Changing various $scope object properties using ng-model

Question

Changing various $scope object properties using ng-model

Can you help me figure out why the $scope.data variable is not updating when I input valid values in the form fields? How can I solve this issue?

Check out the code example on Codepen: http://codepen.io/uloco/pen/jboorN

HTML

<div ng-app="app" ng-controller="AppController" class="content">
    <input type="tel" ng-model="form.phone" placeholder="phone" />
    <input type="email" ng-model="form.email" placeholder="email" />
    <p>{{form}}</p>
    <p>{{data}}</p>
</div>

JS

angular
.module('app', [])
.controller('AppController', function($scope) {
    $scope.form = {};
    $scope.data = {
        foo: 'bar',
        phone: $scope.form.phone,
        email: $scope.form.email
    }
});

javascript angularjs data-binding angular-ngmodel angularjs-ng-model

Answer 1

Answer №1

What is the reason for the lack of updates in the $scope.data variable?

The issue lies in the absence of a connection between $scope.data and $scope.form. These two are separate objects with their own independent properties, so any changes made to the $scope.form will not be reflected in the $scope.data.

If you wish to keep these as distinct objects, you will need to manually synchronize them using either $scope.$watch on the $scope.form:

$scope.$watch('form', function(obj) {
    $scope.data.phone = obj.phone;
    $scope.data.email = obj.email;
}, true);

Check out the demonstration here: http://codepen.io/anon/pen/PPvvBr?editors=101

Alternatively, you can use ngChange directives:

<input type="tel" ng-model="form.phone" placeholder="phone" ng-change="sync()" />
<input type="email" ng-model="form.email" placeholder="email" ng-change="sync()" />

And then define the synchronization function like this:

$scope.sync = function() {
    $scope.data.phone = $scope.form.phone;
    $scope.data.email = $scope.form.email;
};

See the demo using ngChange here: http://codepen.io/anon/pen/bVyyQN?editors=101

In this scenario, the ngChange solution is recommended. However, if there are more than two fields involved, using $watch might be simpler.

Answer 2

What is the reason for the lack of updates in the $scope.data variable?

The issue lies in the absence of a connection between $scope.data and $scope.form. These two are separate objects with their own independent properties, so any changes made to the $scope.form will not be reflected in the $scope.data.

If you wish to keep these as distinct objects, you will need to manually synchronize them using either $scope.$watch on the $scope.form:

$scope.$watch('form', function(obj) {
    $scope.data.phone = obj.phone;
    $scope.data.email = obj.email;
}, true);

Check out the demonstration here: http://codepen.io/anon/pen/PPvvBr?editors=101

Alternatively, you can use ngChange directives:

<input type="tel" ng-model="form.phone" placeholder="phone" ng-change="sync()" />
<input type="email" ng-model="form.email" placeholder="email" ng-change="sync()" />

And then define the synchronization function like this:

$scope.sync = function() {
    $scope.data.phone = $scope.form.phone;
    $scope.data.email = $scope.form.email;
};

See the demo using ngChange here: http://codepen.io/anon/pen/bVyyQN?editors=101

In this scenario, the ngChange solution is recommended. However, if there are more than two fields involved, using $watch might be simpler.

Answer 3

Answer №2

If you want to dynamically update phone and email fields, you can use ng-change directive in AngularJS:

 $scope.updateFields = function(data){
        $scope.data.phone = data.phone;
        $scope.data.email = data.email;
    };

Then in your HTML:

<input type="tel" ng-model="form.phone" placeholder="phone" ng-change="updateFields(form);"/>
<input type="email" ng-model="form.email" placeholder="email" ng-change="updateFields(form);"/>

Answer 4

If you want to dynamically update phone and email fields, you can use ng-change directive in AngularJS:

 $scope.updateFields = function(data){
        $scope.data.phone = data.phone;
        $scope.data.email = data.email;
    };

Then in your HTML:

<input type="tel" ng-model="form.phone" placeholder="phone" ng-change="updateFields(form);"/>
<input type="email" ng-model="form.email" placeholder="email" ng-change="updateFields(form);"/>

Answer 5

Answer №3

Upon setting up the controller, both $scope.form.phone and $scope.form.email are initially undefined. However, even if $scope.form undergoes changes, $scope.data remains unaware since it simply contains "undefined".

To access the data, you can create a function like the following:

$scope.retrieveData = function () {
    return {
        name: 'John Doe',
        phoneNumber: $scope.form.phone,
        emailAddress: $scope.form.email
    };
};

This ensures that the object is freshly initialized whenever required.

Answer 6

Upon setting up the controller, both $scope.form.phone and $scope.form.email are initially undefined. However, even if $scope.form undergoes changes, $scope.data remains unaware since it simply contains "undefined".

To access the data, you can create a function like the following:

$scope.retrieveData = function () {
    return {
        name: 'John Doe',
        phoneNumber: $scope.form.phone,
        emailAddress: $scope.form.email
    };
};

This ensures that the object is freshly initialized whenever required.

Answer 7

Answer №4

The content within your $scope.data variable remains the same even when the phone or email fields are changed.

Consider implementing the $watchGroup function to monitor changes in both phone and email fields at once.

$scope.$watchGroup(['form.phone', 'form.email'], function(newValues, oldValues, scope) {
  scope.data = {
        foo: 'bar',
        phone: scope.form.phone,
        email: scope.form.email
 }
});

Answer 8

The content within your $scope.data variable remains the same even when the phone or email fields are changed.

Consider implementing the $watchGroup function to monitor changes in both phone and email fields at once.

$scope.$watchGroup(['form.phone', 'form.email'], function(newValues, oldValues, scope) {
  scope.data = {
        foo: 'bar',
        phone: scope.form.phone,
        email: scope.form.email
 }
});

Answer 9

Answer №5

If you want to incorporate HTML

<div ng-app="app" ng-controller="AppController" class="content">
    <input type="tel" ng-model="form.phone" placeholder="phone" />
    <input type="email" ng-model="form.email" placeholder="email" />
    <p>form: {{form}}</p>
    <p>data: {{data()}}</p>
</div>

For JavaScript:

angular
    .module('app', [])
    .controller('AppController', function($scope) {
        $scope.form = {};
        $scope.data = function() {
            return {
                foo: 'bar',
                phone: $scope.form.phone,
                email: $scope.form.email
            };
        }
    });

Check out the updated codepen here: http://codepen.io/anon/pen/Xmwwye

Answer 10

If you want to incorporate HTML

<div ng-app="app" ng-controller="AppController" class="content">
    <input type="tel" ng-model="form.phone" placeholder="phone" />
    <input type="email" ng-model="form.email" placeholder="email" />
    <p>form: {{form}}</p>
    <p>data: {{data()}}</p>
</div>

For JavaScript:

angular
    .module('app', [])
    .controller('AppController', function($scope) {
        $scope.form = {};
        $scope.data = function() {
            return {
                foo: 'bar',
                phone: $scope.form.phone,
                email: $scope.form.email
            };
        }
    });

Check out the updated codepen here: http://codepen.io/anon/pen/Xmwwye

Changing various $scope object properties using ng-model

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

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