Using AngularJS how could I randomize the order of a collection?
EDIT Warning!: These results are skewed, don't use this. This answer is only left as a warning until further editing.
Explanation: There should be an equal chance of any item being in the first position, but the actual percent chance after 10,000 iterations of, for example, 6 items, ends up being
1: ~28%, 2: ~10%, 3: ~14%, 4: ~20%, 5: ~12%, 6: ~15%
orderBy
can take a function parameter, just like array.sort
so you can use your HTML above and define a function random
on the scope like:
$scope.random = function(){ return 0.5 - Math.random();};
This will return a random value sometimes negative, sometimes positive, sometimes 0, which will randomly sort the array.
Doing a quick fiddle sh0ber method seems to work well:http://jsfiddle.net/owenmead/fa4v8/1/
<div ng-controller="MyCtrl"> <p ng-repeat="i in list|orderBy:random">{{i}}</p></div>function MyCtrl($scope) { $scope.list = ['a', 'b', 'c', 'd', 'e', 'f', 'g']; $scope.random = function() { return 0.5 - Math.random(); }}
Angular's orderBy uses JavaScript's sort() on a copy of the list. Looking at another answer, certain browsers are stable in their sort, others are not. Perhaps just test the fiddle in a few browsers and you should be good to go:Array.sort Sorting Stability in Different Browsers
PS. Couldn't comment on sh0ber's answer as I don't have 50 rep