前端框架,dojo离线缓存
上一篇文章我们讲述了dojo的基本知识和基本的模块,这一次,由小西带给大家dojo的离线缓存讲解。详细开讲之前,先说几句题外话,英语不好,是硬伤,大家一定不能荒废英语啊。
由于dojo的版本更新,旧的存储和缓存模块都被新的模块所替代,所以小西带给大家的是最新版本的方法,废话不多说,我们直接进入到正题:
目标:完成断网情况下本地存储,需要进行验证
参考博客文章:
http://dojotoolkit.org/reference-guide/1.7/dojo/json.html
http://dojotoolkit.org/reference-guide/1.9/dojo/store/Cache.html
http://dojotoolkit.org/reference-guide/1.9/dojo/store.html#dojo-store
http://dojotoolkit.org/reference-guide/1.9/dojo/store/JsonRest.html
http://www.jb51.cc/article/p-ndycdodh-zq.html
http://www.sitepen.com/blog/2008/09/23/effortless-offline-with-offlinerest/
服务器code就不给大家贴了,只是请求并返回一堆json数据,内容如下:
[{"id":"1","sex":"male","school":"SCU","age":"18","studentName":"mexiQQ1"},{"id":"2","sex":"female","school":"SDU","age":"19","studentName":"mexiQQ2"},{"id":"3","studentName":"mexiQQ3"}]
主要说一下我的页面如何编写,如何实现了dojo的离线缓存功能:
js引用的结构如下:
接下来,我直接贴出index.jsp的code:
<!DOCTYPE html> <html> <head> <Meta charset="utf-8"> <title>Tutorial: Hello Dojo!</title> </head> <body> <h1 id="greeting">Hello Dojo</h1> <h1 id="greeting_test">Hello localFrage</h1> <!-- load Dojo --> <script src="js/dojo/dojo.js" data-dojo-config="async: true"></script> <!-- load localFrage --> <script src="js/localForage/dist/localforage.js"></script> <script> function test_jsonRest_Cache(){ require([ 'dojo/store/JsonRest','dojo/store/Memory','dojo/store/Cache','dojo/store/Observable','dojo/json' ],function (JsonRest,Memory,Cache,Observable,json) { masterStore = new JsonRest({ target: "/TestServer/testServer",idAttribute: "studentName" }); cacheStore = new Memory(); inventoryStore = Cache(masterStore,cacheStore); inventoryStore.query().then(function(results){ alert(json.stringify(results)); }); }); } function test_localForage() { require(["dojo/request","localForage/dist/localforage",],function(request,localforage){ request("http://192.168.0.103:8080/TestServer/testServer").then(function(data){ alert(data); localforage.ready(function() { localforage.setItem('key',data,console.log); }); },function(err){ alert("It's wrong!!"); },function(evt){ alert("It's here!!"); }); }); } function test_get_from_localForage() { require(["localForage/dist/localforage"],function(localforage) { localforage.getItem('key',alert); }); } </script> <button onclick="test_jsonRest_Cache()">get_info_save_cache</button> <button onclick="test_localForage()">get_info_save_localFrage</button> <button onclick="test_get_from_localForage()">get_info_from_localFrage</button> </body> </html>
上述code中,我们不仅使用了dojo的离线缓存,同时验证了localFrage的离线存储,在接下来的博文中,小西也会带给大家。如果有问题,大家可发送邮件到lijianwei@139.me,我们一同交流学习。