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<!doctype html> <html> <head> <title>test</title> <meta charset="UTF-8"> <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js"></script> <script> $(document).ready(function() { $('#main_body').append("<h1>Hello</h1><input id=\"but\" type=\"button\">Click"); $("#but").on("click", function() { alert("bla bla"); }); }); </script> </head> <body id="main_body"></body> </html>Why alert doesn't work after append DOM? Should shows "bla bla" after click on it.
SOLVED
Main problem was with it:
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js"></script> jquery was too old I think
<script src="http://code.jquery.com/jquery-1.11.0.min.js"></script> solved problem :)
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For dynamically added elements you need event delegation, use the other version on jQuery on(), you can delegate event to static parent of the dynamically added elements. In your case you can use #main_body
$('#main_body').on( "click", "#but", function() { alert( "bla bla" ); }); Delegated events have the advantage that they can process events from descendant elements that are added to the document at a later time. By picking an element that is guaranteed to be present at the time the delegated event handler is attached, you can use delegated events to avoid the need to frequently attach and remove event handlers, jQuery Docs
Your code works here as it is because you are adding the dynamically element before binding the event but using event delegation will free you from the sequence you use to add the dynamic elements.
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You need to use event delegation for dynamically added element.
$(document).ready(function() { $('#main_body').append("<h1>Hello</h1><input id=\"but\" type=\"button\">Click"); $('#main_body').on('click', '#but', function() { alert( "bla bla" ); }); }); Event delegation allows us to attach a single event listener, to a parent element, that will fire for all children matching a selector, whether those children exist now or are added in the future
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