models
public class City
{
public int Id { get; set; }
public string Name { get; set; }
public int StateId { get; set; }
public virtual State State { get; set; }
}
public class State
{
public int Id { get; set; }
public string Title { get; set; }
public virtual List<City> City { get; set; }
}
public class TreeViewNode
{
public string id { get; set; }
public string parent { get; set; }
public string text { get; set; }
}
Controller Code
[HttpGet]public IActionResult Index()
{
List<TreeViewNode> nodes = new List<TreeViewNode>();
//Loop and add the Parent Nodes.
foreach (State type in _context.State)
{
nodes.Add(new TreeViewNode { id = type.Id.ToString(), parent = "#", text = type.Title });
}
//Loop and add the Child Nodes.
foreach (City subType in _context.City)
{
nodes.Add(new TreeViewNode { id = subType.StateId.ToString() + "-" + subType.Id.ToString(), parent = subType.StateId.ToString(), text = subType.Name });
}
//Serialize to JSON string.
ViewBag.Json = JsonConvert.SerializeObject(nodes);
return View();
}
[HttpPost]
public ActionResult Index(string selectedItems)
{
List<TreeViewNode> items = JsonConvert.DeserializeObject<List<TreeViewNode>>(selectedItems);
return RedirectToAction("Index");
}
cshtml file
<div id="jstree">
</div>
@using (Html.BeginForm("Index", "Home", FormMethod.Post))
{
<input type="hidden" name="selectedItems" id="selectedItems" />
<input type="submit" value="Submit" />
}
@section scripts{
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/jstree/3.2.1/themes/default/style.min.css" />
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.12.1/jquery.min.js"></script>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jstree/3.2.1/jstree.min.js"></script>
<script type="text/javascript">
$(function () {
$('#jstree').on('changed.jstree', function (e, data) {
var i, j;
var postedItems = [];
for(i = 0, j = data.selected.length; i < j; i++) {
//Fetch the Id.
var id = data.selected[i];
//Remove the ParentId.
if(id.indexOf('-') != -1){
id = id.split("-")[1];
}
//Add the Node to the JSON Array.
postedItems.push({
text: data.instance.get_node(data.selected[i]).text,
id: id,
parent: data.node.parents[0]
});
}
//Serialize the JSON Array and save in HiddenField.
$('#selectedItems').val(JSON.stringify(postedItems));
}).jstree({
"core": {
"themes": {
"variant": "large"
},
"data": @Html.Raw(ViewBag.Json)
},
"checkbox": {
"keep_selected_style": false
},
"plugins": ["wholerow", "checkbox"],
});
});
</script>
}