Loading Spinner Button

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Loading Spinner Button</title>
    <style>
        /*
         Component: Loading Spinner Button
         Description: A button that shows a spinner during a simulated loading state.
        */

:root {
            --loader-btn-bg: #007bff;
            --loader-btn-text-color: #ffffff;
            --loader-btn-bg-hover: #0069d9;
            --loader-btn-focus-outline: #007bff;
            --loader-spinner-color: #ffffff;
        }

.loading-container-1 {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            display: flex;
            justify-content: center;
            align-items: center;
            padding: 2rem;
            background-color: #f8f9fa;
        }

.loading-btn-1 {
            position: relative;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            min-width: 180px;
            padding: 0.9rem 1.8rem;
            font-size: 1.1rem;
            font-weight: 600;
            color: var(--loader-btn-text-color);
            background-color: var(--loader-btn-bg);
            border: none;
            border-radius: 8px;
            cursor: pointer;
            transition: background-color 0.2s ease-in-out;
        }

.loading-btn-1 .btn-text {
            transition: opacity 0.2s ease;
        }

/* --- Loading State --- */
        .loading-btn-1.is-loading .btn-text {
            opacity: 0;
        }
        
        .loading-btn-1.is-loading {
            cursor: wait;
        }

.loading-btn-1.is-loading,
        .loading-btn-1:hover.is-loading {
            background-color: var(--loader-btn-bg);
        }
        
        .loading-btn-1:focus-visible {
            outline: 3px solid var(--loader-btn-focus-outline);
            outline-offset: 2px;
        }

/* --- Spinner Animation --- */
        .loading-btn-1::after {
            content: '';
            position: absolute;
            width: 20px;
            height: 20px;
            top: 50%;
            left: 50%;
            margin-top: -10px;
            margin-left: -10px;
            border: 3px solid rgba(255, 255, 255, 0.4);
            border-top-color: var(--loader-spinner-color);
            border-radius: 50%;
            animation: spin 1s linear infinite;
            opacity: 0;
            transition: opacity 0.2s ease;
        }

.loading-btn-1.is-loading::after {
            opacity: 1;
        }

@keyframes spin {
            to {
                transform: rotate(360deg);
            }
        }
    </style>
</head>
<body>

<div class="loading-container-1">
        <button type="button" class="loading-btn-1" id="loadingBtn1">
            <span class="btn-text">Process Data</span>
        </button>
    </div>

loadingButton.addEventListener('click', function() {
                // Ignore click if already loading
                if (this.classList.contains('is-loading')) {
                    return;
                }
                
                this.classList.add('is-loading');
                this.disabled = true;

// Simulate a network request or processing time
                setTimeout(() => {
                    this.classList.remove('is-loading');
                    this.disabled = false;
                }, 3000);
            });
        });
    </script>

</body>
</html>