idbcursor-reused.htm

   1 <!DOCTYPE html>
   2 <title>IDBCursor is reused</title>
   3 <link rel="author" href="mailto:odinho@opera.com" title="Odin Hørthe Omdal">
   4 <meta rel=help href="http://dvcs.w3.org/hg/IndexedDB/raw-file/tip/Overview.html#widl-IDBCursor-continue-void-any-key">
   5 <meta rel=assert title="Otherwise this method runs the steps for asynchronously executing a request. However, the steps are slightly modified such that instead of creating a new IDBRequest, it reuses the request originally created when this cursor was created. The done flag on the request is set to false before the request is returned. The steps are run with the cursor's source as source and the steps for iterating a cursor as operation, using this cursor as cursor and the key parameter as key.">
   6 <script src="/resources/testharness.js"></script>
   7 <script src="/resources/testharnessreport.js"></script>
   8 <script src="resources/support.js"></script>
   9
  10 <script>
  11
  12         var db
  13         var open_rq = createdb(async_test())
  14
  15         open_rq.onupgradeneeded = function(e) {
  16             db = e.target.result
  17             var os = db.createObjectStore("test")
  18
  19             os.add("data",  "k")
  20             os.add("data2", "k2")
  21         }
  22
  23         open_rq.onsuccess = function(e) {
  24             var cursor
  25             var count = 0
  26             var rq = db.transaction("test", "readonly", {durability: 'relaxed'}).objectStore("test").openCursor()
  27
  28             rq.onsuccess = this.step_func(function(e)
  29             {
  30                 switch(count)
  31                 {
  32                     case 0:
  33                         cursor = e.target.result
  34
  35                         assert_equals(cursor.value, "data", "prequisite cursor.value")
  36                         cursor.custom_cursor_value = 1
  37                         e.target.custom_request_value = 2
  38
  39                         cursor.continue()
  40                         break
  41
  42                     case 1:
  43                         assert_equals(cursor.value, "data2", "prequisite cursor.value")
  44                         assert_equals(cursor.custom_cursor_value, 1, "custom cursor value")
  45                         assert_equals(e.target.custom_request_value, 2, "custom request value")
  46
  47                         cursor.advance(1)
  48                         break
  49
  50                     case 2:
  51                         assert_false(!!e.target.result, "got cursor")
  52                         assert_equals(cursor.custom_cursor_value, 1, "custom cursor value")
  53                         assert_equals(e.target.custom_request_value, 2, "custom request value")
  54                         break
  55                 }
  56                 count++
  57             })
  58
  59             rq.transaction.oncomplete = this.step_func(function() {
  60                 assert_equals(count, 3, "cursor callback runs")
  61                 assert_equals(rq.custom_request_value, 2, "variable placed on old IDBRequest")
  62                 assert_equals(cursor.custom_cursor_value, 1, "custom cursor value (transaction.complete)")
  63                 this.done()
  64             })
  65         }
  66
  67 </script>
  68
  69 <div id="log"></div>