Very Eager (3.0)

Magnetic Effect (snapEagerness: 3.0)

Configuration: { snapEagerness: 3.0 }

This creates an intentional "magnetic" attraction to the top edge - the snapping becomes a deliberate design feature rather than just gap prevention.

🎯 When Magnetic Behavior Makes Sense

Use snapEagerness: 3.0 when snapping should be a visible, intentional part of the user experience:

• ✅ Gaming interfaces: Where snappy, responsive behavior feels appropriate
• ✅ Interactive dashboards: When headers need to feel "alive" and responsive
• ✅ Design systems with strong snap language: Where eager transitions fit the design philosophy
• ✅ Zero gap tolerance: Absolutely no visual artifacts allowed
• ⚠️ Very obvious snapping: Movement is clearly artificial

🔬 Three-Step Prediction Algorithm

The magnetic effect predicts three scroll frames ahead:

const handleScroll = () => {
  const currentScrollY = window.scrollY;
  const elementRect = element.getBoundingClientRect();
  
  // Calculate current scroll velocity
  const scrollVelocity = currentScrollY - lastScrollY;
  
  // Predict THREE scroll steps ahead - creates the magnetic effect
  const predictedTop = elementRect.top - 3.0 * scrollVelocity;
  //                                      ↑
  //                        snapEagerness: 3.0 = predict 3 steps ahead
  
  // Switch to sticky very early - creates the "magnetic" attraction
  if (mode === 'relative' && predictedTop >= 0) {
    mode = 'sticky';
    element.style.position = 'sticky';
    element.style.top = '0';
  }
}

🧲 Understanding the Magnetic Effect

What makes this feel "magnetic":

• Early activation: Header switches to sticky well before reaching the top
• Obvious prediction: The anticipation becomes part of the visual effect
• Deliberate artificiality: Movement clearly feels programmed, not natural
• Snappy character: Creates a distinctive interaction personality

🎮 Gaming and Interactive Applications

The magnetic effect fits well in certain contexts:

• Game UIs: Where snappy behavior enhances the responsive feel
• Creative tools: When headers need to feel "smart" and predictive
• Real-time dashboards: Where immediate response is more important than natural feel
• Mobile apps with strong interaction language: Where users expect eager responses

🧪 Testing the Magnetic Behavior

Experience the full magnetic effect with these tests:

• Slow approach: Watch the header "jump" into sticky mode early
• Medium speed: The magnetic attraction should be very obvious
• Fast scrolling: Absolutely no gaps, immediate snapping
• Micro-movements: Even tiny upward scrolls trigger the magnetic effect
• Stop and go: The header should feel eager to snap at any opportunity

⚡ When NOT to Use Magnetic Snapping

Avoid 3.0+ values when:

• Content-focused sites: Reading experiences where distraction should be minimal
• Professional/corporate interfaces: Where natural movement is expected
• Subtle design languages: When interface elements should be unobtrusive
• Users value natural feel: When seamless experience is the priority

🎨 Design Integration

Making magnetic snapping work with your design:

• Consistent interaction language: Other elements should also feel snappy
• Clear visual hierarchy: Make sure the header deserves the attention
• Animation coordination: Other transitions should match the energetic feel
• User expectation setting: Early interactions should establish the snappy character

📊 Comparison with Other Values

The full snapEagerness spectrum:

• snapEagerness: 0.0 - Pure natural movement
• snapEagerness: 1.0 - Balanced default
• snapEagerness: 2.0 - Aggressive gap prevention
• snapEagerness: 3.0 ← You are here (Intentional magnetic effect)
• snapEagerness: 4.0+ - Even more extreme (rarely needed)

🔧 Fine-tuning Beyond 3.0

You can go even higher:

• snapEagerness: 4.0-5.0: For ultra-responsive gaming interfaces
• Custom values: 3.5, 2.7, etc. for precise tuning
• Dynamic adjustment: Change eagerness based on user behavior or device type

Continue scrolling to experience the full magnetic effect. Notice how the header seems to have its own agenda - it's not just following your scroll, it's actively trying to snap into position. This creates a very different feel from natural movement.

The magnetic effect works best when users understand it's intentional - when the eager snapping becomes part of your app's character rather than feeling like a bug or glitch.