Display a div element using AngularJS

Looking for a way to display a div using AngularJS, I came across some solutions on StackOverflow. However, implementing them did not work in my case. Here is my HTML code:

  <div id="myPanel" ng-controller="controllerDependance" ng-show="myvalue" class="ng-cloak">
      Blablabla
  </div>


<div id="DivWhereIsMyButton" class="clearfix" ng-controller="controllerBubble">
    Another div where is my button
    <div id="containerButton" ng-controller="controllerDependance">
        <button class="btn btn-danger btn-lg pull-right"
                ng-click="showAlert()">View dependances
        </button>
    </div>
</div>

This is the controller :

d3DemoApp.controller('controllerBubble', function () {

});

d3DemoApp.controller('controllerDependance', function ($scope) {
    $scope.myvalue = false;
    $scope.showAlert = function(){
        $scope.myvalue = true;
    };
});

I thought that maybe controllerOther was interfering and preventing controllerDiv from functioning properly, but even after separating the two controllers, the issue persisted. The challenge lies in the fact that I need to keep both elements in separate controllers.

With two controllers, controllerDependance and controllerBubble, my desired div resides within controllerDependance while my button is housed in a div managed by controllerBubble. Unfortunately, moving the button is not an option. Therefore, I am looking to encapsulate it within a div controlled by controllerDependance. I have created a Plunker to demonstrate the problem: https://plnkr.co/edit/z1ORNRzHbr7EVQfqHn6z?p=preview Any suggestions? Thank you.

Answer №1

To ensure the div you want to display and hide functions properly, it must be placed within the controller's scope. If it is outside of the controller's scope, the controller function will not recognize it. Additionally, consider the necessity of nested controllers, as they may not always be required for your specific needs.

<div id="divButton" class="clearfix" ng-controller="controllerOther">
    <div id="buttonToShowDiv" ng-controller="controllerDiv">
        <button class="btn btn-danger btn-lg pull-right" ng-click="showAlert()">Show my div</button>

        <div id="myDiv" ng-show="myvalue" class="ng-cloak">
            Blablabla
        </div>
    </div>
</div>

In the provided code snippet, I noticed that

ng-controller="controllerDependance"
is declared twice in the DOM. Although I have not tested this scenario myself, it could lead to complications. According to Angular's documentation on controllers,

When a Controller is attached to the DOM via the ng-controller directive, Angular will instantiate a new Controller object, using the specified Controller's constructor function. A new child scope will be created and made available as an injectable parameter to the Controller's constructor function as $scope

This repetition may be the root cause of the issues you are experiencing. It is essential to have the div intended for show/hide operations within the controller's scope.

I managed to resolve the issue in your Plunker demo; you can view the updated version here: https://plnkr.co/edit/NXbsVFMNHR8twtL8hoE2?p=preview

The problem arose from declaring the same controller twice and crucially, attempting to use ng-show with a value from mainController on a div located outside of that controller's scope. Consequently, ng-show could not access the value. The div must reside within the controller's scope for proper functionality.

Answer №2

You have utilized two separate controllers with distinct $scopes, resulting in unconnected values! Implementing a show/hide functionality for a div in Angular is quite straightforward:

<div id="divButton" class="clearfix" ng-controller="myController">
<div id="buttonToShowDiv">
    <button class="btn btn-danger btn-lg pull-right" ng-click="showAlert()">Show my div</button>
</div>

   <div id="myDiv" ng-show="myvalue" class="ng-cloak">
      Blablabla
   </div>
</div>

On the script side, it's almost identical:

d3DemoApp.controller('myController', function AppCtrl ($scope) {
$scope.myvalue = false;
$scope.showAlert = function(){
    $scope.myvalue = true;
};
});

Since your query was related to displaying elements using Angular, I opted to simplify by utilizing just one controller.

Answer №3

Implement a factory that generates an object and allows your controllers to interact with the same instance:

var app = angular.module('app', [])

app.factory('MyValue', function () {
    return { value: false };
});

app.controller('controllerBubble', function ($scope, MyValue) {
    $scope.myvalue = MyValue;
});

app.controller('controllerDependance', function ($scope, MyValue) {
    $scope.myvalue = MyValue;
    $scope.showAlert = function(){
        $scope.myvalue.value = true;
    };
});
<!DOCTYPE html>
<html>
    <head>
        <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
    </head>

    <body>
        <div ng-app="app">
            <div ng-controller="controllerBubble" class="clearfix">
                <div id="myPanel" ng-controller="controllerDependance" ng-show="myvalue.value" class="ng-cloak">
                    Blablabla
                </div>
            </div>


            <div id="DivWhereIsMyButton" class="clearfix" ng-controller="controllerBubble">
                Another div where is my button
                <div id="containerButton" ng-controller="controllerDependance">
                    <button class="btn btn-danger btn-lg pull-right" ng-click="showAlert()">View dependances</button>
                </div>
            </div>
        </div>
    </body>
</html>

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