Contents

class addFields {
  // This executes when the function is instantiated.
  constructor() {
    this.links = document.querySelectorAll('.add_fields')
    this.iterateLinks()
    const event = new Event('works_cited:load')
    window.dispatchEvent(event);
  }

  iterateLinks() {
    // If there are no links on the page, stop the function from executing.
    if (this.links.length === 0) return
    // Loop over each link on the page. A page could have multiple nested forms.
    this.links.forEach(link => {
      link.addEventListener('click', e => {
        this.handleClick(link, e)
      })
    })
  }

  handleClick(link, e) {
    // Stop the function from executing if a link or event were not passed into the function.
    if (!link || !e) return
    // Prevent the browser from following the URL.
    e.preventDefault()
    // Save a unique timestamp to ensure the key of the associated array is unique.
    let time = new Date().getTime()
    // Save the data id attribute into a variable. This corresponds to `new_object.object_id`.
    let linkId = link.dataset.id
    // Create a new regular expression needed to find any instance of the `new_object.object_id` used in the fields data attribute if there's a value in `linkId`.
    let regexp = linkId ? new RegExp(linkId, 'g') : null
    // Replace all instances of the `new_object.object_id` with `time`, and save markup into a variable if there's a value in `regexp`.
    let newFields = regexp ? link.dataset.fields.replace(regexp, time) : null
    // Add the new markup to the form if there are fields to add.
    newFields ? link.insertAdjacentHTML('beforebegin', newFields) : null
    // Tell it new fields are there
    const event = new Event('works_cited:add_fields')
    window.dispatchEvent(event);
  }
}

// Wait for turbolinks to load, otherwise `document.querySelectorAll()` won't work
window.addEventListener('load', () => new addFields())
window.addEventListener('works_cited:add_fields', () => new addFields())

Version data entries

2 entries across 2 versions & 1 rubygems

Version	Path
works_cited-0.1.16	app/assets/javascripts/works_cited/addFields.js
works_cited-0.1.15	app/assets/javascripts/works_cited/addFields.js