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Ilya Kantor 2019-06-06 00:04:41 +03:00
parent 2009009f1f
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6-data-storage/02-localstorage/article.md
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@ -42,9 +42,9 @@ localStorage.setItem('test', 1);
alert( localStorage.getItem('test') ); // 1 alert( localStorage.getItem('test') ); // 1
``` ```
We only have to be on the same domain/port/protocol, the url path can be different. We only have to be on the same origin (domain/port/protocol), the url path can be different.
The `localStorage` is shared, so if we set the data in one window, the change becomes visible in the other one. The `localStorage` is shared between all windows with the same origin, so if we set the data in one window, the change becomes visible in another one.
## Object-like access ## Object-like access
@ -73,7 +73,7 @@ That's allowed for historical reasons, and mostly works, but generally not recom
## Looping over keys ## Looping over keys
As we've seen, the methods provide get/set/remove functionality. But how to get all saved values or keys? As we've seen, the methods provide "get/set/remove by key" functionality. But how to get all saved values or keys?
Unfortunately, storage objects are not iterable. Unfortunately, storage objects are not iterable.
@ -198,7 +198,7 @@ Imagine, you have two windows with the same site in each. So `localStorage` is s
You might want to open this page in two browser windows to test the code below. You might want to open this page in two browser windows to test the code below.
``` ```
Now if both windows are listening for `window.onstorage`, then each one will react on updates that happened in the other one. If both windows are listening for `window.onstorage`, then each one will react on updates that happened in the other one.
```js run ```js run
// triggers on updates made to the same storage from other documents // triggers on updates made to the same storage from other documents
@ -229,7 +229,7 @@ Web storage objects `localStorage` and `sessionStorage` allow to store key/value
| `localStorage` | `sessionStorage` | | `localStorage` | `sessionStorage` |
|----------------|------------------| |----------------|------------------|
| Shared between all tabs and windows with the same origin | Visible within a browser tab, including iframes from the same origin | | Shared between all tabs and windows with the same origin | Visible within a browser tab, including iframes from the same origin |
| Survives browser restart | Dies on tab close | | Survives browser restart | Survives page refresh (but not tab close) |
API: API:
@ -237,10 +237,10 @@ API:
- `getItem(key)` -- get the value by key. - `getItem(key)` -- get the value by key.
- `removeItem(key)` -- remove the key with its value. - `removeItem(key)` -- remove the key with its value.
- `clear()` -- delete everything. - `clear()` -- delete everything.
- `key(index)` -- get the key on a given position. - `key(index)` -- get the key number `index`.
- `length` -- the number of stored items. - `length` -- the number of stored items.
- Use `Object.keys` to get all keys. - Use `Object.keys` to get all keys.
- Can use the keys as object properties, in that case `storage` event isn't triggered. - We access keys as object properties, in that case `storage` event isn't triggered.
Storage event: Storage event: