AngularJS: Creating a one-to-one relationship between JavaScript objects within the same array

I am trying to establish a connection between two objects in the same array to indicate that one task must be completed before the other can begin. I attempted to use AngularJS's ng-options directive by setting the child object as a property of the parent object using ng-model. This method successfully created a reference to the child object within the parent object, allowing changes made to the child object to reflect in the parent object rather than duplicating it.

However, I am now encountering two challenges:

  • When it comes to recreating the array between sessions, I plan to store the data in a database and/or local storage. Would it be best to assign a unique ID to each object and use that ID to set the property during the loading sequence? Should I utilize Angular's private $$hashkey property for this purpose, or would it be better to create my own "primary keys" for these objects? (I may need to do that eventually regardless)
  • While setting the child object as a property of the parent object works well, I am unsure how to go about looking up the parent object when I am working with the child. Would I need to iterate through the entire array and find the ID that matches in order to locate the parent object?

Any advice would be greatly appreciated. Thank you.

javascriptarraysangularjsng-options

Answer №1

To efficiently handle relationships in bindings, utilizing the Angular framework is key. By implementing a recursive template in the view and creating a corresponding model in javascript/typescript for the view to bind to, the process is streamlined.

The strategy involves employing the ng-template directive as a script embedded within the parent HTML view.

To tailor the solution to your specific needs, consider adjusting controller properties and binding them to the model. For instance, demonstrating or hiding certain controls can be achieved by utilizing the ng-if directive based on the parent model's value.

Below is an example of the required HTML code:

<script type="text/ng-template" id="recursiveTemplate">
   <ul>
      <li ng-repeat="field in record.fields" ng-include="'recursiveTemplate'">
      </li>
   </ul>
</script>

<ul ng-controller="childCtrl">
   <li ng-repeat="field in records" data-ng-include="'recursiveTemplate'">
   </li>
</ul>

For further insights, explore relevant discussions on Stack Overflow regarding recursive templates.

Check out this example: Previous response on recursive templates in AngularJS on Stack Overflow

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