获取带有或不带有URL斜杠的目录？

Question

Here's my current code:

var loc = window.location.pathname;
var str = loc.substring(0, loc.lastIndexOf('/'));
var subid = str.replace("/", "");

When I go to http://example.com/12345/ , then subid equals 12345 .

But when I go to http://example.com/12345 , then subid is blank.

How can I make this work with or without the trailing slash?

Answer 1

If you consider regex,

var loc = window.location.pathname;
var subid = loc.match(/^http[s]?:\/\/.*?\/([a-zA-Z-_]+).*$/)[1];

Test with different cases

var url1 = "http://google.com/abc-1";
var url2 = "http://google.com/abc-2/";
var subid1 = url1.match(/^http[s]?:\/\/.*?\/([a-zA-Z-_]+).*$/)[1];
var subid2 = url2.match(/^http[s]?:\/\/.*?\/([a-zA-Z-_]+).*$/)[1];
console.log(subid1);
console.log(subid2);

Answer 2

Try this one.

    var loc="http://example.com/12340/";
    if((loc.length-1)==loc.lastIndexOf('/'))
    {

        var newloc=loc.substring(0,loc.length-1);
        var subid=newloc.substring((newloc.lastIndexOf('/')+1),newloc.length);
    }
    else
    {
        var subid=loc.substring((loc.lastIndexOf('/')+1),loc.length);
    }
    console.log("sub is "+subid);

Answer 3

So much overkill and code that doesn't work in older browsers in other answers. It's as simple as this:

var subid = location.pathname.match(/^\/([^\/]*)/)[1];

You can assign the result of match to another variable and add more groupings to the regex if you need to capture other segments, too.

Answer 4

if you want to extract last part of string then you can use

loc.substring(loc.lastIndexOf('/')).replace('/','');

in case of last '/ first check with .endsWith('/') method and then remove last '/' using

if(loc.endsWith('/')) {
   loc.substring( -1, loc.lastIndexOf('/')).replace('/','');
}

alternative way is

 loc.split('/').filter( path => !path).pop();

Answer 5

You can take a benefit of inbuilt function URL

(new URL('http://example.com/12345/')).pathname.replace(/\//g,'') // output 12345
(new URL('http://example.com/12345')).pathname.replace(/\//g,'') // output 12345

The one who are looking for the last segment only can use this function

var allPartsOfURL = 'http://example.com/12345/12/98/567'.split('/');
// handle potential trailing slash
var lastSegment = allPartsOfURL.pop() || allPartsOfURL.pop();  


console.log(lastSegment);

For old browsers

// create an anchor tag 
const url = document.createElement('a');
// set the href attribute and then use the `pathname`
url.setAttribute('href', 'http://example.com/12345/');
url.pathname.replace(/\//g,''); // output 12345

url.setAttribute('href', 'http://example.com/12345');
url.pathname.replace(/\//g,''); // output 12345