balaji balaji - 3 months ago 469
TypeScript Question

How to do auto-complete in ionic 2 (search-bar)

I am trying to do an auto complete in my search bar what i have done so far is.

I have an array with some strings. and then i am trying to list in my items it i am able to search the particualr item.

But my requirement is not to display the items in a list. I have to make on clicking the search bar all the strings in array should come and the i have to make a search.

<ion-header>

<ion-navbar>
<ion-title>search</ion-title>
</ion-navbar>
<ion-toolbar primary >
<ion-searchbar (ionInput)="getItems($event)" autocorrect="off"></ion-searchbar>
</ion-toolbar>

</ion-header>


<ion-content padding>

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

</ion-content>


Code for search.ts file:

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

/*
Generated class for the SearchPage page.

See http://ionicframework.com/docs/v2/components/#navigation for more info on
Ionic pages and navigation.
*/
@Component({
templateUrl: 'build/pages/search/search.html',
})
export class SearchPage {
private searchQuery: string = '';
private items: string[];

constructor(private navCtrl: NavController) {
this.initializeItems();
}

initializeItems() {
this.items = [
'Amsterdam',
'Bogota',
]
}

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);
})
}
}
}


Question :


How to get the value of an array through auto complete in ionic 2.

Answer

In order to achieve that, you just need to add a small thing to your code. Please take a look at this plunker.

Like you can see there, with the showList variable we can show the results only after the user has searched something.

  <ion-list *ngIf="showList">
    <ion-item *ngFor="let item of items">
      {{ item }}
    </ion-item>
  </ion-list>

We first set that variable to false in the constructor and then we set it to true inside the getItems(...) method.