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QuestionTwo way binding in AngularJS Pin
Member 1110597416-Dec-16 4:50
Member 1110597416-Dec-16 4:50 
I'm trying to understand two way binding in AngularJS but I'm unable to understand the behavior of functions and variables.

Consider the following example:

So, I have a controller like this:

JavaScript
var app=angular.module("cal", []);
        app.controller("calc",function ($scope) {
        $scope.result=Number($scope.a || 0)+ Number($scope.b || 0);
      });


and HTML like this:
<div ng-app="cal">
<div  ng-controller="calc">


<input type="text" ng-model="a"/>
<input type="text" ng-model="b"/>

<span>{{result}}</span>
</div>
</div>


This code doesn't update the variable "result".

However, if I use something like this:

JavaScript
var app=angular.module("cal", []);
        app.controller("calc",function ($scope) {
       $scope.add = function(){
     return (Number($scope.a || 0)+ Number($scope.b || 0));
}
      });


and


<div ng-app="cal">
<div  ng-controller="calc">


<input type="text" ng-model="a"/>
<input type="text" ng-model="b"/>

<span>{{add()}}</span>
</div>
</div>

the value in gets updated automatically with variation in variables "a" or "b".

How does this work? What's the difference in returning from the function and using the variable directly in the DOM?

AnswerRe: Two way binding in AngularJS Pin
Nathan Minier21-Dec-16 3:54
professionalNathan Minier21-Dec-16 3:54 
GeneralRe: Two way binding in AngularJS Pin
Member 1110597421-Dec-16 4:30
Member 1110597421-Dec-16 4:30 
GeneralRe: Two way binding in AngularJS Pin
Nathan Minier21-Dec-16 4:44
professionalNathan Minier21-Dec-16 4:44 
GeneralRe: Two way binding in AngularJS Pin
Member 1110597421-Dec-16 4:57
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GeneralRe: Two way binding in AngularJS Pin
Nathan Minier21-Dec-16 5:12
professionalNathan Minier21-Dec-16 5:12 
GeneralRe: Two way binding in AngularJS Pin
Member 1110597422-Dec-16 4:40
Member 1110597422-Dec-16 4:40 
GeneralRe: Two way binding in AngularJS Pin
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