Jquery sortable element should move only up-down not left or right -

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i using jquery sortable function li within ul tag, when dragging , dropping elements within ul, wanting can not dragged left or right within ul. should dragged , down.

try this:

$( ".selector" ).sortable({ axis: 'y' });

from docs:

if defined, items can dragged horizontally or vertically. possible values:'x', 'y'.


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