Created
September 16, 2011 03:13
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Cross-browser TextStorage Solution
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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); | |
| }; | |
| }(); |
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I also use this behavior in general, but the approach is useless because IE userData is per folder. This restricts the url structure a lot. My workaround is to have a single Iframe that contains the userData. This way, I have a shared localStorage. The only drawback is that I have to rely on an iframe load event that will usually fire after the main page load event.