181 lines
6.3 KiB
HTML
181 lines
6.3 KiB
HTML
<!DOCTYPE html>
|
|
<html>
|
|
<head>
|
|
<meta charset="utf-8">
|
|
<meta name="viewport" content="width=device-width, initial-scale=1">
|
|
</head>
|
|
<body>
|
|
<!-- <script type="text/javascript" src="promifill.js"></script> -->
|
|
<script type="text/javascript">
|
|
const PENDING = 1;
|
|
const RESOLVED = 2;
|
|
const REJECTED = 3;
|
|
|
|
function noop() {};
|
|
|
|
function SyncPromise(fn) {
|
|
this._listeners = [];
|
|
this._value = null;
|
|
this._state = PENDING;
|
|
fn(this._resolve.bind(this), this._reject.bind(this));
|
|
}
|
|
|
|
SyncPromise.prototype = {
|
|
then: function(onResolved, onRejected) {
|
|
if (this._state === PENDING) {
|
|
this._listeners.push({onRejected: onRejected, onResolved: onResolved});
|
|
} else if (this._state === RESOLVED) {
|
|
onResolved(this._value);
|
|
} else if (this._state === REJECTED) {
|
|
onRejected(this._value);
|
|
}
|
|
return this;
|
|
},
|
|
catch: function(onRejected) {
|
|
return this.then(noop, onRejected);
|
|
},
|
|
finally: function(onResolved) {
|
|
return this.then(onResolved, noop);
|
|
},
|
|
_chain: function(value) {
|
|
if (value && typeof value.then === "function") {
|
|
value.then(function(value) {
|
|
self._resolve(value);
|
|
}, function(err) {
|
|
self._reject(err);
|
|
});
|
|
return true;
|
|
} else {
|
|
return false;
|
|
}
|
|
},
|
|
_resolve: function(value) {
|
|
if (!this._chain(value)) {
|
|
this._state = RESOLVED;
|
|
this._value = value;
|
|
for (var i = 0; i < this._listeners.length; i += 1) {
|
|
this._listeners[i].onResolved(value);
|
|
}
|
|
}
|
|
},
|
|
_reject: function(err) {
|
|
this._state = REJECTED;
|
|
this._value = err;
|
|
for (var i = 0; i < this._listeners.length; i += 1) {
|
|
this._listeners[i].onRejected(err);
|
|
}
|
|
}
|
|
}
|
|
|
|
SyncPromise.resolve = function(value) {
|
|
return new SyncPromise(function(resolve) {
|
|
resolve(value);
|
|
});
|
|
}
|
|
|
|
SyncPromise.reject = function(value) {
|
|
return new SyncPromise(function(_, reject) {
|
|
reject(value);
|
|
});
|
|
}
|
|
window.Promise = SyncPromise;
|
|
</script>
|
|
<!-- <script src="https://cdn.jsdelivr.net/npm/promise-polyfill@8/dist/polyfill.min.js"></script> -->
|
|
<script type="text/javascript">
|
|
function reqAsPromise(req) {
|
|
return new Promise(function (resolve, reject) {
|
|
req.onsuccess = function() {resolve(req);};
|
|
req.onerror = function(e) {reject(new Error("IDB request failed: " + e.target.error.message));};
|
|
});
|
|
}
|
|
|
|
function Storage(databaseName) {
|
|
this._databaseName = databaseName;
|
|
this._database = null;
|
|
}
|
|
|
|
Storage.prototype = {
|
|
open: function() {
|
|
const req = window.indexedDB.open(this._databaseName);
|
|
const self = this;
|
|
req.onupgradeneeded = function(ev) {
|
|
const db = ev.target.result;
|
|
const oldVersion = ev.oldVersion;
|
|
self._createStores(db, oldVersion);
|
|
};
|
|
return reqAsPromise(req).then(function() {
|
|
self._database = req.result;
|
|
});
|
|
},
|
|
openTxn: function(mode, storeName) {
|
|
const tx = this._database.transaction([storeName], mode);
|
|
const store = tx.objectStore(storeName);
|
|
return Promise.resolve(store);
|
|
},
|
|
_createStores: function(db) {
|
|
db.createObjectStore("foos", {keyPath: ["id"]});
|
|
}
|
|
};
|
|
|
|
function getAll(store) {
|
|
const request = store.openCursor();
|
|
const results = [];
|
|
return new Promise(function(resolve, reject) {
|
|
request.onsuccess = function(event) {
|
|
const cursor = event.target.result;
|
|
if(cursor) {
|
|
results.push(cursor.value);
|
|
cursor.continue();
|
|
} else {
|
|
resolve(results);
|
|
}
|
|
};
|
|
request.onerror = function(e) {reject(new Error("IDB request failed: " + e.target.error.message));};
|
|
});
|
|
}
|
|
|
|
function main() {
|
|
let storage = new Storage("idb-promises");
|
|
let store;
|
|
storage.open().then(function() {
|
|
return storage.openTxn("readwrite", "foos");
|
|
}).then(function(s) {
|
|
store = s;
|
|
store.clear();
|
|
store.add({id: 5, name: "foo"});
|
|
store.add({id: 6, name: "bar"});
|
|
return getAll(store);
|
|
}).then(function(all) {
|
|
console.log("all1", all);
|
|
store.add({id: 7, name: "bazzz"});
|
|
return getAll(store);
|
|
}).then(function(all) {
|
|
console.log("all2", all);
|
|
}).catch(function(err) {
|
|
console.error(err.message + ": " + err.stack);
|
|
});
|
|
}
|
|
main();
|
|
|
|
|
|
/*
|
|
|
|
we basically want something like this for IE11/Win7:
|
|
|
|
return new Promise(function (resolve, reject) {
|
|
req.onsuccess = function() {
|
|
resolve(req);
|
|
Promise?.flushQueue();
|
|
};
|
|
req.onerror = function(e) {
|
|
reject(new Error("IDB request failed: " + e.target.error.message));
|
|
Promise?.flushQueue();
|
|
};
|
|
});
|
|
|
|
we don't have this problem on platforms with a native promise implementation, so we can just have our own (forked) promise polyfill?
|
|
*/
|
|
</script>
|
|
</body>
|
|
</html>
|
|
|