What is the best way to automatically populate an input field in AngularJS?

I'm trying to populate a full name input box by combining the first name and last name input boxes. I've bound the data from these two values, but for some reason it's not displaying in the full name input box. Any help is appreciated!! Code:

                <div ng-app="myApp" ng-controller="myCtrl">

                First Name: <input type="text" ng-model="firstName"><br>
                Last Name: <input type="text" ng-model="lastName"><br>
                Full Name:<input ng-bind="firstName+" "+lastName>

                    <script>
      var app = angular.module('myApp', []);
      app.controller('myCtrl', function($scope) {
      $scope.firstName = "John";
      $scope.lastName = "Doe";
      });
       </script>

Answer №1

It's not possible to utilize the ng-bind directive for HTML attributes. Refer to the official documentation for more information.

ng-bind is suitable for use with other HTML elements:

<span ng-bind="firstName + ' ' + lastName"></span>

When working with the input tag, you can make use of these directives:

<input type="text"
       ng-model="string"
       [name="string"]
       [required="string"]
       [ng-required="string"]
       [ng-minlength="number"]
       [ng-maxlength="number"]
       [pattern="string"]
       [ng-pattern="string"]
       [ng-change="string"]
       [ng-trim="boolean"]>

Nevertheless, you can apply the curly braces notation within the HTML value attribute:

<input value="{{firstName + ' ' + lastName}}">

For example:

(function() {
  var app = angular.module("myApp", []);
  app.controller("myCtrl", function($scope) {
    $scope.firstName = "John";
    $scope.lastName = "Doe";
  });
}());
<script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.7.5/angular.min.js"></script>
<div ng-app="myApp" ng-controller="myCtrl">

  First Name: <input type="text" ng-model="firstName"><br> Last Name: <input type="text" ng-model="lastName"><br> Full Name: <input value="{{firstName + ' ' + lastName}}">
  <span ng-bind="firstName + ' ' + lastName"></span>
</div>

Answer №2

     <div class="app-container" ng-app="myApp" ng-controller="myCtrl">

            Your First Name: <input type="text" ng-model="firstName"><br>
            Your Last Name: <input type="text" ng-model="lastName"><br>
            Your Full Name:<span ng-bind="fullName"></span>
     </div>

     <script>
          var app = angular.module('myApp', []);
          app.controller('myCtrl', function($scope) {
          $scope.firstName = "Jane";
          $scope.lastName = "Smith";
          $scope.fullName =  $scope.firstName  + " " + $scope.lastName;
       });
     </script>

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