How can I detect if Windows local storage is available?

Question

I was using the following code:

//if (Modernizr.localstorage) {
//    // window.localStorage is available!
//} else {
//    // document.location.href = '/Error/Message/OldBrowser';
//}

Is there some way that I can do the same thing without the overhead of using Modernizr?

Try here: http://stackoverflow.com/questions/4706347/javascript-comparing-2-checks-for-localstorage — Xyan Ewing, Aug 02 '12 at 12:41
Exactly how much overhead is Modernizr if you only include that one test? Anyway, you can just copy the test in the Modernizr source: https://github.com/Modernizr/Modernizr/blob/master/modernizr.js#L779 — millimoose, Aug 02 '12 at 12:42
I would rely on modernizr as it will deal with browser evolution. And it is so small in size that you may afford it. — unludo, Aug 02 '12 at 12:48
possible duplicate of [How to detect if browser supports HTML5 Local Storage](http://stackoverflow.com/questions/11214404/how-to-detect-if-browser-supports-html5-local-storage) — Felix Kling, Aug 02 '12 at 12:54

score 2 · Accepted Answer · answered Aug 02 '12 at 12:41

2

if (!!window.localStorage) {
   /* you have localstorage */
}

note: localstorage is natively available even on IE8

answered Aug 02 '12 at 12:41

Fabrizio Calderan

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Can you explain the significance of the !! Thanks – Alan2 Aug 02 '12 at 12:42
(!!) double not, it coerces the expression as a boolean – Fabrizio Calderan Aug 02 '12 at 12:43

score 1 · Answer 2 · answered Aug 02 '12 at 12:46

1

From DevProConnections magazine:

function supportStorage()
{
    return ('localStorage' in window) && window['localStorage'] != null;
}

answered Aug 02 '12 at 12:46

Steve Wellens

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How can I detect if Windows local storage is available?

2 Answers2

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