Refresh a page every 30 seconds

June 20, 2018

Refreshing a page on a interval is sometimes very useful. This will work on most pages, but if it doesn’t, you will need a browser extension in order to auto refresh that page.

Bookmarklet

Drag the following link to your bookmark bar!

Refresh 30s

Don’t click the button twice, or the site breaks. Nested iframes are probably not allowed by browsers.

Or add this code to a bookmark:

javascript:(a=>{a(),setInterval(a,3e4)})((b=document)=>{b.write(`<iframe src="${location}" style="position:absolute;top:0;left:0;width:100%;height:100%;border:0"/>`),b.close()});

How it works:

It creates an iframe on the same page and reloads it every 30 seconds

let refresh = () => {
  document.write(`<iframe src="${location}" style="position:absolute;top:0;left:0;width:100%;height:100%;border:0"/>`)
  document.close()
}
refresh()
setInterval(refresh, 30000)

Codegolfed

let r = (d = document) => {
  d.write(`<iframe src="${location}" style="position:absolute;top:0;left:0;width:100%;height:100%;border:0"/>`)
  d.close()
}
x()
setInterval(x, 3e4)

Golfed + Minified

After minification it’s only 167B. Please let me know if you can do it in less without modifying global scope!

(a=>{a(),setInterval(a,3e4)})((b=document)=>{b.write(`<iframe src="${location}" style="position:absolute;top:0;left:0;width:100%;height:100%;border:0"/>`),b.close()});