TreeListBase.ExpansionChanging

Syntax

ExpansionChanging: function(sender, args);

Parameters

sender. Event source.

args. Event information:

Value. Boolean. Expander state.
Node. String. Node identifier.
Cancel. Boolean. If this property is set to true in the event handler, expander is not changed.

Description

The ExpansionChanging event occurs before changing expander value.

Example

Executing the example requires the SimpleTreeList component with the Tree identifier (see Example of Creating the SimpleTreeList Component).

// Set event
Tree.ExpansionChanging.add( function(sender, args) {
  console.log("ExpansionChanging event:");
  console.log(args);
});
// Initialize event
Tree.setNodeExpanded(0, true);

After executing the example the ExpansionChanging event is added.