jQuery add class to 6 random elements with class

Question

I have 12 elements with class "block" and I need to add class "active" to 6 of 12 elements (randomly).

I think using for loop would to the trick but I am not sure how to do it. Maybe somebody can help me out?

for (var i = 0; i < 6; i++) {

    var random = Math.floor(Math.random() * 1000);
    block.eq(random % block.length).addClass("active");

}

This code adds class, but it's not 6 elements every time.. Need a solution to add "active" class to 6 elements every time. Now sometimes it's 6, sometime less..

xoomer, in the linked question you probably want the [answer by Alexander Wallin](https://stackoverflow.com/a/4786412/182660) rather than accepted one. — SergGr, Jun 04 '17 at 20:57
that's the price for it being reliable in selecting exactly half of all elements. — SergGr, Jun 04 '17 at 21:04

score -1 · Answer 1 · answered Jun 04 '17 at 20:54

-1

you can select all elements first and by random function chose any six of them and add class active to them

var elements = document.getElementsByName(elementname);

for(var i =0; i<6 ; i++)
 var random = Math.floor((Math.random() * 11) + 1);
 element[random].className += "active";

answered Jun 04 '17 at 20:54

Azeem112

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but how to do it using jquery? – xoomer Jun 04 '17 at 21:01
this code is logically the same as what OP has and it will **_not_** produce **_exactly_** 6 elements every time as `random` might get the same value on 2 different iterations – SergGr Jun 04 '17 at 21:06

jQuery add class to 6 random elements with class

1 Answers1