The autocompleteFromQuery works well however it adds a semicolon at the end. Any

It puts a semicolon because you are passing "true" in the "allows multiple" input of the function and/or because your field has the "Allow multiple values" checkbox enabled in the forms designer.

The definition of the function is:

FormAPI.attachAutocompleteFromQuery = function(fieldId, datasource, query,
id_attr, display_attr, multiple)

as you can see the last parameter is a boolean to indicate whether your auto-complete field will accept multiple values in which case they will be semicolon separated.

It puts a semicolon because you are passing "true" in the "allows multiple" input of the function and/or because your field has the "Allow multiple values" checkbox enabled in the forms designer.

The definition of the function is:

FormAPI.attachAutocompleteFromQuery = function(fieldId, datasource, query,
id_attr, display_attr, multiple)

as you can see the last parameter is a boolean to indicate whether your auto-complete field will accept multiple values in which case they will be semicolon separated.