I have a form with a drop-down (multi-select) which populates from a taxonomy. The user chooses one or more options from this list, then has to choose a primary option in a second single-select drop down.
How can I populate the second drop down with the selected values from the first? I’ve tried a few JS examples which seem to use repeaters, but couldn’t get any to work.
Many thanks in advance.
Doing this will be fairly complicated. I do not know of any examples for doing this exactly but there are some examples of other cases available of the web if you do a google search for
acf populate seclect field based on another field
I can give you a rough outline of what you need to do.
The first step will be to use an acf/prepare_field filter to dynamically populate the choices for the second select field based on the first field. This is necessary so that if there is a currently selected value that this value is include in the available choices. Without this step the selected choice will be un-selected when the page is reloaded.