Page Comparison

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Reactivity is a core concept in modern web development, especially in the context of Single-Page Applications (SPAs). SPAs, such as those built with React, Vue.js, and Angular, aim to provide a seamless and responsive user experience by dynamically updating the UI in response to user interactions and data changes. In this article, we will explore reactivity in SPAs and how it relates to integrating third-party services like PayFields.

Reactivity in SPAs

Reactivity in SPAs refers to the ability of the application to automatically update the user interface (UI) when data changes occur. SPAs typically load a single HTML page and then use JavaScript frameworks like React, Vue.js, or Angular to manipulate and update the DOM (Document Object Model) dynamically.

Key Concepts of Reactivity in SPAs

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1. Virtual DOM: React, for example, uses a Virtual DOM to represent the UI. When data changes, React compares the new Virtual DOM with the previous one to calculate the minimum number of changes needed to update the actual DOM.

2. Components: In React and Vue.js, UI elements are structured as components. Each component can have its own state and props (properties) and is responsible for rendering a part of the UI. When a component's state or props change, it re-renders itself.

3. Data Binding: Angular, on the other hand, uses two-way data binding. When data in the model changes, the view updates automatically, and vice versa.

4. Asynchronous Operations: SPAs often involve asynchronous operations, such as making API requests. These operations can trigger changes in the UI when responses are received.

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Now, let's dive into how reactivity works with Payrix PayFields and why a setTimeout function is necessary in in the JavaScript.

Integrating

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PayFields

Payrix PayFields is a payment processing embedded solution that allows you to securely handle sensitive payment information, such as credit card numbers, within a web application. When integrating PayFields into an SPA, you want to ensure a smooth and secure user experience. However, PayFields operates independently and asynchronously, which can create challenges when it comes to reactivity.

Challenges in Reactivity with

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PayFields

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Dynamic Loading

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PayFields loads its scripts and resources dynamically to enhance security. This means that the PayFields library might not be available immediately when an SPA loads.

iFrame Integration

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PayFields uses

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iFrames to isolate and secure payment-related data. These

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iFrames need to be added to the DOM when the PayFields library is ready.

Reactivity Delay

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SPAs often expect immediate reactivity, but PayFields might not be ready instantly. This is why you see a setTimeout function in the JavaScript file.

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Understanding

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setTimeout in

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the PayFields Integration

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Here's why it's necessary:

Script Loading:

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PayFields is loaded asynchronously from an external source (<script src="<https://test-api.payrix.com/payFieldsScript>"></script>). The browser fetches this script, and it may take some time to download and execute.

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iFrame Generation: PayFields generates the

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iFrames for payment fields within its library. These

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iFrames are inserted into the DOM. However, this process takes time, and the

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iFrames might not be available immediately after the script is loaded.

Timing: The setTimeout function provides a delay of 1 second before you call PayFields.addFields(). This delay allows the PayFields library to complete any internal initialization, including the generation and insertion of

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iFrames.

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Reactivity: By waiting for a short period, you ensure that when you call PayFields.addFields(), the iframes are present in the DOM and can be manipulated reactively by an SPA.

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The setTimeout function acts as a synchronization mechanism between an SPA and the PayFields library, allowing you to ensure that the payment field iFrames are ready for interaction. While this delay might seem like a workaround, it's a practical solution to handle the asynchronous nature of external services like PayFields within the context of SPAs, where immediate reactivity is expectedreactivity is expected.

Reactivity: By waiting for a short period, you ensure that when you call PayFields.addFields(), the iFrames are present in the DOM and can be manipulated reactively by an SPA.

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Walking through a PayFields Example of Reactivity

<!-- Bootstrap CSS -->
<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-EVSTQN3/azprG1Anm3QDgpJLIm9Nao0Yz1ztcQTwFspd3yD65VohhpuuCOmLASjC" crossorigin="anonymous">

<div class="container">
    <div class="row">
        <div class="col-8 offset-2">
          <p>Customer Name:</p>
          <input type="text" id="newName" class="input" placeholder="Customer Name">
          <p>Email:</p>
          <input type="email" id="email" class="input" placeholder="Email Address">
          <div id="box">
            <p>Customer Name</p>
            <div class="con" id="name"></div>
            <p>Number:</p>
              <div class="con" id="number"></div>
              <p>Expiration:</p>
              <div class="con" id="expiration"></div>
            <p>CVV:</p>
              <div class="con" id="cvv"></div>
          </div>
            <p>Country:</p>
            <input type="text" id="country" class="input" placeholder="Country">
            <p>Zip Code:</p>
            <input type="zip" id="zip" class="input" placeholder="Zip Code">
            <br>
            <button type="button" id="btn" class="btn btn-md btn-success text-white float-end">Make Payment</button>
        </div>
    </div>
</div>

<style>

    div .con {
        height: 55px;
        border-right: 1rem
    }
    /*
    Match the CSS styles with PayField styles
    */
    .input {
      display: block;
      width: 100%;
      padding: 1.25rem 1.75rem 1.25rem 1rem;
      font-size: .825rem;
      font-weight: 400;
      line-height: 1.5rem;
      border: none;
      background-color: #fff;
      background-clip: padding-box;
      border-bottom: 1px solid #ddd;
      appearance: none;
      outline: none;
      height: 1.25rem;
      line-height: 2px;
    }

</style>

<!-- jQuery -->
<script type="text/javascript" src="https://code.jquery.com/jquery-2.2.4.min.js"></script>
<!-- Sandbox URL -->
<script type="text/javascript" src="https://test-api.payrix.com/payFieldsScript"></script>
<!-- Option 1: Bootstrap Bundle with Popper -->
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/js/bootstrap.bundle.min.js" integrity="sha384-MrcW6ZMFYlzcLA8Nl+NtUVF0sA7MsXsP1UyJoMp4YLEuNSfAP+JcXn/tWtIaxVXM" crossorigin="anonymous"></script>

<script>

// Configurations
PayFields.config.apiKey = ''
PayFields.config.merchant = ''
PayFields.config.mode = 'txn';
PayFields.config.txnType = 'auth'
PayFields.config.amount = 1000

PayFields.fields = [
  {
    type: "number",
    element: "#number"
  },
  {
    type: "name",
    element: "#name"
  },
  {
    type: "cvv",
    element: "#cvv",
  },
  {
    type: "expiration",
    element: "#expiration",
  }
];

PayFields.customizations.style = {
    ".input": {
        display: "block",
        width: "100%",
        padding: "0.5rem 0.9rem",
        fontSize: ".825rem",
        fontWeight: "400",
        backgroundColor: "#fff",
        backgroundClip: "padding-box",
        borderBottom: "1px solid #ddd",
        appearance: "none",
        height: "1.25rem",
        borderRight: "1px solid #ddd"
    },
    ".form-error": {
        color: "#980000"
    }
};

document.querySelector("#newName").addEventListener('blur', function() {
  // If we remove all iframesiFrames, the iframe-main will also be removed which is the parent wrapper of each PayFields.fields.
  // With this approach, iframe-main will remain within the DOM, and child DIV's are removed.
  let expiration = document.querySelector('iframe#payFields-iframe-expiration')
  let name = document.querySelector('iframe#payFields-iframe-name')
  let cvv = document.querySelector('iframe#payFields-iframe-cvv')
  let number = document.querySelector('iframe#payFields-iframe-number')

  // Remove all divs to re-mount all iFrames to the DOM
  expiration.remove()
  name.remove()
  cvv.remove()
  number.remove()

  setTimeout(() => {
  PayFields.fields = [
  {
    type: "name",
    element: "#name",
    values: {
      name: document.querySelector('#newName').value
    }
  },
  {
    type: "number",
    element: "#number"
  },
  {
    type: "cvv",
    element: "#cvv",
  },
  {
    type: "expiration",
    element: "#expiration",
  }

];
  
  PayFields.addFields()

  // 1 second will allow adequate time for the iFrames to be mounted to the DOM
}, 1000);
})

document.querySelector('#btn').addEventListener('click', function() {
    PayFields.config.billingAddress = {
      zip: document.querySelector('#zip').value,
      email: document.querySelector('#email').value,
      country: document.querySelector('#country').value
    };
    PayFields.submit()
})

// Failure Callback
PayFields.onFailure = function(err) {
  console.log(err)
}

// Success Callback
PayFields.onSuccess = function(response) {
  console.log(response)
}
</script>

Configuration (PayFields.config)

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Defining Payment Fields (PayFields.fields)

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Several objects are defined within the PayFields.fields array. These objects specify the types of payment fields and the corresponding DOM elements where they should be rendered.

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Customizing Styles (PayFields.customizations.style)

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Styles for the payment fields are customized using the PayFields.customizations.style object. The styles are defined for elements with the class .input and for elements with the class .form-error. These styles control the appearance of the payment fields and error messages.

Event Listeners:

document.querySelector("#newName").addEventListener('blur', function() { ... })

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document.querySelector('#btn').addEventListener('click', function() { ... })

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Callback Functions:

PayFields.onFailure = function(err) { ... }

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PayFields.onSuccess = function(response) { ... }

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setTimeout Function

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Explained

The setTimeout function is used within the 'blur' event listener for a specific purpose:

• After removing iframes iFrames associated with payment fields, a timeout of 1000 milliseconds (1 second) is introduced using setTimeout. This delay allows time for any asynchronous processes, like the creation and mounting of new iframes iFrames by PayFields, to complete. After the timeout, new payment fields are defined and PayFields.addFields() is called to re-mount the iframesiFrames.

This delay ensures that PayFields is given enough time to update and re-render the payment fields based on the modified data. Without this delay, there might be a rare condition where PayFields doesn't have enough time to update before the addFields() function is called.