Element click handling in cytoscape.js

gistfile1.js

cy.on('click', function(event){
    // cyTarget holds a reference to the originator
    // of the event (core or element)
    var evtTarget = event.cyTarget;
    window.evtTarget = evtTarget;
    if( evtTarget === cy ){
        console.log('click on background');
    } else {

      console.log('click on some element');
      console.log("clicked on " + evtTarget.data("id"));
    }
  });