DxTreeView.SetNodesChecked(Func<ITreeViewNodeInfo, Boolean>, Boolean) Method

Checks or unchecks the specified nodes.

Namespace: DevExpress.Blazor

Assembly: DevExpress.Blazor.v23.2.dll

NuGet Package: DevExpress.Blazor

Declaration

public void SetNodesChecked(
    Func<ITreeViewNodeInfo, bool> predicate,
    bool check
)

Parameters

Name	Type	Description
predicate	Func<ITreeViewNodeInfo, Boolean>	A method delegate that specifies particular nodes.
check	Boolean	true to check nodes; false to uncheck nodes.

Remarks

Use the SetNodesChecked method to check or uncheck the specified nodes in code.

The code below expands the specified node and checks all its child nodes:

Razor

@using TreeView.Data

<DxTreeView @ref="MyTreeView"
            Data=@DataFlatSource.DataFlat
            CheckMode="TreeViewCheckMode.Multiple">
    <DataMappings>
        <DxTreeViewDataMapping Text="Product"
                               Key="Id"
                               ParentKey="ParentId" />
    </DataMappings>
</DxTreeView>

@code {
    DxTreeView MyTreeView;

    protected override void OnAfterRender(bool firstRender) {
        base.OnAfterRender(firstRender);
        if(firstRender) {
            MyTreeView.SetNodeExpanded(n => n.Text == "Clothing", true);
            MyTreeView.SetNodesChecked(n => n.Parent?.Text == "Clothing", true);
        }
    }
}

DataFlatSource.cs

namespace TreeView.Data {
    public class DataFlatSource {
        public class ProductFlat {
            public string Product { get; set; }
            public int Id { get; set; }
            public int ParentId { get; set; }
        }
        public static IEnumerable<ProductFlat> DataFlat => new List<ProductFlat>() {
            new ProductFlat () { Product = "Bikes", Id = 1 },
            new ProductFlat () { Product = "Components", Id = 2 },
            new ProductFlat () { Product = "Clothing", Id = 3 },
            new ProductFlat () { Product = "Mountain Bikes", Id = 4, ParentId = 1 },
            new ProductFlat () { Product = "Road Bikes", Id = 5, ParentId = 1 },
            new ProductFlat () { Product = "Touring", Id = 6, ParentId = 1 },
            new ProductFlat () { Product = "Handlebars", Id = 7, ParentId = 2 },
            new ProductFlat () { Product = "Bottom Brackets", Id = 8, ParentId = 2 },
            new ProductFlat () { Product = "Brakes", Id = 9, ParentId = 2 },
            new ProductFlat () { Product = "Chains", Id = 10, ParentId = 2 },
            new ProductFlat () { Product = "Bib-Shorts", Id = 11, ParentId = 3 },
            new ProductFlat () { Product = "Gaps", Id = 12, ParentId = 3 },
            new ProductFlat () { Product = "Gloves", Id = 13, ParentId = 3 },
        };
    }
}