因此,我试图制作一个时间表,可以将讲义从一个单元拖到另一个单元中,除非新的单元已经有一个讲义,在这种情况下,将被拒绝。我正在尝试通过从单元格中添加和删除类“ has_lecture”来表明是否应该允许将单元格移入或移出来进行此操作。这是我的代码..但是由于某种原因,删除类不起作用。
$(".draggable").draggable({
revert: 'invalid'
});
$(".droppable").droppable({
accept: function () {
return (!$(this).hasClass('has_lecture'))
},
drop: function (event, ui) {
var $this = $(this);
ui.draggable.position({
my: "center",
at: "center",
of: $this,
using: function (pos) {
$(this).animate(pos, 200, "linear");
}
});
$(this).addClass('has_lecture')
},
out: function () {
// this line doesn't work
$(this).removeClass('has_lecture')
}
});
每当可拖动对象移动到可放置对象上方时,accept函数就会运行。这意味着它将检查何时拖入,并且还会检查何时拖出。将其放入并设置has_lecture
类后,您的accept函数将在尝试将其拖出时运行,并且由于它具有has_lecture
该类,因此它始终返回false,并且永远不会给您的out
函数运行的机会。
因此,知道了这种意外行为后,您的想法是:如果放置区为空,则只有在没有has_lecture类的情况下才应接受。但是,如果dropzone不为空,则应该继续接受其中的当前元素。这样可以将其拖出。因此,将元素拖到放置区后,通过将其对引用存储在放置区上$(this).data('dropped', ui.draggable)
,现在您的accept函数可以检查您要拖入或拖出的元素是否已被拖入。 。
(添加了HTML和CSS,因此该代码段将运行)
$(function () {
$(".draggable").draggable({
// revert: 'invalid'
});
$(".droppable").droppable({
accept: function (draggable) {
// new code: new accept clause, accept is not has_lecture OR if the element already dragged onto it is the one you are attempting to drag out
return (!$(this).hasClass('has_lecture') || $(this).data('dropped') && $(this).data('dropped').is(draggable))
},
drop: function (event, ui) {
var $this = $(this); // << your existing code
ui.draggable.position({ // << your existing code
my: "center", // << your existing code
at: "center", // << your existing code
of: $this, // << your existing code
using: function (pos) { // << your existing code
$(this).animate(pos, 200, "linear"); // << your existing code
} // << your existing code
}); // << your existing code
$this.addClass('has_lecture'); // << your existing code
// new code: store a reference to the dropped element on the drop zone
$this.data('dropped', ui.draggable)
},
out: function () {
$(this).removeClass('has_lecture'); // << your existing code
// new code: once you have moved it out, then delete the reference to it since your drop zone is now empty again
$(this).data('dropped', null);
}
});
});
.draggable {
width: 90px;
height: 90px;
padding: 0.5em;
float: left;
margin: 10px 10px 10px 0;
border: 1px solid black;
}
.droppable {
width: 120px;
height: 120px;
padding: 0.5em;
float: left;
margin: 10px;
border: 1px solid black;
}
h3 {
clear: left;
}
.has_lecture {
background-color: blue;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.12.1/jquery.min.js"></script>
<script src="https://code.jquery.com/ui/1.12.1/jquery-ui.js"></script>
<div class="draggable" class="ui-widget-content">
<p>Drag me to my target</p>
</div>
<div class="draggable" class="ui-widget-content">
<p>Drag me to my target</p>
</div>
<div class="draggable" class="ui-widget-content">
<p>Drag me to my target</p>
</div>
<div class="droppable" class="ui-widget-header">
<p>Drop here</p>
</div>
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