Is there a way to retrieve the input element's value within the controller using ng-if?

Question

Is there a way to retrieve the input element's value within the controller using ng-if?

After clicking on the submit button, I want the ng-if condition to activate in the DOM so that I can access the properties of the input element or apply a class to it.

<div ng-app="myModule">

<div ng-controller="myController">
  <div ng-if="addInput">
  <input value="123456" id="addInput">

</div>
 <input type="submit" ng-click="login()" value="Login">
</div>
</div>

The controller code is as follows:

 var module = angular.module("myModule", []);

 module.controller("myController", function($scope) {


 $scope.addInput=false;

 $scope.login = function () {
   $scope.addInput = true;
  var invar= document.getElementById('addInput');
  var invalue = invar.value();
  console.log("value was " + invalue);
  };
 });

Check out this JSFiddle example: https://jsfiddle.net/f0aewhuy/. I'm encountering an error in the dev console while testing.

Any suggestions on how I could make this work?

Thanks!

javascript angularjs

Answer 1

Answer №1

The reason for this issue is that the ng-if directive reconstructs a section of the DOM tree based on an addInput. However, before it can be completely rendered in the DOM, it must finish the angular digest cycle, which is the process responsible for angular data binding. To ensure that the digest cycle has finished and the element is now added to the DOM, we can use $timeout like this:

$scope.addInput = true;
$timeout(function() {
  var inputElement = document.getElementById('addInput');
  var inputValue = inputElement.value;
  console.log("value was " + inputValue);
}, 0);

Additionally, there is a typo here:

var inputValue = inputElement.value();

To access the value of an element, we simply need to call inputElement.value as value is a property not a function.

Live Example:

var app = angular.module("myApp", []);
app.controller("myCtrl", function($scope, $timeout) {
  $scope.addInput = false;
  $scope.login = function() {
    $scope.addInput = true;
    $timeout(function() {
      var inputElement = document.getElementById('addInput');
      var inputValue = inputElement.value;
      console.log("value was " + inputValue);
    }, 0);
  };
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.7.5/angular.min.js"></script>
<div ng-app="myApp">

  <div ng-controller="myCtrl">
    <div ng-if="addInput">
      <input value="123456" id="addInput">
    </div>
    <input type="submit" ng-click="login()" value="Login">
  </div>
</div>

Answer 2

The reason for this issue is that the ng-if directive reconstructs a section of the DOM tree based on an addInput. However, before it can be completely rendered in the DOM, it must finish the angular digest cycle, which is the process responsible for angular data binding. To ensure that the digest cycle has finished and the element is now added to the DOM, we can use $timeout like this:

$scope.addInput = true;
$timeout(function() {
  var inputElement = document.getElementById('addInput');
  var inputValue = inputElement.value;
  console.log("value was " + inputValue);
}, 0);

Additionally, there is a typo here:

var inputValue = inputElement.value();

To access the value of an element, we simply need to call inputElement.value as value is a property not a function.

Live Example:

var app = angular.module("myApp", []);
app.controller("myCtrl", function($scope, $timeout) {
  $scope.addInput = false;
  $scope.login = function() {
    $scope.addInput = true;
    $timeout(function() {
      var inputElement = document.getElementById('addInput');
      var inputValue = inputElement.value;
      console.log("value was " + inputValue);
    }, 0);
  };
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.7.5/angular.min.js"></script>
<div ng-app="myApp">

  <div ng-controller="myCtrl">
    <div ng-if="addInput">
      <input value="123456" id="addInput">
    </div>
    <input type="submit" ng-click="login()" value="Login">
  </div>
</div>

Is there a way to retrieve the input element's value within the controller using ng-if?

Answer №1

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