Set job_location field from other field values (to separate job_location into multiple fields)

functions.php

<?php 

add_action( 'submit_job_form_start', 'smyles_auto_set_job_location' );

function smyles_auto_set_job_location() {

	echo "
		<script>
		jQuery( function( $ ){
			function smyles_update_job_location(){
				var address = $('#job_address').val();
				var city = $('#job_city').val();
				var state = $('#job_state').val();
				
				var built_location = state;
				
				if( city.length > 0 && address.length > 0 ){
					built_location = address + ' ' + city + ', ' + state; 
				}
				
				$('#job_location').val( built_location );
			}
			
			$('#job_address').change( smyles_update_job_location );
			$('#job_city').change( smyles_update_job_location );
			$('#job_state').change( smyles_update_job_location );
			
			setTimeout( smyles_update_job_location, 2000 );
		});
		</script>
	";
}

For this to work you MUST change the job_location field to a hidden field type. You must also then add 3 additional fields as well, the job_address for actual address, job_city for actual city, and job_state for actual state. These fields can be dropdown, or text fields (can NOT be taxonomies)