如何检查jQuery UI插件是否附加到元素？

问题描述

如何检查jQuery UI插件是否附加到元素？例如，如果我加载.sortable小部件，它的存在如何确定？

How can I check to see if a jQuery UI plugin is attached to an element? For example, if I load up the .sortable widget, how can its presence be determined?

这个问题背后的目的是我希望能够切换.sortable在元素上。由于能够看到.sortable存在，我可以调用.sortable（'destroy'）将其删除。

The purpose behind this question is that I would like the ability to toggle .sortable on elements. With the ability to see that .sortable is present, I could then call .sortable('destroy') to remove it.

推荐答案

所有ui小部件都将其名称作为true附加到元素的容器数据中。 jqueryui还添加了一个数据过滤器表达式。

All ui widgets attach their name as true to the element's container data. jqueryui also adds a data filter expression.

var $elem = $('div.sortable-container:data(sortable)');
if ($elem.length){
  // $elem contains list of elements that have sortable widget attached
}

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