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# :cookie: react-cookie-consent :cookie:

A small, simple and customizable cookie consent bar for use in React applications.

[![NPM](https://nodei.co/npm/react-cookie-consent.png)](https://npmjs.org/package/react-cookie-consent)

Demo: https://mastermindzh.github.io/react-cookie-consent/

Example branch: https://github.com/Mastermindzh/react-cookie-consent/tree/example

![Downloads](https://img.shields.io/npm/dm/react-cookie-consent) ![Dependent repos (via libraries.io)](https://img.shields.io/librariesio/dependent-repos/npm/react-cookie-consent) ![GitHub contributors](https://img.shields.io/github/contributors/mastermindzh/react-cookie-consent) ![Minified size](https://img.shields.io/bundlephobia/min/react-cookie-consent) ![npm type definitions](https://img.shields.io/npm/types/react-cookie-consent) ![license-mit](https://img.shields.io/badge/license-MIT-green)

## Default look

![default look](https://raw.githubusercontent.com/Mastermindzh/react-cookie-consent/master/images/default.png)

## Table of contents

<!-- toc -->

- [Installation](#installation)
- [Using it](#using-it)
  - [getting the cookies value in your own code](#getting-the-cookies-value-in-your-own-code)
- [Props](#props)
- [Debugging it](#debugging-it)
- [Why are there two cookies? One of which named "Legacy"](#why-are-there-two-cookies-one-of-which-named-legacy)
- [Styling it](#styling-it)
  - [Examples](#examples)
    - [Changing the bar background to red](#changing-the-bar-background-to-red)
    - [Changing the button font-weight to bold](#changing-the-button-font-weight-to-bold)
    - [Using predefined CSS classes](#using-predefined-css-classes)
    - [Accept on scroll](#accept-on-scroll)
    - [Flipping the buttons](#flipping-the-buttons)
    - [Extra cookie options](#extra-cookie-options)
    - [Rainbows!](#rainbows)
    - [Overlay](#overlay)
- [Contributor information](#contributor-information)
- [Projects using react-cookie-consent](#projects-using-react-cookie-consent)

<!-- tocstop -->

## Installation

```shell
npm install react-cookie-consent
```

or use yarn:

```shell
yarn add react-cookie-consent
```

## Using it

You can import the cookie bar like this:

```js
import CookieConsent from "react-cookie-consent";
```

If you want to set/remove cookies yourself you can optionally import `Cookies` (straight from js-cookie) like this:

```js
import CookieConsent, { Cookies } from "react-cookie-consent";
```

Then you can use the component anywhere in your React app like so:

```jsx
<CookieConsent>This website uses cookies to enhance the user experience.</CookieConsent>
```

You can optionally set some props like this (next chapter will show all props):

```js
<CookieConsent
  location="bottom"
  buttonText="Sure man!!"
  cookieName="myAwesomeCookieName2"
  style={{ background: "#2B373B" }}
  buttonStyle={{ color: "#4e503b", fontSize: "13px" }}
  expires={150}
>
  This website uses cookies to enhance the user experience.{" "}
  <span style={{ fontSize: "10px" }}>This bit of text is smaller :O</span>
</CookieConsent>
```

One of the props (onAccept) is a function, this function will be called after the user has clicked the accept button. It is called with an object containing a boolean property `acceptedByScrolling` to indicate if the acceptance was triggered by the user scrolling You can provide a function like so:

```js
<CookieConsent
  onAccept={(acceptedByScrolling) => {
    if (acceptedByScrolling) {
      // triggered if user scrolls past threshold
      alert("Accept was triggered by user scrolling");
    } else {
      alert("Accept was triggered by clicking the Accept button");
    }
  }}
></CookieConsent>
```

If the decline button is enabled then the (onDecline) prop function can be used, this function will be called after the user has clicked the decline button. You can enable the button and provide a function like so:

```js
<CookieConsent
  enableDeclineButton
  onDecline={() => {
    alert("nay!");
  }}
></CookieConsent>
```

### getting the cookies value in your own code

react-cookie-consent exports a function called `getCookieConsentValue`. You can use it in your own code like so:

```js
import CookieConsent, { Cookies, getCookieConsentValue } from "react-cookie-consent";

console.log(getCookieConsentValue());
```

### reset the cookies value in your own code

react-cookie-consent exports a function called `resetCookieConsentValue`. You can use it in order to remove cookie in client-site:

```js
import CookieConsent, { Cookies, resetCookieConsentValue } from "react-cookie-consent";

console.log(resetCookieConsentValue());
```

That option would be interesting if you want to allow user to change their consent. If you want to show again the consent bar, you must force "visible" prop to show again the bar.

## Props

| Prop                          |                    Type                     | Default value                        | Description                                                                                                                             |
| ----------------------------- | :-----------------------------------------: | ------------------------------------ | --------------------------------------------------------------------------------------------------------------------------------------- |
| location                      |      string, "top", "bottom" or "none"      | "bottom"                             | Syntactic sugar to easily enable you to place the bar at the top or the bottom of the browser window. Use "none" to disable.            |
| visible                       | string, "show", "hidden" or "byCookieValue" | "byCookieValue"                      | Force the consent bar visibility. If "byCookieValue", visibility are defined by cookie consent existence.                               |
| children                      |          string or React component          |                                      | Content to appear inside the bar                                                                                                        |
| disableStyles                 |                   boolean                   | false                                | If enabled the component will have no default style. (you can still supply style through props)                                         |
| hideOnAccept                  |                   boolean                   | true                                 | If disabled the component will not hide it self after the accept button has been clicked. You will need to hide yourself (see onAccept) |
| buttonText                    |          string or React component          | "I understand"                       | Text to appear on the button                                                                                                            |
| declineButtonText             |          string or React component          | "I decline"                          | Text to appear on the decline button                                                                                                    |
| cookieName                    |                   string                    | "CookieConsent"                      | Name of the cookie used to track whether the user has agreed.                                                                           |
| cookieValue                   |         string or boolean or number         | true                                 | Value to be saved under the cookieName.                                                                                                 |
| declineCookieValue            |         string or boolean or number         | false                                | Value to be saved under the cookieName when declined.                                                                                   |
| setDeclineCookie              |                   boolean                   | true                                 | Whether to set a cookie when the user clicks "decline"                                                                                  |
| onAccept                      |                  function                   | `() => {}`                           | Function to be called after the accept button has been clicked.                                                                         |
| onDecline                     |                  function                   | `() => {}`                           | Function to be called after the decline button has been clicked.                                                                        |
| debug                         |                   boolean                   | undefined                            | Bar will be drawn regardless of cookie for debugging purposes.                                                                          |
| expires                       |                   number                    | 365                                  | Number of days before the cookie expires.                                                                                               |
| extraCookieOptions            |                   object                    | `{}`                                 | Extra info (apart from expiry date) to add to the cookie                                                                                |
| overlay                       |                   boolean                   | false                                | Whether to show a page obscuring overlay or not.                                                                                        |
| containerClasses              |                   string                    | ""                                   | CSS classes to apply to the surrounding container                                                                                       |
| buttonClasses                 |                   string                    | ""                                   | CSS classes to apply to the button                                                                                                      |
| buttonWrapperClasses          |                   string                    | ""                                   | CSS classes to apply to the div wrapping the buttons                                                                                    |
| customButtonWrapperAttributes |   `React.HTMLAttributes<HTMLDivElement>`    | `{}`                                 | Allows you to set custom (data) attributes on the button wrapper div                                                                    |
| declineButtonClasses          |                   string                    | ""                                   | CSS classes to apply to the decline button                                                                                              |
| buttonId                      |                   string                    | ""                                   | Id to apply to the button                                                                                                               |
| declineButtonId               |                   string                    | ""                                   | Id to apply to the decline button                                                                                                       |
| contentClasses                |                   string                    | ""                                   | CSS classes to apply to the content                                                                                                     |
| overlayClasses                |                   string                    | ""                                   | CSS classes to apply to the surrounding overlay                                                                                         |
| style                         |                   object                    | [look at source][style]              | React styling object for the bar.                                                                                                       |
| buttonStyle                   |                   object                    | [look at source][buttonstyle]        | React styling object for the button.                                                                                                    |
| declineButtonStyle            |                   object                    | [look at source][declinebuttonstyle] | React styling object for the decline button.                                                                                            |
| contentStyle                  |                   object                    | [look at source][contentstyle]       | React styling object for the content.                                                                                                   |
| overlayStyle                  |                   object                    | [look at source][overlaystyle]       | React styling object for the overlay.                                                                                                   |
| disableButtonStyles           |                   boolean                   | false                                | If enabled the button will have no default style. (you can still supply style through props)                                            |
| enableDeclineButton           |                   boolean                   | false                                | If enabled the decline button will be rendered                                                                                          |
| flipButtons                   |                   boolean                   | false                                | If enabled the accept and decline buttons will be flipped                                                                               |
| ButtonComponent               |               React component               | button                               | React Component to render as a button.                                                                                                  |
| sameSite                      |      string, "strict", "lax" or "none"      | none                                 | Cookies sameSite attribute value                                                                                                        |
| cookieSecurity                |                   boolean                   | undefined                            | Cookie security level. Defaults to true unless running on http.                                                                         |
| ariaAcceptLabel               |                   string                    | Accept cookies                       | Aria label to set on the accept button                                                                                                  |
| ariaDeclineLabel              |                   string                    | Decline cookies                      | Aria label to set on the decline button                                                                                                 |
| acceptOnScroll                |                   boolean                   | false                                | Defines whether "accept" should be fired after the user scrolls a certain distance (see acceptOnScrollPercentage)                       |
| acceptOnScrollPercentage      |                   number                    | 25                                   | Percentage of the page height the user has to scroll to trigger the accept function if acceptOnScroll is enabled                        |
| customContentAttributes       |                   object                    | `{}`                                 | Allows you to set custom (data) attributes on the content div                                                                           |
| customContainerAttributes     |                   object                    | `{}`                                 | Allows you to set custom (data) attributes on the container div                                                                         |
| onOverlayClick                |                  function                   | `() => {}`                           | allows you to react to a click on the overlay                                                                                           |
| acceptOnOverlayClick          |                   boolean                   | false                                | Determines whether the cookies should be accepted after clicking on the overlay                                                         |
| customButtonProps             |                   object                    | `{}`                                 | Allows you to set custom props on the button component                                                                                  |
| customDeclineButtonProps      |                   object                    | `{}`                                 | Allows you to set custom props on the decline button component                                                                          |

## Debugging it

Because the cookie consent bar will be hidden once accepted, you will have to set the prop `debug={true}` to evaluate styling changes:

```js
<CookieConsent debug={true}></CookieConsent>
```

**Note:** Don't forget to remove the `debug`-property for production.

## Why are there two cookies? One of which named "Legacy"

The short story is that some browsers don't support the SameSite=None attribute.
The modern browsers force you to have SameSite set to something other than none.

So react-cookie-consent fixes this like so:

- set the fallback cookie (e.g -legacy) first, this will always succeed (on all browsers)
- set the correct cookie second (this will work on modern browsers, fail on older ones)

This happens on lines [29-37](https://github.com/Mastermindzh/react-cookie-consent/blob/master/src/index.js#L29-L37)

When checking the cookie it'll do it in reverse. If the regular cookie exists, it'll use that. If no regular cookie exists it'll check whether the legacy cookie exists. If both are non-existent no consent was given.

The long story can be found here: [pull-request#68](https://github.com/Mastermindzh/react-cookie-consent/pull/68)

## Styling it

You can provide styling for the bar, the button and the content. Note that the bar has a `display: flex` property as default and is parent to its children "content" and "button".

The styling behaves kind of responsive. The minimum content width has been chosen to be "300px" as a default value. If the button does not fit into the same line it is wrapped around into the next line.

You can style each component by using the `style`, `buttonStyle` and `contentStyle` prop. These will append / replace the default styles of the components.
Alternatively you can provide CSS classnames as `containerClasses`, `buttonClasses` and `contentClasses` to apply predefined CSS classes.

You can use `disableStyles={true}` to disable any built-in styling.

### Examples

#### Changing the bar background to red

```js
<CookieConsent style={{ background: "red" }}></CookieConsent>
```

#### Changing the button font-weight to bold

```js
<CookieConsent buttonStyle={{ fontWeight: "bold" }}></CookieConsent>
```

#### Using predefined CSS classes

You can pass predefined CSS classes to the components using the `containerClasses`, `buttonClasses` and `contentClasses` props. The example below uses bootstrap classes:

```js
<CookieConsent
  disableStyles={true}
  location={OPTIONS.BOTTOM}
  buttonClasses="btn btn-primary"
  containerClasses="alert alert-warning col-lg-12"
  contentClasses="text-capitalize"
>
  This website uses cookies to enhance the user experience.{" "}
  <span style={{ fontSize: "10px" }}>This bit of text is smaller :O</span>
</CookieConsent>
```

Which results in:

![bootstrap styling](https://github.com/Mastermindzh/react-cookie-consent/blob/master/images/css_classes.png?raw=true)

#### Accept on scroll

You can make the cookiebar disappear after scrolling a certain percentage using acceptOnScroll and acceptOnScrollPercentage.
It is legal in some use-cases, [Italy](https://www.garanteprivacy.it/web/guest/home/docweb/-/docweb-display/docweb/9679893) being one of them. Consult your legislation on whether this is allowed.

```js
<CookieConsent
  acceptOnScroll={true}
  acceptOnScrollPercentage={50}
  onAccept={(byScroll) => {
    alert(`consent given. \n\n By scrolling? ${byScroll}`);
  }}
>
  Hello scroller :)
</CookieConsent>
```

#### Flipping the buttons

If you enable the decline button you can pass along the "flipButtons" property to turn the buttons around:

```js
<CookieConsent enableDeclineButton flipButtons>
  Flipped buttons
</CookieConsent>
```

Which results in:

![flipped buttons](./images/flipped.png)

#### Extra cookie options

You can add more cookie options using the extraCookieOptions parameter like so:

```js
<CookieConsent extraCookieOptions={{ domain: "myexample.com" }}>cookie bar</CookieConsent>
```

#### Rainbows!

![rainbows!](https://github.com/Mastermindzh/react-cookie-consent/blob/master/images/rainbow.png?raw=true)

If you're crazy enough you can even make a rainbow colored bar:

```js
<CookieConsent
  buttonText="OMG DOUBLE RAINBOW"
  cookieName="myAwesomeCookieName2"
  style={{
    background: "linear-gradient(to right, orange , yellow, green, cyan, blue, violet)",
    textShadow: "2px 2px black",
  }}
  buttonStyle={{
    background: "linear-gradient(to left, orange , yellow, green, cyan, blue, violet)",
    color: "white",
    fontWeight: "bolder",
    textShadow: "2px 2px black",
  }}
>
  This website uses cookies to enhance the user experience.{" "}
  <span style={{ fontSize: "10px" }}>This bit of text is smaller :O</span>
</CookieConsent>
```

#### Overlay

![overlay](https://github.com/Mastermindzh/react-cookie-consent/blob/master/images/overlay.png?raw=true)

You can also generate a page-obfuscating overlay that will prevent actions other than interacting with the cookie consent button(s).

```js
<CookieConsent location="bottom" cookieName="myAwesomeCookieName3" expires={999} overlay>
  This website uses cookies to enhance the user experience.
</CookieConsent>
```

<!-- links -->

[style]: https://github.com/Mastermindzh/react-cookie-consent/blob/master/src/index.js#L78-L89
[buttonstyle]: https://github.com/Mastermindzh/react-cookie-consent/blob/master/src/index.js#L90-L100
[declinebuttonstyle]: https://github.com/Mastermindzh/react-cookie-consent/blob/master/src/index.js#L101-L111
[contentstyle]: https://github.com/Mastermindzh/react-cookie-consent/blob/master/src/index.js#L112-L115
[overlaystyle]: https://github.com/Mastermindzh/react-cookie-consent/blob/master/src/index.js#L116-L124

## Contributor information

When making a PR please think about the following things:

- Update the ChangeLog (or include what you did in the PR and I'll add it, up to you)
- No need to build or update the package.json. I will do both on release.
- Please don't change code convention / style

## Projects using react-cookie-consent

The list below features the projects which use react-cookie-consent (that I know off):

- [bs-react-cookie-consent](https://github.com/ctbucha/bs-react-cookie-consent)
- [comicrelief's storybook](https://github.com/comicrelief/storybook)
- [inici Gatsby theme](https://github.com/kuworking/gatsby-theme-kuworking-core)
- [Scrivito Example App](https://github.com/Scrivito/scrivito_example_app_js)

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Last updated on 31 Jul 2022

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