Attribute helpers for Twig.js

A Twig.js extension that allows you to work more easily with html attributes inside Twig templates. The API mimics the Attribute objects in Drupal.

Getting started

npm install --save @whitespace/twig-extension-attribute-helpers

Import the extension and pass it your Twig object:

import Twig from 'twig';
import extendWithAttributeHelpers from '@whitespace/twig-extension-attribute-helpers';

// Adds the `attributes` function
extendWithAttributeHelpers(Twig);

let data = `<a{{ attributes({
  href: '#',
  class: ['btn', 'btn-primary']
}) }}>`;
let output = Twig.twig({ data }).render();
// output === `<a href="#" class="btn btn-primary">`
});

Twig API

attributes(attrs)

Creates and Attribute object containing the passed attributes and values. attrs should be an object. When rendered it is serialized as HTML attributes. Example:

<a{{ attributes({
  href: '#',
  class: ['btn', 'btn-primary']
}) }}>

Output:

<a href="#" class="btn btn-primary">

.setAttibute(attr, value)

Sets an attribute on an already created Attribute object:

{% set linkAttributes = attributes({
  href: '#'
}) %}
<a{{ linkAttributes.setAttribute('target', '_blank') }}>

Output:

<a href="#" target="_blank">

.removeAttibute(attr)

Unsets a previously set attribute

{% set linkAttributes = attributes({
  href: '#',
  target: '_blank'
}) %}
<a{{ linkAttributes.removeAttribute('target') }}>

Output:

<a href="#">

.addClass(...classNames)

Adds one or more classes to the class attribute.

{% set linkAttributes = attributes({
  href: '#'
}) %}
<a{{ linkAttributes.addClass('btn', 'btn-primary') }}>

Output:

<a href="#" class="btn btn-primary">

.removeClass(...classNames)

Removes one or more classes from the class attribute.

{% set linkAttributes = attributes({
  href: '#',
  class: ['btn', 'btn-primary']
}) %}
<a{{ linkAttributes.removeClass('btn-primary') }}>

Output:

<a href="#" class="btn">

Other functions

• setAttributes(attrs)
• getAttribute()
• getAttributes()
• hasAttribute(attr)
• getClass()
• hasClass(className)