How to handle form.media with dynamic changing page

[HealperDK]

I am building a page where parts of the HTML page is changed dynamically. In certain situations the server sends updated html-snippets that replace parts of the current html.
The challenge I am unable to reload the {{ form.media }} since the header does not get reloaded. This results in the cropping fields no being updated as it is supposed to.
Is there a way to fix this?