How to get text box values dynamically using AngularJS

Question

I followed the following tutorial for adding two values in Angular; Addition of Two Numbers in AngularJS

But now I have to sum dynamic text box values inside ng-repeat.

I have the following Code

HTML Code

 ......
        <table>
            <tr>
                <th>Name</th>
                <th>Days</th>
            </tr>
            <tr ng-repeat="si in serImp">
                <td>{{si.Name}}</td>
                <td><input type="number" ng-model="si.Days" /></td>
            </tr>
        </table>
        .......
        <button ng-click="sum()">Calculate</button>
        .......

JS code

.........
        $scope.serImp = [];
        $scope.serImp = data;
                // here data is object contain multiple Name+Durations e.g. 
        /*data = 
        [0]
   Name:"first"
   Days: 1
[1]
   Name:"second"
   Days: 2
[2]
   Name:"third"
   Days: 3*/

         $scope.sum = function () {
// sum code goes here
    }
    ........

My Question is : How can I get the sum of the values/numbers from the ng-model="si.Days"

Luka Jacobowitz · Accepted Answer · 2016-02-14 12:06:49Z

1

Use reduce to sum up all the days. When you modify the values with ng-model you're manipulating the $scope.serImp array. You can then use these values to calculate the sum.

$scope.sum = function () {
     return $scope.serImp.reduce(function(prv, cur) { 
         return prv.Days + cur.Days; 
     });
}

Reduce takes an array and reduces it to one value by applying one function to all of its elements. In our case just simply adding up all the days.

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/Reduce

answered Feb 14, 2016 at 12:06

Luka Jacobowitz

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Comments

Pankaj Parkar · Accepted Answer · 2016-02-14 12:09:25Z

1

I will create function that will return all Days total & will directly bind to html

{{totalDays()}}

Code

$scope.totalDays = function(){
  var totalDays = 0;
  angular.forEach( $scope.serImp, function(si){
     if(si.Days && !isNaN(si.Days)){
        totalDays += Number(si.Days);
     }
  })
}

answered Feb 14, 2016 at 12:09

Pankaj Parkar

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