One way is to create a custom helper with the selected items, hide the items while dragging and manually append the selected items upon receive.
Here’s my attempt:
css
.selected {
background:red !important;
}
.hidden {
display:none;
}
script:
$('.droptrue').on('click', 'li', function () {
$(this).toggleClass('selected');
});
$("ul.droptrue").sortable({
connectWith: 'ul.droptrue',
opacity: 0.6,
revert: true,
helper: function (e, item) { //create custom helper
if(!item.hasClass('selected'))
item.addClass('selected');
// clone selected items before hiding
var elements = $('.selected').not('.ui-sortable-placeholder').clone();
//hide selected items
item.siblings('.selected').addClass('hidden');
var helper = $('<ul/>');
return helper.append(elements);
},
start: function (e, ui) {
var elements = ui.item.siblings('.selected.hidden').not('.ui-sortable-placeholder');
//store the selected items to item being dragged
ui.item.data('items', elements);
},
receive: function (e, ui) {
//manually add the selected items before the one actually being dragged
ui.item.before(ui.item.data('items'));
},
stop: function (e, ui) {
//show the selected items after the operation
ui.item.siblings('.selected').removeClass('hidden');
//unselect since the operation is complete
$('.selected').removeClass('selected');
},
update: updatePostOrder
});
$(function () {
$('.droptrue').on('click', 'li', function () {
$(this).toggleClass('selected');
});
$("ul.droptrue").sortable({
connectWith: 'ul.droptrue',
opacity: 0.6,
revert: true,
helper: function (e, item) {
console.log('parent-helper');
console.log(item);
if(!item.hasClass('selected'))
item.addClass('selected');
var elements = $('.selected').not('.ui-sortable-placeholder').clone();
var helper = $('<ul/>');
item.siblings('.selected').addClass('hidden');
return helper.append(elements);
},
start: function (e, ui) {
var elements = ui.item.siblings('.selected.hidden').not('.ui-sortable-placeholder');
ui.item.data('items', elements);
},
receive: function (e, ui) {
ui.item.before(ui.item.data('items'));
},
stop: function (e, ui) {
ui.item.siblings('.selected').removeClass('hidden');
$('.selected').removeClass('selected');
},
update: updatePostOrder
});
$("#sortable1, #sortable2").disableSelection();
$("#sortable1, #sortable2").css('minHeight', $("#sortable1").height() + "px");
updatePostOrder();
});
function updatePostOrder() {
var arr = [];
$("#sortable2 li").each(function () {
arr.push($(this).attr('id'));
});
$('#postOrder').val(arr.join(','));
}.listBlock {
float: left;
}
#sortable1, #sortable2 {
list-style-type: none;
margin: 0;
padding: 0;
margin-right: 100px;
background: #eee;
padding: 5px;
width: 300px;
border: 1px solid black;
}
#sortable1 li, #sortable2 li {
color:black;
cursor: move;
margin: 5px;
padding: 5px;
font-size: 1.2em;
width: 250px;
background: none;
background-color: white;
}
.selected {
background:red !important;
}
.hidden {
display:none !important;
}
ul {
list-style-type: none;
}<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="http://code.jquery.com/ui/1.9.2/jquery-ui.js"></script>
<div id="maincontainer">
<div id="navtoplistline"> </div>
<div id="contentwrapper">
<div id="maincolumn">
<div class="text">
<hr />
<div class="listBlock">
<h2>Available</h2>
<ul id="sortable1" class="droptrue">
<li id="article_1">Article #1</li>
<li id="article_2">Article #2</li>
<li id="article_3">Article #3</li>
</ul>
</div>
<div class="listBlock">
<h2>My Articles</h2>
<ul id="sortable2" class="droptrue"></ul>
</div>
<br clear="both" />
<p>Which articles, in which order?:
<br />
<input type="text" id="postOrder" name="postOrder" value="" size="30" />
</p>
</div>
</div>
</div>
</div>