It is very strange.your code runs very well in jsfiddle,but in my demo page,it still have problem.
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Multiple ComboTree - jQuery EasyUI Demo</title>
<link rel="stylesheet" type="text/css" href="../../themes/default/easyui.css">
<script type="text/javascript" src="../../jquery.min.js"></script>
<script type="text/javascript" src="../../jquery.easyui.min.js"></script>
</head>
<body>
<input id="cc" style="width:400px"></input>
</body>
<script>
var data = [{
"id":1,
"text":"My Documents",
"children":[{
"id":11,
"text":"Photos",
"state":"closed",
"children":[{
"id":111,
"text":"Friend"
},{
"id":112,
"text":"Wife"
},{
"id":113,
"text":"Company"
}]
},{
"id":12,
"text":"Program Files",
"children":[{
"id":121,
"text":"Intel"
},{
"id":122,
"text":"Java",
"attributes":{
"p1":"Custom Attribute1",
"p2":"Custom Attribute2"
}
},{
"id":123,
"text":"Microsoft Office"
},{
"id":124,
"text":"Games"
}]
},{
"id":13,
"text":"index.html"
},{
"id":14,
"text":"about.html"
},{
"id":15,
"text":"welcome.html"
}]
}]
$('#cc').combotree({
data: data,
multiple: true,
cascadeCheck: false,
onClick: function(node){
clickNode($('#cc'), node.id);
},
onCheck: function(node, checked){
clickNode($('#cc'), node.id);
}
});
function clickNode(cc, id){
var opts = cc.combotree('options');
var values = cc.combotree('getValues');
var orderedValues = opts.orderedValues || [];
var node = cc.combotree('tree').tree('find', id);
if (node.checked){
orderedValues.push(String(node.id));
} else {
var index = $.inArray(String(node.id), orderedValues);
if (index >= 0){
orderedValues.splice(index, 1);
}
}
values.sort(function(a,b){
var i1 = $.inArray(a, orderedValues);
var i2 = $.inArray(b, orderedValues);
return i1<i2 ? -1 : 1;
});
opts.orderedValues = values;
cc.combotree('setValues', values);
}
</script>