jeena/en.javascript.info
1
0
Fork 0
Code Issues Pull requests Projects Packages Wiki Activity Actions

Fixed onupgradeneeded handling

Browse source 
`openRequest.result.version` in `onupgradeneeded` is not the current DB version. It is the requested version, equal to `event.newVersion`. `event.oldVersion` contains the current version.
This commit is contained in:
xehpuk 2020-06-15 17:24:39 +02:00 • committed by GitHub
parent a9925f4917
commit c13f21d65e
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
1 changed files with 3 additions and 3 deletions
Download patch file Download diff file Expand all files Collapse all files

6
6-data-storage/03-indexeddb/article.md
View file

@ -5,7 +5,7 @@ libs:
# IndexedDB # IndexedDB
IndexedDB is a database, that is built into browser, much more powerful than `localStorage`. IndexedDB is a database that is built into browser, much more powerful than `localStorage`.
- Stores almost any kind of values by keys, multiple key types. - Stores almost any kind of values by keys, multiple key types.
- Supports transactions for reliability. - Supports transactions for reliability.
@ -75,10 +75,10 @@ We can open it with version `2` and perform the upgrade like this:
```js ```js
let openRequest = indexedDB.open("store", *!*2*/!*); let openRequest = indexedDB.open("store", *!*2*/!*);
openRequest.onupgradeneeded = function() { openRequest.onupgradeneeded = function(event) {
// the existing database version is less than 2 (or it doesn't exist) // the existing database version is less than 2 (or it doesn't exist)
let db = openRequest.result; let db = openRequest.result;
switch(db.version) { // existing db version switch(event.oldVersion) { // existing db version
case 0: case 0:
// version 0 means that the client had no database // version 0 means that the client had no database
// perform initialization // perform initialization