README.md

use-scroll-into-view

Better scrollIntoView functionality for React

Install

npm install --save use-scroll-into-view

Usage

use-scroll-into-view handles scroll behavior for any scrollable element. Basic usage works the same way as element.scrollIntoView(). Hook adjusts scrolling animation with respect to the reduced-motion user preference.

API

Hook is configured with settings object:

• onScrollFinish – function that will be called after scroll animation
• easing – custom math EasingFunction function
• duration - duration of scroll animation in milliseconds
• axis - axis of scroll
• cancelable - indicator if animation may be interrupted by user scrolling
• offset - additional distance between nearest edge and element
• isList - indicator that prevents content jumping in scrolling lists with multiple targets eg. Select, Carousel

Hook returns an object with:

• scrollIntoView – function that starts scroll animation
• cancel – function that stops scroll animation
• targetRef - ref of target HTML node
• scrollableRef - ref of scrollable parent HTML element, if not used document element will be used

Returned scrollIntoView function accepts single optional argument alignment - optional target element alignment relatively to parent based on current axis.

scrollIntoView({ alignment: 'center' })

Easing

You can choose easing behavior by selecting value from Easing enum exported together with hook.

If you are not satisfied with that the hook accept custom easing math function to control the flow of animation. It takes t argument which is a number between 0 and 1.

Default EasingFunction is easeInOutQuad - more info here. You can find other popular examples on easings.net

useScrollIntoView({
  target: someDomElement,
  easing: (t) => (t < 0.5 ? 16 * Math.pow(t, 5) : 1 - Math.pow(-2 * x + 2, 5) / 2) // easeInOutQuint
})

Definition

function useScrollIntoView<
  Target extends HTMLElement,
  Parent extends HTMLElement | null = null
>({
  onScrollFinish?: () => void;
  duration?: number;
  axis?: 'x' | 'y';
  easing?: (t: number) => number | Easing;
  offset?: number;
  cancelable?: boolean;
  isList?: boolean;
}): {
  targetRef: MutableRefObject<Target>;
  scrollableRef: MutableRefObject<Parent>;
  scrollIntoView: ({
    alignment?: 'start' | 'end' | 'center';
  }) => void;
  cancel: () => void;
};

License

MIT © EmilMalanczak

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This hook is created using create-react-hook