Search bar with filter and JSON data with Ionic 2

Question

I am very new to Typescript and Ionic 2, and I am trying to filter through json response using the Ionic 2 search bar.

This is my code:

import {Component} from '@angular/core';
import {NavController} from 'ionic-angular';
import {Http} from '@angular/http';
import 'rxjs/add/operator/map';



@Component({
  templateUrl: 'build/pages/home/home.html'
})
export class HomePage {

  posts: any;
  private searchQuery: string = '';
  private items: string[];
  constructor(private http: Http) {

    this.initializeItems();

    this.http.get('https://domain.co/open.jsonp').map(res => res.json()).subscribe(data => {
        this.posts = data;
        console.log(this.posts);

    });

  }

  initializeItems() {
    this.items = this.posts;
  }

  getItems(ev: any) {
    // Reset items back to all of the items
    this.initializeItems();

    // set val to the value of the searchbar
    let val = ev.target.value;

    // if the value is an empty string don't filter the items
    if (val && val.trim() != '') {
      this.items = this.items.filter((item) => {
        return (item.toLowerCase().indexOf(val.toLowerCase()) > -1);
      })
    }
  }

}

And the markup:

<ion-header>
  <ion-searchbar (ionInput)="getItems($event)" [debounce]="500" placeholder="Suchen..."></ion-searchbar>
</ion-header>

<ion-content>
  <ion-list>
    <ion-item *ngFor="let post of posts">
      <h1>{{post.storeName}}</h1>
    </ion-item>
  </ion-list>
</ion-content>

I have this error while searching:

item.toLowerCase is not a function

JSON data is as follows:

[
{
storeName: "Avec Hauptbahnhof",
addressLink: "",
phone: "0326223902",
image: "",
description: "",
link: "",
openingHours: [
"05.30 - 22:00",
"05.30 - 22:00",
"05.30 - 22:00",
"05.30 - 22:00",
"05.30 - 22:00",
"06.30 - 22:00",
"7.00 - 22.00"
]
},
{
storeName: "Manor",
addressLink: "",
phone: "0326258699",
image: "",
customer: "",
description: "",
link: "",
openingHours: [
"09.00 - 18.30",
"09.00 - 18.30",
"09.00 - 18.30",
"09.00 - 21:00",
"09.00 - 18.30",
"08.00 - 17.00",
"Geschlossen"
]
}
]

Answer 1

You get this error because each element is not a string, but an object, so instead of executing

item.toLowerCase().indexOf(val.toLowerCase()) > -1

You have to do

item.storeName.toLowerCase().indexOf(val.toLowerCase()) > -1

Also note that your view uses an array of messages

*ngFor="let post of posts" 

But instead, you should use the items array, because the one to be filtered

  <ion-list>
    <ion-item *ngFor="let item of items">
      <h1>{{item.storeName}}</h1>
    </ion-item>
  </ion-list>

---

, , , , ( http ). , http. Ionic2-beta.11, :

import { Component } from '@angular/core';
import { NavController, LoadingController } from 'ionic-angular';
import { Http } from '@angular/http';
import 'rxjs/add/operator/map';


@Component({
  templateUrl: 'build/pages/home/home.html'
})
export class HomePage {

  private posts: any; // <- I've added the private keyword 
  private searchQuery: string = '';
  private items: any; // <- items property is now of the same type as posts
  constructor(private http: Http, private loadingCtrl: LoadingController) {

    // this.initializeItems(); <- you don't need this anymore

    // Show the loading message
    let loadingPopup = this.loadingCtrl.create({
      content: 'Loading posts...'
    });

    this.http.get('https://domain.co/open.jsonp').map(res => res.json()).subscribe(data => {
        this.posts = data;
        this.initializeItems();

        // Hide the loading message
        loadingPopup.dismiss();
    });
  }

  initializeItems() {
    this.items = this.posts;
  }

  getItems(ev: any) {
    // Reset items back to all of the items
    this.initializeItems();

    // set val to the value of the searchbar
    let val = ev.target.value;

    // if the value is an empty string don't filter the items
    if (val && val.trim() != '') {
      this.items = this.items.filter((item) => {
        return (item.storeName.toLowerCase().indexOf(val.toLowerCase()) > -1);
      })
    }
  }

}

Answer 2

, , angular 2 .

* ngFor.

, , "event.target.value". , .

,

   getAllProdcuts(isFrom, searchText){
      this.toDoService.getAllProdcuts().then((res) => {
        this.items = res;
            if(isFrom == 'search') {
                this.items = this.items.filter((item) => {
                    return (item.toLowerCase().indexOf(searchText.toLowerCase()) > -1);
                })
            }
        }, (err) => {

        });
    }

  getItems(ev: any) {

    // set val to the value of the searchbar
    let val = ev.target.value;

    // if the value is an empty string don't filter the items
    if (val && val.trim() != '') {
        this.getAllProdcuts("search", val);
    }
  }

.

.