The ng-model is not functioning properly between two Ionic directives

Question

The ng-model is not functioning properly between two Ionic directives

<body ng-app="app">
    <ion-pane ng-controller="myCtrl">
      <ion-header-bar class="bar-stable">
      </ion-header-bar>
      <ion-content class="padding">
        <input ng-model="myInput" style="border:1px solid #ddd;width:100%;padding:5px" type="text" placeholder="search"/>


        <br>
        <br>
        <br>
        <br>
        <br>
         <ion-footer-bar ng-show="!loading" align-title="center">
    <div class="padding" style="position:absolute;bottom:0;width:100%">
      <button ng-click="search(myInput)" class="button button-block button-positive footer-btn" type="submit">able to get myInput value if placed within ion-content</button>
    </div>
  </ion-footer-bar>


      </ion-content>

      <ion-footer-bar ng-show="!loading" align-title="center">
    <div class="padding" style="position:absolute;bottom:0;width:100%">
      <button ng-click="search(myInput)" class="button button-block button-positive footer-btn" type="submit">cannot retrieve myInput value here</button>
    </div>
  </ion-footer-bar>


    </ion-pane>
  </body>

What is the best solution for this issue? I am facing a dilemma where I need to separate the click event and input field into two different directives for styling purposes, but this approach is leading to difficulties in accessing the value of ng-model.

javascript angularjs ionic-framework

Answer 1

Answer №1

When faced with challenges using $scope, one effective alternative is to utilize the ControllerAs syntax method.

The ControllerAs syntax provides a clear distinction of which controller a specific function or attribute pertains to, while enforcing Angular's "always use a dot" guideline to avoid any prototype inheritance concerns.

This isn't the sole solution to the issue at hand, but adopting this approach can aid in constructing a more resilient application with fewer complications associated with $scope.

angular.module('app', ['ionic'])

.controller('myCtrl', function() {
  var ctrl = this;
  ctrl.search = function(value) {
    alert(value);
  };
});

<!DOCTYPE html>
<html>

<head>
  <meta charset="utf-8">
  <meta name="viewport" content="initial-scale=1, maximum-scale=1, user-scalable=no, width=device-width">
  <link href="https://code.ionicframework.com/1.0.0/css/ionic.min.css" rel="stylesheet">
  <script src="https://code.ionicframework.com/1.0.0/js/ionic.bundle.js"></script>
</head>

<body ng-app="app">
  <ion-pane ng-controller="myCtrl as ctrl">
    <ion-header-bar class="bar-stable">
    </ion-header-bar>
    <ion-content class="padding">
      <input ng-model="ctrl.myInput" style="border:1px solid #ddd;width:100%;padding:5px" type="text" placeholder="search" />


      <br>
      <br>
      <br>
      <br>
      <br>
      <ion-footer-bar ng-show="!loading" align-title="center">
        <div class="padding" style="position:absolute;bottom:0;width:100%">
          <button ng-click="ctrl.search(ctrl.myInput)" class="button button-block button-positive footer-btn" type="submit">able to get myInput value if put within ion-content</button>
        </div>
      </ion-footer-bar>


    </ion-content>

    <ion-footer-bar ng-show="!loading" align-title="center">
      <div class="padding" style="position:absolute;bottom:0;width:100%">
        <button ng-click="ctrl.search(ctrl.myInput)" class="button button-block button-positive footer-btn" type="submit">cannot get myInput value here</button>
      </div>
    </ion-footer-bar>


  </ion-pane>
</body>

</html>

Answer 2

When faced with challenges using $scope, one effective alternative is to utilize the ControllerAs syntax method.

The ControllerAs syntax provides a clear distinction of which controller a specific function or attribute pertains to, while enforcing Angular's "always use a dot" guideline to avoid any prototype inheritance concerns.

This isn't the sole solution to the issue at hand, but adopting this approach can aid in constructing a more resilient application with fewer complications associated with $scope.

angular.module('app', ['ionic'])

.controller('myCtrl', function() {
  var ctrl = this;
  ctrl.search = function(value) {
    alert(value);
  };
});

<!DOCTYPE html>
<html>

<head>
  <meta charset="utf-8">
  <meta name="viewport" content="initial-scale=1, maximum-scale=1, user-scalable=no, width=device-width">
  <link href="https://code.ionicframework.com/1.0.0/css/ionic.min.css" rel="stylesheet">
  <script src="https://code.ionicframework.com/1.0.0/js/ionic.bundle.js"></script>
</head>

<body ng-app="app">
  <ion-pane ng-controller="myCtrl as ctrl">
    <ion-header-bar class="bar-stable">
    </ion-header-bar>
    <ion-content class="padding">
      <input ng-model="ctrl.myInput" style="border:1px solid #ddd;width:100%;padding:5px" type="text" placeholder="search" />


      <br>
      <br>
      <br>
      <br>
      <br>
      <ion-footer-bar ng-show="!loading" align-title="center">
        <div class="padding" style="position:absolute;bottom:0;width:100%">
          <button ng-click="ctrl.search(ctrl.myInput)" class="button button-block button-positive footer-btn" type="submit">able to get myInput value if put within ion-content</button>
        </div>
      </ion-footer-bar>


    </ion-content>

    <ion-footer-bar ng-show="!loading" align-title="center">
      <div class="padding" style="position:absolute;bottom:0;width:100%">
        <button ng-click="ctrl.search(ctrl.myInput)" class="button button-block button-positive footer-btn" type="submit">cannot get myInput value here</button>
      </div>
    </ion-footer-bar>


  </ion-pane>
</body>

</html>

Answer 3

Answer №2

Check out the updated code at this link

The issue arises due to the difference in the $scope between two buttons, causing the value of $scope.myInput not to be shared correctly.

To resolve this, one solution is to introduce a new object with $scope.model = {}; and then reference this model object using ng-model="model.myInput" and ng-click="search(model.myInput)". This way, the inner scope can access the same model object.

Below is a simplified demonstration of this issue:

var scope = {};
scope.myInput = '1';
var innerScope = Object.create(scope);
console.log(innerScope.myInput); // 1
innerScope.myInput = '2'; // myInput is now 2 on innerScope
console.log(innerScope.myInput); // 2
console.log(scope.myInput); // 1 <-- still remains as 1 on scope

scope.model = {};
scope.model.myInput = '1';
console.log(innerScope.model.myInput); // 1
innerScope.model.myInput = '2'; // 
console.log(innerScope.model.myInput); // 2
console.log(scope.model.myInput); // 2 <-- modifying model.Input is visible on parent scope as they are both modifying the same model object

Answer 4

Check out the updated code at this link

The issue arises due to the difference in the $scope between two buttons, causing the value of $scope.myInput not to be shared correctly.

To resolve this, one solution is to introduce a new object with $scope.model = {}; and then reference this model object using ng-model="model.myInput" and ng-click="search(model.myInput)". This way, the inner scope can access the same model object.

Below is a simplified demonstration of this issue:

var scope = {};
scope.myInput = '1';
var innerScope = Object.create(scope);
console.log(innerScope.myInput); // 1
innerScope.myInput = '2'; // myInput is now 2 on innerScope
console.log(innerScope.myInput); // 2
console.log(scope.myInput); // 1 <-- still remains as 1 on scope

scope.model = {};
scope.model.myInput = '1';
console.log(innerScope.model.myInput); // 1
innerScope.model.myInput = '2'; // 
console.log(innerScope.model.myInput); // 2
console.log(scope.model.myInput); // 2 <-- modifying model.Input is visible on parent scope as they are both modifying the same model object

The ng-model is not functioning properly between two Ionic directives

Answer №1

Answer №2

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