$ show blueimp/jQuery-File-Upload
jQuery File Upload is a mature, feature-rich jQuery plugin for handling file uploads in web browsers. It provides multiple file selection, drag & drop support, progress bars, client-side image resizing, preview functionality, and supports cross-domain, chunked, and resumable uploads. The architecture follows jQuery widget patterns with a modular plugin system that separates concerns into core functionality, processing pipelines, media handling, validation, UI components, and transport mechanisms. The code demonstrates sophisticated handling of browser inconsistencies and edge cases while maintaining a clean, extensible design.
The LLM identified 5 files worth highlighting for reuse:
Implements a generic processing queue system for file uploads that allows chaining of asynchronous operations (validation, preprocessing, etc.) using jQuery Deferreds. Demonstrates skill in creating a flexible pipeline that can be extended with custom processing steps while maintaining proper error handling and state management.
Adds file validation capabilities to the upload processing queue in a decoupled manner. Shows how to integrate validation steps that run regardless of previous step outcomes through the 'always: true' option, providing robust file type, size, and quantity validation.
Handles complex image processing including loading, EXIF metadata extraction, orientation correction, resizing, and preview generation. Demonstrates sophisticated multi-step image manipulation that adapts to browser capabilities and handles various image formats properly.
Provides a clean abstraction for iframe-based file uploads to support legacy browsers without XHR capabilities. Shows proper handling of iframe communication, form submission, and cross-browser response parsing while maintaining security.
Implements cross-domain communication using the postMessage API for file uploads to different domains. Demonstrates secure cross-domain messaging with origin validation and proper message passing between frames.