How to use angular material 6 autocomplete with data server

How to use angular material 6 autocomplete with data server

To use Angular Material 6 autocomplete with data from a server, you need to follow these steps:

  1. Install Angular Material: If you haven't already installed Angular Material, you can add it to your project using the Angular CLI.

    ng add @angular/material

  2. Import Angular Material Modules: Import the necessary Angular Material modules in your app.module.ts file.

    import { BrowserAnimationsModule } from '@angular/platform-browser/animations'; import { MatInputModule } from '@angular/material/input'; import { MatAutocompleteModule } from '@angular/material/autocomplete'; import { HttpClientModule } from '@angular/common/http'; import { ReactiveFormsModule } from '@angular/forms'; @NgModule({ declarations: [ // your components ], imports: [ BrowserAnimationsModule, MatInputModule, MatAutocompleteModule, HttpClientModule, ReactiveFormsModule, // other modules ], providers: [], bootstrap: [AppComponent] }) export class AppModule { }

  3. Create a Service to Fetch Data: Create a service to fetch data from the server using Angular's HttpClient.

    import { Injectable } from '@angular/core'; import { HttpClient } from '@angular/common/http'; import { Observable } from 'rxjs'; @Injectable({ providedIn: 'root' }) export class DataService { constructor(private http: HttpClient) { } getData(query: string): Observable<any[]> { // Replace with your actual API endpoint const url = `https://your-api-endpoint?query=${query}`; return this.http.get<any[]>(url); } }

  4. Create the Component: Create a component that uses the autocomplete feature.

    import { Component, OnInit } from '@angular/core'; import { FormControl } from '@angular/forms'; import { Observable } from 'rxjs'; import { debounceTime, switchMap, map } from 'rxjs/operators'; import { DataService } from './data.service'; @Component({ selector: 'app-autocomplete', templateUrl: './autocomplete.component.html', styleUrls: ['./autocomplete.component.css'] }) export class AutocompleteComponent implements OnInit { myControl = new FormControl(); options: Observable<any[]>; constructor(private dataService: DataService) { } ngOnInit() { this.options = this.myControl.valueChanges.pipe( debounceTime(300), switchMap(value => this.dataService.getData(value)) ); } }

  5. Create the Template: Create the HTML template for the component.

    <!-- autocomplete.component.html --> <mat-form-field> <input type="text" matInput [formControl]="myControl" [matAutocomplete]="auto"> <mat-autocomplete #auto="matAutocomplete"> <mat-option *ngFor="let option of options | async" [value]="option"> {{ option }} </mat-option> </mat-autocomplete> </mat-form-field>

  6. Style the Component: Optionally, add some CSS to style your component.

    /* autocomplete.component.css */ mat-form-field { width: 100%; }

Explanation

  • HttpClient: Angular's HttpClient service is used to make HTTP requests to fetch data from the server.
  • Reactive Forms: Using Angular's ReactiveFormsModule to create a form control (myControl) for the input field.
  • RxJS Operators: Using RxJS operators like debounceTime to wait for a specified time between input changes, switchMap to switch to a new observable on each input change, and map to transform the data.
  • Material Autocomplete: Using Angular Material's mat-autocomplete directive to create the autocomplete dropdown.

By following these steps, you can integrate Angular Material's autocomplete component with data fetched from a server, providing a responsive and dynamic user experience.

Examples

  1. "Angular Material 6 autocomplete with server data using HTTPClient"

    Description: Fetch data from a server using Angular's HTTPClient and display it in an Angular Material autocomplete component.

    Code:

    // app.module.ts import { HttpClientModule } from '@angular/common/http'; import { NgModule } from '@angular/core'; import { BrowserModule } from '@angular/platform-browser'; import { BrowserAnimationsModule } from '@angular/platform-browser/animations'; import { MatAutocompleteModule } from '@angular/material/autocomplete'; import { MatInputModule } from '@angular/material/input'; import { ReactiveFormsModule } from '@angular/forms'; import { AppComponent } from './app.component'; @NgModule({ declarations: [AppComponent], imports: [ BrowserModule, BrowserAnimationsModule, HttpClientModule, MatAutocompleteModule, MatInputModule, ReactiveFormsModule, ], providers: [], bootstrap: [AppComponent], }) export class AppModule {} 
    // app.component.ts import { Component, OnInit } from '@angular/core'; import { FormControl } from '@angular/forms'; import { HttpClient } from '@angular/common/http'; import { Observable } from 'rxjs'; import { map, startWith } from 'rxjs/operators'; @Component({ selector: 'app-root', templateUrl: './app.component.html', styleUrls: ['./app.component.css'] }) export class AppComponent implements OnInit { myControl = new FormControl(); options: string[] = []; filteredOptions: Observable<string[]>; constructor(private http: HttpClient) {} ngOnInit() { this.http.get<string[]>('https://api.example.com/data').subscribe(data => { this.options = data; }); this.filteredOptions = this.myControl.valueChanges.pipe( startWith(''), map(value => this._filter(value)) ); } private _filter(value: string): string[] { const filterValue = value.toLowerCase(); return this.options.filter(option => option.toLowerCase().includes(filterValue)); } } 
    <!-- app.component.html --> <mat-form-field> <input type="text" matInput [formControl]="myControl" [matAutocomplete]="auto"> <mat-autocomplete #auto="matAutocomplete"> <mat-option *ngFor="let option of filteredOptions | async" [value]="option"> {{ option }} </mat-option> </mat-autocomplete> </mat-form-field>

  2. "Angular Material 6 autocomplete with async server data"

    Description: Use an asynchronous data source to fetch options for the Angular Material autocomplete.

    Code:

    // app.component.ts import { Component, OnInit } from '@angular/core'; import { FormControl } from '@angular/forms'; import { HttpClient } from '@angular/common/http'; import { Observable } from 'rxjs'; import { debounceTime, distinctUntilChanged, switchMap } from 'rxjs/operators'; @Component({ selector: 'app-root', templateUrl: './app.component.html', styleUrls: ['./app.component.css'] }) export class AppComponent implements OnInit { myControl = new FormControl(); filteredOptions: Observable<string[]>; constructor(private http: HttpClient) {} ngOnInit() { this.filteredOptions = this.myControl.valueChanges.pipe( debounceTime(300), distinctUntilChanged(), switchMap(value => this._filter(value)) ); } private _filter(value: string): Observable<string[]> { return this.http.get<string[]>(`https://api.example.com/data?search=${value}`); } } 
    <!-- app.component.html --> <mat-form-field> <input type="text" matInput [formControl]="myControl" [matAutocomplete]="auto"> <mat-autocomplete #auto="matAutocomplete"> <mat-option *ngFor="let option of filteredOptions | async" [value]="option"> {{ option }} </mat-option> </mat-autocomplete> </mat-form-field>

  3. "Using Angular Material autocomplete with HTTPClient and RxJS"

    Description: Integrate Angular Material autocomplete with HTTPClient and RxJS to handle server-side data fetching.

    Code:

    // app.component.ts import { Component, OnInit } from '@angular/core'; import { FormControl } from '@angular/forms'; import { HttpClient } from '@angular/common/http'; import { Observable } from 'rxjs'; import { map, startWith, switchMap } from 'rxjs/operators'; @Component({ selector: 'app-root', templateUrl: './app.component.html', styleUrls: ['./app.component.css'] }) export class AppComponent implements OnInit { myControl = new FormControl(); options: Observable<string[]>; constructor(private http: HttpClient) {} ngOnInit() { this.options = this.myControl.valueChanges.pipe( startWith(''), switchMap(value => this._filter(value)) ); } private _filter(value: string): Observable<string[]> { const filterValue = value.toLowerCase(); return this.http.get<string[]>('https://api.example.com/data').pipe( map(response => response.filter(option => option.toLowerCase().includes(filterValue))) ); } } 
    <!-- app.component.html --> <mat-form-field> <input type="text" matInput [formControl]="myControl" [matAutocomplete]="auto"> <mat-autocomplete #auto="matAutocomplete"> <mat-option *ngFor="let option of options | async" [value]="option"> {{ option }} </mat-option> </mat-autocomplete> </mat-form-field>

  4. "Debouncing server requests with Angular Material autocomplete"

    Description: Implement debouncing to limit the number of server requests when typing in an Angular Material autocomplete field.

    Code:

    // app.component.ts import { Component, OnInit } from '@angular/core'; import { FormControl } from '@angular/forms'; import { HttpClient } from '@angular/common/http'; import { Observable } from 'rxjs'; import { debounceTime, distinctUntilChanged, switchMap } from 'rxjs/operators'; @Component({ selector: 'app-root', templateUrl: './app.component.html', styleUrls: ['./app.component.css'] }) export class AppComponent implements OnInit { myControl = new FormControl(); options: Observable<string[]>; constructor(private http: HttpClient) {} ngOnInit() { this.options = this.myControl.valueChanges.pipe( debounceTime(300), distinctUntilChanged(), switchMap(value => this._filter(value)) ); } private _filter(value: string): Observable<string[]> { return this.http.get<string[]>(`https://api.example.com/data?search=${value}`); } } 
    <!-- app.component.html --> <mat-form-field> <input type="text" matInput [formControl]="myControl" [matAutocomplete]="auto"> <mat-autocomplete #auto="matAutocomplete"> <mat-option *ngFor="let option of options | async" [value]="option"> {{ option }} </mat-option> </mat-autocomplete> </mat-form-field>

  5. "Angular Material 6 autocomplete with dynamic server-side filtering"

    Description: Use dynamic server-side filtering to fetch autocomplete options as the user types.

    Code:

    // app.component.ts import { Component, OnInit } from '@angular/core'; import { FormControl } from '@angular/forms'; import { HttpClient } from '@angular/common/http'; import { Observable } from 'rxjs'; import { debounceTime, distinctUntilChanged, switchMap } from 'rxjs/operators'; @Component({ selector: 'app-root', templateUrl: './app.component.html', styleUrls: ['./app.component.css'] }) export class AppComponent implements OnInit { myControl = new FormControl(); options: Observable<string[]>; constructor(private http: HttpClient) {} ngOnInit() { this.options = this.myControl.valueChanges.pipe( debounceTime(300), distinctUntilChanged(), switchMap(value => this._filter(value)) ); } private _filter(value: string): Observable<string[]> { return this.http.get<string[]>(`https://api.example.com/data?filter=${value}`); } } 
    <!-- app.component.html --> <mat-form-field> <input type="text" matInput [formControl]="myControl" [matAutocomplete]="auto"> <mat-autocomplete #auto="matAutocomplete"> <mat-option *ngFor="let option of options | async" [value]="option"> {{ option }} </mat-option> </mat-autocomplete> </mat-form-field>

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