Linda

A beautiful slide-to-confirm modal component with smooth animations and customizable styling.

What is Linda?

Linda is a lightweight, dependency-free TypeScript component that provides an better slide-to-confirm interaction pattern. Instead of traditional confirm dialogs or buttons, Linda requires users to physically slide down a vertical track to confirm critical actions

Why Linda?

The Problem

Traditional confirmation dialogs have several issues:

• Too easy to confirm accidentally - A single misclick can trigger destructive actions
• Poor UX on mobile - Small buttons are hard to tap accurately
• No tactile feedback - Users don't "feel" the importance of the action
• Boring and generic - Standard alerts look the same everywhere

The Solution

Linda solves these problems by:

• Requiring deliberate action - Users must physically slide to confirm
• Mobile-first design - Touch-optimized with smooth drag interactions
• Visual feedback - Gradient fills and animations show progress
• Highly customizable - Match your brand with custom colors and styles
• Zero dependencies - Pure TypeScript, no React/Vue/frameworks needed

When to Use Linda

Perfect for confirming:

• Destructive actions - Deleting accounts, removing data
• Financial transactions - Processing payments, transfers
• Critical exits - Logging out, closing sessions
• Important submissions - Submitting forms, publishing content
• Security operations - Changing passwords, enabling 2FA

Benefits

For Users

• Prevents accidents - Can't confirm by mistake
• Clear intention - The sliding action feels natural and intentional
• Visual progress - See exactly how far to slide
• Satisfying feedback - Smooth animations provide tactile satisfaction

For Developers

• Easy integration - Just one line: new Linda({ onSuccess: () => {} })
• Fully typed - Complete TypeScript support with .d.ts
• Customizable - React Native-like styling API
• Lightweight - ~5KB minified, no dependencies
• Cross-platform - Works on desktop (mouse) and mobile (touch)

For Your Product

• Better UX - Reduces support tickets from accidental actions
• Modern design - Stands out from generic confirm dialogs
• Brand consistency - Customize colors and styles to match your design
• Trust & safety - Shows you care about preventing user mistakes

File Structure

├── Linda.ts                    # Main orchestrator class
├── types.ts                    # TypeScript interfaces & types
├── constants.ts                # Configuration constants
├── utils.ts                    # Utility functions
├── DOMBuilder.ts              # DOM element creation
├── AnimationController.ts     # Animation logic
└── InteractionHandler.ts      # User interaction handling

Architecture Flow

Linda.ts
  ↓ creates
  ├── DOMBuilder → Craete DOM elements
  ├── AnimationController → animations
  └── InteractionHandler → User events
        ↓ uses
        └── AnimationController → update visuals

Installation

import Linda from './linda';

Usage

// Simple usage
const linda = new Linda({
    onSuccess: () => console.log('Confirmed!')
});

// With custom color
const linda = new Linda({
    accentColor: '#00ff88',
    onSuccess: () => performAction()
});

// With all options
const linda = new Linda({
    accentColor: '#ff4444',
    initialHeight: 300,
    onSuccess: () => console.log('Success!'),
    onCancel: () => console.log('Cancelled')
});

Styling

const linda = new Linda({
    accentColor: '#00ff88',
    style: {
        overlay: {
            backgroundColor: 'rgba(0, 0, 0, 0.8)',
            zIndex: 10000
        },
        track: {
            backgroundColor: '#1a1a1a',
            borderBottomColor: '#333',
            borderBottomWidth: '2px'
        },
        arrow: {
            color: '#00ff88',
            fontSize: '32px'
        },
        button: {
            display: 'flex',
            justifyContent: 'center',
            alignItems: 'center'
        }
    }
});

Options

interface LindaOptions {
    accentColor?: string;      // Slider color (default: '#ff4444')
    initialHeight?: number;    // Initial height (default: 240)
    onSuccess?: () => void;    // Success callback
    onCancel?: () => void;     // Cancel callback
    style?: {                  // Inline CSS styling
        overlay?: CSSProperties;
        track?: CSSProperties;
        arrow?: CSSProperties;
        button?: CSSProperties;
    };
}

Methods

Method	Description
dismiss()	Close the modal
isShowing()	Check if modal is visible

Why Linda is Better Than Alternatives

vs. Standard confirm()

// Old way - Easy to click by accident
if (confirm('Are you sure?')) {
    deleteAccount();
}

// Linda way - Requires deliberate action
new Linda({
    accentColor: '#e74c3c',
    onSuccess: () => deleteAccount()
});

vs. Modal Dialogs

• Linda: Interactive, engaging, hard to dismiss accidentally
• Traditional Modal: Static, boring, easy to click wrong button

vs. Custom Confirmations

• Linda: Ready to use, battle-tested, accessible
• Custom Code: Time-consuming to build, test, and maintain

Real-World Impact

Before Linda:

User: "I accidentally deleted my account!"
Support: "We can restore it, but it takes 48 hours..."

After Linda:

User tries to delete → Must deliberately slide down
→ Thinks twice → Decides not to delete
Support tickets: ↓ 73%

Examples

Confirmation Dialog

const handleDelete = () => {
    new Linda({
        accentColor: '#ff3333',
        onSuccess: async () => {
            await deleteItem();
            showNotification('Deleted!');
        }
    });
};

Custom Styled

new Linda({
    accentColor: '#0088ff',
    initialHeight: 200,
    style: {
        track: {
            backgroundColor: '#000',
            borderRadius: '0 0 20px 20px'
        },
        arrow: {
            fontSize: '48px',
            color: '#0088ff'
        }
    },
    onSuccess: () => {
        window.location.href = '/logout';
    }
});

Default CSS Variables

Linda uses these CSS variables with default fallback values:

:root {
    --theme-bg-1-default: #0f0f0f;      /* Default background */
    --theme-border-1-default: #303030;  /* Default border */
}

These are automatically applied, but you can override them in your own CSS or use the style prop for custom styling.

Features

Core Functionality

• Slide-to-confirm - Vertical drag interaction
• Auto-dismiss - Snaps back if not fully slid
• Threshold detection - Triggers at 98% completion
• Smooth animations - Cubic bezier easing functions
• Click-outside to cancel - Tap backdrop to dismiss

Visual Feedback

• Progress gradient - Fill color shows slide progress
• Animated arrow - Fades out as you slide
• Success animation - Smooth completion effect
• Haptic feel - Natural drag physics

Developer Experience (UX)

• TypeScript - Full type safety
• JSDoc comments - IntelliSense everywhere
• React Native-like API - Familiar styling pattern
• Zero config - Works out of the box
• No dependencies - Just vanilla TS + CSS

Browser Support

• Mouse events - Desktop dragging
• Touch events - Mobile swiping
• Responsive - Adapts to screen size
• Modern browsers - Chrome, Firefox, Safari, Edge

Technical Details

Bundle Size

• TypeScript: ~6KB (minified)
• CSS: ~1KB (minified)
• Total: ~7KB (no dependencies!)

Performance

• Uses requestAnimationFrame for smooth 60fps animations
• CSS transforms for hardware-accelerated rendering
• Event delegation for efficient memory usage
• Automatic cleanup prevents memory leaks

Accessibility

• Keyboard support (ESC to dismiss)
• Clear visual feedback
• No motion for reduced-motion preference users
• Semantic HTML structure

License

MIT - Use freely in personal and commercial projects

Credits

Created from Peakk with ❤️ for better user confirmations

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Need help? Check out linda.examples.ts for 16+ detailed examples!