Image Upload Custom Form Field for Category and Custom Taxonomy

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There are several tasks you need to perform when you choose to do with custom code. And I personally think they’re complicated tasks. Here is the list of what I can imagine.

  1. Hook to the category edit page to add a new form for upload image. This can be done with the hook {$taxonomy}_add_form_fields.
  2. Handle the image upload. Depend on what you want the upload field to be, it can be a HTML file input or a button to open the Media Library popup.
  3. If it’s just a file input, then you have to work with pure PHP to handle upload via $_FILES.
  4. If it uses Media Library, then you need to work with JS to trigger the popup.

As you’re developing a theme, it can take a lot of time working on that. Besides, it belongs to plugin territory.

So, I’d suggest using a plugin for that. Meta Box framework with MB Term Meta extension works great in this case.

Disclaimer: I’m the author of Meta Box.