I am having this problem in Chrome, but in Firefox webextensions there is not problem. So I ask why?
I have this function in background script. I add breakpoint to line with storage.set . I restart addon and I can access all the data in MyNamespace.data… The addon prints notification that installation was successfull, but the log shows empty object when I try to get data.
MyNamespace.checkIfExists = function (item) {
if (chrome.runtime.lastError) {
MyNamespace.notify("check-fail");
console.log("error:" + chrome.runtime.lastError);
console.log(chrome.runtime.lastError);
} else {
if ( ! ( "initiated" in item ) )
{
console.log("I'm initiating .. item:");
console.log(item);
/* Insert new data object */
/* This saves default values into storage */
chrome.storage.local.set({
easy: MyNamespace.data.easy,
advanced: MyNamespace.data.advanced,
images: MyNamespace.data.images,
inspector:MyNamespace.data.inspector,
extractor:MyNamespace.data.extractor,
profiles: MyNamespace.data.profiles,
default_profiles: MyNamespace.data.default_profiles
},
() => {
if (chrome.runtime.lastError)
{
MyNamespace.notify("write-fail");
console.log("local.set Error: " + chrome.runtime.lastError); }
else
{
MyNamespace.notify("write-succeess");
chrome.storage.local.get( {initiated: undefined, easy:undefined},
(result) => {
if (typeof result === undefined )
MyNamespace.notify("write-fail");
console.log("found:");
console.log(result);
console.log("/end");
}
)
chrome.storage.local.set( {initiated:true} );
MyNamespace.initiated = true;
}
} );
}
else
MyNamespace.initiated = true;
}
};
Result in console:
I’m initiating … item:
namespace.js:125 Object {}
namespace.js:149 found:
namespace.js:150 Object {}
namespace.js:151 /end
No error in console. In Chrome the object is empty. In Firefox I see one object to be saved, one property to be undefined.
{
"applications": {
"gecko": {
"id": "some-options@mozilla.org",
"strict_min_version": "48.0a1"
}
},
"description": "An example options ui",
"homepage_url": "https://github.com/mdn/webextensions-examples/tree/master/favourite-colour",
"manifest_version": 2,
"name": "Favourite colour",
"version": "1.0",
"icons": {
"48": "icons/eye-icon-colored-48.png"
},
"options_ui": {
"page": "options.html",
"open_in_tab": true
},
"browser_action": {
"default_title": "Adapt page",
"browser_style": true,
"default_popup": "popup/settings.html",
"default_icon": {
"48": "icons/eye-icon-48.png"
}
},
"web_accessible_resources": [
"icons/hotkeys-icon-32.png"
],
"permissions": ["storage", "tabs", "activeTab", "notifications"],
"background": {
"page": "background_scripts/background_scripts_bug_fix.html"
},
"content_scripts": [
{
"matches": ["<all_urls>" ],
"run_at": "document_start",
"js": [
"content_scripts/jquery-3.0.0.js",
"content_scripts/namespace.js",
"content_scripts/easy.js",
"content_scripts/addListeners.js"
]
}
],
"commands": {
"easy": {
"suggested_key": {
"default": "Ctrl+Shift+U"
},
"description": ""
}
}
}
Edit:
I have added this listener to be fired when storage data are saved:
chrome.storage.onChanged.addListener(function(changes, namespace) {
for (key in changes) {
var storageChange = changes[key];
console.log('Storage key "%s" in namespace "%s" changed. ' +
'Old value was "%s", new value is "%s".',
key,
namespace,
storageChange.oldValue,
storageChange.newValue);
}
});
And I got this log:
Storage key "advanced" in namespace "local" changed. Old value was "Object", new value is "undefined".
namespace.js:241 Storage key "default_profiles" in namespace "local" changed. Old value was "Object", new value is "undefined".
namespace.js:241 Storage key "easy" in namespace "local" changed. Old value was "Object", new value is "undefined".
namespace.js:241 Storage key "extractor" in namespace "local" changed. Old value was "Object", new value is "undefined".
namespace.js:241 Storage key "images" in namespace "local" changed. Old value was "Object", new value is "undefined".
namespace.js:241 Storage key "initiated" in namespace "local" changed. Old value was "true", new value is "undefined".
namespace.js:241 Storage key "inspector" in namespace "local" changed. Old value was "Object", new value is "undefined".
namespace.js:241 Storage key "profiles" in namespace "local" changed. Old value was "Object", new value is "undefined".
namespace.js:124 I'm initiating .. item:
namespace.js:125 Object {}
namespace.js:241 Storage key "advanced" in namespace "local" changed. Old value was "undefined", new value is "Object".
namespace.js:241 Storage key "default_profiles" in namespace "local" changed. Old value was "undefined", new value is "Object".
namespace.js:241 Storage key "easy" in namespace "local" changed. Old value was "undefined", new value is "Object".
namespace.js:241 Storage key "extractor" in namespace "local" changed. Old value was "undefined", new value is "Object".
namespace.js:241 Storage key "images" in namespace "local" changed. Old value was "undefined", new value is "Object".
namespace.js:241 Storage key "inspector" in namespace "local" changed. Old value was "undefined", new value is "Object".
namespace.js:241 Storage key "profiles" in namespace "local" changed. Old value was "undefined", new value is "Object".
namespace.js:152 found:
namespace.js:153 Object {}
namespace.js:154 /end
namespace.js:241 Storage key "initiated" in namespace "local" changed. Old value was "undefined", new value is "true".
So what does this mean? I see word Object() in Chrome, white letters (Dark Theme) but it is not like link where I could click and see the object. This shows the data are loaded. But why I cannot watch the data in the Object?
- I cannot step into the callback so I cannot watch the data
- I cannot watch what is in the Object {} in Console… is looks like it is empty
- result in .get calback is empty … contains no properties
I have checked it with this code:
for (var key in result)
if (hasOwnProperty.call(result, key))
console.log(“key:” + key);
In Chrome no properties are listed, in Firefox Toolbox / Console they are listed.
As far as I understand the storage.set callback it should be fired after the save changes has been made and the db file is closed for write. So I expect that there shouldn’t be any problem in storage.get fired from inside storage.set