IDBRequest: success 事件
當 IDBRequest 成功時,會觸發 success 事件。在 success 事件處理程式中,你可以訪問請求的結果,並向同一事務發出更多請求。
此事件不可取消,也不會冒泡。
語法
在諸如 addEventListener() 之類的方法中使用事件名稱,或設定事件處理程式屬性。
js
addEventListener("success", (event) => { })
onsuccess = (event) => { }
事件型別
一個通用的 Event。
示例
此示例嘗試開啟一個數據庫並使用 addEventListener() 監聽 success 事件。
js
// Open the database
const openRequest = window.indexedDB.open("toDoList", 4);
openRequest.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 });
};
openRequest.addEventListener("success", (event) => {
console.log("Database opened successfully!");
});
相同的示例,但使用 onsuccess 事件處理程式屬性。
js
// Open the database
const openRequest = window.indexedDB.open("toDoList", 4);
openRequest.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 });
};
openRequest.onsuccess = (event) => {
console.log("Database opened successfully!");
};
規範
| 規範 |
|---|
| Indexed Database API 3.0 # eventdef-idbrequest-success |
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