javascript - Make Dropdown close on selection? -

i trying dropdown menu close after makes selection within dropdown. here javascript code horizontal dropdown..

;( function( window ) {      'use strict';      var document = window.document;      function extend( a, b ) {         for( var key in b ) {              if( b.hasownproperty( key ) ) {                 a[key] = b[key];             }         }         return a;     }      function cbphorizontalslideoutmenu( el, options ) {          this.el = el;         this.options = extend( this.defaults, options );         this._init();     }      cbphorizontalslideoutmenu.prototype = {         defaults : {},         _init : function() {             this.current = -1;             this.touch = modernizr.touch;             this.menu = this.el.queryselector( '.cbp-hsmenu' );             this.menuitems = this.el.queryselectorall( '.cbp-hsmenu > li' );             this.menubg = document.createelement( 'div' );             this.menubg.classname = 'cbp-hsmenubg';             this.el.appendchild( this.menubg );             this._initevents();         },         _openmenu : function( el, ev ) {              var self = this,                 item = el.parentnode,                 items = array.prototype.slice.call( this.menuitems ),                 submenu = item.queryselector( '.cbp-hssubmenu' ),                 closecurrent = function( current ) {                     var current = current || self.menuitems[ self.current ];                     current.classname = '';                     current.setattribute( 'data-open', '' );                     },                 closepanel = function() {                     self.current = -1;                     self.menubg.style.height = '0px';                 };              if( submenu ) {                  ev.preventdefault();                  if( item.getattribute( 'data-open' ) === 'open' ) {                     closecurrent( item );                     closepanel();                 }                 else {                     item.setattribute( 'data-open', 'open' );                     if( self.current !== -1 ) {                         closecurrent();                         closepanel();                     }                     self.current = items.indexof( item );                     item.classname = 'cbp-hsitem-open';                     self.menubg.style.height = submenu.offsetheight + 'px';                 }             }             else {                 if( self.current !== -1 ) {                     closecurrent();                     closepanel();                 }             }          },         _initevents : function() {              var self = this;              array.prototype.slice.call( this.menuitems ).foreach( function( el, ) {                 var trigger = el.queryselector( 'a' );                 if( self.touch ) {                     trigger.addeventlistener( 'touchstart', function( ev ) { self._closemenu( this, ev ); } );                 }                 else {                     trigger.addeventlistener( 'click', function( ev ) { self._closemenu( this, ev ); } );                    }             } );              window.addeventlistener( 'resize', function( ev ) { self._resizehandler(); } );          },         // taken https://github.com/desandro/vanilla-masonry/blob/master/masonry.js david desandro         // original debounce john hann         // http://unscriptable.com/index.php/2009/03/20/debouncing-javascript-methods/         _resizehandler : function() {             var self = this;             function delayed() {                 self._resize();                 self._resizetimeout = null;             }              if ( this._resizetimeout ) {                 cleartimeout( this._resizetimeout );             }              this._resizetimeout = settimeout( delayed, 50 );         },         _resize : function() {             if( this.current !== -1 ) {                 this.menubg.style.height = this.menuitems[ this.current ].queryselector( '.cbp-hssubmenu' ).offsetheight + 'px';             }         }     }      // add global namespace     window.cbphorizontalslideoutmenu = cbphorizontalslideoutmenu;  } )( window ); 

if please me out great.