Here are the code snippets demonstrating the toggling of the hideQA value. The value changes correctly in both conditions, but the divs are not hiding properly when using -
`<button ng-click="hideQA = !hideQA">Reset</button>`
However, if I change the value from a method like -
`<button ng-click="resetForm()">Reset</button>`
Can somebody provide an explanation for this behavior?
View Working Plnkr - http://plnkr.co/edit/rIAAcibX2Ts1VaMWKQtc?p=preview
ng-if creates its own $scope, so when the element is removed, the $scope is also removed. To access the parent scope, you need to use $parent.
<button ng-click="$parent.hideQA = !hideQA">Reset</button>
Another approach is to utilize ng-show.
<div class="message" ng-show="hideQA !== false">
This is div two !!!
<button ng-click="hideQA = !hideQA">Reset</button>
</div>
The reason for this issue is due to the limitation of inheritance within scopes.
To avoid any issues, it is recommended to use dot notation.
Check out the plunkr example: http://plnkr.co/edit/ES9qTl7nsmGGOJnE0H8u?p=preview
For more information on dot notation, refer to the accompanying article.
Below is a sample code snippet demonstrating the usage of dot notation:
<button ng-click="a.hideQA = !a.hideQA">Reset</button>
$scope.a = {hideQA:false};
$scope.a.hideQA = true;
The solution provided above has successfully addressed the issue. You can view my working example on Plunker by following this link: http://plnkr.co/edit/ZdL441bBmQToGZn4gfQt?p=preview. Additionally, I would like to add:
According to the official AngularJS documentation, using ng-if creates its own scope which inherits from the parent scope through prototypal inheritance.
The scope created within ngIf inherits from its parent scope using prototypal inheritance.
In essence, when referencing a value from the parent scope, only the value itself is copied for primitive types (such as string, integer, boolean, etc.) and not the reference (or pointer). This results in one-way reference rather than two-way. To achieve two-way binding, it is recommended to always use a JavaScript object {attribute: value}. This is why using a dot notation (.) is preferred.
I highly recommend reading this informative article about scopes that is worth 20 minutes of your time: https://github.com/angular/angular.js/wiki/Understanding-Scopes
I hope this explanation proves helpful to you :)
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