Drop-down filtered from user input on same page

[crono999]

I'm still pretty much a newb to php, so hopefully what I'm asking is rather easy and someone can at least point me in the right direction.

At the bottom of an order form on my site I have a dropdown box from which the user must select from a list of pre-defined shipping schedules. I currently have the dropdown filtered by only displaying shippings where the date is >= now(). However, just above this box they input a pick-up date in a text field, or by selecting a date from a pop-up calendar that then fills in the text fields. How would I be able to have the dropdown filtered by a date >= the user input? I'm assuming it would be an action that would filter the dropdown each time the user clicks outside of date text field, but I'm not really sure where to start and haven't come across anything helpful, in this regard, during my forum searching.

Thanks in advance for any possible help...

[wilku]

It's not a php question, as it is all done client side. Nevertheless text inputs have onChange actions, which seem suitable for your purpose. For more details look in JavaScripts forums (where they know better how to deal with it).

[crono999]

thanks a lot for the quick response. No wonder I haven't found anything about what i'm trying to do, been barking up the wrong tree...