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Change Dropdown Menu Values


I have 2 drop down menus with data populated dynamically from a database.

Category

Subcategory

If i select an appropriate category the subcategory should change instantly to show the subcategories relating to the selected category. But i can't use a form submit, because before the forms are other textboxes with other values that i don't want to wipe on a page refresh.

I need to somehow preload the categories and their related subcategories. I've been trawling through examples, most are harcoded combobox values which won't work for me.




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