Calculating sum of repeated elements in AngularJS ng-repeat

Calculating sum of repeated elements in AngularJS ng-repeat

To calculate the sum of repeated elements in AngularJS using ng-repeat, you can achieve this by using a controller function to accumulate the sum. Here's a simple example:

Assuming you have an array of numbers in your controller's scope:

<!DOCTYPE html> <html ng-app="myApp"> <head> <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.8.2/angular.min.js"></script> </head> <body ng-controller="myController"> <ul> <li ng-repeat="number in numbers"> {{ number }} </li> </ul> <p>Total Sum: {{ calculateSum() }}</p> <script> angular.module('myApp', []) .controller('myController', function ($scope) { $scope.numbers = [1, 2, 3, 4, 5]; $scope.calculateSum = function () { var sum = 0; angular.forEach($scope.numbers, function (number) { sum += number; }); return sum; }; }); </script> </body> </html>

In this example:

  1. We have an array of numbers in $scope.numbers.
  2. We use ng-repeat to iterate through the array and display each number.
  3. We have a controller function calculateSum() that calculates the sum of the numbers using angular.forEach.
  4. The total sum is displayed in the HTML using {{ calculateSum() }}.

Make sure to adjust the code based on your specific use case and data structure.

Examples

  1. "AngularJS ng-repeat sum of repeated elements"

    • Code Implementation:
      <ul ng-app="myApp" ng-controller="myCtrl"> <li ng-repeat="item in items"> {{ item.name }} - Sum: {{ calculateSum(item) }} </li> </ul> <script> angular.module('myApp', []) .controller('myCtrl', function ($scope) { $scope.items = [ { name: 'A', value: 10 }, { name: 'B', value: 20 }, { name: 'A', value: 30 }, { name: 'C', value: 15 }, // Add more items as needed ]; $scope.calculateSum = function (item) { return $scope.items .filter(i => i.name === item.name) .reduce((sum, i) => sum + i.value, 0); }; }); </script>
    • Description: Use ng-repeat to iterate through items and calculate the sum of repeated elements using a custom function calculateSum.

  2. "AngularJS ng-repeat sum of values for each unique element"

    • Code Implementation:
      <ul ng-app="myApp" ng-controller="myCtrl"> <li ng-repeat="(key, value) in uniqueItems"> {{ key }} - Sum: {{ calculateSum(value) }} </li> </ul> <script> angular.module('myApp', []) .controller('myCtrl', function ($scope) { $scope.items = [ { name: 'A', value: 10 }, { name: 'B', value: 20 }, { name: 'A', value: 30 }, { name: 'C', value: 15 }, // Add more items as needed ]; $scope.uniqueItems = $scope.items.reduce(function (accumulator, current) { accumulator[current.name] = accumulator[current.name] || []; accumulator[current.name].push(current); return accumulator; }, {}); $scope.calculateSum = function (items) { return items.reduce((sum, item) => sum + item.value, 0); }; }); </script>
    • Description: Group items by their unique name and then calculate the sum of values for each unique element.

  3. "AngularJS ng-repeat sum of repeated elements with filter"

    • Code Implementation:
      <ul ng-app="myApp" ng-controller="myCtrl"> <li ng-repeat="item in items | unique: 'name'"> {{ item.name }} - Sum: {{ calculateSum(item.name) }} </li> </ul> <script> angular.module('myApp', []) .controller('myCtrl', function ($scope) { $scope.items = [ { name: 'A', value: 10 }, { name: 'B', value: 20 }, { name: 'A', value: 30 }, { name: 'C', value: 15 }, // Add more items as needed ]; $scope.calculateSum = function (name) { return $scope.items .filter(i => i.name === name) .reduce((sum, i) => sum + i.value, 0); }; }) .filter('unique', function () { return function (items, filterOn) { if (filterOn === false) { return items; } if ((filterOn || angular.isUndefined(filterOn)) && angular.isArray(items)) { var hashCheck = {}, newItems = []; var extractValueToCompare = function (item) { if (angular.isObject(item) && angular.isString(filterOn)) { return item[filterOn]; } else { return item; } }; angular.forEach(items, function (item) { var valueToCheck, isDuplicate = false; for (var i = 0; i < newItems.length; i++) { if (angular.equals(extractValueToCompare(newItems[i]), extractValueToCompare(item))) { isDuplicate = true; break; } } if (!isDuplicate) { newItems.push(item); } }); items = newItems; } return items; }; }); </script>
    • Description: Use a custom filter to filter unique elements and calculate the sum for each using a custom function.

  4. "AngularJS ng-repeat sum of values for each unique element with custom filter"

    • Code Implementation:
      <ul ng-app="myApp" ng-controller="myCtrl"> <li ng-repeat="(key, value) in items | groupBy: 'name'"> {{ key }} - Sum: {{ calculateSum(value) }} </li> </ul> <script> angular.module('myApp', []) .controller('myCtrl', function ($scope) { $scope.items = [ { name: 'A', value: 10 }, { name: 'B', value: 20 }, { name: 'A', value: 30 }, { name: 'C', value: 15 }, // Add more items as needed ]; $scope.calculateSum = function (items) { return items.reduce((sum, item) => sum + item.value, 0); }; }) .filter('groupBy', function () { return function (items, field) { var groupedItems = {}; angular.forEach(items, function (item) { var groupKey = item[field]; groupedItems[groupKey] = groupedItems[groupKey] || []; groupedItems[groupKey].push(item); }); return groupedItems; }; }); </script>
    • Description: Use a custom filter to group items by a specific field and then calculate the sum for each group.

  5. "AngularJS ng-repeat sum of repeated elements using controller function"

    • Code Implementation:
      <ul ng-app="myApp" ng-controller="myCtrl"> <li ng-repeat="item in getUniqueItems()"> {{ item.name }} - Sum: {{ calculateSum(item.name) }} </li> </ul> <script> angular.module('myApp', []) .controller('myCtrl', function ($scope) { $scope.items = [ { name: 'A', value: 10 }, { name: 'B', value: 20 }, { name: 'A', value: 30 }, { name: 'C', value: 15 }, // Add more items as needed ]; $scope.getUniqueItems = function () { var uniqueItems = []; angular.forEach($scope.items, function (item) { if (uniqueItems.indexOf(item) === -1) { uniqueItems.push(item); } }); return uniqueItems; }; $scope.calculateSum = function (name) { return $scope.items .filter(i => i.name === name) .reduce((sum, i) => sum + i.value, 0); }; }); </script>
    • Description: Define a controller function (getUniqueItems) to return unique items and calculate the sum for each using a custom function.

  6. "AngularJS ng-repeat sum of repeated elements with lodash"

    • Code Implementation:
      <ul ng-app="myApp" ng-controller="myCtrl"> <li ng-repeat="item in _.uniqBy(items, 'name')"> {{ item.name }} - Sum: {{ calculateSum(item.name) }} </li> </ul> <script> angular.module('myApp', []) .controller('myCtrl', function ($scope, $window) { $scope.items = [ { name: 'A', value: 10 }, { name: 'B', value: 20 }, { name: 'A', value: 30 }, { name: 'C', value: 15 }, // Add more items as needed ]; $scope.calculateSum = function (name) { return $scope.items .filter(i => i.name === name) .reduce((sum, i) => sum + i.value, 0); }; $scope._ = $window._; }); </script>
    • Description: Use lodash library to get unique items and calculate the sum for each using a custom function.

  7. "AngularJS ng-repeat sum of repeated elements with custom directive"

    • Code Implementation:
      <ul ng-app="myApp" ng-controller="myCtrl"> <li ng-repeat="item in items" sum-of-values="calculateSum(item.name)"> {{ item.name }} - Sum: {{ sum }} </li> </ul> <script> angular.module('myApp', []) .controller('myCtrl', function ($scope) { $scope.items = [ { name: 'A', value: 10 }, { name: 'B', value: 20 }, { name: 'A', value: 30 }, { name: 'C', value: 15 }, // Add more items as needed ]; $scope.calculateSum = function (name) { return $scope.items .filter(i => i.name === name) .reduce((sum, i) => sum + i.value, 0); }; }) .directive('sumOfValues', function () { return { scope: { calculateSum: '&' }, link: function (scope, element, attrs) { scope.sum = scope.calculateSum(); } }; }); </script>
    • Description: Create a custom directive (sum-of-values) to calculate the sum of repeated elements for each item.

More Tags

xamarin-studio webpack confluent-schema-registry back pixel java-me material-table amazon-rds hittest multipartform-data

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