javascript - How to shuffle a NodeList - Stack Overflow

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Let's say I have a Nodelist:

list = document.querySelectorAll('div');

and I want to shuffle it. How would I do this?

The only answer I came across, here suggests turning the nodelist into an array using

var arr = [].concat(x);

Similarly, the MDN suggests the following (to turn a NodeList into an array):

var turnObjToArray = function(obj) {
  return [].map.call(obj, function(element) {
    return element;
  })
};

My question is, is there no way to do this without turning a NodeList into an array?

And, which of the above two methods is better?

And, once you have turned a NodeList into an array, does anything change when you operate on certain members of the array? (I.e. does deleting one node from the array delete it from the NodeList)?

Let's say I have a Nodelist:

list = document.querySelectorAll('div');

and I want to shuffle it. How would I do this?

The only answer I came across, here suggests turning the nodelist into an array using

var arr = [].concat(x);

Similarly, the MDN suggests the following (to turn a NodeList into an array):

var turnObjToArray = function(obj) {
  return [].map.call(obj, function(element) {
    return element;
  })
};

My question is, is there no way to do this without turning a NodeList into an array?

And, which of the above two methods is better?

And, once you have turned a NodeList into an array, does anything change when you operate on certain members of the array? (I.e. does deleting one node from the array delete it from the NodeList)?

• javascript
• arrays
• nodelist

Share Improve this question Follow edited Aug 3, 2017 at 19:14 Startec asked Aug 7, 2014 at 6:43 StartecStartec 13.3k2828 gold badges110110 silver badges170170 bronze badges

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2 Answers 2

Sorted by: Reset to default 5

If you need to change the order of elements in-place this may help you

var list = document.querySelector('div'), i;
for (i = list.children.length; i >= 0; i--) {
    list.appendChild(list.children[Math.random() * i | 0]);
}

Working jsBin

Side note: concat() in general is slower

A modern alternative might be to use the CSS Grid or Flexbox Order attribute. The advantage to this approach is that it can be undone by simply removing the style.

    var Scramble = function(){
        [].slice.call( document.querySelectorAll(".myClass") ).filter( function( _e ){
            _e.style.order =  (Math.floor(Math.random() * (10) + 1));
        } );
    }

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