how to make javascript scrollIntoView smooth?

问题:

In a react app, I have a method being called to bring a particular node into view as follows.

scrollToQuestionNode(id) {
        const element = document.getElementById(id);
        element.scrollIntoView(false);
}

The scroll happens fine, but the scroll action is a little jerky. How can I make it smooth? I don't see any options which I can give to scrollIntoView for the same.

回答1:

This might help.

From MDN documentation of scrollIntoView You can pass in option instead of boolean.

scrollIntoViewOptions Optional
A Boolean or an object with the following options:
{
  behavior: "auto"  | "instant" | "smooth",
  block:    "start" | "center" | "end" | "nearest",
  inline:    "start" | "center" | "end" | "nearest",
}

So you can simply pass parameter like this.

scrollToQuestionNode(id) {
  const element = document.getElementById(id);
  element.scrollIntoView({ block: 'end',  behavior: 'smooth' });
}

Reference: https://developer.mozilla.org/en/docs/Web/API/Element/scrollIntoView

回答2:

For multibrowser support use the smooth-scroll-polyfill from here

For easy implementation use a wrapper like this around the polyfill so the .js polyfill method would be inizialized after loading:

https://codepen.io/diyifang/embed/MmQyoQ?height=265&theme-id=0&default-tab=js,result&embed-version=2

Now this should work cross browser:

document.querySelector('.foo').scrollIntoView({
  behavior: 'smooth'
});