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Templating with Nunjucks.md

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Templating With Nunjucks

This app includes support for including components using a custom nunjucks tag. This method allows components to be available in all layouts, views, includes and macros and allows each component to be a separating entity which makes maintaining and testing them easier.

To include a component with its default state or one that expects no data:

{% component 'person' %}

To include a component and pass data to it:

{% component 'person', {
  name: 'Barry',
  age: '55'
} %}

Component can take multiple arguments. It will combine them in single object:

res.render('some-page', {
  personData: {
    name: 'Barry',
    age: 55,
  },
})
{% component 'person', personData, gender='male' %}

Is the same as:

{% component 'person', {
  name: 'Barry',
  age: '55',
  gender: 'male'
} %}

Templates

Templates use Nunjuck's template inheritance. There are several top level blocks which are used for injecting content during rendering. Each subsequent template that extends the base layout can include these additional blocks.

Nunjucks base template blocks

Template block names are structured by combining main element names to form path. e.g. head wraps everything inside the head element, the same applies to headIcons.

  • _layouts/template.njk extends govuk-frontend/template.njk - the GOV.UK frontend template Data Hub extends from

<head>

  • pageTitle - contains the page title
  • headIcons - contains various GOV.UK icons
  • head - overridden by Data Hub containing mainly <meta>, <link> and <script> tags

</head>

</body>

  • bodyStart - contains Google Tag Manager (GTM) and the notification banner
  • skipLink - a GOV.UK "skip to content" link
  • header - overridden by Data Hub
    • header_site_title - wraps the site title
    • header_menu - wraps the header menu
    • local_header - wraps header content specific to the app
  • main - Data Hub overrides the GOV.UK main block
    • content - overridden by Data Hub
      • local_nav - wraps navigation specific to the app
      • body_main_content - contains main content (inside main#content)
  • footer - contains a GOV.UK footer which DataHub overrides with an empty block
  • bodyEnd - initialise scripts (e.g. app.js and GOV.UK frontend)

</body>

Base template variables

Base layout checks for certain variables.

  • siteTitle {string} - name of the site. Defaults to 'Department for Business and Trade'.
  • serviceTitle {string} - name of the service.
  • phaseBanner {boolean} - whether to show the separate phase banner or default to phase tag in the global header. Possible values: true and false.
  • projectPhase {string} - phase of the project. Possible values: alpha and beta.