Access Javascript function return value in Elixir/Phoenix controller

Question

I am using Stripe.js to make payment in my phoenix application.

I want to use the tokenized payment method, for this I have to pass the card information in a form and make a call to Stripe.createToken(card) method.

Once, I receive the token I want to use it in one of the controllers of my phoenix application. I don't have much experience with phoenix. Can somebody, suggest how to pass the token I receive from Stripe.createToken(card) into the controller?

code for page.html

<form action="/charge" method="post" id="payment-form">
  <div class="form-row">
    <label for="card-element">
      Credit or debit card
    </label>
    <div id="card-element">
      <!-- a Stripe Element will be inserted here. -->
    </div>

    <!-- Used to display form errors -->
    <div id="card-errors" role="alert"></div>
    </div>
    <button class="btn btn-primary">Submit Payment</button>
  </form>

js code

// Create a Stripe client
var stripe = Stripe('pk_test_xx96UepEgmX12vaKbpJp1p70');

// Create an instance of Elements
var elements = stripe.elements();

// Custom styling can be passed to options when creating an Element.
// (Note that this demo uses a wider set of styles than the guide below.)
var style = {
  base: {
    color: '#32325d',
    lineHeight: '18px',
    fontFamily: '"Helvetica Neue", Helvetica, sans-serif',
    fontSmoothing: 'antialiased',
    fontSize: '16px',
    '::placeholder': {
      color: '#aab7c4'
    }
  },
  invalid: {
    color: '#fa755a',
    iconColor: '#fa755a'
  }
};

// Create an instance of the card Element
var card = elements.create('card', {style: style});

// Add an instance of the card Element into the `card-element` <div>
card.mount('#card-element');

// Handle real-time validation errors from the card Element.
card.addEventListener('change', function(event) {
  var displayError = document.getElementById('card-errors');
  if (event.error) {
    displayError.textContent = event.error.message;
  } else {
    displayError.textContent = '';
  }
});

// Handle form submission
var form = document.getElementById('payment-form');
form.addEventListener('submit', function(event) {
  event.preventDefault();

  stripe.createToken(card).then(function(result) {
    console.log('card-result', result);
    if (result.error) {
      // Inform the user if there was an error
      var errorElement = document.getElementById('card-errors');
      errorElement.textContent = result.error.message;
    } else {
      // Send the token to your server
    }
  });

You can use plugin to save the token and use that plugin in the controller. — script
– script, Commented Jan 2, 2018 at 13:22
Just do a regular ajax request, or redirect to another page and put the token in either a get or post variable. — Justin Wood
– Justin Wood, Commented Jan 2, 2018 at 14:39
Ok, it came to my mind but I didn't know whether it was the right approach. Thanks. — Arjun Singh
– Arjun Singh, Commented Jan 2, 2018 at 18:35

ryanwinchester · Accepted Answer · 2018-01-03 22:45:01Z

So, in your stripe.createToken().then() promise callback you can send the token to your server.

I use axios, but you can use plain JS XHR, or jquery, or whatever you want.

Example:

stripe.createToken(card).then(function(result) {
  console.log('card-result', result);
  if (result.error) {
    // Inform the user if there was an error
    var errorElement = document.getElementById('card-errors');
    errorElement.textContent = result.error.message;
  } else {
    axios.post('/my-route-to-controller', {card_token: result.token})
      .then(function (response) {
        // do something with success
      })
      .catch(function (error) {
        // do something with error
      })
  }
});

Then you make sure you have /my-route-to-controller in your Router and your controller function will look something like:

def create(conn, %{"card_token" => card_token}) do
  # do something with your `card_token`
end

Although you will probably want to submit more params. Just add them to the ajax request and match them in your controller.

Solution 2

Another option would be to add the token value to a hidden form input and just submit the form.

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