You can use some dispatching mechanism, e.g.:
1. HTML: all your clickable elements have special class or attribute like
  <a class="widget chooser">chooser</a>
or
  <a data-widget-type="chooser">chooser</a>
2. JS: your single observer finds somehow your desired element and 
dispatches event accordingly to the special class of element ("chooser" in 
this sample) 
  var widgetType = element.readAttribute("data-widget-type") || "";
  if (widgetType && Widgets[widgetType]) {
    Widgets[widgetType].handleEvent(element);
  }

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