jQuery UI: sortable('toArray') returns an empty array

Question

This has me stumped. The follow code returns \",,,,,,\":

Answer 1

If serialize returns an empty string, make sure the id attributes include an underscore. They must be in the form: "set_number" For example, a 3 element list with id attributes "foo_1", "foo_5", "foo_2" will serialize to "foo[]=1&foo[]=5&foo[]=2". You can use an underscore, equal sign or hyphen to separate the set and number. For example "foo=1", "foo-1", and "foo_1" all serialize to "foo[]=1".

jq sortable reference