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Add div before the div using jQuery

I have this HTML:
<p></p>
<div class="comment_like">
<span class="reaction_2 tooltipstered" id="like13seperator2" rel="unlike"><i
class="likeIconDefault"></i>Like</span>
</div>
Now I want to add this div: <div class="commentLikeCount"></div> before this comment_like class using jQuery.
I am trying with this code:
$("#like"+posts_id).parents(".comment_like").prepend('<div class="commentLikeCount"></div>');
but somehow not working :(
Updated for the new Questions:
Now I have that HTML:
<p></p>
<div class="commentLikeCount">
<br>
<span class="float-right"> 1</span>
<img src="assets/images/db_haha.png" alt="" class="float-right old">
<img src="assets/images/db_love.png" alt="" class="float-right">
</div>
<div class="comment_like">
<span class="unLike_2" id="like13seperator2" rel="unlike">
<i class="loveIconSmall likeTypeSmall"></i>Love
</span>
</div>
Now, I just want to remove the last Img from the coomentLikeCount class.

You can use insertBefore:
$('<div class="commentLikeCount" />')
.insertBefore($("#like"+posts_id).parents(".comment_like"))
Or before:
$("#like"+posts_id).parents(".comment_like")
.before('<div class="commentLikeCount" />')
If you're inserting commentLikeCount in every .comment_like, then just use $('.comment_like') instead of $("#like"+posts_id).parents(".comment_like")
Regarding your comment:
well if I already have this div then how can select this div?
You can prepend using insertBefore like:
$('.commentLikeComment').insertBefore($("#like"+posts_id).parents(".comment_like"));
To your updated question, you can remove last image like:
$('.commentLikeCount img').last().remove()

You can do with before().
$(".comment_like").before("<div class='commentLikeCount'></div>");

Enclose whole div in an <a>

I have a div which I want to surround with an <a href>. I have the jQuery to add the <a href> after the div but I struggle to set it before and close it after the div.
This is the jQuery code I have:
$('.box_service').each(function() {
var link = $(this).html();
$(this).contents().wrap('');
});
It results in this HTML:
<div class="row">
<div class="box_service">
<a href="example.com">
<div class="inner-row"></div>
</a>
</div>
</div>
However my goal is this structure:
<div class="row">
<a href="example.com">
<div class="box_service">
<div class="inner-row"></div>
</div>
</a>
</div>
I can't enter the div before because there are more boxes in this row so I would add the <a href> to everything in there

The issue is due to your call to contents() which means you're wrapping the elements inside .box_service, not that element itself. Remove that method call.
Also note that each() is redundant, you can do what you require in a single line:
$('.box_service').wrap('');
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="row">
<div class="box_service">
Box service #1
<div class="inner-row">Inner row #1</div>
</div>
</div>
<div class="row">
<div class="box_service">
Box service #2
<div class="inner-row">Inner row #2</div>
</div>
</div>

.content will wrap the contents of your div, you want to wrap the div with <a> so call wrap on the div not on contents.
$('.box_service').each(function() {
var link = $(this).html();
$(this).wrap('');
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="row">
<div class="box_service">
<div class="inner-row"></div>
</div>
</div>

$('.box_service').each(function() {
var link = $(this).html();
$(this).wrap('');
});
You just need to remove contents() in between $(this).wrap() because contents() mean that you are wrapping the children of $(this).

Remove .contents() in order to wrap around each element with the class box-service:
$('.box_service').each(function() {
$(this).wrap('');
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="row">
<div class="box_service">
<a href="example.com">
<div class="inner-row"></div>
</a>
</div>
</div>

$('.box_service').wrap('');

Add number to end of div with jQuery

I'm using jQuery to create a simple addClass on hover. Hovering over a #science-panel-number div triggers a class of .active to be added to an #iphone-screen-number div.
Here is my jQuery:
$('#science-panel-1').hover(function(){
$('#iphone-screen-1').addClass('active');
},function(){
$('#iphone-screen-1').removeClass('active');
});
$('#science-panel-2').hover(function(){
$('#iphone-screen-2').addClass('active');
},function(){
$('#iphone-screen-2').removeClass('active');
});
$('#science-panel-3').hover(function(){
$('#iphone-screen-3').addClass('active');
},function(){
$('#iphone-screen-3').removeClass('active');
});
My HTML:
<div class="col-md-4">
<div id="science-panel-1" class="science-panel__item">
Content goes in here!
</div>
<div id="science-panel-2" class="science-panel__item">
Content goes in here!
</div>
<div id="science-panel-3" class="science-panel__item">
Content goes in here!
</div>
</div>
<div class="col-md-4">
div id="iphone-screen-1" class="iphone-screen-item">
<img src="IMG-url-here.jpg" alt="" />
</div>
div id="iphone-screen-2" class="iphone-screen-item">
<img src="IMG-url-here.jpg" alt="" />
</div>
<div id="iphone-screen-3" class="iphone-screen-item">
<img src="IMG-url-here.jpg" alt="" />
</div>
<div id="iphone-screen-4" class="iphone-screen-item">
<img src="IMG-url-here.jpg" alt="" />
</div>
<div id="iphone-screen-5" class="iphone-screen-item">
<img src="IMG-url-here.jpg" alt="" />
</div>
<div id="iphone-screen-6" class="iphone-screen-item">
<img src="IMG-url-here.jpg" alt="" />
</div>
</div>
<div class="col-md-4">
<div id="science-panel-4" class="science-panel__item">
Content goes in here!
</div>
<div id="science-panel-5" class="science-panel__item">
Content goes in here!
</div>
<div id="science-panel-6" class="science-panel__item">
Content goes in here!
</div>
</div>
This feels like a lot of code to do the same script. Is there a way to have one piece of script that can add the numbers it self? As #science-panel-1 will always link to to #iphone-screen-1 and so on.

This will do what you need. Just apply the handlers to elements whose ID begins with science-panel-, which should cover all of them...
$("[id^=science-panel-]").hover(function() {
// get the corresponding iphone-screen element id
var iphoneScreen = "#" + this.id.replace("science-panel-", "iphone-screen-");
$(iphoneScreen).addClass("active");
},function() {
var iphoneScreen = "#" + this.id.replace("science-panel-", "iphone-screen-");
$(iphoneScreen).removeClass("active");
});

I recommend changing the markup to include the data you need to drive the script:
<div data-target="#iphone-screen-1" id="science-panel-1" class="science-panel__item">...</div>
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
This allows you to select all the science panel items at once:
$('.science-panel__item')
and perform the exact same script on each of them:
$('.science-panel__item').hover(function () {
$($(this).data('target')).addClass('active');
// ^^^^^^^^^^^^^^^^^^^^^^
// use the data-target attribute as a selector
}, function () {
$($(this).data('target')).removeClass('active');
});
If you change the attribute and the selector, you'll have a reusable feature you can apply to any element:
$('[data-hover-target]').hover(function () {
$($(this).data('hoverTarget')).addClass('active');
}, function () {
$($(this).data('hoverTarget')).removeClass('active');
});

I'd firstly ask if the active class is strictly necessary? Can what you want be achieved with CSS if it is for styling only by using the :hover pseudoclass?
If you do need the .active class for some reason, I would change the markup to be a little more generic so that all the science panels had a CSS class of .science-panel and all the iphone screens had a class of .iphone-screen. Then you could simplify the JS to look like
$('.science-panel').on('mouseenter mouseleave', function(e) {
$(this).find('.iphone-screen').toggleClass('active', e.type === 'mouseenter');
});
This will find the .iphone-screen inside of the .science-panel that you hover over and toggle the class to on if the mouse enters and off when the mouse leaves it.
edit: I see you've updated your answer to include your markup, this answer was assuming that your iphone-screens were nested in the science-panels so this won't necessarily work for you if you don't/can't nest your markup

JavaScript animate function doesn't work

This is what the code looks like.
<head>
<link type="text/css" rel="stylesheet" href="C:\Users\User\Desktop\css1.css" />
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<script src="C:\Users\User\Desktop\js.js"></script>
</head>
<body>
<div id="header_wrap">
<div id="header">
<div id="logo">
LOGO
</div>
<div class="nav">
<a href="http://www.google.se">
Stuff
</a>
<a href="javascript:void(0)">
Other stuff
</a>
<a href="javascript:void(0)">
More stuff
</a>
</div>
<div class="mobile_nav"></div>
<div class="mobile_nav_menu">
<div class="mobile_menu">
<span>Stuff</span>
<span>Other stuff</span>
<span>More stuff</span>
</div>
<div class="mobile_close">
</div>
</div>
</div>
</div>
<div class="image_container">
<div class="inner_content" id="slide1">
<h2>
CONTENTS
</h2>
</div>
<a class="button" href="javascript:void(0)"></a>
</div>
</body>
the .js file contains this code
setTimeout(function(){
$("#slide1").css('opacity', '1');
},800);
setInterval(function(){
$(".button").toggleClass("opacity");
},1000);
//Navigation
$(".mobile_nav").click(function() {
$(".mobile_nav_menu").animate({right: 0});
})
$(".mobile_close").click(function() {
$(".mobile_nav_menu").animate({right: -270});
})
Can anyone help me out with what I'm doing wrong and how it can be fixed?
Thank you! /AJ
UPDATE: The .js loads (tried the alert function), but does not fill the function it should. Original pen can be found on http://codepen.io/yuriylianguzov/pen/qjwEe

One of the problems is that you are trying to reference a javascript file from a physical file path, and not a url (or relative path). You can't use your harddrive path in an html file to include javascript.
<script src="C:\Users\User\Desktop\js.js"></script>
If your javascript is in the same folder as your html, try something like this:
<script src="js.js"></script>
I'm not exactly sure what the expected behavior for the JavaScript is, because it appears to be doing what it is intended to do. If you look at the DOM in the codepen link that you provided the element with the id of 'slide1' has its opacity style set to 1 (see below) and the anchor tag with class of 'button' is getting the class 'opacity' toggled on and off every second (not depicted below, but you can see it happening in firebug).
<div class="image_container">
<div id="slide1" class="inner_content" style="opacity: 1;">
<h2>
We are who we choose to be.
</h2>
</div>
</div>
The other two click handler's are targeting empty elements (the element with class of 'mobile_nav', and the element with class of 'mobile_close') so they aren't going to do anything.
$(".mobile_nav").click(function() {
$(".mobile_nav_menu").animate({right: 0});
})
$(".mobile_close").click(function() {
$(".mobile_nav_menu").animate({right: -270});
})
<div class="mobile_nav"></div>
<div class="mobile_nav_menu">
<div class="mobile_menu">
<span>Projects</span>
<span>Profile</span>
<span>Contact</span>
</div>
<div class="mobile_close"></div>
</div>
I hope this helps!

1) Some of the elements your javascript is acting on don't have any content
2) Change the line $(".mobile_nav_menu").animate({right: 0}); to: $(".mobile_nav_menu").animate({"right": "0"}); and do the same with the other one, though it won't have any functionality, really.
3) your class mobile_nav_menu needs to have css that says position:relative for the attribute "right" to work.
4) I'd recommend moving your mobile_close div outside the mobile_nav_menu div so it doesn't move when you click it
If anyone has stuff to add, please do so.

Programmatically apply the image alt attribue as a class to parent element

I want to add as a class the image alt attribute to its container element. Markup:
<div class="field-group-our-people">
<div class="field-items even>
<img alt="John">
</div>
<div class="field-items odd>
<img alt="Kevin">
</div>
<div class="field-items even>
<img alt="Kate">
</div>
<div class="field-items odd>
<img alt="Martin">
</div>
</div>
To be like this:
<div class="field-group-our-people">
<div class="field-items even john>
<img alt="John">
</div>
<div class="field-items odd kevin>
<img alt="Kevin">
</div>
<div class="field-items even kate>
<img alt="Kate">
</div>
<div class="field-items odd martin>
<img alt="Martin">
</div>
</div>
My Jquery code(but not working):
//Add the image alt attribute as class for individual styling
$('.group_our_people .field-item').each(function() {
var att = $('.group_our_people .field-item img').attr('alt');
$(this).addClass(att);
});
What is wrong/missing in my code?

You should get the img that is child of the current div (on iteration):
var att = $(this).find('img').attr('alt');
The way you're doing (i.e. repeating the selector), you end up retrieving multiple values, and only the first one is taken into account. So, every div will get its class: "John".

$('.field-group-our-people .field-items img').each(function() {
$(this).parent().addClass( $(this).attr('alt') );
});

$('div.field-group_our_people div[class^=".field-items"] img').each(function()
{
var att = $(this).attr('alt');
$(this).parent().addClass(att);
});