Replace Subdomain Name With Other Subdomain Using Javascript?

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?

Solution 1:

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')

Solution 2:

This should work in normal cases:

"http://news.domain.com/path/..".replace(/(:\/\/\w+\.)/, "://mobile.")

Use following to add an extra level of validation:

functionreplaceSubdomain(url, toSubdomain) {
    const replace = "://" + toSubdomain + ".";

    // Prepend http://if (!/^\w*:\/\//.test(url)) {
        url = "http://" + url;
    }

    // Check if we got a subdomain in urlif (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"));

Solution 3:

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:

functionreplaceSubdomain(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'));

Solution 4:

If you want to send user to new url via JS - use document.location = "mobile.domain.com/path/..".

Solution 5:

You cannot replace a subdomain. You can redirect using javascript.

<scripttype="text/javascript"><!--
window.location = "http://mobile.domain.com/path/to/file.html"
//--></script>