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onmousedown doesn't callback after changing class dynamically

I have the following divs:
<div class="celula" id="838">
</div>
<div class="celula" id="839">
</div>
<div class="celula" id="840">
</div>
I change them dynamically using jquery with an ajax response so far it works great.
Imagine that it generates the following:
<div class="checked" id="838">
</div>
<div class="checked" id="839">
</div>
<div class="checked" id="840">
</div>
Complete js callback:
$(document).ready(function () {
document.getElementById("templatenome").innerHTML = screen.width + " - " + screen.height;
$('.celula').on('mousedown', function(){
var template = $("#templatenome").attr("name");
var $div = document.getElementById (this.id);
$div.style.backgroundImage = "url('../../resources/"+template+"/images/CelulaPOP.png')";
var audio = document.getElementById("audio");
audio.play();
$(document).one('mouseup', function(){
sendAjax($div.id);
$div.style.backgroundImage = "url('../../resources/"+template+"/images/CelulaSEL.png')";
});
});
$(document).on('mousedown', '.checked', function(){
$(document).one('mouseup', function(){
});
});
});

Use a delegated event handler, attached to a non-changing ancestor of the dynamic elements:
$(document).on('mousedown', '.checked', function(){
$(document).one('mouseup', function(){
alert("I was mouse-uppped on a .checked div!");
});
});
As you do not want the previous handler to operate once the class is changed (see comments below), make that a delegated handler too:
e.g.
$(document).on('mousedown', '.celula', function(){
This applies the jQuery selector at event time only, so the elements only need to match then (and not when the event was registered).
document is the best default if nothing closer is available/convenient. Do not use 'body' as it has a bug (if styling results in a calculated body height of 0 it will not bubble mouse events to body)
Here is a little demo showing how events will fire with the delegated event handlers as the classes are changed:
JSFiddle: http://jsfiddle.net/TrueBlueAussie/5xb6vohp/3/

bpopup multiple

I'm using a lightweight jQuery popup plugin called 'bPopup'. I'm using it on my website at the moment to load multiple popup windows when clicked. I was recently told that my code was inefficient as I was loading multiple popups with multiple JavaScript 'listeners', i.e.:
<script type="text/javascript">
;(function($) {
$(function() {
$('#my-button_1').bind('click', function(e) {
e.preventDefault();
$('#element_to_pop_up_32754925023').bPopup();
});
});
})(jQuery);
</script>
<script type="text/javascript">
;(function($) {
$(function() {
$('#my-button_2').bind('click', function(e) {
e.preventDefault();
$('#element_to_pop_up_95031153149').bPopup();
});
});
})(jQuery);
^^ The multiple JavaScript 'listeners'. And, for the Popups:
<!-- Button that triggers the popup -->
<a class="main" id="my-button_1" href="#">Popup 1</a></b><br />
<!-- Element to pop up -->
<div id="element_to_pop_up_1">
// ...
</div>
<!-- Button that triggers the popup -->
<a class="main" id="my-button_1" href="#">Popup 1</a></b><br />
<!-- Element to pop up -->
<div id="element_to_pop_up_1">
// ...
</div>
He's probably right (sure of it), but not sure how to implement this, or whether this is even possible (small chance he's wrong).
Help? And thanks!

Since you are using jquery, you should use it's on() method to attach a single listener to the parent DOM element, and use the selector parameter to properly delegate the event to it's children (the button/popups).
If this sounds confusing, a simple example might help:
HTML:
<div id="parent">
Show popup 1
<div id="popup1" class="popup">1</div>
Show popup 2
<div id="popup2" class="popup">2</div>
Show popup 3
<div id="popup3" class="popup">3</div>
Non-popup link
</div>
JS:
$('#parent').on('click', 'a.button', function (event) {
event.stopPropagation();
event.preventDefault();
var popup = $(this).attr('href');
$('#'+popup).bPopup();
});
This adds a single event listener on the parent element, which only gets triggered if the child element which triggered the event matches the selector (in this case a.button). It determines which popup to show by retreiving the popup's id from the href attribute.
You can see this example working here.

The below function ( myFunction() ) takes the Id of anchor/div tag which is clicked and another id of div content to be display. And applies the same style for all popup models. And also it hides the old popup which already opened when u open new popup. All popup properties you can change.
Here i used only for two popups but you can use it for many as same did here.
<script type="text/javascript">
function myFunction(whId,whtDivContent,e) {
//var totWidth = $(document).width();
//var marTop = position.top;
var elt = $(whId);
var position = elt.position();
var marLeft = position.left - 130;
if(marLeft <= 1) {
marLeft = 10;
}
var openModal_profile ='#openModal_profile';
var openModal_menu ='#openModal_menu';
// Prevents the default action to be triggered.
e.preventDefault();
$(whtDivContent).bPopup({
position: [marLeft, 0] //x, y
,opacity: 0.9
,closeClass : 'b-close'
,zIndex: 2
,positionStyle: 'fixed' //'fixed' or 'absolute' 'relative'
,follow: [false,false] //x, y
,onOpen: function() {
if(openModal_profile == whtDivContent) {
$(openModal_menu).bPopup().close();
}
else if(openModal_menu == whtDivContent) {
$(openModal_profile).bPopup().close();
}
$(whId).css({'background-color':"#DFDFDF"});
}
,onClose: function() { $('.close').click(); $(whId).css({'background-color':""}); }
});
}
;(function($) {
// DOM Ready
$(function() {
// From jQuery v.1.7.0 use .on() instead of .bind()
//$(id_menu).on('click',function(e) {}
var id_menu = '#id_menu';
var openModal_menu ='#openModal_menu';
$(id_menu).toggle(function(e) {
//$(id_menu).css({'background-color':"#DFDFDF"});
myFunction(id_menu,openModal_menu,e);
},function(e){
//$(id_menu).css({'background-color':""});
$('.close').click();
$(openModal_menu).bPopup().close();
});
var id_profile = '#id_profile';
var openModal_profile ='#openModal_profile';
$(id_profile).toggle(function(e) {
//$(id_profile).css({'background-color':"#DFDFDF"});
myFunction(id_profile,openModal_profile,e);
},function(e){
//$(id_profile).css({'background-color':""});
$(openModal_profile).bPopup().close();
});
//ENDS HERE
});
})(jQuery);
</script>

jQuery click dynamic element

See the code's comment:
$.each($('input[type="radio"]'), function(){
var input = $(this);
var container = $('<div class="radio"></div>');
var mark = $('<span />');
input.wrap(container).after(mark);
container.click(function(){
alert('test'); // Not triggered.
});
});
The html is:
<input type="radio" value="female" name="gender" />
Anyone know why the alert is not triggered when clicked, and yes it is visible in CSS. When I use :
console.log(container);
It does give me the HTML it is containing.
Thanks

$('body').on('click', 'div.radio', function() {
});
Full Code
$('body').on('click', 'div.radio', function() {
alert('test');
});
$.each($('input[type="radio"]'), function(){
var input = $(this);
var container = $('<div class="radio"></div>');
var mark = $('<span />');
input.wrap(container).after(mark);
});
NOTE
Instead of body, you should use a static-element that is the container of container.
Why you need this
You need delegate event handler, as your element added to DOM dynamically that means. after page load.

after some tested it seems to me that the "wrap" clone the object you pass it as argument, or reference to the object is lost but I'm not so sure.
a first solution is to assign the event "onclick" before moving the object in the "wrap".
$.each($('input[type="radio"]'), function(){
var input = $(this);
var container = $('<div class="radio"></div>');
var mark = $('<span />');
$(container).click(function(){
alert('test'); // triggered now.
});
input.wrap(container).after(mark);
});
a simplified version :
$.each($('input[type="radio"]'), function(){
var wrapper = $('<div class="radio"></div>').click(function(){
alert('test'); // triggered now.
});
$(this).wrap(wrapper).after($('<span />'));
});
dont forget to decalare this function in the onload function
$(function(){
// your code here ....
});

I was also affected by this and found that on is available only with jquery 1.7 and above.
I am on jquery 1.4.1 and on is not available with version. Upgrading jquery was something I wanted to avoid.
Thankfully delegate was there and it solved the problem.

Hooking events with .on() with JQUERY

I want to hook events with the .on() method. The problem is I don't know how to get the object reference of the element on which the event take place. Maybe it's a midunderstanding of how the method really works... but I hope you can help.
Here's what I want to do:
When a file is selected, I want the path to be displayed in a div
<div class="wrapper">
<input type="file" class="finput" />
<div class="fpath">No file!</div>
</div>
Here's my script
$(document).ready(function() {
$this = $(this);
$this.on("change", ".finput", {}, function() {
var path = $(this).val()
$(this).parents().children(".fpath").html(path.split("\\").pop());
});
});
Something like that but that way it doesn't work.

Like this
$(document).ready(function() {
$('.finput').on("change", function() {
var path = $(this).val()
$(this).parents().children(".fpath").html(path.split("\\").pop());
});
});

Do you need to use on()? I'm not sure what you are trying to do exactly.
$("#wrapper").on("change", ".finput", function(event){
var path = $(this).val()
$(this).parents().children(".fpath").html(path.split("\\").pop());
});
I haven't tested your code, but you need to attach the on() to the wrapper.
Can you just use change()?
$('.finput').change(function() {
var path = $(this).val()
$(this).parents().children(".fpath").html(path.split("\\").pop());
});

This should help. If you want to see when a file input changes, bind the event to it
$("input[type='file']").on("change", function(e){
var path = $(this).val();
})

Try:
$(document).ready(function() {
$('body').on('change','input.finput', function() {
var path = $(this).val()
$(this).parent().children(".fpath").html(path.split("\\").pop());
});
});

$(document).on("change", ".finput", function() {
$(".fpath").html(this.value.split("\\").pop());
});
This is a delegated event handler, meaning the .finput element has been inserted dynamically so we need to delegate the listening to a parent element.
If the .finput element is not inserted with Ajax and is present on page load, you should use something like this instead:
$(".finput").on("change", function() {
$(".fpath").html(this.value.split("\\").pop());
});

Event handler triggered twice instead of once

I am sorry that I have asked two questions in a few minutes.
In a html file, I got three child DIV tags in a parent DIV tag:
<div id="container">
<div id="frag-123">123</div>
<div id="frag-124">124</div>
<div id="frag-125">125</div>
</div>
Now when I click either the three child DIV tags, I will see two alert boxes pop up instead of one:
The first alert box will show something like this:
frag-123, and the second alert box will show something like this:
container
I dont know why.
I just want to get the ID value of a child DIV, not the one from the parent DIV.
<script>
$(function() {
$("div").click(function() {
var imgID = this.id;
alert(imgID);
});
});
</script>
Please help.

This is a case of event bubbling. You can stop event bubbling by giving
e.stopPropagation()
inside the click event handler.
Try
$(function() {
$("div").click(function(e) {
var imgID = this.id;
alert(imgID);
e.stopPropagation() // will prevent event bubbling
});
});
If you want to bind click event to only child elemets inside the container div then you can give like this
$("#container div").click(function(){
var imgID = this.id;
alert(imgID);
});

That's because you're binding the event handler to all DIVs. Instead, what you want is bind it only to DIVs within container:
<script type="text/javascript">
$(function() {
$("#container div").click(function() {
var imgID = this.id;
alert(imgID);
});
});
</script>