onFocus of ui.toggle, Events Webix Docs

fires when a view gets focus

void onFocus(object current_view,object prev_view);

current_view

objectthe view that is in focus now prev_view

objectthe view that has previously been in focus

$$("datatable1").attachEvent("onFocus", function(current_view, prev_view){
    // current_view is the datatable in question
});