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How to raise an event click, have fields added to Ajax?

I have code that works correctly
$(document).on('click',"a.img,a.imgs",function() {
$(this).next().find('a:first').click();
return false;
});
But when I add new fields ajax ( for example show more), then with them this code does not work, and it's sad

Edited my answer as I misread your code and got everything mixed up.
Here's an explanation from another SO thread that might help you fix the problem:
It's probably not working due to one of:
Not using recent version of jQuery
Not wrapping your code inside of DOM ready
or you are doing something which causes the event not to bubble up to the listener on the document.
$(document).ready(function() {
// This WILL work because we are listening on the 'document',
// for a click on an element with an ID of #test-element
$(document).on("click","#test-element",function() {
alert("click bound to document listening for #test-element");
});
// This will NOT work because there is no '#test-element' ... yet
$("#test-element").on("click",function() {
alert("click bound directly to #test-element");
});
// Create the dynamic element '#test-element'
$('body').append('<div id="test-element">Click mee</div>');
});
$(document).on("click"... not working?

The second div won't come back after it's clicked twice

I'm not really good at JQUERY, and I just tend to observe things, but here is a code I've been working on. So the goal here is that I want both .people and .people_bg to close when I click anywhere on my screen.
<script>
$(document).ready(function(){
$("#relations").click(function(){
$(".people").slideToggle("fast");
$(".people_bg").slideToggle("fast");
});
});
$('a.close, .people_bg').live('click', function() {
$('.people_bg , .people').fadeOut(function() {
$('.people_bg, a.close').remove(); //fade them both out
});
return false;
});
});
</script>
The problem is: It only works once. The second time around, only '.people' appears, and not '.people_bg'

The remove function that you're using actually deletes elements from the page altogether, so that's your culprit. Replace that with a more appropriate function and you should be just fine.

You can simply just fadeOut without remove. This will hide them without actually removing them from the page: JS FIDDLE
$('a.close, .people_bg').on('click', function () {
$('.people_bg , .people').fadeOut();
});
Additionally, in your first function, you can combine the two class selectors:
$("#relations").click(function () {
$(".people, .people_bg").slideToggle("fast");
});
Also note that you should be using jquery's .on() as of version 1.7 instead of .live().

why does my button disappear when I add the toggle event in jquery?

I want to toggle text between bold and normal I made this code for it, but when I open my page the bold button disappears?
$("#bold").toggle(function() {
$('.focus').css("font-weight", $(this).val());
}, function() {
$('.focus').css("font-weight", "normal");
});
Is there something wrong with my code?
Please help, thanks in advance.

Assuming you're using jQuery 1.9 or later the problem is that the .toggle() event handling method was removed from the library. So what you're actually calling is the .toggle() function that hides/shows elements. (In earlier versions of jQuery both functions existed and jQuery figured out which one you meant based on the arguments passed in.)
You can implement your own toggle easily enough with a standard .click() handler:
$("#bold").click(function() {
var f = !$(this).data("toggleFlag");
if (f) {
$('.focus').css("font-weight", $(this).val());
} else {
$('.focus').css("font-weight", "normal");
}
$(this).data("toggleFlag", f);
});
This uses the .data() method to keep track of a boolean flag to indicate which code to execute. The very first time the click handler is called the flag will be returned as undefined because it hasn't previously been set, but we just convert that to a boolean with ! (assuming you want to execute the if and not the else case on the first click).

It disappears because that version of toggle is deprecated and removed, and in newer versions of jQuery all it does is toggle visibility.
You could do something like this instead :
var state = true;
$("#bold").on('click', function() {
$('.focus').css("font-weight", state ? this.value : 'normal');
state = !state;
});
FIDDLE

The only solution I fount to the disappearing element after click... is Callback function after the toggle effect finished.
here a link that explain the Callback function.
and here is my code:
jQuery('.menu li.item-487').click(function(){
jQuery('#main-menu .moduletable .menu li').toggle("slow",function(){jQuery('.menu li.item-487').css('display' , 'block');});
});

PopUp is not opening on mousehover

I am not sure what i am doing wrong here.i have a div and i want to open up a popup if user hover over that div section and want to close on mouseout. here is my code
<div class="topCart">
some data
</div>
this is my JQuery code
$(".topCart").mouseover(function() {
$.get('${rolloverPopupUrl}?bustcache=' + new Date().getTime(),
function(result) {
$('#viewCart').html(result);
refreshMiniCart();
});
$('#viewCart').slideDown('slow');
}).mouseout(function() {
$('#viewCart').slideUp('fast');
});
above code is not working nor its giving any Ajax call to fetch fresh data, while if i use following code
$(document).ready(function(){
$(".topCart").hover( function () {
$('#viewCart').html("");
$.get('${rolloverPopupUrl}?bustcache='+new Date().getTime(), function(result){
$('#viewCart').html(result);
refreshMiniCart();
});
if($('#viewCart').is(':hidden')){
$('#viewCart').slideDown('slow'); }
},
function () {
$('#viewCart').slideUp('fast');
});
});
this piece of code is working and its fetching data so i do not see use of document.ready
with my limited knowledge of Jquery i tried but not able to see the reason of not working of code
can any one point me my error?

Try having some basic structure and cleanliness (which is next to godliness) when typing your code, and spotting errors will be much easier:
$(function() {
$(".topCart").on({
mouseenter: function() {
var elem = $('#viewCart');
elem.empty();
$.get('${rolloverPopupUrl}?bustcache=' + new Date().getTime(), function(result) {
elem.html(result);
refreshMiniCart();
});
if (!elem.is(':visible')) elem.slideDown('slow');
},
mouseleave: function() {
$('#viewCart').slideUp('fast');
}
});
});​

The first code does not work becuse not all DOM elements are downloaded when you set events. And it cause that result of $(".topCart") is empty. This not fire any erros, syntax is correct, problem is jQuery works with html, that are not completed.
$(document).ready(...)
or
$(function() {
// Handler for .ready() called.
});

$(document).ready(function() {
$(".topCart").mouseover(function() {
...
}
});
You need to use the document.ready before events can fire, after the document all DOM elements have loaded which you can be sure of, otherwise you're looking for an event which hasnt laoded into the DOM

Without the $(document).ready(), the first has not actually been bound to $('.topCart').
The second example, using the document ready gives a moment or time at which to bind the function to the hover event.

After jQuery ajax load or update, I lose the mouseover event

After using .load to update my div, that is add item to my list, I used firebug and saw that the list was updated. However, I lost the mouseover event that worked when the page first loaded. In my script js I have:
// hide and show are css classes that display none and block respectively
function openList(){
$("#miniList").removeClass().addClass("show");
}
function closeList(){
$("#miniList").removeClass().addClass("hide");
}
...
$(document).ready(function() {
$("#miniList").mouseover(function() {
openList();
})
$("#miniList").mouseout(function() {
closeList();
})
});
function addItemToDiv(id, ref, num) {
$("#miniList").load("/list/ajax_updateList.jsp", {
'action' : 'additem',
'pid' : id,
'pref' : ref,
'qty' : num
});
}
Of course, this works fine the first time the page is loaded, but when I add item to the list, DOM is update but mouseover effects don't work any more.
Any thoughts are more than welcomed.

For DOM elments added dynimically you need to use the jquery .live() function.
Please go through the below link, I think that might fix your problem:
api.jquery.com/live
#ishwebdev, this is common problem we run , for all the DOM elments added after pageload like run time, we need to bind the events through live instead of regular bind
If you are using jquery 1.4 use below code:
// from jquery.com
$('give your selector here').live('mouseover mouseout', function(event) {
if (event.type == 'mouseover') {
// do something on mouseover
} else {
// do something on mouseout
}
});

#siri: thanks for the excellent answer, it worked for me right away. Here's my shopping cart dropdown example:
Before:
$("#cart-items").mouseenter(function(){
$('#cart-pulldown').show();
});
After:
$("#cart-items").live('mouseenter', function(){
$('#cart-pulldown').show();
});
With .live the event handling still works even after I change the underlying HTML via an Ajax call.

The selected answer no longer works for jquery 1.9+.
Instead, use "on" event, like
$( document ).on("keyup", "input.assets",function(event) {...
http://api.jquery.com/on/