Inserting large quantities in IndexedDB's objectstore blocks UI
google-chrome-extension, indexeddb, javascript
Solution
You're on the right track, but you're asking the browser to store 35,000 objects before it's had a chance to finish storing one. Here's code which asynchronously waits for one request to finish before starting the next (but using the same transaction):
openRequest = window.indexedDB.open("MyDatabase", 1);
openRequest.onerror = function(event) {
console.error(event);
};
openRequest.onsuccess = function (event) {
var db = openRequest.result;
db.onerror = function(event) {
// Generic error handler for all errors targeted at this database's requests
console.error(event.target);
window.alert("Database error: " + event.target.wePutrrorMessage || event.target.error.name || event.target.error || event.target.errorCode);
};
var transaction = db.transaction('item', "readwrite");
var itemStore = transaction.objectStore("item");
putNext();
function putNext() {
if (i<items.length) {
itemStore.put(items[i]).onsuccess = putNext;
++i;
} else { // complete
console.log('populate complete');
callback();
}
}
};
Problem
I want to save some ~35000 objects in my IndexedDB's objectstore. I am using below code to insert. ``` AddListings = function (x2j_list_new, callback) { var transaction = db.transaction(["listings"], IDBTransaction.READ_WRITE); var count = 0; transaction.oncomplete = function (event) { if (callback) { console.log('x2jShowListing Added ' + count + '/' + x2j_list_new.length); callback([count, x2j_list_new.length]); } }; transaction.onerror = function (e) { console.log("myError: ", e); if (callback) { callback(false); } }; var store = transaction.objectStore("listings"); $.each(x2j_list_new, function (index0, item0) { var request = store.put(item0); request.onsuccess = function (event) { count++; // event.target.result }; }); }); }; ``` The above code works fine, but looping and inserting over ~35000 objects makes the UI unresponsive for ~200 seconds. I thought maybe i can use WebWorkers, but IndexedDB is not available inside WebWorkers. I tried to find a way to bulk insert, couldn't find one. Any ideas of how to insert large quantities of objects without blocking the UI?