Assigning a random value to a Varaible

[sstaubin01]

I've created an array with 5 occurrences. Before processing the array I want to set an index variable to a random value between 0 and 4. I want to do this so I don't always get the same banner starting from a Ad Rotator script when the page is refreshed. Any ideas how I can set the index variable to a random value?

[goober]

I believe you can use the Rnd() Function for numbers, but am unsure of it's exact syntax. You'd probably want to look it up on www.4GuysFromRolla.com or www.ASP101.com.

Hope this helps!

[sstaubin01]

Thanks Sean. I've used the following and it works fine.

<SCRIPT language="JavaScript"><!--
var maxNumber = 1000;
var randomNumber = Math.round(maxNumber * Math.random());
//--></SCRIPT>

I got it from Cnet at

http://www.builder.com/Programming/S...dir1.Stupid4_6

[goober]

Glad you found your answer!

Good luck in the future.

[Arielladog]

Hey guys,

Just as a note (not very important), but in JavaScript, when you create a random number, you should always "floor it" to create something truly random, rather than round it. Example:

<SCRIPT language="JavaScript"><!-- 
var maxNumber = 1000; 
var randomNumber = Math.floor(maxNumber * Math.random()); 
//--></SCRIPT>

Althought it might not make sense, it does. This thread explains it. Some people stubbornly told me that's better, but I couldn't figure out why...it was just accepted, but finally we got it:

http://javascriptcity.com/forums/sho...?threadid=2366

aDog