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Javascript Unique Random Number Generator

Article by:

Premshree Pillai (8/6/2002)

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Summary:

This JavaScript picks up a number of unique random elements from an array.

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This JavaScript picks a number of unique random elements from an array.

For example; if you have an array myArray consisting of 10 elements and want to pick 5 unique random elements. Suppose initially myArray[3] is picked randomly, then myArray[3] will not be picked again.

If you want to pick 4 numbers, call the function like this : pickNums(4)

Select All Code

<script language="JavaScript">
// Unique Random Numbers Picker
// -Picks a number of unique random numbers from an array
// (c) 2002 Premshree Pillai
// http://www.qiksearch.com, http://javascript.qik.cjb.net
// E-mail : qiksearch@rediffmail.com

var numArr = new Array("0","1","2","3","4","5","6","7","8","9"); // Add elements here
var pickArr = new Array(); // The array that will be formed
var count=0;
var doFlag=false;
var iterations=0;

function pickNums(nums)
{
 iterations+=1;
 var currNum = Math.round((numArr.length-1)*Math.random());
 if(count!=0)
 {
  for(var i=0; i<pickArr.length; i++)
  {
   if(numArr[currNum]==pickArr[i])
   {
    doFlag=true;
    break;
   }
  }
 }
 if(!doFlag)
 {
  pickArr[count]=numArr[currNum];
  document.write('<b>' + numArr[currNum] + ' <font color="#808080">| ');
  count+=1;
 }
 if(iterations<(numArr.length*3)) // Compare for max iterations you want
 {
  if((count<nums))
  {
   pickNums(nums);
  }
 }
 else
 {
  location.reload();
 }
}

pickNums(5); // Call the function, the argument is the number of elements you want to pick.
             // Here we pick 5 unique random numbers
</script>

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