Replace the value of a variable when another variable becomes false in Angular.js

Question

Replace the value of a variable when another variable becomes false in Angular.js

Currently, I am working on a project using Angular and have run into an issue that I need help with:

In my project, I have two variables - signed which is a boolean bound to a checkbox, and grade which is an integer bound to a number input field.

I am looking for a way to automatically set signed to true when the value of grade becomes greater than or equal to 2. Additionally, I want grade to automatically change to "1" when signed is set to false. Currently, I am manually calling two functions to achieve this, but I am wondering if there is a more efficient solution.

Any suggestions would be greatly appreciated.

update: I forgot to mention that I have multiple subjects, each with their own signed and grade properties. It is important that changes in one subject's properties do not affect the properties of another subject.

javascript angularjs variables

Answer 1

Answer №1

Here's an example using the ng-change directive:

HTML:

<input ng-model="subjects.a.grade" ng-change="changeGrade('a')">
<input ng-model="subjects.a.signed" ng-change="changeSigned('a')">

In your controller :

$scope.subjects = {'a' : {'signed' :false, 'grade' : 1} ,
                  'b' : {'signed' :false, 'grade' : 2} };

$scope.changeGrade = function(s){
    if($scope.subjects[s].grade >=2  ){
        $scope.subjects[s].signed = true ;
    }
}

$scope.changeSigned = function(s){
    if(!$scope.subjects[s].signed){
        $scope.subjects[s].grade = 1 ;
    }
}

Answer 2

Here's an example using the ng-change directive:

HTML:

<input ng-model="subjects.a.grade" ng-change="changeGrade('a')">
<input ng-model="subjects.a.signed" ng-change="changeSigned('a')">

In your controller :

$scope.subjects = {'a' : {'signed' :false, 'grade' : 1} ,
                  'b' : {'signed' :false, 'grade' : 2} };

$scope.changeGrade = function(s){
    if($scope.subjects[s].grade >=2  ){
        $scope.subjects[s].signed = true ;
    }
}

$scope.changeSigned = function(s){
    if(!$scope.subjects[s].signed){
        $scope.subjects[s].grade = 1 ;
    }
}

Answer 3

Answer №2

Why should you avoid using functions in this way?

<div ng-controller="MyCtrl">

     <input type="checkbox" ng-model="data.signed" ng-change="updateGrade()" />
     <input type="number"   ng-model="data.grade"  ng-change="updateSigned()" />

 </div>

Additionally,

var myApp = angular.module('myApp',[]);

function MyCtrl($scope) {

    $scope.data = 
     {
       grade  : 2, 
       signed : false
     }; 

    $scope.updateGrade 
       = function()  {  this.data.grade  = !this.data.signed ?  1 : this.data.grade; }

    $scope.updateSigned 
       = function() {  this.data.signed =  this.data.grade  >= 2  ? true : false;   }

}

http://jsfiddle.net/k1dbl4ck/HB7LU/21953/

In essence, relying on functions like this may complicate code later when trying to retrieve values from the inputs instead of simply binding them initially and having easy access to the $scope.data model throughout.

Answer 4

Why should you avoid using functions in this way?

<div ng-controller="MyCtrl">

     <input type="checkbox" ng-model="data.signed" ng-change="updateGrade()" />
     <input type="number"   ng-model="data.grade"  ng-change="updateSigned()" />

 </div>

Additionally,

var myApp = angular.module('myApp',[]);

function MyCtrl($scope) {

    $scope.data = 
     {
       grade  : 2, 
       signed : false
     }; 

    $scope.updateGrade 
       = function()  {  this.data.grade  = !this.data.signed ?  1 : this.data.grade; }

    $scope.updateSigned 
       = function() {  this.data.signed =  this.data.grade  >= 2  ? true : false;   }

}

http://jsfiddle.net/k1dbl4ck/HB7LU/21953/

In essence, relying on functions like this may complicate code later when trying to retrieve values from the inputs instead of simply binding them initially and having easy access to the $scope.data model throughout.

Replace the value of a variable when another variable becomes false in Angular.js

Answer №1

Answer №2

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