nl_tokens: Listen to chart events to save selections into to state object .
pl_tokens: function synchronizeSelection ( options , configuration , watcher ) { if ( angular . isObject ( options . chart ) && angular . isObject ( options . chart . data ) && angular . isObject ( options . chart . data . selection ) && options . chart . data . selection . enabled === true ) { // add onselected listener configuration . data . onselected = function ( data , element ) { // check if listener is disabled currently if ( service . disableSelectionListener ) { return ; } // update state AngularChartWatcher . updateState ( watcher , function ( ) { createSelectionsPath ( options ) ; options . state . selected . push ( data ) ; } ) ; // call user defined callback if ( angular . isFunction ( <mask> . chart . data . onselected ) ) { AngularChartWatcher . applyFunction ( watcher , function ( ) { options . chart . data . onselected ( data , element ) ; } ) ; } } ; // add onunselection listener configuration . data . onunselected = function ( data , element ) { // check if listener is disabled currently if ( service . disableSelectionListener ) { return ; } // update state AngularChartWatcher . updateState ( watcher , function ( ) { createSelectionsPath ( options ) ; options . state . selected = options . state . selected . filter ( function ( selected ) { return selected . id !== data . id || selected . index !== data . index ; } ) ; } ) ; // call user defined callback if ( angular . isFunction ( options . chart . data . onunselected ) ) { AngularChartWatcher . applyFunction ( watcher , function ( ) { options . chart . data . onunselected ( data , element ) ; } ) ; } } ; } }