到每个组件的提供者中,我会将它添加到组件的模块中。像这样:
@NgModule({
declarations: [
ChildComp1,
ChildComp2
],
imports: [
],
providers: [
SharedService
]
})
export class SectionModule {
}
这样,ChildComp1
和ChildComp2
就可以访问SharedService
,而无需将其添加到组件的代码中
例如,当您定义一个用户部分时,这可以很好地工作。比如说,UsersModule
您在providers
中声明您的UsersSharedService
,然后在声明中声明您的UsersLeftPanel
和UsersRightPanel
(示例)
更新1:
export const IBO_DETAILS_GENERAL = {
iboCode: 'IBOsFormCodeField',
iboGivenName: 'IBOsFormGivenNameField',
iboFamilyName: 'IBOsFormFamilyNameField',
iboEmail: 'IBOsFormEmailField',
};
export const IBO_DETAILS_ACCOUNT = [];
import { IBO_DETAILS_GENERAL } from './ibo-details-formfields';
@Component({
selector: 'ibo-details-general',
templateUrl: './ibo-details-general.component.html',
styles: [],
})
export class IboDetailsGeneral extends FilterDataMappingManipulator implements OnInit, OnDestroy {
// Initial constants,vectors and component mapping
private formFields = IBO_DETAILS_GENERAL;
在服务中使用配置的示例
i创建共享服务具有此方法的引擎:
getData() {
// do Stuff
let myData = {}; // Result of the stuff we did
this.dataSubject.next(myData);
}
在组件中,您可以这样称呼它:
this.myService.getData();
对吧?
现在,还记得我们声明了配置吗?将其添加到通话中
this.myService.getData(this.formFields);
在我们的服务中:
getData(currentConfig) {
// do Stuff depending on currentConfig obj received as parameter
let myData = {}; // Result of the stuff we did
this.dataSubject.next(myData);
}
这样,您就可以调用通过不同配置的共享服务的getData()
方法。这样,您就不必将服务包含在许多提供商中,也不必复制/粘贴处理配置的逻辑,您的共享服务中就有了配置,因此,您的所有孩子都可以访问它
更新2:
export const IBO_DETAILS_GENERAL = {
iboCode: 'IBOsFormCodeField',
iboGivenName: 'IBOsFormGivenNameField',
iboFamilyName: 'IBOsFormFamilyNameField',
iboEmail: 'IBOsFormEmailField',
};
export const IBO_DETAILS_ACCOUNT = [];
import { IBO_DETAILS_GENERAL } from './ibo-details-formfields';
@Component({
selector: 'ibo-details-general',
templateUrl: './ibo-details-general.component.html',
styles: [],
})
export class IboDetailsGeneral extends FilterDataMappingManipulator implements OnInit, OnDestroy {
// Initial constants,vectors and component mapping
private formFields = IBO_DETAILS_GENERAL;
按照您的解决方案5方法,我认为您缺少了multi:true
试试这个:
export function dataServiceFactory(configObject) {
return () => new DataService(configObject);
}
providers: [
{ provide: VIEW_CONFIG, useValue: viewConfig },
{ provide : DataService,
useFactory: dataServiceFactory,
deps : [VIEW_CONFIG],
multi: true }
]})
导出函数中的return
是键:return()=>
这就是我在我的项目中使用它的方式:
export function initConfigFactory(userConfig: UserConfig) {
return () => userConfig.getUsersConfig();
}
其中,userConfig.getUsersConfig()
是获取用户配置的服务调用
providers: [
{
provide: APP_INITIALIZER,
useFactory: initConfigFactory,
deps: [UserConfig],
multi: true
}
]
这与您的解决方案5非常接近,请尝试 据我所知,你不需要你的服务有一个特定的配置文件,所以你可以共享一个在你的父母提供的实例。我需要单独实例化我的服务,因为它将为每个子模块使用不同的配置信息,所以我无法在顶层提供它。。。除非我还错过了什么…@SophieJobez嗨!我更新了我的答案。希望我们能解释清楚,尽了我最大的努力。告诉我你觉得有用吗!;)你好我理解你的答案(谢谢你花时间!),我没有这样做是因为一种“对象范式”的思维方式让我认为,一次实例化我的服务并进行所有必要的确认会更干净