There's been some years since Internet Explorer launched their IndexedDB support. The IE version however, lacked the support for compound and multivalued indexes. Since summer 2014, all major browsers including the latest version of Safari support the IndexedDB specification, even though the Safari implementation isn't yet robust. Now it's only IE that is the odd fellow that lacks the support for compound and multiEntry indexes.

• Chrome has it!
• Firefox has it!
• Opera has it!
• Safari has it!
• Internet Explorer has it "almooooost", if it wasn't for that irritating multiEntry / compound index support!!!

This polyfill makes IE10 / IE11 support the complete IndexedDB specification by implementing support for compound and multiEntry index as well as using compound primary keys.

Download the source yourself, or use bower:

bower install idb-iegap

It is now possible to have an index compound by an array of keyPaths making it possible to do more efficient intersection (AND) operations. In the last commit, I also made support for using an array as keyPath for the ObjectStore itself (the primary key will is compound). This is specified in the IDB specification and tested in W3C web-platform-test suite.

It is now possible to have a multiValued index - that is, letting a property of a persistant object be an array and automatically index each item in the array, so that it is possible to lookup the object based on any of the keys stored in its array-property.

The polyfill is tested against the W3C web-platform-test suite that applies to IndexedDB and multi-entry and compund indexes. A fork of the W3C web-platform-test suite that includes this polyfill, can be run at: http://testidbiegap.dexie.org. The source of the fork is found here: https://github.com/dfahlander/web-platform-tests

The polyfill is tested with the unit tests of Dexie.js.

Please help me test, bugfix, simplify, optimize and spread this polyfill.