官术网_书友最值得收藏!

Time for action – loading the tasklist

We have the tasklist saved. But that doesn't do us much good if we can't load it. So let's add a new private method called loadTaskList():

function loadTaskList()
{
    var tasks = appStorage.getObject("taskList");
    if (tasks)
    {
        for (var i in tasks)
        {
            addTaskElement(tasks[i]);
        }
    }
}

This method calls appStorage.getValue() passing in the key for our tasklist. Then it checks to make sure we got something back. If so, it iterates over all of the tasks in the array calling the addTaskElement() method for each one.

The only thing left to do is add a call to loadTaskList() from the start() method, so the list is loaded when the application starts:

this.start = function()
{
    // Code not shown…
    loadTaskList();
    setStatus("ready");
};

What just happened?

We used the AppStorage object in our tasklist application to store the tasklist to localStorage any time something changes, and then retrieve it and build the tasklist when the user returns.

Have a go hero

Write a local storage browser application that can be used to look at the data for each application in your domain. At the top level, list all of the applications. When you drill down into the application, it shows all of its local storage items. When you click an item, it shows the contents of that item.

Pop quiz

Q1. What are the three basic components of an HTML5 application?

  1. jQuery, templates, and local storage
  2. Document, object, and model
  3. Tags, elements, and attributes
  4. HTML, CSS, and JavaScript

Q2. What type of data can be stored in local storage?

  1. Any type
  2. Objects
  3. Numbers
  4. Strings
主站蜘蛛池模板: 浙江省| 星子县| 龙里县| 吴忠市| 长阳| 绥江县| 岑溪市| 安仁县| 滁州市| 双江| 万宁市| 阿荣旗| 连平县| 平定县| 高要市| 额敏县| 旌德县| 故城县| 洪雅县| 洛扎县| 白城市| 沐川县| 观塘区| 鞍山市| 禹城市| 勐海县| 杨浦区| 惠东县| 宁远县| 会东县| 连南| 微博| 曲周县| 绥棱县| 甘孜县| 南华县| 公安县| 昌平区| 时尚| 平山县| 商南县|