beforeCollapse

fires before collapsing a treegrid

beforeCollapse: (rowId: string | number) => boolean | void;

Parameters:

The callback of the event is called with the following parameter:

• rowId: string | number - the id of a collapsed row

Returns:

Return false to block collapsing of a treegrid; otherwise, true.

Example

treeGrid.events.on("beforeCollapse", (rowId) => {
    // your logic here
    return false;
});

Related sample: TreeGrid. Events

Change log:

added in v6.4