Method _dirtyCheckPlaceholder

src/material/input/input.ts:467–476

Does some manual dirty checking on the native input `placeholder` attribute.

()

  /** Does some manual dirty checking on the native input `placeholder` attribute. */
  private _dirtyCheckPlaceholder() {
    const placeholder = this._getPlaceholder();
    if (placeholder !== this._previousPlaceholder) {
      const element = this._elementRef.nativeElement;
      this._previousPlaceholder = placeholder;
      placeholder
        ? element.setAttribute('placeholder', placeholder)
        : element.removeAttribute('placeholder');
    }
  }

  /** Gets the current placeholder of the form field. */
  protected _getPlaceholder(): string | null {