Filtering search results on Angular2 and Ionic2

Question

Filtering search results on Angular2 and Ionic2

I am seeking to incorporate search features using ionic2 and angular2. In a previous version, I utilized This Filter Example, however, it is no longer functional in the newer version.

What is the best approach for implementing search functionality with angular2 + ionic2?

angular typescript ionic-framework ionic2 ionic3

Answer 1

Answer №1

If you're looking to implement a search feature in your Ionic 2 application, the Searchbar component is the way to go. For a demonstration, check out this working plunker.

Using the Searchbar component is straightforward. Start by ensuring that your Component has a list of items to display in the view.

import { Component } from "@angular/core";
import { NavController } from 'ionic-angular/index';

@Component({
     templateUrl:"home.html"
})
export class HomePage {

  constructor() {
    this.initializeItems();
  }

  initializeItems() {
    this.items = [
      'Amsterdam',
      'Bogota',
      'Buenos Aires',
      'Dhaka'
    ];
  }

  getItems(ev) {
    // 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);
      })
    }
  }
}

As shown in the code snippet above, the filtering functionality happens within these lines:

// 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);
  })
}

To complete the implementation, add the following code snippet to your view:

<ion-header>
  <ion-navbar primary>
    <ion-title>
      Ionic 2
    </ion-title>
  </ion-navbar>
</ion-header>
<ion-content>
  <ion-searchbar (ionInput)="getItems($event)"></ion-searchbar>
  <ion-list>
    <ion-item *ngFor="let item of items">
      {{ item }}
    </ion-item>
  </ion-list>

</ion-content>

Note how we bind the ionInput event from the ion-searchbar element to the getItems method like so:

(ionInput)="getItems($event)

Answer 2

If you're looking to implement a search feature in your Ionic 2 application, the Searchbar component is the way to go. For a demonstration, check out this working plunker.

Using the Searchbar component is straightforward. Start by ensuring that your Component has a list of items to display in the view.

import { Component } from "@angular/core";
import { NavController } from 'ionic-angular/index';

@Component({
     templateUrl:"home.html"
})
export class HomePage {

  constructor() {
    this.initializeItems();
  }

  initializeItems() {
    this.items = [
      'Amsterdam',
      'Bogota',
      'Buenos Aires',
      'Dhaka'
    ];
  }

  getItems(ev) {
    // 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);
      })
    }
  }
}

As shown in the code snippet above, the filtering functionality happens within these lines:

// 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);
  })
}

To complete the implementation, add the following code snippet to your view:

<ion-header>
  <ion-navbar primary>
    <ion-title>
      Ionic 2
    </ion-title>
  </ion-navbar>
</ion-header>
<ion-content>
  <ion-searchbar (ionInput)="getItems($event)"></ion-searchbar>
  <ion-list>
    <ion-item *ngFor="let item of items">
      {{ item }}
    </ion-item>
  </ion-list>

</ion-content>

Note how we bind the ionInput event from the ion-searchbar element to the getItems method like so:

(ionInput)="getItems($event)

Filtering search results on Angular2 and Ionic2

Answer №1

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