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HTML

              
                <!-- 
- Ref: https://gomakethings.com/more-html-less-javascript/ 
- Note: this sol’n requires a server-side (PHP, or Ruby, or Node etc) script endpoint for processing the submitted form data
- Why do we even need JS here? I guess because this is a thing intended for portability and you’ve made the decision that you want error and success messaging to be “white-labelled” on the consuming website rather than user being taken to a separate website, and you don’t know the context’s stack so you’ll use JS to handle the messaging, which then means you need to use JS to orchestrate everything.
- However we don’t need a JS library for this. It’s a pretty straightforward and lightweight combo of DOM manipulation plus fetch(). 
-->

<div class="container">
  <div role="status"></div>
  <form action="/path/to/an/endpoint.php">
    <label for="email">Enter your email</label>
    <input type="email" id="email" name="email">
    <button>Subscribe</button>
  </form>
</div>
              
            
!

CSS

              
                label {
  display: block;
  font-weight: bold;
}

              
            
!

JS

              
                // Get the form and error message elements
let fc = document.querySelector(".container");
let status = fc.querySelector('[role="status"]');
let form = document.querySelector("form");

// Handle submit events
function submitHandler(event) {
  // Stop the form from reloading the page
  event.preventDefault();

  // Validate the email field
  if (!form.email.value) {
    status.textContent = "Please include a valid email address.";
  }

  // Submit the form
  fetch(form.action, {
    method: "POST",
    body: JSON.stringify({ email: form.email.value }),
    headers: {
      Accept: "application/json"
    }
  })
    .then(function (response) {
      return response.json();
    })
    .then(function (data) {
      announce.textContent = data.msg;
    })
    .catch(function (error) {
      announce.textContent = "Something went wrong. Please try again.";
    });
}

// Listen for submit events
form.addEventListener("submit", submitHandler);

              
            
!
999px

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