Connecting Modal from a multi drop down selection

Good day I am working on a business directory linked to profile cards.
I an trying to connect a modal or a fake modal to a multi drop down of Industry, Category and location,
so that there is no company listed under that selection the modal will come up to tell the user and then redirect them to the search page again.

I have the modal designed and linked up, I just cant get it only show up if there is no result!

Hope someone can share some light on this for me, please!

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