You cannot serialize file API object. Not that it helps with the specific problem, but … Although I haven’t used this, if you look at the article it seems that there are ways (although not supported yet by most browsers) to store the offline image data to some files so as to restore them afterward … Read more
There are a few steps you need to take to properly store this information in your localStorage. Before we get down to the code however, please note that localStorage (at the current time) cannot hold any data type except for strings. You will need to serialize the array for storage and then parse it back … 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
Extensions can use a database: IndexedDB (the sample code may look convoluted, but it’s pretty simple in the actual extensions, for example two small functions here, getStyles and saveStyle, or IDB-keyval wrapper library). If you want to use chrome.storage, just maintain a global queue array that is populated by the server listener: queue.push(newItem); updateStorage(); and … Read more
Here’s a crash crash course I found very useful. It explains a bunch of HTML5 concepts, including localStorage, video tag, offline websites, forms, locations, canvas, and more. http://diveintohtml5.org/storage.html
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.
localStorage and sessionStorage are both so-called WebStorages and features of HTML5. localStorage stores information as long as the user does not delete them. sessionStorage stores information as long as the session goes. Usually until the user closes the tab/browser. cookies are simply cookies, which are supported by older browsers and usually are a fallback for … Read more
Data/Parameters manipulation between page transitions It is possible to send a parameter/s from one page to another during page transition. It can be done in few ways. Reference: https://stackoverflow.com/a/13932240/1848600 Solution 1: You can pass values with changePage: $.mobile.changePage(‘page2.html’, { dataUrl : “page2.html?paremeter=123”, data : { ‘paremeter’ : ‘123’ }, reloadPage : true, changeHash : true … Read more
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