How do I create a code for a website that will give a random non repeating number from 1-9999

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I want to set up a promotion where ppl get a unique referral number.
They can then send that referral number to friends to enter into a form(to track referrals)

I managed the random number generator but cannot make it exclusive.

What I have tried:

<!DOCTYPE html>
<html>
<body>

<p>Click to get your referral number</p>

<button onclick="myFunction()">Referal Number</button>

<p id="demo"></p>

<script>
function myFunction() {
    var x = document.getElementById("demo")
    x.innerHTML = Math.floor((Math.random() * 9999) + 1);
}
</script>

</body>
</html>

Posted 23-Apr-18 23:17pm

Member 13795362

Updated 24-Apr-18 2:18am

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CPallini · Answer 1 · 2018-04-23T23:45:00

Solution 1

Quote:
I managed the random number generator but cannot make it exclusive.

Use the algorithm described here: Random extraction of 5 cards from a deck[^].

Posted 23-Apr-18 23:45pm

CPallini

Comments

Maciej Los 24-Apr-18 5:46am

5ed!

CPallini 24-Apr-18 5:56am

Thank you! :-)

Maciej Los · Answer 2 · 2018-04-23T23:58:00

Seems you want to get unique random number every time you click on the button.
To able to achieve that, you have to get the list of numbers already randomized. Then you have to generate next random number, check if already exists, if not, then to "print" all numbers.

HTML

<!DOCTYPE html>
<html>
<body>

<p>Click to get your referral number</p>

<button onclick="myFunction()">Referal Number</button>

<p id="demo"></p>

<script>
var data = []; //or new Array();
function myFunction() {
    var x = document.getElementById("demo")
    var rnum = Math.floor((Math.random() * 9999) + 1);
    //here you have to check if ranodm number exists in data
    
    //finally you have to "print" it
    
}
</script>

</body>
</html>

Patrice T · Answer 3 · 2018-04-24T02:19:00

Quote:
How do I create a code for a website that will give a random non repeating number from 1-9999

This is the principle of random numbers, they can be repeated.

Quote:
I want to set up a promotion where ppl get a unique referral number.
They can then send that referral number to friends to enter into a form(to track referrals)

All the interest of a referral number is to give reward to your customers that send you new ones. In order to achieve this, you need to record the referral number in database in order to retrieve the referrer.
You can use any formula that give a unique number to each customer. Since each customer know only 1 referral number, how they are build does not really matter.
ex: start at 2000 and increment of 1: 2000, 2001, 2002, 2003 ...
ex: start at 10000 and increment of 7: 10000, 10007, 10014, 10021 ...

How do I create a code for a website that will give a random non repeating number from 1-9999

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