How to call function after URLSearchParam?

问题

I need redirect page after it load and get param from URL. I can do by button click. But how I can make page redirect automatic after page have get param from URL (without user input)?

Thanks!

const handleClick = async (event) => {
  const stripe = await stripePromise;
  const { error } = await stripe.redirectToCheckout({
    param,
  });
}

const param = new URLSearchParams(window.location.search).get('param');


const Page = () => {
  React.useEffect(() => {
    window.scrollTo(0, 0);
  }, []);
  return (
    <section >

      <button role="link" onClick={handleClick}>
      Press
    </button>

    </section>
  );
};

export default Page;

回答1:

You could probably just use your useEffect hook there to redirect the page, instead of using the onClick handler. e.g.

const handleLoad = async () => {
  const stripe = await stripePromise;
  const { error } = await stripe.redirectToCheckout({
    param,
  });
}

const param = new URLSearchParams(window.location.search).get('param');


const Page = () => {
  React.useEffect(() => {
    handleLoad();
  }, []);
  return null;
};

export default Page;

Though, you don't really even need to load up React for any of this. You could just make this page a static html page with a script tag that does the redirect logic, or something similar to that.

---

After further discussion, we found out that in order for this stripe stuff to work on Safari-mobile, we needed to wait for the page's load event before calling handleLoad(), so something like this:

const handleLoad = async () => {
  const stripe = await stripePromise;
  const { error } = await stripe.redirectToCheckout({
    param,
  });
}

const param = new URLSearchParams(window.location.search).get('param');
window.addEventListener('load', () => handleLoad())

回答2:

You're going to want to parse those query parameters in the init/load handler. You can see an example of this here. Note that the event listener on DOMContentLoaded kicks everything off. An example of this in action can be seen here.

I noticed that your code uses param in the Checkout redirect directly. If param is a checkout session that you should be generating these on demand, not sending them in emailed links etc, as they are short-lived. In the example above, the code param is read and use to generate a new checkout session via a fetch and then that is used for the redirect.

来源：https://stackoverflow.com/questions/62971083/how-to-call-function-after-urlsearchparam