Calculating sum of repeated elements in AngularJS ng-repeat

Solution 1:

In Template

<td>Total: {{ getTotal() }}</td>

In Controller

$scope.getTotal = function(){
    var total = 0;
    for(var i = 0; i < $scope.cart.products.length; i++){
        var product = $scope.cart.products[i];
        total += (product.price * product.quantity);
    }
    return total;
}

Solution 2:

This is also working both the filter and normal list. The first thing to create a new filter for the sum of all values from the list, and also given solution for a sum of the total quantity. In details code check it fiddler link.

angular.module("sampleApp", [])
        .filter('sumOfValue', function () {
        return function (data, key) {        
            if (angular.isUndefined(data) || angular.isUndefined(key))
                return 0;        
            var sum = 0;        
            angular.forEach(data,function(value){
                sum = sum + parseInt(value[key], 10);
            });        
            return sum;
        }
    }).filter('totalSumPriceQty', function () {
        return function (data, key1, key2) {        
            if (angular.isUndefined(data) || angular.isUndefined(key1)  || angular.isUndefined(key2)) 
                return 0;        
            var sum = 0;
            angular.forEach(data,function(value){
                sum = sum + (parseInt(value[key1], 10) * parseInt(value[key2], 10));
            });
            return sum;
        }
    }).controller("sampleController", function ($scope) {
        $scope.items = [
          {"id": 1,"details": "test11","quantity": 2,"price": 100}, 
          {"id": 2,"details": "test12","quantity": 5,"price": 120}, 
          {"id": 3,"details": "test3","quantity": 6,"price": 170}, 
          {"id": 4,"details": "test4","quantity": 8,"price": 70}
        ];
    });


<div ng-app="sampleApp">
  <div ng-controller="sampleController">
    <div class="col-md-12 col-lg-12 col-sm-12 col-xsml-12">
      <label>Search</label>
      <input type="text" class="form-control" ng-model="searchFilter" />
    </div>
    <div class="col-md-12 col-lg-12 col-sm-12 col-xsml-12">
      <div class="col-md-2 col-lg-2 col-sm-2 col-xsml-2">
        <h4>Id</h4>

      </div>
      <div class="col-md-4 col-lg-4 col-sm-4 col-xsml-4">
        <h4>Details</h4>

      </div>
      <div class="col-md-2 col-lg-2 col-sm-2 col-xsml-2 text-right">
        <h4>Quantity</h4>

      </div>
      <div class="col-md-2 col-lg-2 col-sm-2 col-xsml-2 text-right">
        <h4>Price</h4>

      </div>
      <div class="col-md-2 col-lg-2 col-sm-2 col-xsml-2 text-right">
        <h4>Total</h4>

      </div>
      <div ng-repeat="item in resultValue=(items | filter:{'details':searchFilter})">
        <div class="col-md-2 col-lg-2 col-sm-2 col-xsml-2">{{item.id}}</div>
        <div class="col-md-4 col-lg-4 col-sm-4 col-xsml-4">{{item.details}}</div>
        <div class="col-md-2 col-lg-2 col-sm-2 col-xsml-2 text-right">{{item.quantity}}</div>
        <div class="col-md-2 col-lg-2 col-sm-2 col-xsml-2 text-right">{{item.price}}</div>
        <div class="col-md-2 col-lg-2 col-sm-2 col-xsml-2 text-right">{{item.quantity * item.price}}</div>
      </div>
      <div colspan='3' class="col-md-8 col-lg-8 col-sm-8 col-xsml-8 text-right">
        <h4>{{resultValue | sumOfValue:'quantity'}}</h4>

      </div>
      <div class="col-md-2 col-lg-2 col-sm-2 col-xsml-2 text-right">
        <h4>{{resultValue | sumOfValue:'price'}}</h4>

      </div>
      <div class="col-md-2 col-lg-2 col-sm-2 col-xsml-2 text-right">
        <h4>{{resultValue | totalSumPriceQty:'quantity':'price'}}</h4>

      </div>
    </div>
  </div>
</div>

check this Fiddle Link

Solution 3:

Realizing this answered long ago, but wanted to post different approach not presented...

Use ng-init to tally your total. This way, you do not have to iterate in the HTML and iterate in the controller. In this scenario, I think this is a cleaner/simpler solution. (If the tallying logic was more complex, I definitely would recommend moving the logic to the controller or service as appropriate.)

    <tr>
        <th>Product</th>
        <th>Quantity</th>
        <th>Price</th>
    </tr>

    <tr ng-repeat="product in cart.products">
        <td>{{product.name}}</td>
        <td>{{product.quantity}}</td>
        <td ng-init="itemTotal = product.price * product.quantity; controller.Total = controller.Total + itemTotal">{{itemTotal}} €</td>
    </tr>

    <tr>
        <td></td>
        <td>Total :</td>
        <td>{{ controller.Total }}</td> // Here is the total value of my cart
    </tr>

Of course, in your controller, simply define/initialize your Total field:

// random controller snippet
function yourController($scope..., blah) {
    var vm = this;
    vm.Total = 0;
}

Solution 4:

You can calculate total inside ng-repeat follow:

<tbody ng-init="total = 0">
  <tr ng-repeat="product in products">
    <td>{{ product.name }}</td>
    <td>{{ product.quantity }}</td>
    <td ng-init="$parent.total = $parent.total + (product.price * product.quantity)">${{ product.price * product.quantity }}</td>
  </tr>
  <tr>
    <td>Total</td>
    <td></td>
    <td>${{ total }}</td>
  </tr>
</tbody>

Check result here: http://plnkr.co/edit/Gb8XiCf2RWiozFI3xWzp?p=preview

In case automatic update result: http://plnkr.co/edit/QSxYbgjDjkuSH2s5JBPf?p=preview (Thanks – VicJordan)

Solution 5:

This is my solution

sweet and simple custom filter:

(but only related to simple sum of values, not sum product, I've made up sumProduct filter and appended it as edit to this post).

angular.module('myApp', [])

    .filter('total', function () {
        return function (input, property) {
            var i = input instanceof Array ? input.length : 0;
// if property is not defined, returns length of array
// if array has zero length or if it is not an array, return zero
            if (typeof property === 'undefined' || i === 0) {
                return i;
// test if property is number so it can be counted
            } else if (isNaN(input[0][property])) {
                throw 'filter total can count only numeric values';
// finaly, do the counting and return total
            } else {
                var total = 0;
                while (i--)
                    total += input[i][property];
                return total;
            }
        };
    })

JS Fiddle

EDIT: sumProduct

This is sumProduct filter, it accepts any number of arguments. As a argument it accepts name of the property from input data, and it can handle nested property (nesting marked by dot: property.nested);

• Passing zero argument returns length of input data.
• Passing just one argument returns simple sum of values of that properties.
• Passing more arguments returns sum of products of values of passed properties (scalar sum of properties).

here's JS Fiddle and the code

angular.module('myApp', [])
    .filter('sumProduct', function() {
        return function (input) {
            var i = input instanceof Array ? input.length : 0;
            var a = arguments.length;
            if (a === 1 || i === 0)
                return i;

            var keys = [];
            while (a-- > 1) {
                var key = arguments[a].split('.');
                var property = getNestedPropertyByKey(input[0], key);
                if (isNaN(property))
                    throw 'filter sumProduct can count only numeric values';
                keys.push(key);
            }

            var total = 0;
            while (i--) {
                var product = 1;
                for (var k = 0; k < keys.length; k++)
                    product *= getNestedPropertyByKey(input[i], keys[k]);
                total += product;
            }
            return total;

            function getNestedPropertyByKey(data, key) {
                for (var j = 0; j < key.length; j++)
                    data = data[key[j]];
                return data;
            }
        }
    })

JS Fiddle