在排序更改事件期间更新排序顺序-jQuery UI [英] Updating sort order during sort change event - jQuery UI

问题描述

我希望list元素的值成为排序事件期间排序位置的索引.

I want the value of the list element to be the index of the sorted position during sort event.

此值应在排序更改事件期间自动更新.

This value should update automatically during sort change event.

        <script type="text/javascript">
        $(function() {
            $('#sortable').sortable({
                start : function(event, ui) {
                    var start_pos = ui.item.index();
                    ui.item.data('start_pos', start_pos);
                },
                change : function(event, ui) {
                    var start_pos = ui.item.data('start_pos');
                    var index = ui.placeholder.index();

                    if (start_pos < index) {
                        $('#sortable li:nth-child(' + index + ')').html(index-2);
                    } else {
                        $('#sortable li:eq(' + (index + 1) + ')').html(index + 1);
                    }
                },
                update : function(event, ui) {
                    var index = ui.item.index();
                    $('#sortable li:nth-child(' + (index + 1) + ')').html(index);

                },
                axis : 'y'
            });
        });


    </script>

我制造了一个小提琴 http://jsfiddle.net/jagan2explore/4mcpq/

I created a fiddle http://jsfiddle.net/jagan2explore/4mcpq/

解释我的要求.

如果我将第1个元素移到第5个位置，则所有其他元素的值都会正确更新， 如果我将第5位移至第1位，则值会相应更新.

If i move 1'st element to 5th position all other elements values are updated rightly, If i move 5th to 1'st the value updates accordingly.

假设我将列表元素从1移到5&从5到2而没有离开(在single sort event期间)，则不会相应更新值.

Suppose if i move a list element from 1 to 5 & from 5 to 2 without leaving (during single sort event ), the values are not updated accordingly.

我错过了什么吗?

任何帮助将不胜感激.预先感谢

Any help would be greatly appreciated. Thanks in advance

推荐答案

尝试一下:

update : function(event, ui) {
    var index = ui.item.index();
    var start_pos = ui.item.data('start_pos');

    //update the html of the moved item to the current index
    $('#sortable li:nth-child(' + (index + 1) + ')').html(index);

    if (start_pos < index) {
        //update the items before the re-ordered item
        for(var i=index; i > 0; i--){
            $('#sortable li:nth-child(' + i + ')').html(i - 1);
        }
    }else {
        //update the items after the re-ordered item
        for(var i=index+2;i <= $("#sortable li").length; i++){
            $('#sortable li:nth-child(' + i + ')').html(i-1);
        }
    }
},

演示: jsfiddle

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