javascript - Close pop up on back button -


i want close pop on click of button mobile. implemented using onhashchange:

window.onhashchange = function (event) {  };

in case, if pop opened multiple times on click of button, opens , closes modal pop up. but, want modal pop close on first , navigate prev page on next back.

i tried using onbeforeunload, show alert leave or stay on page.

$(window).bind('beforeunload', function(e) {     return false; });

what best way close pop on button , redirect prev page on next back?

bootply.com down when testing answer. see inline script , comments @ bottom of code below. rest twitter bootstrap boilerplate test locally.

<!doctype html> <html lang="en">   <head>     <meta charset="utf-8">     <meta http-equiv="x-ua-compatible" content="ie=edge">     <meta name="viewport" content="width=device-width, initial-scale=1">     <title>modal.html</title>     <!-- bootstrap -->     <link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css" rel="stylesheet">     <!-- html5 shim , respond.js ie8 support of html5 elements , media queries -->     <!-- warning: respond.js doesn't work if view page via file:// -->     <!--[if lt ie 9]>       <script src="https://oss.maxcdn.com/html5shiv/3.7.2/html5shiv.min.js"></script>       <script src="https://oss.maxcdn.com/respond/1.4.2/respond.min.js"></script>     <![endif]-->   </head>   <body>     <p>if press button now, should return whatever page on before page.</p>     <button class="btn btn-primary btn-lg" data-toggle="modal" data-target="#mymodal">show me modal!</button>     <div class="modal fade" id="mymodal" tabindex="-1" role="dialog" aria-labelledby="mymodallabel" aria-hidden="true">       <div class="modal-dialog">         <div class="modal-content">           <div class="modal-header">             <button type="button" class="close" data-dismiss="modal"><span aria-hidden="true">&times;</span><span class="sr-only">close</span></button>             <h4 class="modal-title" id="mymodallabel">modal title</h4>           </div>           <div class="modal-body">             <p>if press web browser's button or modal's close buttons, modal close , hash return "modal.html#modalclosed".</p>           </div>           <div class="modal-footer">             <button type="button" class="btn btn-default" data-dismiss="modal">close</button>           </div>         </div>       </div>     </div>     <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>     <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.2.0/js/bootstrap.min.js"></script>      <script type="text/javascript">       // immutable hash state identifiers.        var closedmodalhashstateid = "#modalclosed";       var openmodalhashstateid = "#modalopen";        /* updating hash state creates new entry        * in web browser's history. latest entry in web browser's        * history "modal.html#modalclosed". */       window.location.hash = closedmodalhashstateid;        /* latest entry in web browser's history "modal.html#modalopen".        * entry before "modal.html#modalclosed". */       $('#mymodal').on('show.bs.modal', function(e) {         window.location.hash = openmodalhashstateid;       });          /* when user closes modal using twitter bootstrap ui,         * return previous entry in web         * browser's history, "modal.html#modalclosed". same thing        * happens when user clicks web browser's button. */       $('#mymodal').on('hide.bs.modal', function(e) {         window.history.back();       });           </script>   </body> </html>

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