Working Offline

YAPL supports full offline editing for plans. Once you've loaded a plan while online, you can continue working on it even without internet connection. Your changes are automatically saved to your device and sync when you're back online.

Quick Start

What Works Offline

Full Functionality

These features work exactly the same offline:

Requires Internet

How It Works

Automatic Draft Creation

When you edit a plan, YAPL automatically creates a local draft on your device:

1. You make a change - Any edit triggers draft creation
2. Auto-save kicks in - Changes save locally every 500ms
3. Draft badge appears - Version selector shows "Draft" indicator
4. Work continues offline - No network needed for editing

Your Data Is Safe

YAPL uses multiple safeguards to protect your work:

• Frequent auto-save - Every 500ms after changes
• Background save - Saves when you switch browser tabs
• Full snapshots - Complete plan state saved, not just changes
• Integrity checks - Data verified on save and load
• Safe version switching - Pending changes saved before switching

Working Offline Scenarios

Scenario 1: Field Work Without Internet

Before leaving:

1. Open YAPL and navigate to your plan
2. Make a small edit (triggers draft creation)
3. Look for "Draft" indicator in version selector

On the job site:

• Edit tasks, update progress, adjust schedules
• Critical path calculations continue automatically
• All changes save to your device

Back at the office:

1. Connect to internet
2. Click Publish to save to cloud
3. Team members see your updates

Scenario 2: Internet Drops Mid-Edit

What happens:

• You keep working normally
• Nothing appears different in the interface
• Changes continue saving locally
• Critical path keeps calculating

When reconnected:

• Just click Publish when ready
• No special recovery needed

Scenario 3: Extended Offline Work

Process:

1. Prepare draft while online (open plan, make one edit)
2. Work offline for hours or days
3. Reconnect when convenient
4. Publish to sync with team

There's no time limit - offline drafts work indefinitely.

Understanding Drafts

Draft vs. Published

Finding Your Drafts

Drafts appear in the Version Selector dropdown with a "Draft" badge:

Version Selector
├── Current State (live)
├── v3 "Approved" (published)
├── v2 "Initial" (published)
└── v3 Draft 1 ← Your offline work

Multiple Drafts

You can have multiple drafts for different versions:

• Each published version can have its own draft
• Drafts are independent and don't conflict
• Switch between drafts freely

Critical Path Offline

The Critical Path Method (CPM) calculation works fully offline:

How It Works

1. Web Worker - Calculations run in a background thread
2. No Network Required - All algorithms are bundled with the app
3. Auto Calculation - Updates after task changes (500ms delay)
4. Manual Option - "Recalculate" button available anytime

CPM Modes

Your CPM mode preference is saved with your draft.

Installing YAPL (PWA)

For the best offline experience, install YAPL as an app:

Desktop (Chrome/Edge)

1. Visit YAPL in Chrome
2. Click the install icon (⊕) in address bar
3. Click "Install YAPL"
4. App opens in its own window

iOS (Safari)

1. Open YAPL in Safari
2. Tap Share button (□↗)
3. Tap "Add to Home Screen"
4. Tap "Add"

Android (Chrome)

1. Open YAPL in Chrome
2. Tap menu (⋮)
3. Tap "Install app"
4. Follow prompts

Benefits of Installation

Troubleshooting

"Cannot load draft offline"

Cause: Draft was created before offline support (older version)

Solution:

1. Connect to internet
2. Open the plan
3. Make any small edit
4. A new draft with offline support is created

"Draft not found"

Cause: Browser data was cleared, or different browser

Solution:

• Drafts are stored per browser/device
• Connect to internet and load the plan again
• Make a new edit to create fresh draft

"Changes didn't publish"

Cause: Was offline when clicking Publish

Solution:

1. Check internet connection
2. Click Publish again
3. Wait for success confirmation

Slow performance with large plans

Tip: Plans with 400+ tasks may feel slower offline

Solutions:

• Use CPM "Single" mode instead of "Auto"
• Close other browser tabs
• Install YAPL as PWA for better performance

Best Practices

Before Going Offline

1. Prepare your drafts - Open and edit each needed plan
2. Verify draft creation - Check for Draft badge
3. Test offline - Enable airplane mode briefly to confirm

While Offline

1. Work normally - All editing features work
2. Trust auto-save - No need to manually save
3. Use undo freely - Full history available (Ctrl+Z)

After Reconnecting

1. Review changes - Check your draft before publishing
2. Publish promptly - Don't leave drafts for too long
3. Coordinate with team - Let others know you're syncing

Technical Details

Storage

Undo/Redo

Auto-Save Timing

Related Topics

• Plan Versions - Version management
• Publishing Plans - Syncing to cloud
• Critical Path - CPM details
• Timeline View - Gantt editing