react-cookie-consent

:cookie: react-cookie-consent :cookie:

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

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

Default look

Table of contents

• :cookie: react-cookie-consent :cookie:
  • Default look
  • Table of contents
  • Installation
  • Using it
    • getting the cookies value in your own code
    • reset the cookies value in your own code
  • Props
  • Debugging it
  • Why are there two cookies? One of which named "Legacy"
  • Styling it
    • Examples
      • Changing the bar background to red
      • Changing the button font-weight to bold
      • Using predefined CSS classes
      • Accept on scroll
      • Flipping the buttons
      • Extra cookie options
      • Rainbows
      • Overlay
  • Contributor information
  • Projects using react-cookie-consent

Installation

npm install react-cookie-consent

or use yarn:

yarn add react-cookie-consent

Using it

You can import the cookie bar like this:

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:

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

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

<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):

<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:

<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:

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

getting the cookies value in your own code

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

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

console.log(getCookieConsentValue("your_custom_cookie_name"));

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:

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. Note that you also have to pass this to the getCookieConsentValue and resetCookieConsentValue functions as they default to "CookieConsent" as well.
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	React styling object for the bar.
buttonStyle	object	look at source	React styling object for the button.
declineButtonStyle	object	look at source	React styling object for the decline button.
contentStyle	object	look at source	React styling object for the content.
overlayStyle	object	look at source	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:

<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

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

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

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

Changing the button font-weight to bold

<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:

<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:

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 being one of them. Consult your legislation on whether this is allowed.

<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:

<CookieConsent enableDeclineButton flipButtons>
  Flipped buttons
</CookieConsent>

Which results in:

Extra cookie options

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

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

Rainbows

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

<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

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

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

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
• comicrelief's storybook
• inici Gatsby theme
• Scrivito Example App