如何从IndexedDB中的objectstore.put()返回自动增量ID? [英] How to return auto increment id from objectstore.put() in an IndexedDB?

问题描述

使用objectstore.put()将记录插入IndexedDB后，如何返回自动递增的ID?

How do I return the auto incremented ID after inserting a record into an IndexedDB using objectstore.put()?

下面是我的代码:

idb.indexedDB.addData = function (objectStore, data) {
    var db = idb.indexedDB.db;
    var trans = db.transaction([objectStore], READ_WRITE);
    var store = trans.objectStore(objectStore);
　
　
　
    var request = store.put(data);
    request.onsuccess = function (e) {
        //Success, how do I get the auto incremented id?
    };
    request.onerror = function (e) {
        console.log("Error Adding: ", e);
    };
};

推荐答案

使用 e.target.result .由于API是异步的，因此必须使用callback来获取返回值，如下所示:

Use e.target.result. Since the API is async, you must use callback to get the return value, as follow:

idb.indexedDB.addData = function (objectStore, data, callback) {
    var db = idb.indexedDB.db;
    var trans = db.transaction([objectStore], READ_WRITE);
    var store = trans.objectStore(objectStore);
　    　
    var request = store.put(data);
    request.onsuccess = function (e) {
        callback(e.target.result);
    };
    request.onerror = function (e) {
        console.log("Error Adding: ", e);
        callback(undefined);
    };
};

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