Filter in Angular Auto complete component

27 Apr 20244 minutes to read

The AutoComplete data can be filtered based on both text and value fields using predicate of dataManager through filtering event. The filtered data can be again updated through updateData method.

In the following example, filtering is done based on text and value fields.

app.component.ts

import { NgModule } from '@angular/core'
import { BrowserModule } from '@angular/platform-browser'
import { FormsModule } from '@angular/forms'
import { AutoCompleteModule } from '@syncfusion/ej2-angular-dropdowns'




import { Component } from '@angular/core';
import { Query, DataManager,Predicate } from '@syncfusion/ej2-data';

@Component({
imports: [
        FormsModule, AutoCompleteModule
    ],


standalone: true,
    selector: 'app-root',
    // specifies the template string for the AutoComplete component
    template: `<ejs-autocomplete id='ddlelement' #samples [dataSource]='searchData' [fields]='fields' [placeholder]='text' [itemTemplate]="itemTemplate" [query]='query'(filtering)="onFiltering($event)"></ejs-autocomplete> `
})

export class AppComponent {
query: any;
    constructor() {
    }
    // defined the array of data
    public searchData: { [key: string]: Object }[] = [
    { Name: 'Australia', Code: 'AU' },
    { Name: 'Bermuda', Code: 'BM' },
    { Name: 'Canada', Code: 'CA' },
    { Name: 'Cameroon', Code: 'CM' },
    { Name: 'Denmark', Code: 'DK' },
    { Name: 'France', Code: 'FR' },
    { Name: 'Finland', Code: 'FI' },
    { Name: 'Germany', Code: 'DE' },
    { Name: 'Greenland', Code: 'GL' },
    { Name: 'Hong Kong', Code: 'HK' },
    { Name: 'India', Code: 'IN' },
    { Name: 'Italy', Code: 'IT' },
    { Name: 'Japan', Code: 'JP' },
    { Name: 'Mexico', Code: 'MX' },
    { Name: 'Norway', Code: 'NO' },
    { Name: 'Poland', Code: 'PL' },
    { Name: 'Switzerland', Code: 'CH' },
    { Name: 'United Kingdom', Code: 'GB' },
    { Name: 'United States', Code: 'US' }];
    // maps the appropriate column to fields property
    public fields: Object = { value: "Code" , text:"Name"};
    // set the placeholder to the AutoComplete input
    public text: string = "Find a country";
    public itemTemplate:string= "<span><span class='name'>${Name}</span>-<span class ='code'>${Code}</span></span>";
    public onFiltering (e : any)
    {
      e.preventDefaultAction=true;
           var predicate = new Predicate('Name', 'contains', e.text);
               predicate = predicate.or('Code', 'contains', e.text);
            var query = new Query();
        //frame the query based on search string with filter type.
          query = (e.text != "") ? query.where(predicate) : query;
        //pass the filter data source, filter query to updateData method.
          e.updateData(this.searchData, query);
    }
}

main.ts

import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));