IndexedDB/idbcursor-continue.htm

<!DOCTYPE html>
<title>IDBCursor.continue()</title>
<link rel="author" href="mailto:odinho@opera.com" title="Odin Hørthe Omdal">
<link rel=help href="http://dvcs.w3.org/hg/IndexedDB/raw-file/tip/Overview.html#widl-IDBCursor-continue-void-any-key">
<link rel=assert title="The next key to position this cursor at">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support.js"></script>

<script>

var store = [ { value: "cupcake", key: 5 },
              { value: "pancake", key: 3 },
              { value: "pie",     key: 1 },
              { value: "pie",     key: 4 },
              { value: "taco",    key: 2 } ];

function upgrade_func(t, db, tx) {
  var db, open;

  var os, i;
  os = db.createObjectStore("test");
  os.createIndex("index", "");

  for (i = 0; i < store.length; i++)
    os.add(store[i].value, store[i].key);
}

indexeddb_test(
  upgrade_func,
  function(t, db) {
    var count = 0;
    var rq = db.transaction("test").objectStore("test").index("index").openCursor();

    rq.onsuccess = t.step_func(function(e) {
      if (!e.target.result) {
        assert_equals(count, 5, 'count');
        t.done();
        return;
      }
      var cursor = e.target.result;

      assert_equals(cursor.value, store[count].value);
      assert_equals(cursor.primaryKey, store[count].key);

      cursor.continue();

      count++;
    });
    rq.onerror = t.unreached_func("unexpected error")
  },
  document.title + " - continues"
);


indexeddb_test(
  upgrade_func,
  function(t, db) {
    var count = 0;
    var rq = db.transaction("test").objectStore("test").index("index").openCursor();

    rq.onsuccess = t.step_func(function(e) {
      if (!e.target.result) {
        assert_equals(count, 3, 'count');
        t.done();
        return;
      }
      var cursor = e.target.result;

      switch(count) {
        case 0:
          assert_equals(cursor.value, "cupcake");
          assert_equals(cursor.primaryKey, 5);
          cursor.continue("pie");
          break;

        case 1:
          assert_equals(cursor.value, "pie");
          assert_equals(cursor.primaryKey, 1);
          cursor.continue("taco");
          break;

        case 2:
          assert_equals(cursor.value, "taco");
          assert_equals(cursor.primaryKey, 2);
          cursor.continue();
          break;

        default:
          assert_unreached("Unexpected count: " + count);
      }

      count++;
    });
    rq.onerror = t.unreached_func("unexpected error")
  },
  document.title + " - with given key"
);


indexeddb_test(
  upgrade_func,
  function(t, db) {
    var count = 0;
    var rq = db.transaction("test").objectStore("test").index("index")
               .openCursor();

    rq.onsuccess = t.step_func(function(e) {
      if (!e.target.result) {
        assert_equals(count, 1, 'count');
        t.done();
        return;
      }
      var cursor = e.target.result;

      switch(count) {
        case 0:
          assert_equals(cursor.value, "cupcake");
          assert_equals(cursor.primaryKey, 5);
          break;

        default:
          assert_unreached("Unexpected count: " + count);
      }

      count++;
      cursor.continue([]); // Arrays are always bigger than strings

    });
    rq.onerror = t.unreached_func("unexpected error2")
  },
  document.title + " - skip far forward"
);


indexeddb_test(
  upgrade_func,
  function(t, db) {
    var count = 0;
    var rq = db.transaction("test").objectStore("test").index("index")
               .openCursor(IDBKeyRange.lowerBound("cupcake", true));

    rq.onsuccess = t.step_func(function(e) {
      if (!e.target.result) {
        assert_equals(count, 2, 'count');
        t.done();
        return;
      }
      var cursor = e.target.result;

      switch(count) {
        case 0:
          assert_equals(cursor.value, "pancake");
          assert_equals(cursor.primaryKey, 3);
          cursor.continue("pie");
          break;

        case 1:
          assert_equals(cursor.value, "pie");
          assert_equals(cursor.primaryKey, 1);
          cursor.continue("zzz");
          break;

        default:
          assert_unreached("Unexpected count: " + count);
      }

      count++;
    });
    rq.onerror = t.unreached_func("unexpected error1")
  },
  document.title + " - within range"
);


indexeddb_test(
  upgrade_func,
  function(t, db) {
    var count = 0;
    var rq = db.transaction("test").objectStore("test").index("index")
               .openCursor("pancake");

    rq.onsuccess = t.step_func(function(e) {
      if (!e.target.result) {
        assert_equals(count, 1, 'count');
        t.done();
        return;
      }
      var cursor = e.target.result;

      switch(count) {
        case 0:
          assert_equals(cursor.value, "pancake");
          assert_equals(cursor.primaryKey, 3);
          cursor.continue("pie");
          break;

        default:
          assert_unreached("Unexpected count: " + count);
      }

      count++;
    });
    rq.onerror = t.unreached_func("unexpected error1")
  },
  document.title + " - within single key range"
);

indexeddb_test(
  upgrade_func,
  function(t, db) {
    var count = 0;
    var rq = db.transaction("test").objectStore("test").index("index")
               .openCursor("pie");

    rq.onsuccess = t.step_func(function(e) {
      if (!e.target.result) {
        assert_equals(count, 2, 'count');
        t.done();
        return;
      }
      var cursor = e.target.result;

      switch(count) {
        case 0:
          assert_equals(cursor.value, "pie");
          assert_equals(cursor.primaryKey, 1);
          cursor.continue();
          break;

        case 1:
          assert_equals(cursor.value, "pie");
          assert_equals(cursor.primaryKey, 4);
          cursor.continue();
          break;

        default:
          assert_unreached("Unexpected count: " + count);
      }

      count++;
    });
    rq.onerror = t.unreached_func("unexpected error1")
  },
  document.title + " - within single key range, with several results"
);

</script>