indexeddb

How to Explicitly Request End User to Not Remove Local Storage Data?

由 别等时光非礼了梦想. 提交于 2020-01-11 10:08:07
问题 I am developing application using angularJS. my application require to save data locally. So, I am using HTML5 local storage. The issue with HTML5 local storage is that when user clears browsing data all the data is being lost and we need this to be avoided. I realize that since the data is stored on the users computer, there is no way to 100% secure the data. Essentially, is there a way to explicitly tell the browser that this data is special and should not be cleared when data from other

3.1.1 HTML5存储

由 主宰稳场 提交于 2020-01-06 14:41:57
一.介绍 二.HTML5本地存储 （一）.Localstorage （二）.API （三）.存储时效 （四）.indexDB （五）.indexDB-索引 （六）.indexDB-游标 三.游标索引结合与区别 （一）.IndexDB-游标索引结合 （二）.indexDB-区别 四.课程总结 (一）介绍 1. 本地存储 ： (1) .web storage (2) .IndexedDB 2. 本地存储的扩展介绍。 3. 离线存储-app cache。 4. 分析存储需求 ： ( 1 ). 照顾2g，3g网络的体验。 ( 2 ). 流量节省。 ( 3 ). 在离线情况下使用。 cookie做不到，cookie的局限性：存储大小限制，仅4kb。单个域名下的数量限制，50个左右。污染请求头，浪费流量。 二．HTML5本地存储 （一）Localstorage localStorage和sessionStorage 1. 本地存储和离线存储相同的使用方法： ( 1 ). setItem方法设置存储内容。localStorage.setItem('Key', 'Value'); ( 2 ). getItem方法获取存储内容。localStorage.getItem('Key');//返回value值。 ( 3 ). 使用removeItem方法删除存储内容。(一个一个删)

YDN-DB How to verify if a record exists?

由 ╄→尐↘猪︶ㄣ 提交于 2020-01-05 09:05:26
问题 I'm trying to verify if a specific record exist inside a table by a given ID. For example: var id = 23; db.count('products',id).done(function(count) { if(count>0){ db.get('products',id).done(function(r) { //Do something }); }else{ alert('No product found'); } }); When I try this, I get the following error: uncaught exception: null I'd really appreciate your help Thanks!. 回答1: Your solution is almost correct. In IndexedDB API, there is no exists method, probably because it can be emulated

how can one distinguish JS Opaque Objects?

由 风流意气都作罢 提交于 2020-01-04 08:21:26
问题 The WebCrypto API introduces the notion of non exportable private keys, which can be exported to IndexDB but not not LocalStorage or over the web. This is nicely explained in Charles Engleke's blog "Saving Cryptographic Keys in the Browser". But how do these objects actually work? Is there a way to tell from JS if an object is opaque or not? I am having trouble finding any information on this. 回答1: There isn't a magical "opaque flag" anywhere. "Opaque" here just means there is data held in

Firebase and app-indexeddb-mirror integration not working

由 旧时模样 提交于 2020-01-02 20:19:08
问题 I'm trying to integrate Firebase with app-indexeddb-mirror element to cache user data and deliver it when he's offline. I ceated an element that should list the name of all users in my firebase database even when I'm offline. <link rel="import" href="../bower_components/polymer/polymer.html"> <link rel="import" href="../bower_components/polymerfire/polymerfire.html"> <link rel="import" href="../bower_components/app-storage/app-indexeddb-mirror/app-indexeddb-mirror.html"> <dom-module id=

How to set initialState in @ngrx/core with a promise from indexedDB

由 那年仲夏 提交于 2020-01-02 18:04:31
问题 I wanted to set the initial state in ngrx using the idb package which uses promise to fetch data, but am getting an error every time I tried to set it up. I read that @ngrx is synchronous does that mean it does not work with promises. The different methods I tried: this is my wrapper method for idb that loads in the data it works fine export function getInitialState(): Promise<any> { return StorageService.dB.loadInitialState('app-state'); } and the different methods I tried set the initial

IndexedDb transaction auto-commit behavior in edge cases

由 微笑、不失礼 提交于 2020-01-02 16:22:13
问题 Tx is committed when : request success callback returns - that means that multiple requests can be executed within transaction boundaries only when next request is executed from success callback of the previous one when your task returns to event loop It means that if no requests are submitted to it, it is not committed until it returns to event loop. These facts pose 2 problematic states : placing a new IDB request by enqueuing a new task to event loop queue from within the success callback

IndexedDb transaction auto-commit behavior in edge cases

由 ⅰ亾dé卋堺 提交于 2020-01-02 16:22:12
问题 Tx is committed when : request success callback returns - that means that multiple requests can be executed within transaction boundaries only when next request is executed from success callback of the previous one when your task returns to event loop It means that if no requests are submitted to it, it is not committed until it returns to event loop. These facts pose 2 problematic states : placing a new IDB request by enqueuing a new task to event loop queue from within the success callback

get indexedDb quota storage information

由 孤街浪徒 提交于 2020-01-02 05:40:14
问题 I have tried below code to get indexedDb quota storage information navigator.webkitTemporaryStorage.queryUsageAndQuota ( function(usedBytes, grantedBytes) { console.log('we are using ', usedBytes, ' of ', grantedBytes, 'bytes'); }, function(e) { console.log('Error', e); } ); It is not working and giving the following error. Property 'webkitTemporaryStorage' does not exist on type 'Navigator'. Can anyone provide solution for getting indexedDb quota storage information in typescript? 回答1: The

Cross browser HTML5 storage library [closed]

由 时光总嘲笑我的痴心妄想 提交于 2020-01-01 09:55:54
问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 5 years ago . I have one requirement where should be stored locally when internet is not available. It should handle it in cross browser compatible way. Now as I know there are variety of options to store the data locally (indexedDB, WebSQL, localStorage). All I really want is a unified API. I don't want to detect and write
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