The following events are available in dhtmlxCombo:

• onChange - fires when the combo's value changed;
• onSelectionChange - fires when the preselected value inside combo changes ( it differs from onChange event, because previous one occurs only when value really changed);
• onKeyPressed -fires right after the key is pressed inside combo;
• onBlur - fires when the focus is moved out from the combo;
• onOpen - fires when the combo list opens;
• onDynXLS - fires when the combo list is being populated with data from the server;
• onCheck -fires when a checkbox is clicked.

The user can add any user-defined handler to any of the available events. To do this, the user can use attachEvent() method with the following parameters:

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

        combo.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-sensitive.

There is a simple way of removing an event-handler:

        combo.detachEvent(id); // unique id of the event handler