check if div contains an element in jQuery

问题

I'm bulding some drag and drop widgets in jQuery, once they've been dropped I need to check if my drag and droppable widget are inside another div.

<div id="droptarget">
    <div class="widget">I'm a widget!</div>
</div>

I've had a look at $('#droptarget').each but can't seem to figure it out. Any ideas?

回答1:

If you want to select the outer div:

$("#droptarget:has(div.widget)")

If you want to select the widget:

$("#droptarget > div.widget")

回答2:

I would start with

if ($ ('#droptarget .widget')) {
  // do something
}

来源：https://stackoverflow.com/questions/892329/check-if-div-contains-an-element-in-jquery