IDBDatabase: close event

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范例
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close event is fired on IDBDatabase when the database connection is unexpectedly closed. This could happen, for example, if the underlying storage is removed or if the user clears the database in the browser's history preferences.

Note that it is not fired if the database connection is closed normally using IDBDatabase.close() .

冒泡	No
可取消	No
接口	`事件`
事件处理程序特性	`onerror`

范例

This example opens a database and listens for the close event:

// Open the database
const dBOpenRequest = window.indexedDB.open('toDoList', 4);
dBOpenRequest.onupgradeneeded = (event) => {
  const db = event.target.result;
  // Create an objectStore for this database
  const objectStore = db.createObjectStore('toDoList', { keyPath: 'taskTitle' });
  // define what data items the objectStore will contain
  objectStore.createIndex('hours', 'hours', { unique: false });
  objectStore.createIndex('minutes', 'minutes', { unique: false });
  objectStore.createIndex('day', 'day', { unique: false });
  objectStore.createIndex('month', 'month', { unique: false });
  objectStore.createIndex('year', 'year', { unique: false });
};
dBOpenRequest.onsuccess = (event) => {
  const db = dBOpenRequest.result;
  db.addEventListener('close', () => {
    console.log('Database connection closed');
  });
};

The same example, using the onclose property instead of addEventListener() :

// Open the database
const dBOpenRequest = window.indexedDB.open('toDoList', 4);
dBOpenRequest.onupgradeneeded = (event) => {
  const db = event.target.result;
  // Create an objectStore for this database
  const objectStore = db.createObjectStore('toDoList', { keyPath: 'taskTitle' });
  // define what data items the objectStore will contain
  objectStore.createIndex('hours', 'hours', { unique: false });
  objectStore.createIndex('minutes', 'minutes', { unique: false });
  objectStore.createIndex('day', 'day', { unique: false });
  objectStore.createIndex('month', 'month', { unique: false });
  objectStore.createIndex('year', 'year', { unique: false });
};
dBOpenRequest.onsuccess = (event) => {
  const db = dBOpenRequest.result;
  db.onclose = () => {
    console.log('Database connection closed');
  };
};

浏览器兼容性

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. 更新 GitHub 上的兼容性数据

	桌面						移动
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`close` event	Chrome 31	Edge ≤18	Firefox 50	IE ?	Opera Yes	Safari 10.1	WebView Android Yes	Chrome Android 31	Firefox Android 50	Opera Android Yes	Safari iOS 10.3	Samsung Internet Android 2.0

图例

完整支持
兼容性未知 ?

另请参阅

使用 IndexedDB
onclose event handler property

元数据

最后修改： Mar 18, 2019

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范例

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