Find id number in url using javascript

Question

Currently I am scraping the end of an url using javascript like so:

var url = document.URL;
var sale = url.substring(url.lastIndexOf('/') + 1);
if(sale != "")

So if there is this /sales/1234 it would pick it up, trouble is it still works for something else like sales/anotherword/1234, is there an easy way to adjust this to only pick up the number after "/sales/"?

Updated : stackoverflow.com/a/22155056/1636522.

user1636522
– user1636522

2014-03-05 15:51:12 +00:00
Commented Mar 5, 2014 at 15:51 — user1636522
– user1636522, Commented Mar 5, 2014 at 15:51

ekhaled · Accepted Answer · 2014-03-03 18:58:55Z

1

You could try using regular expressions:

var url = document.URL;
var sale = null;

var matches = url.match(/\/sales\/(\d+)/);

if(matches.length && matches[1]){
   sale = matches[1];
}

answered Mar 3, 2014 at 18:58

ekhaled

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kaspermoerch · Accepted Answer · 2014-03-03 18:56:30Z

0

You could do a bit more validating:

Make sure there is no / after the one after sales.
Make sure that the value you get is a number.

Something like this could work:

var url = document.URL;
var sale = url.substring(url.lastIndexOf('/sales/') + 1);
if(sale.indexOf('/') < 0 && !isNaN(sale)) {
    //Handle the sale
}
else {
    //sale either contains a / or is not a number
}

answered Mar 3, 2014 at 18:56

kaspermoerch

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score 0 · Accepted Answer · 2014-03-05 15:49:35Z

0

You could also do this :

var sale = parseInt(url.split('/sales/')[1], 10);
if (!isNaN(sale)) {
    // do something
}

parseInt() returns NaN (Not A Number) in case of failure.

Here is a function :

function toSaleId(url) {
    var id = parseInt(url.split('/sales/')[1], 10);
    if (!isNaN(id)) return id; 
}

Usage examples :

var sale = toSaleId('/sale/1234'); // 1234
var sale = toSaleId('/sale/1234/anotherworld'); // 1234
var sale = toSaleId('/sale/anotherworld/1234'); // undefined

edited Mar 5, 2014 at 15:49

answered Mar 3, 2014 at 19:03

user1636522

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