ghostcode
7/28/2014 - 3:07 AM

textStorage.js

textStorage.js
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/**
 * @ NAME: Cross-browser TextStorage
 * @ DESC: text storage solution for your pages
 * @ COPY: sofish, http://sofish.de
 */
typeof window.localStorage == 'undefined' && ~function () {

    var localStorage = window.localStorage = {},
        prefix = 'data-userdata',
        doc = document,
        attrSrc = doc.body,

        // save attributeNames to <body>'s `data-userdata` attribute
        mark = function (key, isRemove, temp, reg) {

            attrSrc.load(prefix);
            temp = attrSrc.getAttribute(prefix) || '';
            reg = RegExp('\\b' + key + '\\b,?', 'i');

            var hasKey = reg.test(temp) ? 1 : 0;

            temp = isRemove ? temp.replace(reg, '') : hasKey ? temp : temp === '' ? key : temp.split(',').concat(key).join(',');

            alert(temp);

            attrSrc.setAttribute(prefix, temp);
            attrSrc.save(prefix);

        };

    // add IE behavior support
    attrSrc.addBehavior('#default#userData');

    localStorage.getItem = function (key) {
        attrSrc.load(key);
        return attrSrc.getAttribute(key);
    };

    localStorage.setItem = function (key, value) {
        attrSrc.setAttribute(key, value);
        attrSrc.save(key);
        mark(key);
    };

    localStorage.removeItem = function (key) {
        attrSrc.removeAttribute(key);
        attrSrc.save(key);
        mark(key, 1);
    };

    // clear all attributes on <body> tag that using for textStorage 
    // and clearing them from the 
    // 'data-userdata' attribute's value of <body> tag
    localStorage.clear = function () {

        attrSrc.load(prefix);

        var attrs = attrSrc.getAttribute(prefix).split(','),
            len = attrs.length;

        if (attrs[0] === '') return;

        for (var i = 0; i < len; i++) {
            attrSrc.removeAttribute(attrs[i]);
            attrSrc.save(attrs[i]);
        };

        attrSrc.setAttribute(prefix, '');
        attrSrc.save(prefix);

    };

}();