TreeView parent stays indeterminate when all children were unchecked by outside function

1 Answer 99 Views

TreeView

Jacek asked on 15 Nov 2022, 01:14 PM

Here is the sample that shows what is the issue.
Just check any child and click "clear" button. The "full checks" are removed correctly, but indeterminate ones stays.

@* Enable the CheckParents parameter and observe the behavior of this setting. *@

<TelerikTreeView Data="@FlatData"
                 @bind-ExpandedItems="@ExpandedItems"
                 CheckParents="true"
                 CheckBoxMode="@TreeViewCheckBoxMode.Multiple"
                 @bind-CheckedItems="@checkedItems">
    <TreeViewBindings>
        <TreeViewBinding IdField="Id" ParentIdField="ParentIdValue" TextField="Text" HasChildrenField="HasChildren" IconField="Icon" />
    </TreeViewBindings>
</TelerikTreeView>

<div>
    Checked items:
    <ul>
        @if (checkedItems.Any())
        {
            foreach (var item in checkedItems)
            {
                var checkedItem = item as TreeItem;
                <li>
                    <span>
                        <TelerikIcon Icon="@checkedItem.Icon"></TelerikIcon>
                    </span>
                    <span>
                        @(checkedItem.Text)
                    </span>
                </li>
            }
        }
    </ul>
    <button @onclick="Clear">clear</button>
</div>


@code {
    public IEnumerable<object> checkedItems { get; set; } = new List<object>();

    public class TreeItem
    {
        public int Id { get; set; }
        public string Text { get; set; }
        public int? ParentIdValue { get; set; }
        public bool HasChildren { get; set; }
        public string Icon { get; set; }
    }

    public IEnumerable<TreeItem> FlatData { get; set; }
    public IEnumerable<object> ExpandedItems { get; set; } = new List<TreeItem>();

    protected override void OnInitialized()
    {
        LoadFlatData();
        ExpandedItems = FlatData.Where(x => x.HasChildren == true).ToList();
    }

private void Clear() {
    checkedItems = new List<object>();
        StateHasChanged();
}

    private void LoadFlatData()
    {
        List<TreeItem> items = new List<TreeItem>();

        items.Add(new TreeItem()
        {
            Id = 1,
            Text = "Project",
            ParentIdValue = null,
            HasChildren = true,
            Icon = "folder"
        });

        items.Add(new TreeItem()
        {
            Id = 2,
            Text = "Design",
            ParentIdValue = 1,
            HasChildren = true,
            Icon = "brush"
        });
        items.Add(new TreeItem()
        {
            Id = 3,
            Text = "Implementation",
            ParentIdValue = 1,
            HasChildren = true,
            Icon = "folder"
        });

        items.Add(new TreeItem()
        {
            Id = 4,
            Text = "site.psd",
            ParentIdValue = 2,
            HasChildren = false,
            Icon = "psd"
        });
        items.Add(new TreeItem()
        {
            Id = 5,
            Text = "index.js",
            ParentIdValue = 3,
            HasChildren = false,
            Icon = "js"
        });
        items.Add(new TreeItem()
        {
            Id = 6,
            Text = "index.html",
            ParentIdValue = 3,
            HasChildren = false,
            Icon = "html"
        });
        items.Add(new TreeItem()
        {
            Id = 7,
            Text = "styles.css",
            ParentIdValue = 3,
            HasChildren = false,
            Icon = "css"
        });

        FlatData = items;
    }
}

Am I doing something wrong?

TreeView parent stays indeterminate when all children were unchecked by outside function

1 Answer, 1 is accepted