I'm trying to use chrome storage in an extension, via a content_script, but I keep failing on
Uncaught TypeError: Cannot read property 'sync' of undefined
This is my code:
testChromeStorage();
function testChromeStorage() {
console.log("Saving");
chrome.storage.sync.set({'value': theValue}, function() {
message('Settings saved');
});
chrome.storage.sync.get("value", function (retVal) {
console.log("Got it? " + retVal.value);
});
}
You have to add the "storage" permission in your manifest.json file, i.e.:
...
"permissions": [
"storage"
],
...
For more information, see: https://developer.chrome.com/extensions/storage
Reload the Extension
I had the "permissions" key added in my manifest
file but still I struggled to get this fixed.
After adding the permission:-
"permissions": [
"storage"
]
Goto your extension using: chrome://extensions/ & click the Reload button:-
If someone was facing this issue on Firefox, please note, that it is not supported yet:
https://developer.mozilla.org/en-US/Add-ons/WebExtensions/API/storage#Chrome_incompatibilities
For my purposes it was sufficient to replace chrome.storage.sync
by chrome.storage.local
.
Regarding the Firefox implementation state it might be worth to look also here from time to time:
http://arewewebextensionsyet.com/#storage
See https://developer.chrome.com/extensions/content_scripts.html:
However, content scripts have some limitations. They cannot:
Use chrome. APIs (except for parts of chrome.extension)*
(emphasis added)