Having trouble retrieving the value from the $scope variable

Question

Having trouble retrieving the value from the $scope variable

Includes application module

app.js

var appProfileDetails = angular.module('profileDetailsApp', [
                                       'ngMaterial','ngAria','ngAnimate','ngRoute']);

This module contains the controller file

contactController.js

appProfileDetails.controller('contactController', function($scope) {
    $scope.msg= function() {
        alert($scope.emailId);
    };
});

Html snippet for contact page (Contact.jsp)

<div ng-app="profileDetailsApp">
      <div style="float: left;margin-left: 50px;width: 45%;" ng-controller="contactController" >
           <div ng-include="'/mm/resources/html/ContactDetails2.html'">
     </div>
</div>

The following file is included in the above code snippet

ContactDetails2.html

<div>
    <input type="email" ng-model="emailId"/>
    <input type="button" ng-click="msg()"/>
</div>

javascript angularjs

Answer 1

Answer №1

The main issue is that ng-include creates a new child scope, which disrupts the prototypical scope inheritance.

To gain a deeper understanding of this problem, be sure to check out these recommended resources:

Angularjs ng-model doesn't work inside ng-if.
What are the nuances of scope prototypal / prototypical inheritance in AngularJS?

It is advisable to always utilize the controller as syntax for better code organization and readability. Find out more about its benefits here.

Answer 2

The main issue is that ng-include creates a new child scope, which disrupts the prototypical scope inheritance.

To gain a deeper understanding of this problem, be sure to check out these recommended resources:

Angularjs ng-model doesn't work inside ng-if.
What are the nuances of scope prototypal / prototypical inheritance in AngularJS?

It is advisable to always utilize the controller as syntax for better code organization and readability. Find out more about its benefits here.

Answer 3

Answer №2

To solve this issue, try implementing the controllerAs syntax by using

ng-controller="contactController as contact"

.

In your ContactDetails2 template, make sure to use ng-model="contact.emailId" and update the value of ng-click to contact.msg().

You can also set the emailId as an empty string in the contactController like so: $scope.emailId = ''.

Let's break down what's happening here in simpler terms.

The problem with Angular's scoping lies in its prototypical inheritance. As Angular creates scopes from top to bottom, it first establishes a scope for your controller. However, when it encounters ng-include, it introduces a new inherited scope, causing issues.

This new scope is independent but inherits properties from the parent scope. So, when ng-model searches for emailId in the local scope and doesn't find it, it moves up the chain to the parent scope. Unable to locate emailId there, it creates a new instance locally, leading to the absence of emailId in the parent scope.

To address this issue, ensure that emailId exists in the controller beforehand or utilize the controllerAs syntax. By creating a property (e.g., "contact") in the controller scope, ng-model references this property within ng-include without confusion, effectively resolving the problem.

Familiarize yourself with how scopes operate to navigate around potential challenges in Angular 1. I recommend adhering to style guides like John Papa's guide, which provide insights into these best practices.

Answer 4

To solve this issue, try implementing the controllerAs syntax by using

ng-controller="contactController as contact"

.

In your ContactDetails2 template, make sure to use ng-model="contact.emailId" and update the value of ng-click to contact.msg().

You can also set the emailId as an empty string in the contactController like so: $scope.emailId = ''.

Let's break down what's happening here in simpler terms.

The problem with Angular's scoping lies in its prototypical inheritance. As Angular creates scopes from top to bottom, it first establishes a scope for your controller. However, when it encounters ng-include, it introduces a new inherited scope, causing issues.

This new scope is independent but inherits properties from the parent scope. So, when ng-model searches for emailId in the local scope and doesn't find it, it moves up the chain to the parent scope. Unable to locate emailId there, it creates a new instance locally, leading to the absence of emailId in the parent scope.

To address this issue, ensure that emailId exists in the controller beforehand or utilize the controllerAs syntax. By creating a property (e.g., "contact") in the controller scope, ng-model references this property within ng-include without confusion, effectively resolving the problem.

Familiarize yourself with how scopes operate to navigate around potential challenges in Angular 1. I recommend adhering to style guides like John Papa's guide, which provide insights into these best practices.

Having trouble retrieving the value from the $scope variable

Answer №1

Answer №2

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