javascript - jQuery event doesn't work at new created element -

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i take img element class ".follow", hide , replace new created element button class ".followbutton". after "mouseout" event take new created button element, hide , replace new created img element class ".follow". have new element img same atributes initially. "mouseenter" doesn't work. , don't figure out why.

$(".follow")      .on("mouseenter", function() {          $(this).fadeout(150, function() {              var init = this;              var btn = document.createelement("button");              var t = document.createtextnode("follow");              btn.appendchild(t);              btn.classname = "followbutton";              $(btn).hide();              $(this).replacewith(btn);              $(".followbutton").show(150);              $(".followbutton").on("mouseout", function() {                  var imgback = $("<img />", {                     class: "follow",                     src: "img/remove.png",                  }).hide();                  $(this).hide(150);                  $(this).replacewith(imgback);                  $(".follow").show(150);              });          });      });
<!doctype html>  <html>  <head>    <meta charset="utf-8">     <link rel="stylesheet" type="text/css" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">    <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.1.0/jquery.min.js"></script>    <script type="text/javascript" src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>    <script type="text/javascript" src="script.js"></script>  	<title>follow</title>  </head>  <body>        <img src="img/remove.png" class="follow">      </body>  </html>

because lost listener on .follow when creating new img tag , replace document. have use event delegation instead.

$(document).on("mouseenter", ".follow", function() { /* ... */ }); 

$(document).on("mouseenter", ".follow", function() {          $(this).fadeout(150, function() {              var init = this;              var btn = document.createelement("button");              var t = document.createtextnode("follow");              btn.appendchild(t);              btn.classname = "followbutton";              $(btn).hide();              $(this).replacewith(btn);              $(".followbutton").show(150);              $(".followbutton").on("mouseout", function() {                  var imgback = $("<img />", {                     class: "follow",                     src: "img/remove.png",                  }).hide();                  $(this).hide(150);                  $(this).replacewith(imgback);                  $(".follow").show(150);              });          });      });
<!doctype html>  <html>  <head>    <meta charset="utf-8">     <link rel="stylesheet" type="text/css" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">    <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.1.0/jquery.min.js"></script>    <script type="text/javascript" src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>    <script type="text/javascript" src="script.js"></script>  	<title>follow</title>  </head>  <body>        <img src="img/remove.png" class="follow">      </body>  </html>


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