ab-react

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Examples

• Using SSR and CSR with Next.js
• Plain CSR with Vite.js

---

Installation

yarn add ab-react

or

npm install -S ab-react

Usage

This is mainly for AB testing, it will work with multiple children but try to stick with two.

Normal use case

In the following example, three things can happen:

1 - The ABReact component will randomize one of the children and store the value on a cookie, after that the user will always see the same version.

2 - If a version is set on the cookie with the defined cookie name, that version will be rendered.

3 - If a version is set on the cookie with the defined cookie name but the child doesn't exist null will be returned.

No matter what scenario happens, the trackVersion event will be called each time the component is rendered.

import * as React from 'react';
import { useCallback } from 'react';
import ABReact from 'ab-react';

export default function MyComponent() {
  const trackVersion = useCallback((version: number) => {
    gtag('event', 'screen_view', {
      'screen_name': 'MyComponent',
      'version': version,
    });
  });

  return (
    <ABReact cookieName='cookie-name-to-store-version' event={trackVersion}>
      <div key="version-1">Version 1</div>
      <div key="version-2">Version 2</div>
    </ABReact>
  ) 
}

If you are already using react-cookies and CookiesProvider

If you already has a top-level CookiesProvider mounted you can set a property so the ABReact won't mount the CookiesProvider internally:

import * as React from 'react';
import { useCallback } from 'react';
import ABReact from 'ab-react';

export default function MyComponent() {
  return (
    <ABReact cookieName='cookie-name' mountCookieProvider={false}>
      <div key="version-1">Version 1</div>
      <div key="version-2">Version 2</div>
    </ABReact>
  ) 
}

Forcing a version

If you want to force a version to be rendered (to disable one or to maintain SSR consistency), you can set the property forceVersion:

import * as React from 'react';
import { useCallback } from 'react';
import ABReact from 'ab-react';

export default function MyComponent() {
  return (
    <ABReact cookieName='cookie-name' forceVersion={1}>
      <div key="version-1">Version 1</div>
      <div key="version-2">Version 2</div> {/* This version will always be rendered */}
    </ABReact>
  ) 
}

Examples

Vite.js

Using only CSR (Client Side Rendering)

import { useState, useCallback } from 'react';
import ABReact from 'ab-react';

export default function ABTesting() {
  const [selectedState, setSelectedState] = useState<string>('');

  const eventExample = useCallback((version: number) => {
    setSelectedState(version.toString());

    /**
     * Do any tracking here such as sending an event to Google Analytics
     */
  }, [setSelectedState]);

  return (
    <div>
      <h1>Normal scenario for a pure client side rendering (CSR)</h1>
      <ABReact cookieName='cookie-1' event={eventExample}>
        <div>1</div>
        <div>2</div>
      </ABReact>
      <p>Selected version for cookie-1 (returned by the callback): { selectedState }</p>
    </div>
  );
}

Next.js

Using SSR (Server Side Rendering), CSR (Client Side Rendering) and AppRouter

page.tsx:

/* file: page.tsx */

import { cookies } from 'next/headers';

import Components from './components';

export default function ABTestings() {
  const v1 = Number(cookies().get('cookie-1')?.value);
  const v2 = Number(cookies().get('cookie-2')?.value);

  console.log(cookies().get('cookie-1'));

  return (
    <div>
      <Components v1={Number.isNaN(v1) ? undefined : v1} v2={Number.isNaN(v2) ? undefined : v2} />
    </div>
  );
}

components.tsx:

/* file: components.tsx */
'use client';
import { useState, useCallback } from 'react';
import ABReact from 'ab-react';

export default function Components({ v1, v2 }: { v1?: number, v2?: number }) {
  const [selectedState, setSelectedState] = useState<string>('');

  const eventExample = useCallback((version: number) => {
    setSelectedState(version.toString());

    /**
     * Do any tracking here such as sending an event to Google Analytics
     */
  }, [setSelectedState]);

  return (
    <div>
      <h1>Normal scenario, after SSR forces version from v1</h1>
      <ABReact cookieName='cookie-1' forceVersion={v1}>
        <div>1</div>
        <div>2</div>
      </ABReact>

      <h1>Another scenario, after SSR forces version from v2 and runs an callback when the version is rendered</h1>
      <ABReact cookieName='cookie-2' event={eventExample} forceVersion={v2}>
        <div>1</div>
        <div>2</div>
      </ABReact>
      <p>Selected version for cookie-2 (returned by the callback): { selectedState }</p>

      <h1>Forced version scenario, no internal choosing. Version hard coded.</h1>
      <ABReact cookieName='cookie-3' forceVersion={1}>
        <div>1</div>
        <div>2 forced</div>
      </ABReact>
    </div>
  );
}