How to clear an angularJS array

Question

 $scope.itemarray = ['A', 'B', 'C'];

this will clear the array but the ui wont be updated.

$scope.itemarray = [];

this works fine! why?

 $scope.itemarray.length = 0;

Do you have some sort of ng-submit happening before your clear event perhaps? Maybe you're adding to the array somehow then trying to clear it. Otherwise = [] should be working fine — Mark Pieszak - Trilon.io
– Mark Pieszak - Trilon.io, Commented Apr 22, 2015 at 16:10
You may be doing something like the following: jsfiddle.net/9mth0knf (goes along with Petr Averyanov's answer) — Chris
– Chris, Commented Apr 22, 2015 at 16:33

torox · Accepted Answer · 2015-04-22 17:24:57Z

89

$scope.itemarray.length = 0; << this is correct. Length is read-write property.

$scope.itemarray = []; << this creates new empty array. If you have bindings to old itemarray, they may be lost. (Html binding like ng-if="itemarray[0]" wont be lost)

edited Apr 22, 2015 at 17:24

torox

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answered Apr 22, 2015 at 16:15

Petr Averyanov

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Enzey Over a year ago

Being able to set the length on an array is bizarre but it is also the absolute fastest way to clear an array in JavaScript

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