问题
Justin Bull's answer gets me part of the way. But I have an additional requirement which is not satisfied by Justin's answer.
Here is the setup:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<script type="text/javascript" src="http://www.google.com/jsapi"></script>
<script type="text/javascript">
google.load("jquery", "1.4.0");
google.load("jqueryui", "1.7.2");
google.setOnLoadCallback(OnLoad);
function OnLoad(){
var dropped = false;
$(".tag_cell").draggable({
addClasses: false,
revert: 'invalid',
containment: '#tagFun_div_main',
helper: 'clone',
appendTo: '#tagFun_div_helper',
start: function(event, ui) {
dropped = false;
$(this).addClass("hide");
},
stop: function(event, ui) {
if (dropped==true) {
$(this).remove();
} else {
$(this).removeClass("hide");
}
}
});
$("#tf_dropBox").droppable({
accept: '.tag_cell',
hoverClass: 'tf_dropBox_hover',
activeClass: 'tf_dropBox_active',
drop: function(event, ui) {
dropped = true;
$.ui.ddmanager.current.cancelHelperRemoval = true;
ui.helper.appendTo(this);
}
});
}
</script>
<style>
div#tagFun_div_main { display:block; width:400px; height:400px; margin:auto; padding:10px; background:#F00; }
div#tf_div_tagsReturn { display:block; width:200px; height:100%; float:left; overflow:auto; background:#000; }
div#tf_div_tagsDrop { display:block; width:200px; height:100%; float:right; background:#0F0; }
div#tf_dropBox { display:block; width:100%; height:250px; background:#F0F; }
span.tag_cell { display:block; width:25px; height:25px; margin:1px; float:left; cursor:pointer; background:#0FF; z-index:99; }
span.tag_cell.hide { display:none; }
div#tf_dropBox.tf_dropBox_hover { background:#FFF !important; }
div#tf_dropBox.tf_dropBox_active { background:#333; }
</style>
</head>
<body>
<div id="tagFun_div_main">
<div id="tf_div_tagsReturn">
<span class="tag_cell"></span>
<span class="tag_cell"></span>
<span class="tag_cell"></span>
<span class="tag_cell"></span>
<span class="tag_cell"></span>
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</div>
<div id="tf_div_tagsDrop">
<div id="tf_dropBox"></div>
</div>
</div>
<div id="tagFun_div_helper">
<!-- this is where the helper gets appended for temporary use -->
</div>
</body>
</html>
I just copied Justin's answer and added more span.tag_cells so that tf_div_tagsReturn would ACTUALLY overflow. Here's the Fiddle for the same: https://jsfiddle.net/sz1fg025/
I want the tag_cells to be draggable outside tf_div_tagsReturn (which already works), but I
ALSO want to be able to drag the tag_cells within tf_div_tagsReturn (eg as if to re-order them internally in tf_div_tagsReturn).
The problem is when you drag a cell down/up beyond the borders of tf_div_tagsReturn, it doesn't automatically scroll as the user might expect.
来源：https://stackoverflow.com/questions/54620373/jquery-ui-draggable-outside-div-but-not-within-it