Develop Reference

Add & remove classes with fewer lines of code

I'm trying to learn how to shorten my jQuery code. Any suggestions or tips would be awesome:
jQuery(document).ready(function($){
$('#checkout_timeline #timeline-4').click(function() {
if ($('#checkout_timeline #timeline-4').hasClass('active')) {
$('#checkout-payment-container').addClass('cpc-visible');
}
});
$('#checkout_timeline #timeline-1, #checkout_timeline #timeline-2, #checkout_timeline #timeline-3').click(function() {
$('#checkout-payment-container').removeClass('cpc-visible');
});
});
To avoid clutter, please find the working version here:
My JSFiddle Code
I know I can use .show() and .hide() but due to other CSS considerations I want to apply .cpc-visible.

There are a handful of things you can improve here. First, you're over-specifying. Ids are unique. No need to select #checkout_timeline #timeline-4 when just #timeline-4 will do. But why even have ids for each li? You can reference them by number using the :nth-child(n) selector. Or better yet, you've already given them application-specific class names like billing, shipment, and payment. Use those! Let's simplify the original content to:
<ul id="checkout_timeline">
<li class='billing'>Billing</li>
<li class='shipping'>Shipping</li>
<li class='confirm'>Confirm</li>
<li class='payment active'>Payment</li>
</ul>
<div id='checkout-payment-container' class='cpc-visible'>
This is the container to show and hide.
</div>
Notice I left the active class, and indeed further initialized the checkout
div with cpc-visible to mirror the payment-is-active condition. Usually I would keep HTML as simple as possible and put "starting positions" initialization in code. But "in for a penny, in for a pound." If we start with payment active, might as well see that decision through, and start the dependent div in a consistent state.
Now, revised JavaScript:
jQuery(document).ready(function($) {
$('#checkout_timeline li').click(function() {
// make clicked pane active, and the others not
$('#checkout_timeline li').removeClass('active');
$(this).addClass('active');
// show payment container only if payment pane active
var paymentActive = $(this).hasClass('payment');
$('#checkout-payment-container').toggleClass('cpc-visible', paymentActive);
});
});
This code is much less item-specific. It doesn't try to add separate click handlers for different tabs/panes. They all get the same handler, which makes a uniform set of decisions. First, that whichever pane is clicked, make it active and the others not active. It does this by removing all active classes, then putting active on just the currently selected pane. Second, it asks "is the current pane the payment pane?" And it uses the toggleClass API to set the cpc-visible class accordingly. Often such "set class based on a boolean condition" logic is simpler and more reliable than trying to pair appropriate addClass and removeClass calls.
And we're done. Here's a JSFiddle that shows this in action.

Try this : You can user jquery selector with timeline and active class to bind click event handler where you can add required class. Same selector but not having active class to remove class.
This will be useful when you add / remove elements and will be more flexible.
jQuery(document).ready(function($){
$('#checkout_timeline .timeline.active').click(function() {
$('#checkout-payment-container').addClass('cpc-visible');
});
$('#checkout_timeline .timeline:not(.active)').click(function() {
$('#checkout-payment-container').removeClass('cpc-visible');
});
});
JSFIddle

Here is one of the ways, you can shorten this code by using :not(). Also its better to use elements than to reference and get them via JQuery always.
jQuery(document).ready(function($) {
var showHideContainer = $('#checkout-payment-container');
$('#checkout_timeline .timeline.active').click(function() {
showHideContainer.addClass('cpc-visible');
});
$('#checkout_timeline .timeline:not(.payment)').click(function() {
showHideContainer.removeClass('cpc-visible');
});
});

try this code its working fine with fiddle
$('.timeline').click(function() {
if ($(this).hasClass('active') && $(this).attr("id") == "timeline-4")
$('#checkout-payment-container').addClass('cpc-visible');
else
$('#checkout-payment-container').removeClass('cpc-visible');
});

This would of been my approach cause you still have to add/remove the active class between each li.
jQuery(document).ready(function($) {
$('ul li').click(function() {
$('ul li.active').removeClass('active');
$(this).closest('li').addClass('active');
k();
});
var k = (function() {
return $('#timeline-4').hasClass('active') ? $('#checkout-payment-container').addClass('cpc-visible') : $('#checkout-payment-container').removeClass('cpc-visible');
});
});
#checkout-payment-container {
float: left;
display: none;
background: red;
color: white;
height: 300px;
width: 305px;
padding: 5px;
}
ul {
list-style: none;
width: 100%;
padding: 0 0 20px 0px;
}
li {
float: left;
padding: 5px 11px;
margin-right: 5px;
background: gray;
color: white;
cursor: pointer;
}
li.active {
background: black;
}
.cpc-visible {
display: block !important;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<ul id="checkout_timeline">
<li id='timeline-1' class='timeline billing'>Billing</li>
<li id='timeline-2' class='timeline shipping'>Shipping</li>
<li id='timeline-3' class='timeline confirm'>Confirm</li>
<li id='timeline-4' class='timeline payment'>Payment</li>
</ul>
<div id='checkout-payment-container'>
This is the container to show and hide.
</div>

Your code look great, i would have written it the same.
bit sure how much it helps but if you like, you can use inline if like this:
$(document).ready(function(){
$('#B').click(function() { (!$('#B').hasClass('active')) ?
$('#A').addClass('active') : ''; });
$('#C').click(function() { $('#A').removeClass('active'); });
});
Link for a live example:
jsFiddle

How can I hover multiple elements in order with using jquery?

I want to hover all div under .wrapper div in order with a delay when the page is loaded. How can I do this with using jquery?
HTML
<div class="wrapper">
<div class="first"></div>
<div class="second"></div>
<div class="third"></div>
</div>
Jquery
$('.wrapper').children().each(function(){
$(this).trigger('hover');
});
https://jsfiddle.net/drxvr1hn/

.trigger('hover') has been deprecated as it caused a great deal of maximum stack exceeded errors.
Deprecated in jQuery 1.8, removed in 1.9: The name "hover" used as a shorthand for the string "mouseenter mouseleave". It attaches a single event handler for those two events, and the handler must examine event.type to determine whether the event is mouseenter or mouseleave. Do not confuse the "hover" pseudo-event-name with the .hover() method, which accepts one or two functions.
Trying to trigger the hover state via jQuery is a very browser/cpu intensive process and a lot of re-rendering of a page to ensure that your call is correct. Therefore the ability was removed but is possible with some JS but will almost certainly cause speed issues and/or stack issues which can cause browser crashes.
A good alternative would be to use classes like below:
$(document).ready(function() {
$('.wrapper div').on('mouseover', function() {
$('.wrapper div').addClass('hover');
}).on('mouseleave', function() {
$('.wrapper div').removeClass('hover');
});
});
.wrapper > div {
width: 100%;
height: 20px;
margin-bottom: 20px;
}
.first {
background-color: #468966;
}
.second {
background-color: #FFF0A5;
}
.third {
background-color: #FFB03B;
}
.first.hover {
background-color: #B64926;
}
.second.hover {
background-color: #8E2800;
}
.third.hover {
background-color: #464A66;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="wrapper">
<div class="first"></div>
<div class="second"></div>
<div class="third"></div>
</div>

you need to set the timeOut interval
$(window).scroll(function() {
$('. wrapper'). children().each(function(index){
var _this = this;
setTimeout( function(){ $(_this).trigger('hover'); }, 200*index);
});
});

Click Propagation failing in Jquery

For part of the site I'm working on, I have a set of sidebars that can pull out. To have them hide when the users are done with them, I've set up a div with a click event (see below) so that whenever the user clicks somewhere outside of the sidebar, the sidebar closes. The problem that I'm running into, however, is that the click event handler is grabbing the event, running its method, and then the click event seems to stop. I've tried using return true and a few other things I've found around here and the internet, but the click event just seems to die.
$('.clickaway').click(function() {
$('body').removeClass(drawerClasses.join(' '));
return true;
});
EDIT: Here is a fiddle with an example: https://jsfiddle.net/2g7zehtn/1/
The goal is to have the drawer out and still be able to click the button to change the color of the text.

The issue is your .clickaway layer is sitting above everything that's interactive, such as your button. So clicking the button, you're actually clicking the layer.
One thing you could do is apply a higher stacking order for elements you want to interact with, above the .clickaway layer. For example, if we apply position: relative, like this:
.show-drawerHotkey .ColorButton {
position: relative;
}
The element will now be in a higher stacking order (since it comes after the clickaway, and we've applied no z-index to clickaway)
Here's a fiddle that demonstrates: https://jsfiddle.net/2g7zehtn/5/

Using this somewhat famous SO answer as a guide, you can bind to the $(document).mouseup(); event and determine whether certain "toggling" conditions apply:
[EDIT] - Example updated to illustrate clicking a link outside of the containing div.
// Resource: https://stackoverflow.com/questions/1403615/use-jquery-to-hide-a-div-when-the-user-clicks-outside-of-it
var m = $('#menu');
var c = $('#menuContainer');
var i = $('#menuIcon');
i.click(function() {
m.toggle("slow");
});
$(document).mouseup(function(e) {
console.log(e.target); // <-- see what the target is...
if (!c.is(e.target) && c.has(e.target).length === 0) {
m.hide("slow");
}
});
#menuIcon {
height: 15px;
width: 15px;
background-color: steelblue;
cursor: pointer;
}
#menuContainer {
height: 600px;
width: 250px;
}
#menu {
display: none;
height: 600px;
width: 250px;
border: dashed 2px teal;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
I'm a link outside of the container
<div id="menuContainer">
<div id="menuIcon"></div>
<div id="menu"></div>
</div>

Make HTML element inherit events from custom object

In the webpage I'm working I have a lot of small images to wich I want to assign the same set of events. Instead of adding them one by one, I thought it would be more elegant if I could make that type of element inherit these events.
What comes to my mind is something like :
function InheritEvents(){};
InheritEvents.prototype.onmouseover = function(){...action a..};
InheritEvents.prototype.onmouseout = function(){...action b..};
var temp = originalHTMLElement.constructor; //(in this case img)
originalHTMLElement.prototype = new InheritEvents();
originalHTMLElement.constructor = temp;
a) Am I not disturbing the originalHTMLElement ?
b) Is it possible to name the custom object property, for example
".onmouseover" like in the classic way:
originalHTMLElement.onmouseover = function()... ?
c) More conceptual: Is it possible to mix your custom objects with HTML
elemenst / DOM nodes ?

I would strongly recommend against this. It probably wouldn't work anyway, but messing with the prototypes of host objects is, in general, a bad idea.
I don't think there should really be a problem with iterating through the target elements and attaching events to them, but if you don't like that, you can use event delegation:
window.onload = function() {
document.getElementById("images").onclick = function(e) {
if (e.target && e.target.classList.contains("clickable")) {
e.stopPropagation();
console.log("I've been clicked!");
}
}
}
#images div {
width: 40px;
height: 40px;
float: left;
margin: 5px;
background-color: blue;
}
#images div.clickable {
background-color: red;
}
#images + * {
clear: both;
}
<div>
<div id="images">
<!-- Pretend that these DIVs are your images -->
<div></div>
<div class="clickable"></div>
<div></div>
<div></div>
<div class="clickable"></div>
</div>
<div>
Click one of the red images above
</div>
</div>
Of course, if you're using jQuery, the .on() method can handle both the "add an event handler to all members of a set" option and the event delegation option in a single line.

How to move an element into another element

I would like to move one DIV element inside another. For example, I want to move this (including all children):
<div id="source">
...
</div>
into this:
<div id="destination">
...
</div>
so that I have this:
<div id="destination">
<div id="source">
...
</div>
</div>

You may want to use the appendTo function (which adds to the end of the element):
$("#source").appendTo("#destination");
Alternatively you could use the prependTo function (which adds to the beginning of the element):
$("#source").prependTo("#destination");
Example:
$("#appendTo").click(function() {
$("#moveMeIntoMain").appendTo($("#main"));
});
$("#prependTo").click(function() {
$("#moveMeIntoMain").prependTo($("#main"));
});
#main {
border: 2px solid blue;
min-height: 100px;
}
.moveMeIntoMain {
border: 1px solid red;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="main">main</div>
<div id="moveMeIntoMain" class="moveMeIntoMain">move me to main</div>
<button id="appendTo">appendTo main</button>
<button id="prependTo">prependTo main</button>

My solution:
Move:
jQuery("#NodesToMove").detach().appendTo('#DestinationContainerNode')
copy:
jQuery("#NodesToMove").appendTo('#DestinationContainerNode')
Note the usage of .detach(). When copying, be careful that you are not duplicating IDs.

Use a vanilla JavaScript solution:
// Declare a fragment:
var fragment = document.createDocumentFragment();
// Append desired element to the fragment:
fragment.appendChild(document.getElementById('source'));
// Append fragment to desired element:
document.getElementById('destination').appendChild(fragment);
Check it out.

Try plain JavaScript: destination.appendChild(source);.
onclick = function(){ destination.appendChild(source) };
div {
margin: .1em;
}
#destination {
border: solid 1px red;
}
#source {
border: solid 1px gray;
}
<div id=destination>
###
</div>
<div id=source>
***
</div>

I just used:
$('#source').prependTo('#destination');
Which I grabbed from here.

If the div where you want to put your element has content inside, and you want the element to show after the main content:
$("#destination").append($("#source"));
If the div where you want to put your element has content inside, and you want to show the element before the main content:
$("#destination").prepend($("#source"));
If the div where you want to put your element is empty, or you want to replace it entirely:
$("#element").html('<div id="source">...</div>');
If you want to duplicate an element before any of the above:
$("#destination").append($("#source").clone());
// etc.

You can use:
To insert after,
jQuery("#source").insertAfter("#destination");
To insert inside another element,
jQuery("#source").appendTo("#destination");

You can use the following code to move the source to the destination:
jQuery("#source")
.detach()
.appendTo('#destination');
Try the working CodePen.
function move() {
jQuery("#source")
.detach()
.appendTo('#destination');
}
#source{
background-color: red;
color: #ffffff;
display: inline-block;
padding: 35px;
}
#destination{
background-color:blue;
color: #ffffff;
display: inline-block;
padding: 50px;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="source">
I am source
</div>
<div id="destination">
I am destination
</div>
<button onclick="move();">Move</button>

If you want a quick demo and more details about how you move elements, try this link:
http://html-tuts.com/move-div-in-another-div-with-jquery
Here is a short example:
To move ABOVE an element:
$('.whatToMove').insertBefore('.whereToMove');
To move AFTER an element:
$('.whatToMove').insertAfter('.whereToMove');
To move inside an element, ABOVE ALL elements inside that container:
$('.whatToMove').prependTo('.whereToMove');
To move inside an element, AFTER ALL elements inside that container:
$('.whatToMove').appendTo('.whereToMove');

I need to move content from one container to another including all the event listeners. jQuery doesn't have a way to do it, but the standard DOM function appendChild does.
// Assuming only one .source and one .target
$('.source').on('click',function(){console.log('I am clicked');});
$('.target')[0].appendChild($('.source')[0]);
Using appendChild removes the .source* and places it into target including its event listeners: Node.appendChild() (MDN)

You may also try:
$("#destination").html($("#source"))
But this will completely overwrite anything you have in #destination.

You can use pure JavaScript, using appendChild() method...
The appendChild() method appends a node as the last child of a node.
Tip: If you want to create a new paragraph, with text, remember to
create the text as a Text node which you append to the paragraph, then
append the paragraph to the document.
You can also use this method to move an element from one element to
another.
Tip: Use the insertBefore() method to insert a new child node before a
specified, existing, child node.
So you can do that to do the job, this is what I created for you, using appendChild(), run and see how it works for your case:
function appendIt() {
var source = document.getElementById("source");
document.getElementById("destination").appendChild(source);
}
#source {
color: white;
background: green;
padding: 4px 8px;
}
#destination {
color: white;
background: red;
padding: 4px 8px;
}
button {
margin-top: 20px;
}
<div id="source">
<p>Source</p>
</div>
<div id="destination">
<p>Destination</p>
</div>
<button onclick="appendIt()">Move Element</button>

I noticed huge memory leak & performance difference between insertAfter & after or insertBefore & before .. If you have tons of DOM elements, or you need to use after() or before() inside a MouseMove event, the browser memory will probably increase and next operations will run really slow.
The solution I've just experienced is to use inserBefore instead before() and insertAfter instead after().

Dirty size improvement of Bekim Bacaj's answer:
div { border: 1px solid ; margin: 5px }
<div id="source" onclick="destination.appendChild(this)">click me</div>
<div id="destination" >...</div>

For the sake of completeness, there is another approach wrap() or wrapAll() mentioned in this article. So the OP's question could possibly be solved by this (that is, assuming the <div id="destination" /> does not yet exist, the following approach will create such a wrapper from scratch - the OP was not clear about whether the wrapper already exists or not):
$("#source").wrap('<div id="destination" />')
// or
$(".source").wrapAll('<div id="destination" />')
It sounds promising. However, when I was trying to do $("[id^=row]").wrapAll("<fieldset></fieldset>") on multiple nested structure like this:
<div id="row1">
<label>Name</label>
<input ...>
</div>
It correctly wraps those <div>...</div> and <input>...</input> BUT SOMEHOW LEAVES OUT the <label>...</label>. So I ended up use the explicit $("row1").append("#a_predefined_fieldset") instead. So, YMMV.

The .appendChild does precisely that - basically a cut& paste.
It moves the selected element and all of its child nodes.