Newsletter

Demonstration

Newsletter

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Code

The Newsletter Object is an embedded MailChimp signup form. More details about embedded MailChimp forms can be found on the MailChimp website. This form can work with any Mailchimp subscriber list that is configured through the form action;

form action="https://nyc.us18.list-manage.com/subscribe/post?u={{ mailchimp account }}&id={{ form id }}" method="post" id="mc-embedded-subscribe-form"

While the Newsletter Object doesn’t require JavaScript, it is needed for submitting the form without leaving the page and for front-end validation.

Demonstration

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Code
Global Script

The Newsletter Pattern requires JavaScript for submitting the form without leaving the page and for front-end validation.

<script src="https://cdn.jsdelivr.net/gh/nycopportunity/standard@v0.0.16/dist/js/default.js"></script>

<script>
  var Standard = new Default();

  Standard.newsletter('/path/to/full/form');
  Standard.newsletterForm();
</script>

Standard.newsletter('/path/to/full/form') instantiates the default Newsletter form field. It will pass the data from the MailChimp subscription response as URL parameters to a specified endpoint set as the first (and only) argument.

Standard.newsletterForm() instantiates the Full Newsletter form field. It will automatically handle the response passed as URL parameters from the single form field and display the response for the submission.

Note. It is recommended that data passed via URL parameters be validated.

Module Import

The Newsletter source exists in the Patterns Scripts utility library, which is a dependency of this library. Pass a selected newsletter element that contains the form to the instantiated object and set the parent selector for input validation messaging.

import Newsletter from '@nycopportunity/pttrn-scripts/src/newsletter/newsletter';

let element = document.querySelector('[data-js="newsletter-form"]');

let newsletter = new Newsletter(element);

newsletter.form.selectors.ERROR_MESSAGE_PARENT = '.c-question__container';
Setting a custom callback

The Standard.newsletter() method uses a custom callback to the window that the MailChimp subscription endpoint sends response data to. Below is an example of this.

// ...

let newsletter = new Newsletter(element);

// ...

// Use the instantiated Newsletter's unique callback key
window[newsletter.callback] = data => {
  data.response = true;

  // Set email to the data so it is passed along
  data.email = element.querySelector('input[name="EMAIL"]').value;

  // Set the window location to redirect to the form with URL parameters from the response
  window.location = '/path/to/full/form?' + Object.keys(data)
    .map(k => `${k}=${encodeURI(data[k])}`).join('&');
};
Pre-populating a response

The Standard.newsletterForm() Below is an example the global script uses to pre-populate the Newsletter response in the full form using URL parameters.

// ...

let newsletter = new Newsletter(element);

// ...

let params = new URLSearchParams(window.location.search);
let email = params.get('email');
let input = element.querySelector('input[name="EMAIL"]');

// Populate the email field on the form
input.value = email;

// Set the instantiated Newsletter's data store
newsletter._data = {
  result: params.get('result'),
  msg: params.get('msg'),
  EMAIL: email
};

// Pass the data to the Newsletter's callback function for displaying messaging
newsletter._callback(newsletter._data);

View the Standard.newsletterForm() method source at js/default.js for a full example.