How to get the directory part of current URL in JavaScript?

Question

I\'m trying to add a \"back to dir\" button at the top of a web page, which would redirect the user to the same URL, but with no filename in it.

For example, clickin

Answer 1

Try the following, which takes into account both when the URL ends in a trailing slash and when it doesn't:

var currUrl = document.URL,
    newUrl;
if (currUrl.charAt(currUrl.length - 1) === '/') {
    newUrl = currUrl.slice(0, currUrl.lastIndexOf('/'));
    newUrl = newUrl.slice(0, newUrl.lastIndexOf('/')) + '/';
} else {
    newUrl = currUrl.slice(0, currUrl.lastIndexOf('/')) + '/';
}
console.log(newUrl);