I have the following URL:
http://www.abebooks.com/servlet/BookDetailsPL?bi=1325819827&searchurl=an%3DLofting%252C%2BHugh.%26ds%3D30%26sortby%3D13%26tn%3DDOCTOR%2BDOLITTLE%2527S%2BGARDEN.
Where bi is a identifier for the specific book.
How can I extract the book id from the link?
Thanks!
You can to use this regex:
var address = "http://www.abebooks.com/servlet/BookDetailsPL?bi=1325819827&...";
var bi = /[\?&]bi=(\d+)/.exec(address)[1]
alert(bi)
bi is not the first param in the url; i.e., it may not always be prefixed with ? but might also be prefixed with &function getBookId()
{
var query = document.location.split("?")[1];
var values = query.split("&");
for(var i = 0; i < values.length; i++)
{
a = values[i].split("=");
if(a[0] === "bi")
return a[1];
}
//some error occurred
return null;
}
You can extract the book id (assumed to be only numbers) via a regular expression (and grouping).
var s = "http://www.abebooks.com/servlet/BookDetailsPL?\
bi=1325819827&searchurl=an%3DLofting%252C%2BHugh.\
%26ds%3D30%26sortby%3D13%26tn%3DDOCTOR%2BDOLITTLE\
%2527S%2BGARDEN."
var re = /bi=([0-9]+)&/; // or equally: /bi=(\d+)&/
var match = re.exec(s);
match[1]; // => contains 1325819827
bi is the last parameter, it won't be followed by an &. Safe bet, I guess, would be /\bbi=(\d+)\b/ - \b matches a word boundary. But I am not sure if something-bi=1235&bi=456 is a valid query string - that's why I went with js.address.split("bi=")[1].split("&")[0]
xyzbi= or otherbi= which would not be the intended effect...Try this
var bookId
var matcher = location.search.match(/(?:[?&]bi=([^&]+))/); // Assuming window.location
if (null !== matcher) {
bookId = matcher[1];
}
I once had the same problem.
I created a little function to help me out. Don't know where it is but I managed to recreate it:
function get(item,url) {
if (url == undefined)
url = window.location.href;
var itemlen = item.length
var items = url.split('?')[1].split('&');
for (var i = 0, len = items.length;i<len;i++) {
if (items[i].substr(0,itemlen) == item)
return items[i].split('=')[1];
}
return null;
}
So you would use it like:
get('bi');
If the url you gave was your current url, if not you could do:
get('bi','http://www.abebooks.com/servlet/BookDetailsPL?bi=1325819827&searchurl=an%3DLofting%252C%2BHugh.%26ds%3D30%26sortby%3D13%26tn%3DDOCTOR%2BDOLITTLE%2527S%2BGARDEN.')
Hope I didn't leave in any bugs :)
