The checked property is designed for multiple selections. When you set the multiple to false, the checked property is ignored. If you want to initialize the combotree value, please set the value property for the combotree component.

but which item need to be selected is returned with the json data.

my solution is find the selected item in the onLoadSuccess event
then setValue.

Code:

<input class="easyui-combotree" data-options="url:'tree_data1.json',method:'get',required:true, multiple:false" style="width:200px;">

Code:

[{
	"id":1,
	"text":"My Documents",
	"state":"open",
	"children":[{
		"id":11,
		"text":"Photos",
		"state":"open",
		"children":[{
			"id":111,
			"text":"Friend",
			"checked":true
		},{
			"id":112,
			"text":"Wife"
		},{
			"id":113,
			"text":"Company"
		}]
	}]
}]