Add items to an array without duplicating them

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Add items to an array without duplicating them

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#1 by (2 votes)
#2 by (1 votes)

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Friends good Sunday, I need to add data to an Array, I'm making a kind of shopping cart and I'm at the point where I need to add to a list the products that the end customer wants to buy, the way I use is as follows:

<div class="col-sm-4 text-right" style="width:90px">
 <h-number value="inicial" min="0" max="10" step="1" change="realizarSuma(co,inicial)"></h-number>
     <div  class="precio">
        ${{co.precio*inicial}}
     </div>
 </div>

This goes like this: Through a number-picker I assign value="inicial" that is $scope.inicial = 0; and it goes adding or subtracting, in the value change="realizarSuma(co,inicial)" that is like a kind of ng-change that reacts to the change of the buttons + o - I send co that corresponds to an array with all the caffe information available (in this case it sends 3 array) and finally command the value inicial which is the number of the amount that was requested.

$scope.realizarSuma = function(item,inicial){

  var producto = item.producto;
  var contador = inicial;
  var precio = item.precio; 
  var numerico = item.numerico; //identificador
  var preciototal = precio*contador; //total de compra por producto
  $scope.coffedate = [];

  $scope.coffedate.push({total:preciototal,identificador:numerico})

  console.log($scope.coffedate);
}

What I do here after passing the data to a variable is to add the data to an array to measures that are closed by pressing + or - but the problem is that the value is replaced (as seen in the image) and that It does not work for me.

I think I need to receive the data with a condition, for that I have numerico that is a unique value of each product, so I tried to do a kind of search with for when pressing + or - to scroll through the for and find if there is numerico and if it exists that saves the last value.

but something is wrong, please help!

angularjs function arraylist

asked by Hernan Humaña 22.01.2017 в 21:40

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2 answers

1

this $scope.coffedate = [];

should be up- out of $scope.realizarSuma = function(item,inicial){

Explanation:

But your arrangement is always empty, why do you assign [], $scope.coffedate = []; ,

then you want to add an element to your arrangement, therefore your arrangement will always have one element at most.

We'll see:

var numerico = item.numerico; //identificador
  var preciototal = precio*contador; //total de compra por producto
  $scope.coffedate = [];//declaracion de tu array vacio

  $scope.coffedate.push({total:preciototal,identificador:numerico})

  console.log($scope.coffedate);

answered by 23.01.2017 в 00:19

IndexError: list index out of range Implement a def within an if [PYTHON]

score 2 · Accepted Answer

For the handling of arrangements and objects I recommend you use Lodash , it is an excellent library that was based on other as Underscore to facilitate this task and today it is used in a variety of Frameworks, as well as it is very well maintained and has excellent documentation.

As for your case, you could do it very easily in the following way:

//Por ejemplo $scope.coffedate es igual a [{ 'id': 1 }, { 'id': 2 }];
$scope.coffedate = $scope.coffedate || []; //Validar que sea un arreglo
var newItem = { 'id': 1 }; //Nuevo elemento a agregar
$scope.coffedate = _.unionBy($scope.coffedate, [newItem], 'id'); //Donde id es el identificador

Greetings, Nicholls