Why doesn't the toggle function with the ! operator work when the page loads in JavaScript

Seeking assistance with an onClick event in Angular.js (ng-click) to toggle the color of a table row upon clicking.

Initial implementation is as follows:

   <tr>
        <td ng-class="{'setType': types.isTypeSet('TYPE') == true}" ng-click="types.setType('TYPE')">

            <img class="typebox-img" src="">
            <div class="typebox">TYPE</div>

        </td>
    </tr>

'Type' refers to the type of table row and 'types' corresponds to the angular controller.

Function types.setType(type):

 ...
 this.types[type] = ! this.types[type];
 ...

Upon testing, the values are toggled from the second click onward, but not on the first. Implemented functionality using if-else statements, yet puzzled why it's failing to work correctly - seems like a basic task.

By default, this.types[type] is set to false.

If anyone can shed light on what might be causing this behavior, that would be much appreciated!

Answer №1

It's not surprising that this code isn't functioning as expected:

ng-click='types.setType('type')

To resolve this, use double quotes for the inner quotes to clarify your intent to the parser:

ng-click='types.setType("type")'

Additionally, there's no need for a separate function to handle this. Simply set a boolean value in your controller like so:

$scope.toggle = true

Then utilize it in your view in the following manner:

ng-click='toggle = !toggle'

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