How to get base url with jquery or javascript?

In joomla php there I can use $this->baseurl to get the base path, but I wanted to get the base path in jquery.

The base path may be any of the following example:

http://www.example.com/
http://localhost/example
http://www.example.com/sub/example

The example may also change.

This one will help you...

var getUrl = window.location;
var baseUrl = getUrl .protocol + "//" + getUrl.host + "/" + getUrl.pathname.split('/')[1];

I think this will work well for you:

var base_url = window.location.origin;

var host = window.location.host;

var pathArray = window.location.pathname.split( '/' );

This will get base url

var baseurl = window.location.origin+window.location.pathname;

document.baseURI returns base URL also respecting the value in <base/> tag https://developer.mozilla.org/en-US/docs/Web/API/Node/baseURI

This is an extremely old question, but here are the approaches I personally use ...

Get Standard/Base URL

As many have already stated, this works for most situations.

var url = window.location.origin;

Get Absolute Base URL

However, this simple approach can be used to strip off any port numbers.

var url = "http://" + location.host.split(":")[0];

Edit: To address the concern, posed by Jason Rice, the following can be used to automatically insert the correct protocol type ...

var url = window.location.protocol + "//" + location.host.split(":")[0];

Set Base URL

As a bonus -- the base URL can then be redefined globally.

document.head.innerHTML = document.head.innerHTML + "<base href='" + url + "' />";

the easiest way to get base url in JavaScript

window.location.origin

This is not possible from javascript, because this is a server-side property. Javascript on the client cannot know where joomla is installed. The best option is to somehow include the value of $this->baseurl into the page javascript and then use this value (phpBaseUrl).

You can then build the url like this:

var loc = window.location;
var baseUrl = loc.protocol + "//" + loc.hostname + (loc.port? ":"+loc.port : "") + "/" + phpBaseUrl;

var getUrl = window.location;
var baseurl = getUrl.origin; //or
var baseurl =  getUrl.origin + '/' +getUrl.pathname.split('/')[1]; 

But you can't say that the baseurl() of CodeIgniter(or php joomla) will return the same value, as it is possible to change the baseurl in the .htaccess file of these frameworks.

For example :

If you have an .htaccess file like this in your localhost :

RewriteEngine on
RewriteBase /CodeIgniter/
RewriteCond $1 !^(index.php|resources|robots.txt)
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php/$1 [L,QSA]

The $this->baseurl() will return http://localhost/CodeIgniter/

Had the same issue a while ago, my problem was, I simply needed the base url. There are a lot of detailed options here but to get around this, simply use the window.location object. Actually type this in the browser console and hit enter to select your options there. Well for my case it was simply:

window.location.origin

I've run into this need on several Joomla project. The simplest way I've found to address is to add a hidden input field to my template:

<input type="hidden" id="baseurl" name="baseurl" value="<?php echo $this->baseurl; ?>" />

When I need the value in JavaScript:

var baseurl = document.getElementById('baseurl').value;

Not as fancy as using pure JavaScript but simple and gets the job done.

You can easily get it with:

var currentUrl = window.location.href;

or, if you want the original URL, use:

var originalUrl = window.location.origin;

I am surprised that non of the answers consider the base url if it was set in <base> tag. All current answers try to get the host name or server name or first part of address. This is the complete logic which also considers the <base> tag (which may refer to another domain or protocol):

function getBaseURL(){
  var elem=document.getElementsByTagName("base")[0];
  if (typeof(elem) != 'undefined' && elem != null){
     return elem.href;
  }
  return window.location.origin;
}

Jquery format:

function getBaseURL(){
  if ($("base").length){
     return $("base").attr("href");
  }
  return window.location.origin;
}

Without getting involved with the logic above, the shorthand solution which considers both <base> tag and window.location.origin:

Js:

var a=document.createElement("a");
a.href=".";
var baseURL= a.href;

Jquery:

var baseURL= $('<a href=".">')[0].href

Final note: for a local file in your computer (not on a host) the window.location.origin only returns the file:// but the sorthand solution above returns the complete correct path.

I would recommend for everyone to create HTML base tag in development, then assign the href dynamically, so in production whatever host a client uses, it will automacically addapt to it:

<html>
 <title>Some page title</titile>
  <script type="text/javascript">
    var head  = document.getElementsByTagName('head')[0];
    var base = document.createElement("base");
    base.href = window.document.location.origin;
    head.appendChild(base);
  </script>
 </head>
 ...

So if you are in localhot:8080, you will reach every linked or referenced file from the base, eg: http://localhost:8080/some/path/file.html If you are in www.example.com, it will be http://www.example.com/some/path/file.html

Also note that, every location you're on, you should not use references like globs in hrefs, eg: Parent location causes http://localhost:8080/ not http://localhost:8080/some/path/.

Pretent you reference all hyperlinks as full sentenced without the bas url.

The format is hostname/pathname/search

So the url is :

var url = window.location.hostname + window.location.pathname + window.location.hash

For your case

window.location.hostname = "stackoverflow.com"
window.location.pathname ="/questions/25203124/how-to-get-base-url-with-jquery-or-javascript"
window.location.hash = ""

So basically the baseurl = hostname = window.location.hostname

Here's a short one:

const base = new URL('/', location.href).href;

console.log(base);

window.location.origin+"/"+window.location.pathname.split('/')[1]+"/"+page+"/"+page+"_list.jsp"

almost same as Jenish answer but a little shorter.

I was just on the same stage and this solution works for me

In the view

<?php
    $document = JFactory::getDocument();

    $document->addScriptDeclaration('var base = \''.JURI::base().'\'');
    $document->addScript('components/com_name/js/filter.js');
?>

In js file you access base as a variable for example in your scenario:

console.log(base) // will print
// http://www.example.com/
// http://localhost/example
// http://www.example.com/sub/example

I do not remember where I take this information to give credit, if I find it I will edit the answer

Easy

$('<img src=>')[0].src

Generates a img with empty src-name forces the browser to calculate the base-url by itself, no matter if you have /index.html or anything else.

Here's something quick that also works with file:// URLs.

I came up with this one-liner:

[((1!=location.href.split(location.href.split("/").pop())[0].length?location.href.split(location.href.split("/").pop())[0]:(location.protocol,location.protocol+"//" + location.host+"/"))).replace(location.protocol+"//"+location.protocol+"//"+location.protocol+"://")]

var getUrl = window.location;
var baseUrl = getUrl .protocol + "//" + getUrl.host + "/" + getUrl.pathname.split('/')[1];

You mentioned that the example.com may change so I suspect that actually you need the base url just to be able to use relative path notation for your scripts. In this particular case there is no need to use scripting - instead add the base tag to your header:

<head>
  <base href="http://www.example.com/">
</head>

I usually generate the link via PHP.

In case anyone would like to see this broken out into a very robust function

    function getBaseURL() {
        var loc = window.location;
        var baseURL = loc.protocol + "//" + loc.hostname;
        if (typeof loc.port !== "undefined" && loc.port !== "") baseURL += ":" + loc.port;
        // strip leading /
        var pathname = loc.pathname;
        if (pathname.length > 0 && pathname.substr(0,1) === "/") pathname = pathname.substr(1, pathname.length - 1);
        var pathParts = pathname.split("/");
        if (pathParts.length > 0) {
            for (var i = 0; i < pathParts.length; i++) {
                if (pathParts[i] !== "") baseURL += "/" + pathParts[i];
            }
        }
        return baseURL;
    }

A simpler answer is here, window.location.href = window.location.origin;

Split and join the URL:

const s = 'http://free-proxy.cz/en/abc'
console.log(s.split('/').slice(0,3).join('/'))

Getting the base url |Calls controller from js

function getURL() {

var windowurl = window.location.href;
var baseUrl = windowurl.split('://')[1].split('/')[0]; //split function

var xhr = new XMLHttpRequest();
var url='http://'+baseUrl+'/url from controller';
xhr.open("GET", url);
xhr.send(); //object use to send

xhr.onreadystatechange=function() {
	if(xhr.readyState==4 && this.status==200){
 //console.log(xhr.responseText); //the response of the request
		
 document.getElementById("id from where you called the function").innerHTML = xhr.responseText;
}
  }
}

Put this in your header, so it will be available whenever you need it.

var base_url = "<?php echo base_url();?>";

You will get http://localhost:81/your-path-file or http://localhost/your-path-file.