web memorandum

<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.6.4/jquery.min.js"></script>
<script src="common/js/jquery.cookie.js"></script>
<script src="common/js/fontsize.js"></script>

jQuery(function($){
//変数にクッキー名を入れる
var history = $.cookie('fontSize');
//適用する箇所を指定。今回は部分的に#test内のpに
var elm = $('body');
//変数が空ならfontMを、空でなければクッキーに保存しておいたものを適用
if(!history){
elm.addClass('fontS');
$('#fontS').addClass('active');
}else{
elm.addClass(history);
$('#'+history).addClass('active');
}
//ボタンをクリックしたら実行
$('li','.mod_headerbox_size').click(function(){
//activeでないボタンだった場合のみ動作
if(!$(this).hasClass('active')){
//現在activeのついているclassを削除
$('.active').removeClass('active');
//クリックしたボタンをactive
$(this).addClass('active');
//クリックした要素のID名を変数にセット
var setFontSize = this.id;
//クッキーに変数を保存
$.cookie('fontSize', setFontSize);
//一度classを除去して、変数をclassとして追加
elm.removeClass().addClass(setFontSize);
}
});
});

/**
* Cookie plugin
*
* Copyright (c) 2006 Klaus Hartl (stilbuero.de)
* Dual licensed under the MIT and GPL licenses:
* http://www.opensource.org/licenses/mit-license.php
* http://www.gnu.org/licenses/gpl.html
*
*/

/**
* Create a cookie with the given name and value and other optional parameters.
*
* @example $.cookie('the_cookie', 'the_value');
* @desc Set the value of a cookie.
* @example $.cookie('the_cookie', 'the_value', { expires: 7, path: '/', domain: 'jquery.com', secure: true });
* @desc Create a cookie with all available options.
* @example $.cookie('the_cookie', 'the_value');
* @desc Create a session cookie.
* @example $.cookie('the_cookie', null);
* @desc Delete a cookie by passing null as value. Keep in mind that you have to use the same path and domain
* used when the cookie was set.
*
* @param String name The name of the cookie.
* @param String value The value of the cookie.
* @param Object options An object literal containing key/value pairs to provide optional cookie attributes.
* @option Number|Date expires Either an integer specifying the expiration date from now on in days or a Date object.
* If a negative value is specified (e.g. a date in the past), the cookie will be deleted.
* If set to null or omitted, the cookie will be a session cookie and will not be retained
* when the the browser exits.
* @option String path The value of the path atribute of the cookie (default: path of page that created the cookie).
* @option String domain The value of the domain attribute of the cookie (default: domain of page that created the cookie).
* @option Boolean secure If true, the secure attribute of the cookie will be set and the cookie transmission will
* require a secure protocol (like HTTPS).
* @type undefined
*
* @name $.cookie
* @cat Plugins/Cookie
* @author Klaus Hartl/klaus.hartl@stilbuero.de
*/

/**
* Get the value of a cookie with the given name.
*
* @example $.cookie('the_cookie');
* @desc Get the value of a cookie.
*
* @param String name The name of the cookie.
* @return The value of the cookie.
* @type String
*
* @name $.cookie
* @cat Plugins/Cookie
* @author Klaus Hartl/klaus.hartl@stilbuero.de
*/
jQuery.cookie = function(name, value, options) {
if (typeof value != 'undefined') { // name and value given, set cookie
options = options || {};
if (value === null) {
value = '';
options.expires = -1;
}
var expires = '';
if (options.expires && (typeof options.expires == 'number' || options.expires.toUTCString)) {
var date;
if (typeof options.expires == 'number') {
date = new Date();
date.setTime(date.getTime() + (options.expires * 24 * 60 * 60 * 1000));
} else {
date = options.expires;
}
expires = '; expires=' + date.toUTCString(); // use expires attribute, max-age is not supported by IE
}
// CAUTION: Needed to parenthesize options.path and options.domain
// in the following expressions, otherwise they evaluate to undefined
// in the packed version for some reason...
var path = options.path ? '; path=' + (options.path) : '';
var domain = options.domain ? '; domain=' + (options.domain) : '';
var secure = options.secure ? '; secure' : '';
document.cookie = [name, '=', encodeURIComponent(value), expires, path, domain, secure].join('');
} else { // only name given, get cookie
var cookieValue = null;
if (document.cookie && document.cookie != '') {
var cookies = document.cookie.split(';');
for (var i = 0; i < cookies.length; i++) {
var cookie = jQuery.trim(cookies[i]);
// Does this cookie string begin with the name we want?
if (cookie.substring(0, name.length + 1) == (name + '=')) {
cookieValue = decodeURIComponent(cookie.substring(name.length + 1));
break;
}
}
}
return cookieValue;
}
};

<div class="mod_headerbox_size">
<ul>
<li id="fontS"><span><img width="30" height="60" alt="小さいサイズ" src="common/img/size_s.jpg"></span></li>
<li id="fontM"><span><img width="30" height="60" alt="少し大きいサイズ" src="common/img/size_m.jpg"></span></li>
<li id="fontL"><span><img width="30" height="60" alt="大きいサイズ" src="common/img/size_b.jpg"></span></li>
</ul>
<!--mod_headerbox_size_end--></div>

/* fontsize
-----------------------------------------*/
.fontS { font-size: 75% }
.fontM { font-size: 85% }
.fontL { font-size: 95% }

/* mod_headerbox_size
-----------------------------------------*/
.mod_headerbox_size {
width: 90px;
position:relative;
overflow:hidden;
}
.mod_headerbox_size ul {
}
.mod_headerbox_size ul li {
float: left;
width:30px;
height: 30px;
overflow: hidden;
}
.mod_headerbox_size ul li span {
display: block;
cursor: pointer;
}
.mod_headerbox_size ul li.active span {
margin-top: -30px;
}
.mod_headerbox_size ul li span:hover{
margin-top:-30px;
}