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Generate random string in JavaScript 

James
Joined:
02/21/2009
Posts:
130

May 23, 2009 19:46:01    Last update: May 23, 2009 19:49:46
This topic comes up once in a while: I need to generate a random string in JavaScript to get around browser (IE) cacheing.

  1. Method 1 (not really random, but a new value every millisecond): 
    function randomString() {
    return '' + new Date().getTime();
}


  2. Method 2 (generate a random alpha-numerical string): 
    function randomString(length) {
    var chars = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXTZabcdefghiklmnopqrstuvwxyz'.split('');
    
    if (! length) {
        length = Math.floor(Math.random() * chars.length);
    }
    
    var str = '';
    for (var i = 0; i < length; i++) {
        str += chars[Math.floor(Math.random() * chars.length)];
    }
    return str;
}

// generate a random string of random length
randomString();

// generate a random string of length 8
randomString(8);
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