如何使用选项组重置材料自动完成中的自定义过滤器

问题描述 投票:0回答:1

如何在物料自动填充autocomplete中重置自定义过滤器值。我选择了像here这样的选项组。现在我想创建一个自定义过滤器来过滤我们的结果和它的选项组名称。就像在我的ts文件中我有:

pokemonGroups = [
    {
      name: 'Grass',
      pokemon: [
        'bulbasaur-0', 'Bulbasaur', 'oddish-1','Oddish','bellsprout-2', 'Bellsprout'
      ]
    },
    {
      name: 'Water',
      pokemon: [
        'squirtle-3', 'Squirtle', 'psyduck-4','Psyduck', 'horsea-5', 'Horsea'
      ]
    }]

现在在我的HTML中:

<form [formGroup]="searchForm">
  <mat-form-field class="example-full-width">
    <input type="text" placeholder="Pokemon" aria-label="Pokemon" matInput formControlName="pokemonControl" [matAutocomplete]="auto">
    <mat-autocomplete #auto="matAutocomplete">
      <mat-optgroup *ngFor="let group of pokemonGroups" [label]="group.name" [disabled]="group.disabled">
        <mat-option *ngFor="let poke of group.pokemon" [value]="poke">
          {{ poke }}
        </mat-option>
      </mat-optgroup>
    </mat-autocomplete>
  </mat-form-field>
</form>

我的打字稿文件:

ngOnInit() {
// ... code
this.searchForm.controls.pokemonControl.valueChanges
      .subscribe(
      (val) => {
        this.filter(val);
      }
      );
}
filter(val) {
    for (const pokemon of this.pokemonGroups) {
      pokemon.pokemon= pokemon.pokemon.filter(pok=>
        pok.toLowerCase().indexOf(val.toLowerCase()) === 0);
    }

    return this.pokemonGroups;
  }

过滤器工作正常,但当我按退格键或删除关键字时,它应该重置我的所有值。哪个不行。

angular autocomplete angular-material2 angular5
1个回答
0
投票

我没有测试但是你可以尝试这样。另请检查this

ngOnInit() {

this.pokemonControl.valueChanges
      .subscribe(
      (val) => {
        this.filter(val);
      }
      );
}
  filter(val) {

    for (const pokemon of this.pokemonGroups) {
      pokemon.pokemon= pokemon.pokemon.filter(pokemon=>
        pokemon.toLowerCase().indexOf(val.toLowerCase()) === 0);
    }
    return this.pokemonGroup;
  }
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