Capture delete action

[JuanMaGMZG]

I want to capture the event of deleting what I have selected (either link or node), but I do not know if there is already a function for it or I have to do it.

diagram.KeyDown += (e) =>
{
if (e.Key == "Delete")
{
e.preventDefault();
}
};

I tried the diagram.keydown when I press Delete, but e.preventDefault does not exist.

Do you have any suggestions?

Thx 4 all

[zHaytam]

Do you want to cancel a deletion based on some condition?

[JuanMaGMZG]

I want to offer you a "confirm" and if you answer no, do not delete the selected item

[JuanMaGMZG]

if it serves you, what I did was remove the shortcut to delete and in the KeyDown event, get the selected link or the node if it is a node that is selected

var ksb = diagram.GetBehavior<KeyboardShortcutsBehavior>();
ksb.RemoveShortcut("Delete", ctrl: false, shift: false, alt: false);

diagram.KeyDown += async (e) =>
{
    if (e.Key == "Delete")
    {
        //Only for links
        var linkToDelete = diagram.Links.FirstOrDefault(link => link.Selected);
        if (linkToDelete != null)
           await HandleDeleteLink(linkToDelete);
    }
};

[ATEEKGIT]

if you want to control deletion of nodes etc. just use the constaint , like below

// add constrain in option and attach your method which will be called
var options = new BlazorDiagramOptions
{
Constraints =
{
ShouldDeleteNode = IsDeleteAllowed
}

// then implement method like this.
public async ValueTask IsDeleteAllowed(NodeModel DNode)
{
var xnode = DNode as TaskNodeModel;
if (xnode.NodeStep.step_type == StepType.Start || xnode.NodeStep.step_type == StepType.End)
return false;
else
return true;

}

this function control which type of node can be deleted and which can't .