How do I pass data from a SELECT field on the page outside of my Angular project?

How do I pass data from a SELECT field on the page outside of my Angular project?

My page is half Angular 7 and half JSP. When a value is selected on a SELECT field in the JSP portion of the page, which is outside of the Angular application, I want to send that value to my Angular 7 app and trigger it to update with the new value. How do I inject the value into the Angular application, and secondly, how do I trigger the application to update using the new value?

My page is half Angular 7 and half JSP. When a value is selected on a SELECT field in the JSP portion of the page, which is outside of the Angular application, I want to send that value to my Angular 7 app and trigger it to update with the new value. How do I inject the value into the Angular application, and secondly, how do I trigger the application to update using the new value?

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