# dhtmlxtree:api_method_dhtmlxtreeobject_attachevent [DHX documentation]

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### attachEvent(evName, evHandler)

Required library edition:
Required library file: dhtmlxtree.js

adds any user-defined handler to available events

- evName - name of the event;
- evHandler - user-defined event handler.

                   tree.attachEvent(evName, evHandler);

Several handlers can be attached to one and the same event, and all of them will be executed.

Note: the names of the events are case-insensitive.