[英]Angular2 How to POST data using a service class
我有一個簡單的申請表,我試圖發布到服務器。 我對Angular2很新
如何將數據從組件傳遞到服務並傳遞到服務器以獲取POST請求。
當我直接從FireFox插件'httpRequester'嘗試它時,POST工作正常
這是TaskComponent.ts
@Component({
selector: 'tasks',
template: `<div mdl class="mdl-grid demo-content">
<div class="demo-graphs mdl-shadow--2dp mdl-color--white mdl-cell mdl-cell--8-col">
<h3>Create Task Page</h3>
<form action="#" (ngSubmit)="onSubmit()">
<div class="mdl-textfield mdl-js-textfield mdl-textfield--floating-label">
<input class="mdl-textfield__input" type="text" pattern="[A-Z,a-z]*" id="taskname" [(ngModel)]="data.taskname"/>
<label class="mdl-textfield__label" for="taskname">Task Name</label>
<span class="mdl-textfield__error">Only alphabet and no spaces, please!</span>
</div>
<button class="mdl-button mdl-js-button mdl-button--raised mdl-button--colored" type="submit">Create Task</button>
</form>
`,
directives: [ROUTER_DIRECTIVES, MDL]
})
export class CreateTaskComponent {
data: any
constructor() {
this.data = {
//taskname: 'Example Task'
};
}
onSubmit(form) {
console.log(this.data.taskname); <--Data is passed upon submit onto the console. Works fine.
//Need to call the postApartment method of ApartmentService
}
}
ApartmentService.ts
import {Http, Response} from 'angular2/http'
import {Injectable} from 'angular2/core'
import 'rxjs/add/operator/map';
@Injectable()
export class ApartmentService {
http: Http;
constructor(http: Http) {
this.http = http;
}
getEntries() {
return this.http.get('./api/apartments').map((res: Response) => res.json());
}
getProfile(userEmail :string){
return this.http.get(`./api/apartments/getprofile/${userEmail}`).map((res: Response) => res.json());
}
postApartment(){
// Not familiar with the syntax here
}
}
Server.ts
router.route('/api/apartments')
.post(function(req, res) {
var apartment = new Apartment();
apartment.name = req.body.name;
apartment.save(function(err) {
if (err)
res.send(err);
res.json({ message: 'Apartment created!' });
});
})
您可以通過依賴注入注入服務並在組件中使用它
export class CreateTaskComponent {
constructor(){private _apartmentService: ApartmentService}{}
}
您可以通過任何組件功能訪問它
onSubmit(form) {
console.log(this.data.taskname); <--Data is passed upon submit onto the console. Works fine.
//Need to call the postApartment method of ApartmentService
this._apartmentService.postApartment()
}
在引導組件時,您必須將其作為依賴項添加
bootstrap(AppComponent, [ApartmentService]);
執行最后一步的另一個選擇是在Component裝飾器中添加提供程序
@Component{
providers: [ApartmentService]
}
在組件中注入apartmentService,不需要提供者,因為我已經引導它。 (如果您啟動該服務,請不要將其包含在提供程序中。它會破壞系統)
export class CreateTaskComponent {
data: any
constructor(private apartmentService: ApartmentService) {
this.data = {};
}
onSubmit(form) {
this.apartmentService.postApartment(this.data);
}
}
關鍵部分是服務中的postApartment()方法
postApartment(data :any){
return this.http.post('/api/apartments',
JSON.stringify(data),{headers : new Headers({'Content-Type':'application/json'})
})
.map((res: Response) => res.json()).subscribe();
}
還要確保在server.js代碼上,mongoose字段與傳遞的http body參數匹配。 我不得不修復它以使其工作。
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