Html5 表单的LocalStorage
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html5表单的数据存储
Html5 提供localStorage方法在客户端存储数据;
优点:没有时间限制的数据(存储一年之后,数据依然可用);
实现:用javascript来存储和访问数据
例子(来自《Head First Html5》):
该要:生成一个表单(form),实现添加歌曲与Web存储加载;
基本用法解析:
1.获取localStorage的长度:localStorage.length
2.添加/编辑localStorage的内容:localStorage.setItem(键,值);
3.根据对应的索引去获取对应:localStorage的key的值:localStorage.key(索引);
4.根据对应的key获取对应的:localStorage.getItem(key);
5.删除数据:localStorage.removeItem(key);
1、建立一个播放列表的表单(index.html)
//index.html
<!doctype html>
<html lang = "en">
<head>
<title>Webville Tunes</title>
<meta charset="utf-8">
<script src="playlist_store.js"></script>
<script src="playlist.js"></script>
<link rel="stylesheet" href="playlist.css">
</head>
<body>
<form>
<input type="text" id="songTextInput" size="40" placeholder="Song name">
<input type="button" id="addButton" value="Add Song">
</form>
<ul id="playlist">
</ul>
</body>
</html>
2、Button的事件响应(playlist.js)
//playlist.js
window.onload = init;
function init()
var button = document.getElementById("addButton");
button.onclick = handleButtonClick;
loadPlaylist();
function handleButtonClick()
var textInput = document.getElementById("songTextInput");
var songName = textInput.value;
if (songName == "")
alert("Please enter a song");
else
var li = document.createElement("li");
li.innerHTML = songName;
var ul = document.getElementById("playlist");
ul.appendChild(li);
save(songName);
3、播放列表的存储与加载(playlist_store.js)
//playlist_store.js
//保存播放列表
function save(item)
var playlistArray = getStoreArray("playlist");
playlistArray.push(item);
localStorage.setItem("playlist", JSON.stringify(playlistArray));
//加载本地的播放列表playlist
function loadPlaylist()
var playlistArray = getSavedSongs();
var ul = document.getElementById("playlist");
if (playlistArray != null)
for (var i = 0; i < playlistArray.length; i++)
var li = document.createElement("li");
li.innerHTML = playlistArray[i];
ul.appendChild(li);
//获取被保存的歌曲
function getSavedSongs()
return getStoreArray("playlist");
//创建数组
function getStoreArray(key)
var playlistArray = localStorage.getItem(key);
if (playlistArray == null || playlistArray == "")
playlistArray = new Array();
else
playlistArray = JSON.parse(playlistArray);
return playlistArray;
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