Question

I’m developing a webpage but I need a JS script which selects a random page from a directory. At the moment I have this script;

    <!-- Hide this script from old browsers --

var links = new Array(10) 
links[0] = "anal.html" 
links[1] = "brr-fail.htm" 
links[2] = "anal.html" 
links[3] = "brr-fail.htm" 
links[4] = "anal.html" 
links[5] = "brr-fail.htm" 
links[6] = "anal.html" 
links[7] = "brr-fail.htm" 
links[8] = "anal.html" 
links[9] = "brr-fail.htm" 
links[10] = "anal.html" 
function go() { 
var a = 1+Math.round(Math.random()*10) 
var i = a 
location = links[i] 
} 
// -- End Hiding Here -->

</script>

(Don’t worry, it isn’t gay porn – meme)

As you can see, it is kinda complicated, and sometimes it brings up an “undefined” page error. Is there any way to make it select a random page from the whole directory? Say something like;

http://www.urlhere.co.uk/memes/random/

Thanks guys

Answer 1

Math random produces a value between 0 and 1, if you multiply with 10, you get number from 0.0 to 9.9, and if you round that, you get number from 0 to 10. So you don’t need to add 1 to it, that would result in 11 in some cases, wich you don’t have, since the undefined. Simply use:

var a = Math.round(Math.random()*10); // {0-10}

Edit: corrected my wrong 1st answer

Note: actually would not result a standard distribution of random numbers, since 0 and 10 would only result if, Math.random() is 0.0 – 0.049… (0) and 0.95 – 0.99… (10) You can even the odds by this:

var a = Math.floor(Math.random()*11); // {0-10}

This way a whole decimal range (x.0-x.9) floored down.