SharedStorage: append() method
Limited availability
This feature is not Baseline because it does not work in some of the most widely-used browsers.
Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
The append() method of the SharedStorage interface appends a string to the value of an existing key-value pair in the current origin's shared storage.
Syntax
append(key, value)
Parameters
key-
A string representing the key of the key-value pair to which you want to append a value.
value-
A string that you want to append to the existing value of the key-value pair.
Note:
If the specified key isn't found in the shared storage, the append() operation is equivalent to set(), that is, a new key-value pair with the specified key is added to the shared storage.
Return value
A Promise that fulfills with undefined.
Exceptions
- The
Promiserejects with aTypeErrorif:- The appended entry was not successfully stored in the database due to shared storage not being available (for example it is disabled using a browser setting).
keyand/orvalueexceed the browser-defined maximum length.- The calling site does not have the Shared Storage API included in a successful privacy sandbox enrollment process.
- In the case of
WorkletSharedStorage, thePromiserejects with aTypeErrorif the worklet module has not been added withSharedStorageWorklet.addModule().
Note:
In the case of WindowSharedStorage, if the append() operation doesn't successfully write to the database for a reason other than shared storage not being available, no error is thrown — the operation still fulfills with undefined.
Examples
window.sharedStorage
.append("integer-list", ",9")
.then(() => console.log("Value appended to integer list"));
Specifications
| Specification |
|---|
| Shared Storage API # dom-sharedstorage-append |
Browser compatibility
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