A simple AngularJS filter for summarizing the values of an array containing objects by a key.

example.html

<!-- $scope.myList = [{name: 'Foo', total: 1}, {name: 'Bar', total: 2}, {name: 'Baz', total: 3}] -->
<span class="badge badge-success pull-right">{{myList|sumByKey:'total'}}</span>

SumByKey.js

angular.module('caco.feed.filter', [])
    .filter('sumByKey', function() {
        return function(data, key) {
            if (typeof(data) === 'undefined' || typeof(key) === 'undefined') {
                return 0;
            }

            var sum = 0;
            for (var i = data.length - 1; i >= 0; i--) {
                sum += parseInt(data[i][key]);
            }

            return sum;
        };
    });

hello, thanks for this helpful filter.
But it seems like, it doesn't sum decimals for a floating value.
35.46 + 20.35 brings 55 instead of 55.81

I've improved it with support for objects instead of just arrays, and support for float values

https://gist.github.com/WindSaber/ae4c5d7ea689b36990b5545d1e4a91ac

Thanks!

I have a issue when key propierty don't exists and other times yes... so... I just add some like this:

if (data[i][key]) {
sum += parseInt(data[i][key]);
}

is there any textbox sum example with angularjs ng-repeat

Amazing man! thank you!

data ?

Amazing. Super.

Great Thank you,I have a problem,I have pagination with table.The sum is showing for each page,How can i get grand total instead of page wise torals