web-storage

问题 I'm just starting to learn JSON and W3schools isn't very good at explaining what each line does. I can sort of figure out what some of them mean, but I'd like to figure it out completely. // Storing data: 1. myObj = {name: "John", age: 31, city: "New York"}; 2. myJSON = JSON.stringify(myObj); 3. localStorage.setItem("testJSON", myJSON); // Retrieving data: 4. text = localStorage.getItem("testJSON"); 5. obj = JSON.parse(text); 6. document.getElementById("demo").innerHTML = obj.name; So I know

问题 A few questions regard HTML5's sessionStorage: Does the 5MB limit on localStorage include sessionStorage? (ie. is it really a 5MB limit on the WebStorage API) If not does sessionStorage have a maximum size limit similar to localStorage? I found this site http://dev-test.nemikor.com/web-storage/support-test/ in another SO questions, I'm wondering if the data is still relevant? 回答1: Does the 5MB limit on localStorage include sessionStorage? (Answer: NO ) is it really a 5MB limit on the

问题 A few questions regard HTML5's sessionStorage: Does the 5MB limit on localStorage include sessionStorage? (ie. is it really a 5MB limit on the WebStorage API) If not does sessionStorage have a maximum size limit similar to localStorage? I found this site http://dev-test.nemikor.com/web-storage/support-test/ in another SO questions, I'm wondering if the data is still relevant? 回答1: Does the 5MB limit on localStorage include sessionStorage? (Answer: NO ) is it really a 5MB limit on the

问题 I am trying to save blob data (favicon) retrieved via AJAX, to localStorage . Code : var xhr = new XMLHttpRequest(); xhr.open('GET', 'http://g.etfv.co/http://www.google.com', true); xhr.responseType = "blob"; xhr.onload = function(e){ //Stringify blob... localStorage['icon'] = JSON.stringify(xhr.response); //reload the icon from storage var fr = new FileReader(); fr.onload = function(e) { document.getElementById("myicon").src = fr.result; } fr.readAsDataURL(JSON.parse(localStorage['icon']));

问题 I have indexedDb on my app for web storage. I would like to get the store form the below code. var store = myapp.indexedDB.db.transaction(['tree_nodes'],'readwrite').objectStore('tree_nodes'); It returns error. I was well known of opening indexeddb database and version changing. The error is Uncaught TypeError: Cannot call method 'transaction' of null I was tried it with the break point. In that case it works fine without errors. How can i get the store? please help me. Thanks in advance! 回答1

问题 I want to build an offline browser-based app using HTML and javascript to collect survey data on Android tablets. The app would consist of some static pages with forms for users to enter data, which would then be stored locally using Web Storage or IndexedDB. However, I also want to build a small native Android app which would grab this data and transfer it to other devices. Is this possible, and if so how would I go about it? Specifically, I want to understand if and how the native app would

问题 Hey i can't figure out why my code is not working. I've pulled out my hair please take a look and tell me what's wrong with this code Note : it's working fine in chrome and mozilla only not working in IE10 and all below versions of IE please note that am trying by two different ways so please don't confuse in that here is fiddle link http://jsfiddle.net/rEmn6/ here is my html code <div id="wrapper"> <div id="editable" contenteditable="true" onkeyup="SaveValue(this)"></div> <button onclick=

问题 I know localstorage is just a simple hash map with getItem and setItem. What if my Item is a JSON array and I would just like to add one item at the end of the array? Are there more efficient ways than calling setItem for just one more entry? 回答1: Unfortunately no. localStorage support only the string type so you will have to JSON.stringify the array before saving, which means you need to load it and parse it before you can add anything to it. You can write a simple wrapper to do this (can

问题 From what I've read of web storage in HTML5, there are a number of different storage options with varying support across different browsers. Are there any popular libraries for abstraction of web storage in HTML5 applications? 回答1: There are a couple of YUI-based libraries for abstracting the underlying storage away: YUI 2: Storage Utility YUI 3: Storage Lite You'd need to port them if you wanted to use them with another library, though it looks like someone has already done that for jQuery.

问题 I'm working on a webapp and I'm trying to access directories using the filesystem API. I need to request a quota from the user before accessing the directories according to specification. I should do something like this: ... navigator.webkitPersistentStorage.requestQuota(PERSISTENT, 1024*1024, function(gB){ window.requestFileSystem(PERSISTENT, gB, onInitFs, errorHandler); }, function(e){ console.log('Error', e); }) ... Everytime I do this I get a **TypeError: Type error** message. Please what