https://www.all-eyefulhomenavi.com/assets/js/js_cookie.js

1/**
2 * js_cookie.js
3 * 
4 * usage:
5 *   var cookie = new jsCookie('KEY', {
6 *     path   : '/',
7 *     secure : true
8 *   });
9 *   
10 *   cookie.write('value', 1);
11 * //cookie.write('value', ''); # ex.End of session
12 * 
13 *   var value = cookie.read();
14 * 
15 *   cookie.remove();
16 */
17'use strict';
18
19var jsCookie = function(key, options) {
20    this.vars = {
21        key : null,
22        options : {
23            path     : location.pathname.replace(/\/[^\/]*$/, '/'),
24            domain   : location.hostname,
25            expires  : '',
26            secure   : true,
27            httponly : ''
28        }
29    };
30    this.init(key, options);
31};
32
33jsCookie.prototype.init = function(key, options) {
34    // KEYとして利用できる文字は、英数字と _ - のみ
35    if (key == '' || ! key.match(/^[0-9a-zA-Z|_\-]+$/)) { return; }
36    this.vars.key = key;
37    // optionデフォルトの設定
38    this.vars.options = this.getOptions__(options);
39};
40// 引数があればそれを優先しつつ完全なoptionsを返す
41jsCookie.prototype.getOptions__ = function(options) {
42    if (! options) { options = {}; }
43    var opt = {};
44    for (var key in this.vars.options) {
45        if (options.hasOwnProperty(key)) {
46            opt[key] = options[key];
47        }
48        else if (this.vars.options.hasOwnProperty(key)) {
49            opt[key] = this.vars.options[key];
50        }
51    }
52    // expiresが数字の場合は n日後とする
53    if (typeof(opt.expires) === 'number') {
54        var day = opt.expires;
55        var expires_day = new Date();
56        expires_day.setDate(expires_day.getDate() + day);
57        opt.expires = expires_day;
58    }
59
60    return opt;
61};
62
63jsCookie.prototype.read = function() {
64    if (! this.vars.key) { return null; }
65    var value = this.parse__(this.vars.key);
66    return value;
67};
68jsCookie.prototype.parse__ = function(key) {
69    var cookies = document.cookie ? document.cookie.split('; ') : [];
70    for (var i in cookies) {
71        var parts = cookies[i].split('=');
72        if (parts[0] == encodeURIComponent(key)) {
73            var encoded_str = parts[1];
74            return decodeURIComponent(encoded_str);
75       }
76    }
77    return null;
78};
79
80jsCookie.prototype.write = function(value, expires_day, options) {
81    if (! this.vars.key) { return null; }
82    if (!options) { options = { expires : expires_day }; }
83    else { options.expires = expires_day; }
84    var opt = this.getOptions__(options);
85
86    var cookie_text = [
87        encodeURIComponent(this.vars.key), '=', encodeURIComponent(value),
88        opt.expires   ? '; Expires=' + opt.expires.toUTCString() : '',
89        opt.path      ? '; path='    + opt.path : '',
90        opt.domain    ? '; Domain='  + opt.domain : '',
91        opt.secure    ? '; Secure' : '',
92        opt.httponly  ? '; HttpOnly' : ''
93    ].join('');
94    console.log(cookie_text);
95    document.cookie = cookie_text;
96};
97
98jsCookie.prototype.remove = function(options) {
99    this.write('', -1, options);
100};