在来自 url 的页面之间传递数据

Question

我正在从事 ionic 4 项目。我的项目正在使用输入搜索从 url 获取数据 json。我希望在用户单击任何项目时传递数据以向他们显示另一个页面以获取更多详细信息。我尝试使用此代码但我得到未定义的值！

此代码正在进行搜索操作

export class FlightsearchPage {
  public search = ''
  public flight : any
  filterItems:any;
  callsign : any;
  constructor(private http: HTTP, public loadingController: LoadingController, private nav : NavController) {

    this.addThemFunction
  }

  keyPressed(event: any) { /
    console.log(event.target.value); 
  this.addThemFunction(event.target.value);
  }

 async addThemFunction(search){

  this.http.get('/web/find?query='+search+'', {}, {})
  .then(data => {

    const parsed = JSON.parse(data.data);
    this.flight = parsed.results;
    this.filterItems= this.flight;
    this.callsign = this.flight.detail.flight

    /// here l am try to pass value callsign to page details /// 

    this.nav.navigateForward(`/flightserachdetails/${this.callsign}`)

    }), err=>{
    }
  }


    }

详情搜索

 <ion-content padding>
      <ion-item>
          <ion-label position="floating">Enter your flight number</ion-label>
          <ion-input [(ngModel)]="search" (keyup)="keyPressed($event)" placeholder="Ex : iaw556"></ion-input>
        </ion-item>

  <ion-item *ngFor="let item of flight"  routerDirection="forward">
      <ion-label>
        <ion-text color="primary">
            <h3 [routerLink]="['/flightserachdetails', id]">{{item.label}}</h3>
          </ion-text>
          <p>{{item.name}}</p>
      </ion-label>
    </ion-item>

</ion-content>

此代码正在从上面的代码中获取数据

export class FlightserachdetailsPage {

  public flight : any
  callsignId = null

  constructor(private http: HTTP, public loadingController: LoadingController, private nav: NavController,private activatedRoute: ActivatedRoute) {


    this.callsignId = this.activatedRoute.snapshot.paramMap.get('id')           





}

用于显示上面另一页的数据。

<ion-content padding>
   {{callsignId}}
   {{flight.request.fetchBy}}
</ion-content>

json 回复

{
  "results": [
    {
      "id": "IA107",
      "label": "IA107",
      "detail": {
        "callsign": "IAW107",
        "flight": "IA107", 
       "fetchBy": "IA107"
      },
      "type": "schedule",
    }
  ]
}

我很抱歉乱码。有什么建议或给我另一个代码示例吗？

Answer 1

您正在同时进行查询和导航，因此请将其从 addThemFunction(search) 中删除。

async addThemFunction(search){

    this.http.get('/web/find?query='+search+'', {}, {})
       .then(data => {

          const parsed = JSON.parse(data.data);
          this.flight = parsed.results;
          this.filterItems= this.flight[0];
          this.callsign = this.flight.detail.flight

        }
     }
}

您需要从 addThemFunction(search) 功能中删除导航并创建一个新的导航功能，以便在单击项目时进行导航。

navigate(id){
    this.nav.navigateForward(`/flightserachdetails/${id}`);
}

并从 h3 中删除 routerLink 并在单击项目时调用 navigate() 函数并在该函数中传递 id。

<ion-item *ngFor="let item of flight"  routerDirection="forward">
  <ion-label>
    <ion-text color="primary">
        <h3 (click)="navigate(item.id)">{{item.label}}</h3>
      </ion-text>
      <p>{{item.name}}</p>
  </ion-label>
</ion-item>

要传递完整的对象：

`this.router.navigate(['flightserachdetails'], item);

constructor(private activatedRoute: ActivatedRoute) {
   this.activatedRoute.queryParams.subscribe(resp => {
       console.log(resp);
   });

在来自 url 的页面之间传递数据

Passing Data between pages from url

angular

ionic4