Input inside Select Angular-CodePudding

I need your help. I have a small piece of code in which I have a select i option. With their help, I iterate through the elements and select the one I need. The point is that I need to do a search inside this select. That is, I can both select an item from the list and start typing, looking for the item I need and the items are shown to me. Please help to do this? Thank you very much

<mat-select formControlName="targetListValue">
   <input>
   <mat-option [selected]="true" [value]="null"></mat-option>
   <mat-option *ngFor="let targetItem of targetListOptions" [value]="targetItem.id">
      {{ targetItem.name }}
   </mat-option>
</mat-select>

CodePudding user response：

You can use the idea of 'autocomplete' control.

angular material provides an autoComplete component that contains a select with input:

The autocomplete is a normal text input enhanced by a panel of suggested options.

HTML CODE:

<form >
  <mat-form-field  appearance="fill">
    <mat-label>Number</mat-label>
    <input type="text"
           placeholder="Pick one"
           aria-label="Number"
           matInput
           [formControl]="myControl"
           [matAutocomplete]="auto">
    <mat-autocomplete autoActiveFirstOption #auto="matAutocomplete">
      <mat-option *ngFor="let option of filteredOptions | async" [value]="option">
        {{option}}
      </mat-option>
    </mat-autocomplete>
  </mat-form-field>
</form>

TS CODE:

import {Component, OnInit} from '@angular/core';
import {FormControl} from '@angular/forms';
import {Observable} from 'rxjs';
import {map, startWith} from 'rxjs/operators';

/**
 * @title Highlight the first autocomplete option
 */
@Component({
  selector: 'autocomplete-auto-active-first-option-example',
  templateUrl: 'autocomplete-auto-active-first-option-example.html',
  styleUrls: ['autocomplete-auto-active-first-option-example.css'],
})
export class AutocompleteAutoActiveFirstOptionExample implements OnInit {
  myControl = new FormControl('');
  options: string[] = ['One', 'Two', 'Three'];
  filteredOptions: Observable<string[]>;

  ngOnInit() {
    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));
  }
}

CSS:

.example-form {
  min-width: 150px;
  max-width: 500px;
  width: 100%;
}

.example-full-width {
  width: 100%;
}