📝 Advanced Notepad Editor Tool

A feature-rich, multi-tab text editor with autosave, undo/redo, search & replace, sidebar file explorer, and persistent LocalStorage support.

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Overview

The Advanced Notepad Editor allows users to create, edit, and manage multiple documents in a clean, tab-based interface. Every file you create is automatically stored in LocalStorage, which means your notes remain saved even after closing or refreshing the browser --- without requiring manual downloads.

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Features

Core Functionality

• Multi-Tab Editor
  Create, rename, switch between, and close tabs at any time.

• Persistent Auto-Save (LocalStorage)
  File contents are saved automatically on every keystroke.

• Automatic Session Restore
  When you reopen the app, all files and tabs are restored from LocalStorage.

• Undo / Redo Functionality
  Each tab maintains its own undo and redo history.

• Search & Replace
  Built-in search (find) and replace, including "Replace All".

• Modified File Indicator
  Tabs show a dot (●) when content is unsaved.

• Word / Character / Line Count
  Real-time editor statistics.

• Responsive Layout
  Works across desktop and mobile.

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LocalStorage File System

How Saving Works

• Files are saved continuously while typing.
• A file is never deleted automatically.
• Closing a tab does not remove the file from LocalStorage.
• Files can only be deleted manually from the sidebar delete button.

What Is Not Saved

To avoid JSON corruption: - undoStack\

• redoStack

These are reconstructed fresh on each load.

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Sidebar File Manager

Features

• Displays a full list of saved files
• Hover to reveal a Delete button
• Click file → Opens in active tab
• Delete removes file permanently from LocalStorage

No Deletion on Tab Close

Closing a tab does not delete the file --- it stays available in the sidebar until explicitly removed.

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Loading Files

When the Notepad loads: 1. It fetches notepad_files from LocalStorage
2. Rebuilds all file tabs
3. Initializes fresh undo/redo stacks for each file
4. Displays the last active file

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Search & Replace

• Find text inside current file\
• Replace single match\
• Replace all matches\
• Case-sensitive & whole-word support (optional)

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Keyboard Shortcuts

Shortcut Action

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Ctrl + N Create new tab Ctrl + W Close tab Ctrl + F Search text Ctrl + H Replace text Ctrl + Z Undo Ctrl + Shift + Z Redo

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Error Handling

Common Issues Handled Automatically

• LocalStorage full
• Corrupted file entries
• Missing fields on load
• Invalid tab states

Validation

• Pure JSON saved (no functions or closures)
• Undo/redo trimmed to avoid memory overflow

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Browser Compatibility

• Chrome 60+
• Firefox 55+
• Safari 12+
• Edge 79+
• Mobile browsers supported

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Notes & Best Practices

• Keep filenames short for clean sidebar layout\
• Avoid storing extremely large files (>5MB) in LocalStorage\
• Use sidebar delete option to free storage\
• useTranslations allows multilingual editor support

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Last updated: 2025