This is a prototype. We don't recommend using it in production.

Character count is a component that:

• helps users provide information in a limited number of characters
• tells users how many characters they have remaining by counting down as they type
• provides feedback for assistive technology so that all users are aware of the character limit
• shows the number of remaining words or characters

This component will be part of the govuk-frontend, a single package containing everything needed to start building a GOV.UK service.

• Character count
• Word count
• Character count with threshold
• Character count with highlight

[Screenshot]

• [link to Design System]
• contribution guidelines

This component prototype has been built using govuk_prototype_kit.

Dependencies:

• alphagov/govuk-elements-sass

• For using the component in your service download char-count.js and character-count.scss, place them in your project's assets folder then follow the usage instructions below.
• For testing the component prototype on your local machine follow the govuk_prototype_kit installation instructions

1. Set the maxlength attribute and add a javascript handler class or id (e.g. .js-char-count). Note that the textarea must have an id attribute set to a unique value within the page.

<textarea id="description-field" class="form-control js-char-count" rows="5" maxlength="500"></textarea>

2. Enhance the textarea by initialising a charCount instance on the specified handler (e.g. .js-char-count)

var charCount = new GOVUK.CharCount()
charCount.init({
  selector: '.js-char-count'
})

1. Since there is no maxwords attribute in HTML5, use data-maxwords attribute to set the maximum number of words and add a javascript handler class (e.g. .js-word-count). Note that the textarea must have an id attribute set to a unique value within the page.

<input id="name-field" class="form-control js-word-count" type="text" data-maxwords="10">

<textarea id="description-field" class="form-control js-word-count" rows="5" data-maxwords="30"></textarea>

2. Enhance the textarea by initialising a charCount instance on the specified handler (e.g. .js-word-count) to display word count. For initialising the Word Count you must add wordCount: true to the options of the init function.

var charCount = new GOVUK.CharCount()
charCount.init({
  selector: '.js-word-count',
  wordCount: true
})

You can display the count message when the users are at 50% or more setting a percentage value as threshold.

var charCount = new GOVUK.CharCount()
charCount.init({
  selector: '.js-char-count',
  wordCount: true,
  threshold: 50
})

You can also visually highlight the characters which have taken users over the limit by setting the highlight option to true. This can make it easier for some users to see how far over they are and edit their content to fit. However, for some lower confidence, it can cause confusion.

var charCount = new GOVUK.CharCount()
charCount.init({
  selector: '.js-char-count',
  highlight: true
})

The acceptance criteria describes the necessary behaviours a character count needs to meet to be usable by assistive technologies.