Generate random password string with requirements in javascript

Question

I want to generate a random string that has to have 5 letters from a-z and 3 numbers.

How can I do this with JavaScript?

I\'ve got the following script, but

Answer 1

This isn't exactly optimized, but it should work.

var chars = "ABCDEFGHIJKLMNOPQRSTUVWXTZabcdefghiklmnopqrstuvwxyz";
var string_length = 8;
var randomstring = '';
var charCount = 0;
var numCount = 0;

for (var i=0; i= 5) {
        var rnum = Math.floor(Math.random() * 10);
        randomstring += rnum;
        numCount += 1;
    } else {
        // If any of the above criteria fail, go ahead and generate an alpha character from the chars string
        var rnum = Math.floor(Math.random() * chars.length);
        randomstring += chars.substring(rnum,rnum+1);
        charCount += 1;
    }
}

alert(randomstring);

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Here's a jsfiddle for you to test on: http://jsfiddle.net/sJGW4/3/