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URL with URL parameters gets concatenated in browsers

I have the following code:
const url = 'https://accounts.google.com/o/oauth2/v2/auth?redirect_uri=' +
encodeURIComponent('https://dev.mysite.com/google_oauth2/') +
'&scope=https://www.googleapis.com/auth/drive.file&client_id=myclientid'
window.open(url, "", "width=700,height=500")
And the super-strange behaviour is that if I clear the browser history and run this code for the first time, it works fine, BUT THEN if I run for the second and subsequent times, the urls gets concatenated and I see
https://dev.mysite.com/google_oauth2/?code=mycode&scope=https://www.googleapis.com/auth/drive.file
instead of
https://accounts.google.com/o/oauth2/v2/auth?redirect_uri=https://dev.mysite.com%2Fgoogle_oauth2%&scope=https://www.googleapis.com/auth/drive.file&client_id=myclientid
Does anyone know why this happens ?
BTW, I am using React.JS, but I don't think it has something to do with this...
Resolved. Was a Google-specific issue

I would suggest you use a more appropriate URL and URLSearchParams for such purpose: https://developer.mozilla.org/en-US/docs/Web/API/URLSearchParams
and https://developer.mozilla.org/en-US/docs/Web/API/URL
So your code would be:
const url = new URL('https://accounts.google.com/o/oauth2/v2/auth')
url.searchParams.append('redirect_uri', 'https://dev.mysite.com/google_oauth2/');
url.searchParams.append('scope', 'https://www.googleapis.com/auth/drive.file');
url.searchParams.append('client_id', 'myclientid');
And url.href would be:
https://accounts.google.com/o/oauth2/v2/auth?redirect_uri=https%3A%2F%2Fdev.mysite.com%2Fgoogle_oauth2%2F&scope=https%3A%2F%2Fwww.googleapis.com%2Fauth%2Fdrive.file&client_id=myclientid

How can I make a page that look for URL and create a text that refer to the URL?

So it's kind of a dumb question but I'm really wondering how I can make this :
user type www.mydomaine.com/something
page display : something
and it does with anything he type after the domain name
I've no idea how I could do that. I know I can get an info from an URL with jQuery but how can i remove the thing like index.html in the url? My guess would be with the htaccess?
Also, there won't be any other page but this with some design, how can I make sure someone doesn't go anywhere else but on the page that display what he wrote after the domain name?
I hope that's clear, thanks for reading and your answers !
Pierre

When creating an anchor tag and adding an href (or making a URL) I needed the URL to have a protocol (http or https), so I made a validation to add it, and then you can access the parameters of the URL easier.
Also, if you want to remove the / from the pathname you can use a .replace('/', '') when using parser.pathname
For removing index.html from the URL, you can split the path and get only the first element, or the ones you need f.e. parser.pathname.split('/')[0]
var myUrl = "www.mydomaine.com/something"
if (!myUrl.startsWith('http')) myUrl = 'http://' + myUrl;
var parser = document.createElement('a');
parser.href = myUrl;
console.log(parser.pathname);
// Other option
var theUrl = new URL(myUrl);
console.log(theUrl.pathname);
I used this as a reference.

Why is window.location.href appending url again

In my code, I'm assigning the following:
window.location.href = "www.example.com/test";
But when the page actually loads, the browser URL is www.example.com/test/www.example.com/test. I'm not appending anything to the URL, and I'm not sure how its appending the URL again.

I think you're missing the "http" or "https" part. Have you tried the following?
window.location.href = "https://www.example.com/test";
or
window.location.href = "http://www.example.com/test";

Because you forgot the protocol. If you omit the protocol, window.location.href thinks you are trying to access a folder with the name of www.example.com, relative to the page you are currently on.
window.location.href="http://www.example.com/test/" will ensure that you access the external website www.example.com.
Hope this helps! :)

Check the way you are constructing the url, sometimes we miss the host, or enter the incorrect path
A safe way to change the URl is by making changes in the exisiting URL
first get the existing URL by
let exisitingURl = window.location.href;
now manipulate this url, for eg
exisitingURL = exisitingURL.replace('/auth', '/gateway');
now go to the url by
window.location.href = existingURL;

How to get previous url including hash fragment using JavaScript?

I need to get the previous url to redirect to the previous page. I have url like www.mysite.com/users/register/#1.
I use document.referrer to get the previous url,but it doesn't return hash part(#1). How to get the previous url including hash part?

How to get previous url including hash fragment using JavaScript?
As you've noted, the hash fragment part of that means you can't use document.referrer.
If the previous page was on the same origin: You'd need to have code on that page recording the full URL, for instance in sessionStorage.
On the previous page, perhaps each time hashChange is fired:
sessionStorage.setItem("last-url", location);
On the new page, to get the URL:
var lastUrl = sessionStorage.getItem("last-url");
If the previous page was on a different origin: I'm fairly certain you can't.
I need to get the previous url to redirect to the previous page.
Actually, you don't. You can just use history.go(-1) or history.back() to do that, which work regardless of the origin of the previous page.

try for previous url,
function backtopage() {
window.history.back();
}

May be you can use onhashchange event.
When url is changed,it produces a event with old url and new url.
The oldurl has even the hash part

$(window).bind('statechange',function(){
// Prepare Variables
var State = History.getState(),
url = State.url,
states = History.savedStates,
prevUrlIndex = states.length - 2,
prevUrl = states[prevUrlIndex].hash;
});

Try this one::
In previous page url:
www.mysite.com/users/register/#1
In Current Page:
$(document).ready(function() {
var referrerUrl = document.referrer.replace("#","e");
var correctUrl=referrerUrl.replace("e","#");
});

Remove parameter from url not working

I'm attempting to remove a url parameter status from the url but in the following alert, the parameter is still there.
var addressurl = location.href.replace(separator + "status=([^&]$|[^&]*)/i", "");
alert(addressurl);
location.href= addressurl;
How do i solve?

You are confusing regex with strings.
It should be:
var addressurl = location.href.replace(separator, '').replace(/status=([^&]$|[^&]*)/i", "");

Javascript context in web pages are to the page you are working on.
When you reload, redirect or move to any other page, javascript changes done in previous page will not be there. This has to be handled from server side.

Refresh repeats the last request to the server, which is going to ignore your javascript changes. Instead navigate to the new url with window.location = addressurl;