How to preserve query parameters in react-router v4

Question

Users redirected to my app after login (server on java), and they have url, which looks like this http://10.8.0.29:8083/html/?locale=RU&token=1c5c71f2-dcda-4a51-8cf6-f8

Answer 1

I already shared my solution for react-router v3 in the comment to your question.

Below is my solution for react-router v4.

Use the following createPreserveQueryHistory function to override history.push and history.replace methods so they will preserve specified query parameters:

import queryString from 'query-string';
import {createBrowserHistory} from 'history'

function preserveQueryParameters(history, preserve, location) {
    const currentQuery = queryString.parse(history.location.search);
    if (currentQuery) {
        const preservedQuery = {};
        for (let p of preserve) {
            const v = currentQuery[p];
            if (v) {
                preservedQuery[p] = v;
            }
        }
        if (location.search) {
            Object.assign(preservedQuery, queryString.parse(location.search));
        }
        location.search = queryString.stringify(preservedQuery);
    }
    return location;
}

function createLocationDescriptorObject(location, state) {
    return typeof location === 'string' ? { pathname: location, state } : location;
}

function createPreserveQueryHistory(createHistory, queryParameters) {
    return (options) => {
        const history = createHistory(options);
        const oldPush = history.push, oldReplace = history.replace;
        history.push = (path, state) => oldPush.apply(history, [preserveQueryParameters(history, queryParameters, createLocationDescriptorObject(path, state))]);
        history.replace = (path, state) => oldReplace.apply(history, [preserveQueryParameters(history, queryParameters, createLocationDescriptorObject(path, state))]);
        return history;
    };
}

const history = createPreserveQueryHistory(createBrowserHistory, ['locale', 'token', 'returnTo'])();

Then use it in your router definition:

<Router history={history}>
    ...
</Router>

For those who use TypeScript:

import {History, LocationDescriptor, LocationDescriptorObject} from 'history'
import queryString from 'query-string'
import LocationState = History.LocationState

type CreateHistory<O, H> = (options?: O) => History & H

function preserveQueryParameters(history: History, preserve: string[], location: LocationDescriptorObject): LocationDescriptorObject {
    const currentQuery = queryString.parse(history.location.search)
    if (currentQuery) {
        const preservedQuery: { [key: string]: unknown } = {}
        for (let p of preserve) {
            const v = currentQuery[p]
            if (v) {
                preservedQuery[p] = v
            }
        }
        if (location.search) {
            Object.assign(preservedQuery, queryString.parse(location.search))
        }
        location.search = queryString.stringify(preservedQuery)
    }
    return location
}

function createLocationDescriptorObject(location: LocationDescriptor, state?: LocationState): LocationDescriptorObject {
    return typeof location === 'string' ? {pathname: location, state} : location
}

export function createPreserveQueryHistory<O, H>(createHistory: CreateHistory<O, H>,
                                                 queryParameters: string[]): CreateHistory<O, H> {
    return (options?: O) => {
        const history = createHistory(options)
        const oldPush = history.push, oldReplace = history.replace
        history.push = (path: LocationDescriptor, state?: LocationState) =>
            oldPush.apply(history, [preserveQueryParameters(history, queryParameters, createLocationDescriptorObject(path, state))])
        history.replace = (path: LocationDescriptor, state?: LocationState) =>
            oldReplace.apply(history, [preserveQueryParameters(history, queryParameters, createLocationDescriptorObject(path, state))])
        return history
    }
}

Answer 2

In React-Router 4.3 (not sure about earlier versions), if you have a <Route> just above, something like this should work: (this is in Typescript)

Route({ path: ..., render: (props) => function() {
  Redirect({ ...,
      to: { pathname: ... search: props.location.search, ... }})
});

Explanation: You use the render: (props) => .... proprety of the <Route> tag, instead of component: ..., because render gives you props, so then inside the <Redirect> you can use props.location.search and in that way access the current query params, and reuse in the redirect.

If there's no <Route> above, maybe you cannot. I just asked here: How preserve query string and hash fragment, in React-Router 4 <Switch><Redirect>?

Answer 3

I switched off the hash router in this project, which preserves all parameters in route.