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Save narainsagar/5783e207b5abe065d362 to your computer and use it in GitHub Desktop.
Detect private browsing mode (InPrivate Browsing or Incognito).
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| function retry(isDone, next) { | |
| var current_trial = 0, max_retry = 50, interval = 10, is_timeout = false; | |
| var id = window.setInterval( | |
| function() { | |
| if (isDone()) { | |
| window.clearInterval(id); | |
| next(is_timeout); | |
| } | |
| if (current_trial++ > max_retry) { | |
| window.clearInterval(id); | |
| is_timeout = true; | |
| next(is_timeout); | |
| } | |
| }, | |
| 10 | |
| ); | |
| } | |
| function isIE10OrLater(user_agent) { | |
| var ua = user_agent.toLowerCase(); | |
| if (ua.indexOf('msie') === 0 && ua.indexOf('trident') === 0) { | |
| return false; | |
| } | |
| var match = /(?:msie|rv:)\s?([\d\.]+)/.exec(ua); | |
| if (match && parseInt(match[1], 10) >= 10) { | |
| return true; | |
| } | |
| return false; | |
| } | |
| function detectPrivateMode(callback) { | |
| var is_private; | |
| if (window.webkitRequestFileSystem) { | |
| window.webkitRequestFileSystem( | |
| window.TEMPORARY, 1, | |
| function() { | |
| is_private = false; | |
| }, | |
| function(e) { | |
| console.log(e); | |
| is_private = true; | |
| } | |
| ); | |
| } else if (window.indexedDB && /Firefox/.test(window.navigator.userAgent)) { | |
| var db; | |
| try { | |
| db = window.indexedDB.open('test'); | |
| } catch(e) { | |
| is_private = true; | |
| } | |
| if (typeof is_private === 'undefined') { | |
| retry( | |
| function isDone() { | |
| return db.readyState === 'done' ? true : false; | |
| }, | |
| function next(is_timeout) { | |
| if (!is_timeout) { | |
| is_private = db.result ? false : true; | |
| } | |
| } | |
| ); | |
| } | |
| } else if (isIE10OrLater(window.navigator.userAgent)) { | |
| is_private = false; | |
| try { | |
| if (!window.indexedDB) { | |
| is_private = true; | |
| } | |
| } catch (e) { | |
| is_private = true; | |
| } | |
| } else if (window.localStorage && /Safari/.test(window.navigator.userAgent)) { | |
| try { | |
| window.localStorage.setItem('test', 1); | |
| } catch(e) { | |
| is_private = true; | |
| } | |
| if (typeof is_private === 'undefined') { | |
| is_private = false; | |
| window.localStorage.removeItem('test'); | |
| } | |
| } | |
| retry( | |
| function isDone() { | |
| return typeof is_private !== 'undefined' ? true : false; | |
| }, | |
| function next(is_timeout) { | |
| callback(is_private); | |
| } | |
| ); | |
| } |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| </head> | |
| <body> | |
| <div id="result"></div> | |
| <script src="detect-private-browsing.js"></script> | |
| <script> | |
| detectPrivateMode( | |
| function(is_private) { | |
| document.getElementById('result').innerHTML = typeof is_private === 'undefined' ? 'cannot detect' : is_private ? 'private' : 'not private'; | |
| } | |
| ); | |
| </script> | |
| </body> | |
| </html> |
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