I think you’ve mistaken localStorage for the new Chrome Storage API. – You needed JSON strings in case of the localStorage – You can store objects/arrays directly with the new Storage API // by passing an object you can define default values e.g.: [] chrome.storage.local.get({userKeyIds: []}, function (result) { // the input argument is ALWAYS … Read more
Yes, it is thread safe. However, your code isn’t atomic and that’s your problem there. I’ll get to thread safety of localStorage but first, how to fix your problem. Both tabs can pass the if check together and write to the item overwriting each other. The correct way to handle this problem is using StorageEvents. … Read more
Our users were having issues with web sites using the LocalStorage feature (including Twitter) on Windows 8 with IE 10. When accessing one of these sites with the F12 Developer Tools open, a SCRIPT5: Access is denied message appeared on the console. After working with Microsoft support, we identified the cause. It turned out to … Read more
Yeah, IE9 doesn’t support localStorage for local files. Not in any official documentation that I can find, but the same issue is described in this blog. You’ll have to either host the website externally, or find some other method of persisting data. [Support for HTML5-style local storage is still in beta in many browsers, anyway. … Read more
Since JS is dynamical language just rewrite original functions. var originalSetItem = localStorage.setItem; localStorage.setItem = function(){ document.createEvent(‘Event’).initEvent(‘itemInserted’, true, true); originalSetItem.apply(this, arguments); }
I happen to know something about this 😉 There’s no API for requesting an increase in storage size for an existing database. There is one way to force an increase: write data to the database in such a size that an increase is required, prompting the user. However, this would be slow and there’s no … Read more
If it’s so small you should probably store the UI settings json object in your own database. That will leave users with less problems at their end, like cache clearance and local storage unsupported browsers. It will also make it possible for users to use the UI settings across different computers or browsers.
Functions in javascript are more than just their code. They also have scope. Code can be stringified, but scope cannot. JSON.stringify() will encode values that JSON supports. Objects with values that can be objects, arrays, strings, numbers and booleans. Anything else will be ignored or throw errors. Functions are not a supported entity in JSON. … Read more
Instead of deleting the key, just set it again with the new questions array: questions.splice(index, 1); localStorage.setItem(‘questions’, JSON.stringify(questions));
Something like this ? var img = new Image(); img.src=”https://stackoverflow.com/questions/19158887/mypicture.png”; img.load = function() { var canvas = document.createElement(‘canvas’); document.body.appendChild(canvas); var context = canvas.getContext(‘2d’); context.drawImage(img, 0, 0); var data = context.getImageData(x, y, img.width, img.height).data; localStorage.setItem(‘image’, data); // save image data }; Get the localStorage on the second page; try something like this: window.onload = function() { … Read more