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When attaching JQuery UI’s datepicker you should not use the class hasDatepicker since JQuery UI uses this class to mark DOM objects that already have a datepicker attached. So it won’t attach a datepicker to elements with that class.
It is possible to sort results in Solr using any criteria you want and use the Solr score for a secondary sort. Some people thought that you were only able to use the Solr score as your primary sorting criteria.