How do you do an alert message under these conditions:
2 dropdownlists "A" and "B"
An item from "B" must be selected first before building SQL to populate dropdownlist for "A"
But users can click on "A" before "B"
How do you have "A" check (when user clicks on it) if
"B" has nothing selected yet and display an alert (popup) message telling user to chose something from "B" first?
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