Phoenix liveview with Stripe element not working

Hey there,

I have a liveview that is being live rendered inside a usual eex new template, and in this liveview I have this for stripe:

  <%= if @show_stripe_credit_form do %>
  <div class="field" phx-hook="Test">
    <%= label f, "Credit Card", class: "label" %>
    <div id="card-element" style="border: 1px solid #DFE0E0" class="b-r-4 p-2">
      <!-- Elements will create input elements here -->
    </div>

    <!-- We'll put the error messages in this element -->
    <p id="card-errors" role="alert" class="has-text-danger m-t-1">

    </p>
  </div>
  <% end %>

I also have a separate file with the js which works on another page of the app without liveview element, but it doesn’t seem to hook into this one. Here is the js:

<script src="https://js.stripe.com/v3/"></script>
<script>
  document.addEventListener('DOMContentLoaded', () => {
    if (!document.getElementById('card-element')) {
      return
    }

    var stripe = Stripe('<%= System.get_env("STRIPE_PUBLISHABLE_KEY") %>');
    var elements = stripe.elements({
      fonts: [
        {
          cssSrc: 'https://use.typekit.net/gjk6uuk.css',
        },
      ],
    });

    var style = {
      base: {
        color: "#32325d",
        fontFamily: 'sofia-pro, avenir next, avenir, BlinkMacSystemFont, -apple-system, "Segoe UI", "Roboto", sans-serif',
      },
      invalid: {
        color: "#FF495C",
        iconColor: "#fa755a"
      }
    };

    var card = elements.create("card", { style: style });
    card.mount("#card-element");

    card.addEventListener('change', function(event) {
      var displayError = document.getElementById('card-errors');
      if (event.error) {
        displayError.textContent = event.error.message;
      } else {
        displayError.textContent = '';
      }
    });

    let form  = document.getElementById('ticket-order-form');
    console.log(form)
    let submitButton  = document.getElementById('submit-button');

    form.addEventListener('submit', (event) => {
      event.preventDefault()
      submitButton.disable = true;
      stripe.createToken(card).then(function(result) {
        if (result.error) {
          // show error
          errorElement = document.getElementById('card-errors')
          errorElement.textContent = result.error.message
          submitButton.disable = false;
        } else {
          // add stripeToken to form and submit
          stripeTokenHandler(result.token)
        }
      });
    });

    function stripeTokenHandler(token) {
      console.log(token)
      hiddenInput = document.createElement('input')
      hiddenInput.setAttribute('type', 'hidden')
      hiddenInput.setAttribute('name', 'stripeToken')
      hiddenInput.setAttribute('value', token.id)
      form.appendChild(hiddenInput)

      form.submit()
    }
  });
</script>

My question is where do I need to add this in order to be applied in the liveview every time the liveview changes, because I hide the field based on changes on the page?

Thanks!

When you “live navigate” that piece of JS won’t be run again. For liveview pages, you could listen on this event: phx:page-loading-stop.

1 Like

Thanks, by any chance could you give a bit more practical direction, or example?

Add another event listener like the one you have for DOMContentLoaded, but for phx:page-loading-stop and on the window object.

window.addEventListener('phx:page-loading-stop', () => {
   ...
});

See if this gets you closer to your objective. Then, since you say you need to react every time the liveview changes, you could properly hook it up via a liveview hook.

1 Like

Doesn’t seem to make any difference unfortunately, in general it seems like the js has no effect, it doesn’t change the div visually.

How are you adding the JS to the page?

In the code snippet above you have two <script> tags. Are you rendering that within the template itself?

I had a similar issue getting some Bootstrap JS to register if they were injected into the page. With that page-loading-stop hook there, you still need to get all your markup loaded on the page before it fires. In the case that started this thread, that “<%= if … %>” is probably causing that code to render after some handle_event, and after the page-loading-stop callback.

In some cases, I’m able to use “display: none” and “display: block” instead so the code is loaded before the callback, but that doesn’t work in all cases unfortunately.

1 Like

I encountered this because I had the same issue yesterday. I’m rendering multiple payment sources via LiveView and needed my scripts to execute every update else widgets would not be rendered on change or the scripts for Stripe would not run. None of the phx emitted event listeners are a valid solution to this.

My solution was to put a phx-hook="ChangePaymentOption on the container div of each of the payment options with the hook utilising the mounted function. I didn’t think this was viable at first until I realised I could push new Hooks directly onto the liveSocket:

let paymentMethod;

if (window.liveSocket) {
  window.liveSocket.hooks.ChangePaymentOption = {
    mounted() {
      paymentMethodContainer = this.el;

      if (paymentMethodFoo) {
        initPayment();
      }
   }
}
1 Like