Clear canvas and not form

Question

Hi,
I am having 2 canvas both content canvas in one form.
There are lov dropdowns to get the values and when queried we get result set in plsql table type.
Both the canvas are identical and value from result set of one canvas get populate on the other canvas.(same lov selected values)
can anybody tell how to clear the second canvas without exiting from the canvas so that if i want to select new lov i can be able to do that?
what trigger can i use to clear only the values of the lov on the sceond canvas and not the whole form(like we use clear_form).
Thanks,
Mandar.

Answer 1

canvas is not something which holds data. canvas holds items. you can either clear item or clear block or clear whole form to clear the data, but saying something like clear canvas is different. one canvas can hold data of 2-3 (or may be more) different blocks. you need to specifically check which item/block you want to clear and then clear it, either using clear_block or clear_item or may be manually assigning NULL value to each individual item. but there is nothing called clear_canvas.