# OnChange or something like that on Angular env

**URL:** <https://jsonforms.discourse.group/t/onchange-or-something-like-that-on-angular-env/799>\
**Category:** General\
**Created:** [June 1, 2022, 1:58pm UTC](https://jsonforms.discourse.group/t/onchange-or-something-like-that-on-angular-env/799 "2022-06-01T13:58:39Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![bielsouza99](https://yyz2.discourse-cdn.com/free1/user_avatar/jsonforms.discourse.group/bielsouza99/32/320_2.png) [@bielsouza99](https://jsonforms.discourse.group/u/bielsouza99)\
**Post date:** [June 1, 2022, 1:58pm UTC](https://jsonforms.discourse.group/t/onchange-or-something-like-that-on-angular-env/799/1 "2022-06-01T13:58:39Z")

</div>

Hi All,

I’m working with jsonforms creating dropdowns fields and now I’m having a problem, I created a OneOf schema where it is dependent on another field, when I select the first one, I can filter the other ones correctly without problems. Now, I need to clear/reload the fields/data when I want, but when I try to do it I receive an error in a console, whole information is coming from the API endpoint, then, I need a function or property to do a new API call without lost the information that I already filled, I have this scenario:

Field 1 - Countries  
Field 2 - States of the country  
Field 3 - Cities of State

Example:

I selected Brazil on **Field 1** , and now I have all states from Brazil, then I can select Santa Catarina in a **Field 2** and can select Florianópolis in the **Field 3** , now I need select in **Field 1** USA, and when I select it, I need to refresh the **Field 2** and **Field 3** , where the **Field 2** will appear the states from the USA and the **Field 3** will appear the cities of the state selected.

Does someone have any idea how to achieve it in an Angular environment?