How to get previous URL in Next.js? - next.js

Question

How can I get the previous URL in Next.js?
I thought the values this.props.router.asPath and nextProps.router.asPath are different.
Actually, I want to call router.push after login. I know that router.back goes to the previous page. But it's possible to go to another site. The users having history stacks go to the previous page, the users not having history stacks go to / main page.
import { Component } from 'react'
import App, { Container } from 'next/app';
import ErrorComponent from '#/components/error'
export default class MyApp extends App {
render() {
console.log(this.props)
const { Component, pageProps, router } = this.props;
const props = {
...pageProps,
router
}
return (
<ErrorBoundary>
<Container>
<Component {...props} />
</Container>
</ErrorBoundary>
);
}
componentWillReceiveProps(nextProps) {
// previous page url /contents
console.log(this.props.router.asPath) // /about
console.log(nextProps.router.asPath) // /about
console.log('window.history.previous.href', window.history.previous) // undefined
}
}
How can I fix it? Or how can I get the previous URL to move page after login?

Answer 1

You find the Referer ( so the previous URL ) in the context of getServerSideProps or any other Data fetching methods
as
context.req.headers.referer
example in code
export async function getServerSideProps(context) {
console.log(context.req.headers.referer)
}

Answer 2

I've used Context do to this
In _app.tsx
import { HistoryProvider } from '../contexts/History'
const MyApp: React.FC<AppProps> = ({ Component, pageProps }) => {
return (
<ThemeProvider theme={theme}>
<Header />
<HistoryProvider>
<Component {...pageProps} />
</HistoryProvider>...
/contexts/History.tsx
import { useRouter } from 'next/router'
import React, { createContext, useState, useEffect, useContext } from 'react'
interface HValidation {
history: string[]
setHistory(data: string[]): void
back(): void
}
const HistoryContext = createContext<HValidation>({} as HValidation)
export const HistoryProvider: React.FC = ({ children }) => {
const { asPath, push, pathname } = useRouter()
const [history, setHistory] = useState<string[]>([])
function back() {
for (let i = history.length - 2; i >= 0; i--) {
const route = history[i]
if (!route.includes('#') && route !== pathname) {
push(route)
// if you want to pop history on back
const newHistory = history.slice(0, i)
setHistory(newHistory)
break
}
}
}
useEffect(() => {
setHistory(previous => [...previous, asPath])
}, [asPath])
return (
<HistoryContext.Provider
value={{
back,
history,
setHistory,
}}
>
{children}
</HistoryContext.Provider>
)
}
export function useHistory(): HValidation {
const context = useContext(HistoryContext)
return context
}
In any component, you can use
import { useHistory } from '../../contexts/History'
const ContentHeader: React.FC<ContentHeaderProps> = ({ title, hideBack }) => {
const { history, back } = useHistory() ...
I've used this component to back history ignoring links with hash (#), because the native router.back() was bugging when i have <a href="#someid" /> to scroll page to some page ids
I wanted to go back to last page, and not the last anchor
EDIT 01/04/2021
You can also set a fallback route for "back".
back(fallbackRoute?: string): void
function back(fallbackRoute?: string) {
for (let i = history.length - 2; i >= 0; i--) {
const route = history[i]
console.log({ route, pathname })
if (!route.includes('#') && route !== pathname) {
push(route)
const newHistory = history.slice(0, i)
setHistory(newHistory)
return
}
}
if (fallbackRoute) {
router.push(fallbackRoute)
}
}

Answer 3

I think you can implement a custom history in global state
Something like this
_app.js
import React from 'react';
import App, { Container } from 'next/app';
class MyApp extends App {
static async getInitialProps({ Component, ctx }) {
let pageProps = {};
if (Component.getInitialProps) {
pageProps = await Component.getInitialProps(ctx);
}
return { pageProps };
}
state = {
history: [] // keep history items in state
};
componentDidMount() {
const { asPath } = this.props.router;
// lets add initial route to `history`
this.setState(prevState => ({ history: [...prevState.history, asPath] }));
}
componentDidUpdate() {
const { history } = this.state;
const { asPath } = this.props.router;
// if current route (`asPath`) does not equal
// the latest item in the history,
// it is changed so lets save it
if (history[history.length - 1] !== asPath) {
this.setState(prevState => ({ history: [...prevState.history, asPath] }));
}
}
render() {
const { Component, pageProps } = this.props;
return (
<Container>
<Component history={this.state.history} {...pageProps} />
</Container>
);
}
}
export default MyApp;
so then in your components you can navigate wherever you want within history
if (!history || !history.length) {
router.push('/');
} else {
router.push(history[history.length - 1]);
}
Hope this helps!

Answer 4

I was looking for a very simple way to do this since some of the answers here seem a bit complex for implementing something this simple. router.back() doesn't seem to work well in this scenario as, in my case, it'd go all the way back and out of my site some times.
So, I thought 🤔, what better way to do this than localStorage?
when I need to send the user to the '/login' route, I add the current route to localStorage
if (!auth.user) {
window.localStorage.setItem("path", router.asPath);
router.replace("/login");
return <div> redirecting to login... </div>;
}
and once the user sign-in, I send them back to the previous page (the route of which has been saved in the localStorage
if (auth.user) {
router.replace(localStorage.getItem("path") || "/");
return <div> Loading... </div>
);
}
You can observe the localStorage while testing to see what is going on. I hope this helps someone.

Answer 5

Let's say there's a /profile page which should be rendered iff user is logged in or else user should be redirected to /login, after user login on /login, it should be pushed to previous page (here/profile) but not on another website or New Tab.
In /profile this is how you should redirect to /login
Router.push('/login?referer=profile', '/login')
In /login after user is successfully logged in, use:
Router.push(Router.query.referer?.toString||'/')
Hope this helped.

Answer 6

I recently had this problem and used the following solution to route back to the previous page.
In my component I used the useRouter() hook from Next.js. This hook produces a router object which has the back() function. This function can be used on an <a> tag to redirect back in the following way.
const Component: React.FC = () => {
const router = useRouter();
return (
<>
<a onClick={() => router.back()}>Go back to the last page</a>
</>
);
};
Note that this function does not produce a URL that you can use as a value in the href, which is unfortunate. But I think this solution is simple yet effective.
Reference: https://nextjs.org/docs/api-reference/next/router#routerback

Answer 7

Simple Hook
Add this hook, and call it in your _app.tsx or where needed. You can compare it to router.pathname if you need to know what the change was.
const usePreviousRoute = () => {
const { asPath } = useRouter();
const ref = useRef<string | null>(null);
useEffect(() => {
ref.current = asPath;
}, [asPath]);
return ref.current;
};
This doesn't leave data behind once the page is closed (storage, cookies) and cleanly resets to null on next visit to the site.

Answer 8

import { useState, useEffect } from "react";
import { useRouter } from "next/router";
// in _app.js
function MyApp({ Component, pageProps }) {
const router = useRouter();
const [history, setHistory] = useState({ previous: null, current: router.asPath });
useEffect(() => {
setHistory((oldHistory) => ({ ...oldHistory, previous: oldHistory.current, current: router.asPath }));
}, [router.asPath]);
return (<Component {...{ ...pageProps, history }} />);
}
export default MyApp;
// in a page
function MyPage({ ...pageProps }) {
return (<span>Previous route: {pageProps.history?.previous || "/"}</span>);
}
export default MyPage;

Answer 9

I tried doing similar to iurii's answer. My _app.js looks like this (I was trying to integrate with segment.com so felt this need)
export default class MyApp extends App {
componentDidMount () {
const { asPath } = this.props.router;
this.setState(prevState => ({ history: [...prevState.history, asPath] }));
const isBrowser = typeof window !== 'undefined';
if(isBrowser) {
// For the first page load
console.log("Going to log first load --> referrer : ", document.referrer);
// this can get me the document.referrer properly, if I come to the website from a third party source like google search.
global.analytics.page(window.location.href,
{referrer: document.referrer}
)
}
}
static async getInitialProps ({ Component, router, ctx }) {
let pageProps = {}
if (Component.getInitialProps) {
pageProps = await Component.getInitialProps(ctx)
}
return { pageProps }
}
state = {
history: [] // keep history items in state
};
componentDidUpdate() {
const { history } = this.state;
const { asPath } = this.props.router;
// if current route (`asPath`) does not equal
// the latest item in the history,
// it is changed so lets save it
if (history[history.length - 1] !== asPath) {
global.analytics.page(window.location.href, {
referrer: history[history.length - 1] ? history[history.length - 1] : ""
})
// this simulates the document.referrer on pages after the user navigates
this.setState(prevState => ({ history: [...prevState.history, asPath] }));
}
}
So with a combination of history[history.length - 1] ? history[history.length - 1] : "" and const isBrowser = typeof window !== 'undefined'; I am able to simulate document.referrer for all cases. But I am missing one case, suppose , I am at google, my site landing page is A, then A points to B
Then google to A --> I get document.referrer as google
Then A to B --> I get document.referrer as A which is consistent with the behavior.
But Now If I refresh page B, then my document.referrer becomes google again.
I think I can save the last known previous URL in local storage , but that will be a anti-pattern as the browser back button can correctly take the user to the previous page (A), so somewhere the data is there already. Currently I can live with this solution as I only use this for analytics purpose on segment.com and google analytics, so refreshing will mess up my analytics numbers slightly, but still looking forward to a perfect solution so get exact data.

Answer 10

I can not get previous URL but with the code below I can find have a back URL or no:
typeof window !== 'undefined' && +window?.history?.state?.idx > 0
const back = async () => {
if (typeof window !== 'undefined' && +window?.history?.state?.idx > 0) {
await Router.back()
} else {
await Router.replace(fallbackURL)
}
}

Answer 11

A more simple way is
import { useRouter } from 'next/router';
const router = useRouter();
router.back()