CODEWITHSUNDEEP
typescriptangularangular2-servicesangular2-http
Marco Jr
Marco Jr

Reputation: 6806

Angular 2 - displaying results after http request (Service)

I'm trying to iterate my results in my ngFor - it's not so intuitive like Angular 1. I've the following:

search.service.ts

import {Injectable} from 'angular2/core';
import {Http, HTTP_PROVIDERS, Response} from 'angular2/http';
import 'rxjs/add/operator/map';

@Injectable()
export class SearchService {

  constructor( private _http: Http ) {

  }

  DoGeneralSearch(s){   
    return this._http.get('http://localhost:6000/search?q=' + s)
     .map((res:Response) => res.json())
  } 
}

typeahead.ts

import {Component, Input, OnChanges} from "angular2/core";
import {SearchService} from "../../../services/search.service";

@Component({
  selector: "typeahead",
  providers: [SearchService],
  template : `
    <div>{{searchSvc | async | json}}</div>
    <div id="typeaheadRooms" *ngIf="searchSvc">
      <div class="typeaheadRowRooms" *ngFor="#item of searchSvc?.rooms">
        <div class="typeaheadRoomTitle">{{item.name}}}</div>
      </div>
      <div class="typeaheadRowRooms" *ngFor="#item of searchSvc?.colors">
        <div class="typeaheadRoomTitle">{{item.name}}}</div>
      </div>
`,
})
export class TypeaheadComponent implements OnChanges {

  @Input() txt: string;
  display = false;

  ngOnChanges(changes: {[propName: string]: SimpleChange}) {
    var search = changes['txt'].currentValue;
    if(search.length > 2) {
        this.display = true;
        this.searchSvc = this._searchService.DoGeneralSearch(search);
    }
    else
    {
        this.display = false;
    }
  }

  constructor(private _searchService: SearchService) {}
}

a typical results in json :

{  
"max":20,
"queryString":"chem",
"rooms":[  
  {  
     "name":"Lima"
  },
  {  
     "name":"Delta"
  }
 ],
"colors":[  
  {  
     "name":"Red"
  },
  {  
     "name":"Lime"
  }
 ]

}

What's happening ? Well, {{searchSvc | async | json}} show me results. But the ngFor: No :(

Any clues? thank you in advance !!!

Upvotes: 0

Views: 2340

Answers (1)

Thierry Templier
Thierry Templier

Reputation: 202216

In this case, you need to use this:

<div class="typeaheadRowRooms" *ngFor="#item of searchSvc | async">

and update your service like this:

DoGeneralSearch(s){   
  return this._http.get('http://localhost:6000/search?q=' + s)
     .map((res:Response) => res.json().rooms);
}

Edit

If you want to receive the full object from the observable, I see two ways to do that:

  • Explicit subscribe:

    this._searchService.DoGeneralSearch(search).subscribe(
  (data) => {
    this.searchSvc = data;
  }
);

    and in the template

    <div class="typeaheadRowRooms" *ngFor="#item of searchSvc?.rooms">

  • Custom pipe to get the rooms data:

    @Pipe({name: 'field'})
export class FieldPipe implements PipeTransform {
  transform(value, args:string[]) : any {
    return value[args[0]];
  }
}

    and in the template

    <div class="typeaheadRowRooms" *ngFor="#item of searchSvc | async | field:rooms">

Upvotes: 1

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