I'm trying to replace the subdomain name from "news.domain.com/path/.." to "mobile.domain.com/path/..", using JavaScript
Any idea how to achieve this?
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1As others have implied, can you be a bit more clear about what want to achieve: do you want to redirect the user's browser to the new URL, or do you just want to know how to transform the first string into the second?FixMaker– FixMaker2013-04-18 14:14:32 +00:00Commented Apr 18, 2013 at 14:14
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i want to replace the subdomain name news instead mobile in the url, so it shows the mobile version of the page.Bala– Bala2013-04-18 14:21:25 +00:00Commented Apr 18, 2013 at 14:21
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6 Answers
I'm assuming that you want to change a string in the generic format xxxx.domain.com/... into mobile.domain.com/.... This regexp should do it in JavaScript:
var oldPath = "news.domain.com/path/";
var newPath = oldPath.replace(/^[^.]*/, 'mobile')
3 Comments
Bala
how do i get the current path(old path), because the url is dynamic
Bala
i tried this var oldPath = window.location.href; var newPath = oldPath.replace(/^[^.]*/, 'mobile'); document.location = newPath; but no luck.
FixMaker
@Bala,
window.location.href will give you a fully qualified URL (e.g. http://news.domain.com/path). You'll need to take into account the http:// prefix when running the above code.This should work in normal cases:
"http://news.domain.com/path/..".replace(/(:\/\/\w+\.)/, "://mobile.")
Use following to add an extra level of validation:
function replaceSubdomain(url, toSubdomain) {
const replace = "://" + toSubdomain + ".";
// Prepend http://
if (!/^\w*:\/\//.test(url)) {
url = "http://" + url;
}
// Check if we got a subdomain in url
if (url.match(/\.\w*\b/g).length > 1) {
return url.replace(/(:\/\/\w+\.)/, replace)
}
return url.replace(/:\/\/(\w*\.)/, `${replace}$1`)
}
console.log(replaceSubdomain("example.com", "mobile"));
console.log(replaceSubdomain("http://example.com:4000", "mobile"));
console.log(replaceSubdomain("www.example.com:4000", "mobile"));
console.log(replaceSubdomain("https://www.example.com", "mobile"));
console.log(replaceSubdomain("sub.example.com", "mobile"));
2 Comments
M Abdul Sami
Its not considering special characters in subdomain like underscore or dash
nyghtly
Regex to handle subdomains that include special characters:
/:\/\/([\w_-]*\.)/If you want to send user to new url via JS - use document.location = "mobile.domain.com/path/..".
Comments
In reference to FixMaker's comment on his answer:
window.location.href will give you a fully qualified URL (e.g. http://news.domain.com/path). You'll need to take into account the http:// prefix when running the above code
A suitable regular expression to handle the request scheme (http/https) is as follows:
function replaceSubdomain(url, subdomain){
return url.replace(/^(https?:\/\/)(www\.)?([^.])*/, `$1$2${subdomain}`);
}
let url1 = 'https://sub-bar.main.com';
let url2 = 'https://www.sub-bar.main.com';
console.log(replaceSubdomain(url1, 'foobar'));
console.log(replaceSubdomain(url2, 'foobar'));
Comments
You cannot replace a subdomain. You can redirect using javascript.
<script type="text/javascript">
<!--
window.location = "http://mobile.domain.com/path/to/file.html"
//-->
</script>
1 Comment
Bala
I know to redirect the domain, i want to change the word news to mobile in url
I tried using java script but no luck and for my case i use the below code in .httaccess file
RewriteCond %{HTTP_USER_AGENT} "iphone|ipod|android" [NC]
RewriteCond %{HTTP_HOST} !^mobile.domain.com
RewriteRule ^(.*)$ http://mobile.domain.com/ [L,R=302]
it will replace "news" sub domain to "mobile" sub domain. hope it will help any one.
