<!DOCTYPE html> <meta charset="utf-8"> <title>IDBIndex.count() - throw DataError when using invalid key</title> <link rel="author" title="Intel" href="http://www.intel.com"> <link rel="help" href="https://dvcs.w3.org/hg/IndexedDB/raw-file/tip/Overview.html#widl-IDBIndex-count-IDBRequest-any-key"> <script src="/resources/testharness.js"></script> <script src="/resources/testharnessreport.js"></script> <script src="support.js"></script> <div id="log"></div> <script> var db, t = async_test(); var open_rq = createdb(t); open_rq.onupgradeneeded = function(e) { db = e.target.result; var store = db.createObjectStore("store", { autoIncrement: true }); store.createIndex("index", "indexedProperty"); for(var i = 0; i < 10; i++) { store.add({ indexedProperty: "data" + i }); } } open_rq.onsuccess = function(e) { var index = db.transaction("store") .objectStore("store") .index("index"); assert_throws("DataError", function() { index.count(NaN); }); t.done(); } </script>