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问题:

How do I track what position an element is when its position in a sortable list changes?

回答1:

You can use the ui object provided to the events, specifically you want the stop event, the ui.item property and .index(), like this:

$("#sortable").sortable({     stop: function(event, ui) {         alert("New position: " + ui.item.index());     } });

You can see a working demo here, remember the .index() value is zero-based, so you may want to +1 for display purposes.

回答2:

I wasn't quite sure where I would store the start position, so I want to elaborate on David Boikes comment. I found that I could store that variable in the ui.item object itself and retrieve it in the stop function as so:

$( "#sortable" ).sortable({     start: function(event, ui) {         ui.item.startPos = ui.item.index();     },     stop: function(event, ui) {         console.log("Start position: " + ui.item.startPos);         console.log("New position: " + ui.item.index());     } });