Error message "Assignment operation cannot occur on the left side" occurs when attempting to use the NOT operator

Currently, I have this function in use:

$scope.myFunction = function(indexParent, childrenLength) {

    // close all inner accordion tabs
     for(i=0; i < childrenLength; i++) {
       !$scope.lettersandnumbers[indexParent].things[i].open = $scope.lettersandnumbers[indexParent].things[i].open;
     }

    // toggle parent tab
    $scope.lettersandnumbers[indexParent].open = !$scope.lettersandnumbers[indexParent].open;

 }

In the section where it says: 

<button ng-click="myFunction(0, 3)">Toggle a</button>
However, the 'close all inner accordion tabs' part is causing an issue with the Invalid left-hand side in assignment error. How can I modify the code to resolve this problem?

If you'd like to test the code, you can find it here: https://plnkr.co/edit/TlKhBZer1wYMW0XXBcqO?p=preview

Thank you very much

UPDATE

You can find the solution with some changes made here: https://plnkr.co/edit/aMD5rGxpe48lziTb6xPk?p=preview

javascriptangularjslogical-operators

Answer №1

Ensure your code aligns with the following structure:

$scope.myFunction = function(indexParent, childrenLength) {

    // close all inner accordion tabs
     for(i=0; i < childrenLength; i++) {
       $scope.lettersandnumbers[indexParent].things[i].open = !$scope.lettersandnumbers[indexParent].things[i].open;
     }

    // toggle parent tab
    $scope.lettersandnumbers[indexParent].open = !$scope.lettersandnumbers[indexParent].open;

 }

The position of the ! operator is crucial in assignments.

UPDATE:

Demonstration that ! cannot be used on the left side: 

var a = true;
console.log(a);
!a = a;

IMPROVEMENT 2:

$scope.myFunction = function(indexParent, childrenLength) {

  // Initially close the outer tab
   $scope.lettersandnumbers[indexParent].open = !$scope.lettersandnumbers[indexParent].open;

  // Close all inner tabs if the outer tab is closed
  for(i=0; i < childrenLength; i++) {
    $scope.lettersandnumbers[indexParent].things[i].open = !$scope.lettersandnumbers[indexParent].open ? false : $scope.lettersandnumbers[indexParent].things[i].open;
  }
}

A ternary operator is being utilized here to decide whether the inner tabs should be closed or not.

Observing that myFunction is exclusively triggered by a button click, you must ensure it functions properly when selecting an outer accordion element.

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