Expand/Collapse All

[Ciprian Daniel]

Hi everyone,

I wanted to implement a functionality of Expand/Collapse All. I had the property Expanded in the model which takes the value of true or false. I am changing the value of that property in the model but nothing happens on the interface.

Can you help me please? Can this functionality be implemented?

 

Thank you,

Cipri

[Ciprian Daniel]

Nevermind

I've tried to implement the functionality of Expand/Collapse All using the TreeList State and I succeeded. So no worries about this thread.

 

Best regards,

Cipri

[Jonathan]

If you are looking for the answer I provided one.  

public class MyTreeObject {
   public int Id { get; set; }
   public Something Stuff { get; set; }
   public IEnumerable<MyTreeObject> Children { get; set; }
}

 

        private void ExpandAll()
        {
            GridRef.State.ExpandedItems = new List<MyTreeObject>();
            var flatList = GridData?.Flatten(x => x.Children) ?? new List<MyTreeObject>();
            foreach(var child in flatList)
            {
                if(child.Children.Count > 0)
                {
                    GridRef.State.ExpandedItems.Add(child);
                }
            }
            GridRef.Rebind();
            StateHasChanged();
        }

And I borrow a Flatten method from StackOverflow here

 

[Hristian Stefanov]

Hello,

Thank you for sharing the approach here, publicly, so other developers dealing with the TreeList expansion can benefit from it.

Kind Regards,

Hristian