javascript - How can I close an overlay panel with the escape key -


i'm stuck trying close overlay panel pressing escape key.

i added cross button closes panel, need easier pressing "escape" key on keyboard.

html

<html>     <head>         <meta charset="utf-8" />         <title> business development </title>     </head>     <body>         <div class="overlay overlay-contentpush">             <button type="button" class="overlay-close">close</button>         </div>     </body> </html>

javascript

(function() {     var container = document.queryselector( 'div.container' ),         triggerbttn = document.getelementbyid( 'trigger-overlay' ),         overlay = document.queryselector( 'div.overlay' ),         closebttn = overlay.queryselector( 'button.overlay-close' );         transendeventnames = {             'webkittransition': 'webkittransitionend',             'moztransition': 'transitionend',             'otransition': 'otransitionend',             'mstransition': 'mstransitionend',             'transition': 'transitionend'         },         transendeventname = transendeventnames[ modernizr.prefixed( 'transition' ) ],         support = { transitions : modernizr.csstransitions };       function toggleoverlay() {         if( classie.has( overlay, 'open' ) ) {             classie.remove( overlay, 'open' );             classie.remove( container, 'overlay-open' );             classie.add( overlay, 'close' );             var onendtransitionfn = function( ev ) {                 if( support.transitions ) {                     if( ev.propertyname !== 'visibility' ) return;                     this.removeeventlistener( transendeventname, onendtransitionfn );                 }                 classie.remove( overlay, 'close' );             };             if( support.transitions ) {                 overlay.addeventlistener( transendeventname, onendtransitionfn );             }             else {                 onendtransitionfn();             }         }         else if( !classie.has( overlay, 'close' ) ) {             classie.add( overlay, 'open' );             classie.add( container, 'overlay-open' );         }     }      triggerbttn.addeventlistener( 'click', toggleoverlay );     closebttn.addeventlistener( 'click', toggleoverlay ); })(); 

$(document).bind('keydown',function(e){   if ( e.which == 27 ) {      console.log("escape key!");      // attach event here.   }; });

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