使用jquery读取html5 localstorage的值的方法

在HTML 5中，localstorage是个不错的东西，在支持localstorage的浏览器中， 能持久化用户表单的输入，即使关掉浏览器，下次重新打开浏览器访问，也能读出其值， 下面给出的例子是使用jquery 在每次表单加载的时候，读localstorage的值，而在表单每次提交时则清楚其值的例子
首先是一个表单：


代码如下:

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>HTML5 Local Storage Example</title>
<!-- include Bootstrap CSS for layout -->
<link href="//netdna.bootstrapcdn.com/twitter-bootstrap/2.2.1/css/bootstrap-combined.min.css" rel="stylesheet">
</head>
<body>
<div class="container">
<h1>HTML5 Local Storage Example</h1>
<form method="post" class="form-horizontal">
<fieldset>
<legend>Enquiry Form</legend>
<div class="control-group">
<label class="control-label" for="type">Type of enquiry</label>
<div class="controls">
<select name="type" id="type">
<option value="">Please select</option>
<option value="general">General</option>
<option value="sales">Sales</option>
<option value="support">Support</option>
</select>
</div>
</div>
<div class="control-group">
<label class="control-label" for="name">Name</label>
<div class="controls">
<input class="input-xlarge" type="text" name="name" id="name" value="" maxlength="50">
</div>
</div>
<div class="control-group">
<label class="control-label" for="email">Email Address</label>
<div class="controls">
<input class="input-xlarge" type="text" name="email" id="email" value="" maxlength="150">
</div>
</div>
<div class="control-group">
<label class="control-label" for="message">Message</label>
<div class="controls">
<textarea class="input-xlarge" name="message" id="message"></textarea>
</div>
</div>
<div class="control-group">
<div class="controls">
<label class="checkbox">
<input name="subscribe" id="subscribe" type="checkbox">
Subscribe to our newsletter
</label>
</div>
</div>
</fieldset>
<div class="form-actions">
<input type="submit" name="submit" id="submit" value="Send" class="btn btn-primary">
</div>
</form>
</div>

然后是js部分代码：


代码如下:

<script src="https://code.jquery.com/jquery-latest.js"></script>
<script>
$(document).ready(function () {
/*
* 判断是否支持localstorage
*/
if (localStorage) {
/*
* 读出localstorage中的值
*/
if (localStorage.type) {
$("#type").find("option[value=" + localStorage.type + "]").attr("selected", true);
}
if (localStorage.name) {
$("#name").val(localStorage.name);
}
if (localStorage.email) {
$("#email").val(localStorage.email);
}
if (localStorage.message) {
$("#message").val(localStorage.message);
}
if (localStorage.subscribe === "checked") {
$("#subscribe").attr("checked", "checked");
}
/*
* 当表单中的值改变时,localstorage的值也改变
*/
$("input[type=text],select,textarea").change(function(){
$this = $(this);
localStorage[$this.attr("name")] = $this.val();
});
$("input[type=checkbox]").change(function(){
$this = $(this);
localStorage[$this.attr("name")] = $this.attr("checked");
});
$("form")
/*
* 如果表单提交，则调用clear方法
*/
.submit(function(){
localStorage.clear();
})
.change(function(){
console.log(localStorage);
});
}
});