Angular 12/11 Autocomplete using Material Example

Angular 11/12 autocomplete using angular material example; In this tutorial, you will learn how to implement autocomplete search using angular material in the angular 11/12 app.

The <mat-autocomplete>, an Angular Directive, is used as a special input control with an inbuilt dropdown to show all possible matches to a custom query. This control acts as a real-time suggestion box as soon as the user types in the input area.

This tutorial will guide you step by step on how to build autocomplete search using external APIs with angular material in angular 11/12 app.

Angular 12/11 Autocomplete Search with Material Tutorial Example

• Step 1 – Create New Angular App
• Step 2 – Add Code on Module.ts File
• Step 3 – Add Code on View File
• Step 4 – Add Code On Component ts File
• Step 5 – Create Services
• Step 6 – Start Angular App

Step 1 – Create New Angular App

First of all, open your terminal and execute the following command on it to install angular app:

ng new my-new-app

Then execute the following command on terminal to install angular material:

ng add @angular/material

Step 2 – Add Code on Module.ts File

In this step, visit src/app directory and open app.module.ts file. Then add the following code into it:

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
      
import { AppComponent } from './app.component';
import {FormsModule, ReactiveFormsModule} from '@angular/forms';
  
import { BrowserAnimationsModule } from '@angular/platform-browser/animations';
import { MatFormFieldModule } from '@angular/material/form-field';
import { MatInputModule } from '@angular/material/input';
  
import {MatAutocompleteModule} from '@angular/material/autocomplete';
  
import { HttpClientModule } from '@angular/common/http';
  
@NgModule({
  declarations: [
    AppComponent
  ],
  imports:      [
    BrowserModule, 
    BrowserAnimationsModule,
    MatFormFieldModule,
    MatInputModule,
    MatAutocompleteModule,
    FormsModule,
    ReactiveFormsModule,
    HttpClientModule
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

Step 3 – Add Code on View File

In this step, create simple reactive form for get input values of autocomplete search. So, visit src/app/app.component.html and update the following code into it:

<h1>Angular 11 material input autocomplete with API example - Tutsmake.Com</h1>
  
<form class="example-form">
    <mat-form-field>
       <input 
               type="text" 
               placeholder="Enter Location" 
               [formControl]="myControl"
               matInput
               [matAutocomplete]="auto">
        <mat-autocomplete #auto="matAutocomplete">
            <mat-option 
                *ngFor="let option of filteredOptions | async" 
                [value]="option.name">
              {{option.name}}
           </mat-option>
       </mat-autocomplete>
    </mat-form-field>
</form>

Step 4 – Add Code On Component ts File

In this step, visit the src/app directory and open app.component.ts. Then add the following code into component.ts file:

import { Component } from '@angular/core';
import {Observable} from 'rxjs';
import { startWith, debounceTime, distinctUntilChanged, switchMap, map } from 'rxjs/operators';
import {FormControl} from '@angular/forms';
import { PostService } from './post.service';
  
@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
  
export class AppComponent {
  
  myControl = new FormControl();
  options = [];
  filteredOptions: Observable;

  
  constructor(private service: PostService) {
     this.filteredOptions = this.myControl.valueChanges.pipe(
      startWith(''),
      debounceTime(400),
      distinctUntilChanged(),
      switchMap(val => {
            return this.filter(val || '')
       }) 
    )
   }
  
  filter(val: string): Observable {

    return this.service.getData()
     .pipe(
       map(response => response.filter(option => { 
         return option.name.toLowerCase().indexOf(val.toLowerCase()) === 0
       }))
     )
   }  
}

Step 5 – Create Service

In this step, visit the src/app/ directory and open or create post.service.ts. Then add the following code into post.service.ts file:

import { Injectable } from '@angular/core';

import { HttpClient } from '@angular/common/http';

import { tap, map } from 'rxjs/operators';

import { of } from 'rxjs';

  

@Injectable({

  providedIn: 'root'

})

export class PostService {

  

  constructor(private http: HttpClient) { }

  

    opts = [];

  

    getData() {

  

          return this.opts.length ?

            of(this.opts) :

            this.http.get('https://jsonplaceholder.typicode.com/users').pipe(tap(data => this.opts = data))

   

    }

}

Step 5 – Start Angular App

In this step, execute the following commands on terminal to start angular app:

ng serve

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