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Fixed onupgradeneeded handling

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`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.
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xehpuk 2020-06-15 17:24:39 +02:00 • committed by GitHub
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commit c13f21d65e
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1 changed files with 3 additions and 3 deletions
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6
6-data-storage/03-indexeddb/article.md
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@ -5,7 +5,7 @@ libs:
# 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.
- Supports transactions for reliability.
@ -75,10 +75,10 @@ We can open it with version `2` and perform the upgrade like this:
```js
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)
let db = openRequest.result;
switch(db.version) { // existing db version
switch(event.oldVersion) { // existing db version
case 0:
// version 0 means that the client had no database
// perform initialization