jQuery - set select list from value entered in different form on same page?

The form you have above posts back to a script - which will refresh the page making a jQuery solution irrelevant because anything it does will be wiped in the refresh.

I think we need more pieces of the puzzle

Can you post your page - it is not clear what the form above is doing and what part it plays. Also need to see the tabs.

Thanks for your feedback, the form action can be removed, it's just their as an example.

I just need to know how to set the locations select list in Bookly from another select list.

Are the entry points free form? In other words does the user type in their location rather than select it from a list?

Hi Julian, the user would select their location.

Then can you show me the real code because the code you posted has this

<input id="my_location" onfocus="if(this.value == 'Enter Location') { this.value = ''; }" type="text" value="Location">

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Which implies free form entry.

Also - if the user is selecting the value - why would the select have a location you don't support?

Thanks Julian for your comments, very much appreciated.
Sorry, the website is under construction and blocked by a plugin to public, I can add your IP address if you would like to view?
"my_location" is coming from an autocomplete jQuery linked to a table that lists every location in Australia by zip/postal code but I need to check if Bookly members service the area selected. I am trying to customized the website/Bookly to check if an area is serviced.

my_location" is coming from an autocomplete

Hint: the more information you provide in the beginning the easier it will be to assist you. In future details like this should be included in your opening question :)

Again, I have the same question - if it is an autocomplete - why are you providing options that you may not support?

Thanks Julian, I am trying to customize the Bookly plugin.

My form will display all zip codes in my country, Bookly plugin will only display areas serviced.
If they select a zip code not in Bookly I want to display a "Sorry, we don't service the location entered" and redirect to another page.

If they do select an area that is serviced by Bookly then I want this selection made from the Dropdown list in Bookly.

I hope that makes sense?

I agree with you, it is annoying to tell a user that a zip codes is not available, I already have in place a list in Bookly that only presents available zip codes, but my customers want this option and that is what I have to give them.