How to load nodes from API controller in Angular TreeView?
The TreeView control provides support to load nodes from API controller in Angular SPA on ASP.NET Core project. This can be achieved by loading tree nodes from controller using data manager, which then assigns the returned value in the tree view data source. Refer to the following code sample.
Typescript
export class HomeComponent {
public dataManager: any = new ej.DataManager({
url: "/api/SampleData",
crossDomain: true,
adaptor: new ej.WebApiAdaptor()
});
public fields: any;
constructor() {
this.fields = {
dataSource: this.dataManager,
id: "id", text: "name", parentId: "parentId", hasChild: "hasChild"
}
}
}
Load tree data in the API controller.
C#
public class SampleDataController : Controller {
[HttpGet]
public JsonResult Data()
{
List<treeData> treeData = new treeData().GetTreeData();
IEnumerable<treeData> results;
results = treeData;
return Json(results);
}
}
public class treeData {
public int id { get; set; }
public int? parentId { get; set; }
public string name { get; set; }
public bool? hasChild { get; set; }
public bool? expanded { get; set; }
public bool? ischecked { get; set; }
public bool? selected { get; set; }
public string spriteCss { get; set; }
public List<treeData> GetTreeData() {
List<treeData> data = new List<treeData>();
data.Add(new treeData { id = 1, name = "Local Disk(C:)", hasChild = true });
data.Add(new treeData { id = 2, name = "Local Disk(D:)", hasChild = true });
data.Add(new treeData { id = 3, name = "Local Disk(E:)", hasChild = true });
data.Add(new treeData { id = 4, parentId = 1, name = "Folder 1" });
data.Add(new treeData { id = 5, parentId = 1, name = "Folder 2" });
data.Add(new treeData { id = 6, parentId = 2, name = "Folder 3" });
data.Add(new treeData { id = 7, parentId = 2, name = "Folder 4" });
data.Add(new treeData { id = 8, parentId = 3, name = "Folder 5" });
data.Add(new treeData { id = 9, parentId = 3, name = "Folder 6" });
return data;
}
}
Final output
Sample:
https://www.syncfusion.com/downloads/support/directtrac/general/ze/treeview_loadnode_ng-558284384
Conclusion
I hope you enjoyed learning about how to load nodes from API controller in Angular TreeView.
You can refer to our Angular TreeView feature tour page to learn about its other groundbreaking feature representations and documentation, and how to quickly get started for configuration specifications. You can also explore our Angular TreeView example to understand how to create and manipulate data.
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