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【自分メモ】cookieの値を取得する。

特定のcookieの値をだけを取得したい場合。

var getCookieValue = function(key) {
    var val = document.cookie.match(new RegExp('(^|\\s)'+key+'=([^;]+)'));
    return !!val && unescape(val[2]);
};

alert(getCookieValue("COOKIE名"));

参考URL blog.manaten.net

cookies.jsを使用した場合。

参考URL developer.mozilla.org

 /*\
 |*|
 |*|  :: cookies.js ::
 |*|
 |*|  A complete cookies reader/writer framework with full unicode support.
 |*|
 |*|  https://developer.mozilla.org/en-US/docs/DOM/document.cookie
 |*|
 |*|  Syntaxes:
 |*|
 |*|  * docCookies.setItem(name, value[, end[, path[, domain[, secure]]]])
 |*|  * docCookies.getItem(name)
 |*|  * docCookies.removeItem(name[, path])
 |*|  * docCookies.hasItem(name)
 |*|  * docCookies.keys()
 |*|
 \*/

var docCookies = {
  getItem: function (sKey) {
    if (!sKey || !this.hasItem(sKey)) { return null; }
    return unescape(document.cookie.replace(new RegExp("(?:^|.*;\\s*)" + escape(sKey).replace(/[\-\.\+\*]/g, "\\$&") + "\\s*\\=\\s*((?:[^;](?!;))*[^;]?).*"), "$1"));
  },
  setItem: function (sKey, sValue, vEnd, sPath, sDomain, bSecure) {
    if (!sKey || /^(?:expires|max\-age|path|domain|secure)$/i.test(sKey)) { return; }
    var sExpires = "";
    if (vEnd) {
      switch (vEnd.constructor) {
        case Number:
          sExpires = vEnd === Infinity ? "; expires=Tue, 19 Jan 2038 03:14:07 GMT" : "; max-age=" + vEnd;
          break;
        case String:
          sExpires = "; expires=" + vEnd;
          break;
        case Date:
          sExpires = "; expires=" + vEnd.toGMTString();
          break;
      }
    }
    document.cookie = escape(sKey) + "=" + escape(sValue) + sExpires + (sDomain ? "; domain=" + sDomain : "") + (sPath ? "; path=" + sPath : "") + (bSecure ? "; secure" : "");
  },
  removeItem: function (sKey, sPath) {
    if (!sKey || !this.hasItem(sKey)) { return; }
    document.cookie = escape(sKey) + "=; expires=Thu, 01 Jan 1970 00:00:00 GMT" + (sPath ? "; path=" + sPath : "");
  },
  hasItem: function (sKey) {
    return (new RegExp("(?:^|;\\s*)" + escape(sKey).replace(/[\-\.\+\*]/g, "\\$&") + "\\s*\\=")).test(document.cookie);
  },
  keys: /* optional method: you can safely remove it! */ function () {
    var aKeys = document.cookie.replace(/((?:^|\s*;)[^\=]+)(?=;|$)|^\s*|\s*(?:\=[^;]*)?(?:\1|$)/g, "").split(/\s*(?:\=[^;]*)?;\s*/);
    for (var nIdx = 0; nIdx < aKeys.length; nIdx++) { aKeys[nIdx] = unescape(aKeys[nIdx]); }
    return aKeys;
  }
}


alert(docCookies.getItem("COOKIE名"));