Method ngDoCheck

src/material/input/input.ts:386–411

()

  }

  ngDoCheck() {
    if (this.ngControl) {
      // We need to re-evaluate this on every change detection cycle, because there are some
      // error triggers that we can't subscribe to (e.g. parent form submissions). This means
      // that whatever logic is in here has to be super lean or we risk destroying the performance.
      this.updateErrorState();

      // Since the input isn't a `ControlValueAccessor`, we don't have a good way of knowing when
      // the disabled state has changed. We can't use the `ngControl.statusChanges`, because it
      // won't fire if the input is disabled with `emitEvents = false`, despite the input becoming
      // disabled.
      if (this.ngControl.disabled !== null && this.ngControl.disabled !== this.disabled) {
        this.disabled = this.ngControl.disabled;
        this.stateChanges.next();
      }
    }

    // We need to dirty-check the native element's value, because there are some cases where
    // we won't be notified when it changes (e.g. the consumer isn't using forms or they're
    // updating the value using `emitEvent: false`).
    this._dirtyCheckNativeValue();

    // We need to dirty-check and set the placeholder attribute ourselves, because whether it's
    // present or not depends on a query which is prone to "changed after checked" errors.
    this._dirtyCheckPlaceholder();
  }

  /** Focuses the input. */
  focus(options?: FocusOptions): void {