IDBTransaction: complete 事件

当事务成功提交时，IndexedDB API 的 complete 事件将被触发，这可能是您显式调用 IDBTransaction.commit() 之后，也可能是所有请求都成功完成，并在处理其结果后，没有放置新的请求。有关更多信息，请参见 IDBTransaction。

语法

在诸如 addEventListener() 之类的方法中使用事件名称，或者设置事件处理程序属性。

addEventListener("complete", (event) => {});
oncomplete = (event) => {};

事件类型

一个通用的 Event。

示例

使用 addEventListener()

// Open the database
const DBOpenRequest = window.indexedDB.open("toDoList", 4);

DBOpenRequest.onupgradeneeded = (event) => {
  const db = event.target.result;

  db.onerror = () => {
    console.log("Error creating database");
  };

  // 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;

  // open a read/write db transaction, ready for adding the data
  const transaction = db.transaction(["toDoList"], "readwrite");

  // add a listener for `complete`
  transaction.addEventListener("complete", (event) => {
    console.log("Transaction was completed");
  });

  const objectStore = transaction.objectStore("toDoList");
  const newItem = {
    taskTitle: "my task",
    hours: 10,
    minutes: 10,
    day: 10,
    month: "January",
    year: 2019,
  };
  const objectStoreRequest = objectStore.add(newItem);

  objectStoreRequest.onsuccess = () => {
    // Issue a second request in the onsuccess handler,
    // so we can run this request after the first one completes,
    // while still reusing the same transaction
    const getAllRequest = objectStore.getAll();

    getAllRequest.onsuccess = () => {
      // No more requests, so the transaction completes after running this handler
      console.log(getAllRequest.result);
    };
  };
};

浏览器兼容性

BCD 表仅在启用 JavaScript 的浏览器中加载。

另请参阅

使用 IndexedDB