Every in-flight upload persists to IndexedDB automatically. With persistBlobs: true, File objects are stored too - uploads auto-resume after tab crashes or page reloads without re-picking files. Works with chunked, s3, and tus strategies: each resume preserves the server session (chunk offsets, S3 part ETags, or tus URL) so the resumed task continues from exactly where it stopped.
Try it: pick a large file, start uploading, reload the page (F5) before it finishes. The task auto-rehydrates from IndexedDB and continues from the last completed chunk.
Configuration
AjaxUploader.create('#uploader', {
uploadUrl: '/ajaxupload.axd/upload',
chunkUrl: '/ajaxupload.axd/chunk',
chunked: true,
persistState: true,
persistAdapter: 'indexeddb', // or 'localStorage' persistBlobs: true // store File blobs for zero-click resume
});
Rehydrate on load
uploader.on('stateRestored', function (state) {
state.resumableTasks.forEach(function (entry) {
// entry.blob present when persistBlobs=true; else pass a re-picked File: uploader.resumeFromState(entry /* , file */);
});
});
What gets persisted
- Always: task id, file metadata, strategy, progress, hash, per-chunk byte counts, S3
uploadId + part ETags, tus session URL. - With
persistBlobs: true: the File object itself (IndexedDB stores Blobs natively). - Never: upload tokens with limited lifetimes - those are re-fetched on resume.