"An undefined message will be displayed in AngularJS if there is no content

When the two textboxes are left empty, you will see errors as 'undefined' displayed. These errors disappear once content is entered.

The code I have written looks like this:

Default.aspx

<div ng-app="Welcomecontroller" ng-controller="FullName">
        <label>Name:</label>
        <input type="text" ng-model="Fornavn" placeholder="Enter a name here">
        <input type="text" ng-model="Efternavn" placeholder="Enter a name here">
        <hr>
        <h1>{{fullName()}}</h1>
        </div>

WelcomeController.js

var Welcome = angular.module('Welcomecontroller', []);
Welcome.controller('FullName', function ($scope) {
    $scope.fullName = function () {
        return "Welcome to " + $scope.Fornavn + " " + $scope.Efternavn;
    }
});

If there is no content, it will display like this:

Welcome to undefined undefined

I also attempted to check if the content was empty and handle it accordingly.

WelcomeController.js

var Welcome = angular.module('Welcomecontroller', []);
Welcome.controller('FullName', function ($scope) {
    if ($scope.Fornavn != "" && $scope.Efternavn != "") {
        $scope.fullName = function () {
            return "Welcome to " + $scope.Fornavn + " " + $scope.Efternavn;
        }
    }
    else
    {
        return "Test";
    }
});

Answer №1

To perform a conditional check, you can simply embed ng-if directly in the template.

<div ng-app="Welcomecontroller" ng-controller="FullName as fullname">
    <label>Name:</label>
    <input type="text" ng-model="fullname.Fornavn" placeholder="Enter a name here">
    <input type="text" ng-model="fullname.Efternavn" placeholder="Enter a name here">
    <hr>
    <h1 ng-if="fullname.Fornavn && fullname.Efternavn">
    Welcome to {{fullname.Fornavn}} {{fullname.Efternavn}}</h1>
    <h1 ng-if="!fullname.Fornavn || !fullname.Efternavn">Test</h1>
    </div>

This setup eliminates the need for any additional code in the controller.

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