IDBCursorWithValue

IDBCursorWithValue interface of the IndexedDB API represents a cursor for traversing or iterating over multiple records in a database. It is the same as the IDBCursor , except that it includes the value 特性。

The cursor has a source that indicates which index or object store it is iterating over. It has a position within the range, and moves in a direction that is increasing or decreasing in the order of record keys. The cursor enables an application to asynchronously process all the records in the cursor's range.

You can have an unlimited number of cursors at the same time. You always get the same IDBCursorWithValue object representing a given cursor. Operations are performed on the underlying index or object store.

注意: 此特征可用于 Web 工作者 .

方法

Inherits methods from its parent interface, IDBCursor .

特性

继承特性来自其父级接口 IDBCursor .

IDBCursorWithValue.value 只读
Returns the value of the current cursor.

范例

In this example we create a transaction, retrieve an object store, then use a cursor to iterate through all the records in the object store. T he cursor does not require us to select the data based on a key; we can just grab all of it. Also note that in each iteration of the loop, you can grab data from the current record under the cursor object using cursor.value.foo . For a complete working example, see our IDBCursor example ( view example live .)

function displayData() {
  var transaction = db.transaction(['rushAlbumList'], "readonly");
  var objectStore = transaction.objectStore('rushAlbumList');
  objectStore.openCursor().onsuccess = function(event) {
    var cursor = event.target.result;
    if(cursor) {
      var listItem = document.createElement('li');
      listItem.innerHTML = cursor.value.albumTitle + ', ' + cursor.value.year;
      list.appendChild(listItem);
      cursor.continue();
    } else {
      console.log('Entries all displayed.');
    }
  };
};
					

规范

规范 状态 Comment
Indexed Database API 2.0
The definition of 'IDBCursorWithValue' in that specification.
Recommendation
Indexed Database API Draft
The definition of 'IDBCursorWithValue' in that specification.
Recommendation

浏览器兼容性

更新 GitHub 上的兼容性数据
Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari Android webview Chrome for Android Firefox for Android Opera for Android Safari on iOS Samsung Internet
IDBCursorWithValue Chrome 24
24
23 — 57
Prefixed
Prefixed Implemented with the vendor prefix: webkit
Edge 12 Firefox 16
16
10 — 16
Prefixed
Prefixed Implemented with the vendor prefix: moz
IE 部分支持 10 Opera 15 Safari 7 WebView Android Yes
Yes
? — 57
Prefixed
Prefixed Implemented with the vendor prefix: webkit
Chrome Android 25
25
25 — 57
Prefixed
Prefixed Implemented with the vendor prefix: webkit
Firefox Android 22 Opera Android 14 Safari iOS 8 Samsung Internet Android 1.5
1.5
1.5 — 7.0
Prefixed
Prefixed Implemented with the vendor prefix: webkit
value Chrome 24
24
23 — 24
Prefixed
Prefixed Implemented with the vendor prefix: webkit
Edge 12 Firefox 16
16
10 — 16
Prefixed
Prefixed Implemented with the vendor prefix: moz
IE 部分支持 10 Opera 15 Safari 7 WebView Android Yes Chrome Android Yes Firefox Android 22 Opera Android 14 Safari iOS 8 Samsung Internet Android Yes
Available in workers Chrome Yes Edge ≤18 Firefox 42 IE ? Opera Yes Safari ? WebView Android Yes Chrome Android Yes Firefox Android 42 Opera Android Yes Safari iOS ? Samsung Internet Android Yes

图例

完整支持
完整支持
部分支持
部分支持
兼容性未知
兼容性未知
要求使用供应商前缀或不同名称。
要求使用供应商前缀或不同名称。

另请参阅