Method focus

src/material/chips/chip-grid.ts:325–349

* Focuses the first chip in this chip grid, or the associated input when there * are no eligible chips.

()

   * are no eligible chips.
   */
  override focus(): void {
    if (this.disabled || this._chipInput?.focused) {
      return;
    }

    if (!this._chips.length || this._chips.first.disabled) {
      if (!this._chipInput) {
        return;
      }

      // Delay until the next tick, because this can cause a "changed after checked"
      // error if the input does something on focus (e.g. opens an autocomplete).
      Promise.resolve().then(() => this._chipInput!.focus());
    } else {
      const activeItem = this._keyManager.activeItem;

      if (activeItem) {
        activeItem.focus();
      } else {
        this._keyManager.setFirstItemActive();
      }
    }

    this.stateChanges.next();
  }

  /**
   * Implemented as part of MatFormFieldControl.