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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

two division put the details in inner div using jquery

i have 2 divisoin
<div id="details">
<div id="feature">
</div>
</div>
I need to put the content using $("#details").html(content); (it is working correctly) like that way i need to put the content inside feature div i am using following way:
$("#details #feature").html(content);
but it is not working..how to solve?

When you use $("#details").html(content); you override the content of the div. So you're inner div with the id feature gets removed. Maybe you use $("#details").prepend(content); or you add another div for the main content and replace that content.
Look here is an example:
https://jsfiddle.net/morrisjdev/s9u7rfcu/

ID is a unique attribute so you can directly use id like below.
$(function() {
var content = "Some text here";
$('#feature').html(content);
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="details">
<div id="feature">
</div>
</div>
OR
$(function() {
var content = "Some text here";
$('#details').find('#feature').html(content);
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="details">
<div id="feature">
</div>
</div>

$(document).ready(function(){
var htmldetail ="Hello! I am Here";
var details = $("#details").html(htmldetail);
$("#userfeature").html(details);
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>
<div id="details">
<div id="userfeature">
</div>
</div>

The second is #feature and not #userfeature. And also add the jQuery Library as well. You can replace test with content variable.
$("#feature").html("test");
<div id="details">
<div id="feature">
</div>
</div>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
And also remember Id is unique and hence no need to mention its parent.
Run the following snippet and you can get the output.

Simple way..Go Through this
HTML
<div id="details">
<div id="feature">
</div>
</div>
JQUERY
$(document).ready(function()
{
var content="contain sample data";
// $("#details").html(content); if you wrote like this,
this will replace all content, so the inner div will be replaced
$("#details").append(content); // outer div
$("#feature").html(content);
});

Or you can use css-like selector method:
$(document).ready(function() {
$('#details > #feature').html('Hello <strong>World!!!</strong>');
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="details">
<div id="feature">
</div>
</div>

I have created a plunk for it and it is working.
Try including the action inside
$( document ).ready(function() {
console.log( "ready!" );
var content = 'Hey there';
$("#details #feature").html(content);
});
Plunk :- http://plnkr.co/edit/63GsIoGmprnKs7oe77cF?p=preview

Scrolling the height of several divs by several buttons

I have a page with the following structure:
<div id="about" class="section">
<div class="button">
<img src="/images/arrow.png">
</div>
</div>
<div id="films" class="section">
<div class="button">
<img src="/images/arrow.png">
</div>
</div>
<div id="projects" class="section">
<div class="button">
<img src="/images/arrow.png">
</div>
</div>
I would like that when clicking on the image, you will be scrolled to the end of the <div> where the <img>is located.
I have stated with this code but it works only for the first image.
function go_to(){
$("body,html").animate({scrollTop: $('.section').height()}, 900, "easeInOutExpo");
}
$(document).ready(function(){
var go_to_div = $('.button img');
$(go_to_div).click(function(event) {
go_to()
});
});
If necessary, I can change the HTML structure. Thank you!!

Because for scrollTop property, you need to give a value to go there. Your $('.section').height() code allways gives the same value so it kinda stuck. Try this instead
function go_to(section){
var pos = section.position();
$("body,html").animate({scrollTop: section.height() + pos.top}, 900, "easeInOutExpo");
}
$(document).ready(function(){
$('.button img').click(function(event) {
go_to($(this).closest(".section"));
});
});
FIDDLE

How to target multiple instances of same <div> .class individually one at a time?

I currently have x repeative setup of the same class:
<div class="span3">..content1</div>
<div class="span3">..content2</div>
<div class="span3">..content3</div>
How do I target each .span3 class individually without adding some unique id for each of them? Is that even possible?
What I want to do is apply some animation on each .span3 at a time with a little delay inbetween each - like fading one .span3 class up at a time or do some other animation like scale from 0 to 1.
Was trying to figure out if I could somehow add them to an array? And from there on id be able to iterate through the array doing whatever i wanted.
The .span class in more HTML context:
<div class="row-fluid">
<div class="span3">
<span>Headline</span>
<img src="images/thumb_1.gif" class="img-polaroid">
</div>
<div class="span3 frameColor_yellow">
<span>Headline</span>
<img src="images/thumb_2.gif" class="img-polaroid">
</div>
</div>
<div class="row-fluid">
<div class="span3">
<span>Headline</span>
<img src="images/thumb_3.gif" class="img-polaroid">
</div>
<div class="span3 frameColor_yellow">
<span>Headline</span>
<img src="images/thumb_4.gif" class="img-polaroid">
</div>
</div>
//etc...
Any suggestions?

Like this -
$('.span3').each(function(index,element){
var sp = $(this);
// do your stuff with this span
});

Try this:
$(".row-fluid > .span3").each(function (index) {
$(this).delay(index * 500).animate({
opacity: 0
}, 500);
});
FIDDLE
Updated the answer based on #Rodrigo suggestion!

Proberbly you would like to wrap all your span3s inside a container, lets say
<div class="my-loop-divs">
<div class="span3"></div>
<div class="span3"></div>
</div>
I assume that you are using zepto or jQuery
$(document).ready(function () {
$('.my-loop-divs .span3').each(function (index, element) {
// do the animation on $(this)
});
});

Count divs and add jquery to expand and collapse Text

I hope someone can help. There are 3 divs with employee-block class in the html code included. I would like to add javascript/jquery code to expand/collapse anything after the 2nd div (or employee-block div). This is my html:
<div class="employee-block">
<img alt="test" title="test" src="/images/42.png" /><div class="employee-details"><span class="red strong">TEST</span><br /><p>test description</p></div>
</div>
<div class="bottom"></div>
<div class="employee-block">
<div class="employee-details"><span class="red strong">support#.net</span><br /><p>testing description</p></div>
</div>
<div class="bottom"></div>
<div class="employee-block">
<img alt="test" title="test" src="/images/42.png" /><div class="employee-details"><span class="red strong">TEST</span><br /><p>test description</p></div>
</div>
<div class="bottom"></div>
I have this jquery code, but not sure how to plug it in. In my example html code I only want to hide/show the 3rd employee-block div, so really anything more than 2 because there could be more than 2:
<script type="text/javascript">
$(document).ready(function () {
$('div.view').hide();
$('div.slide').click(function () {
$('div.view').slideToggle(400);
return false;
});
});

Your question is not very clear for me, but look at this code:
$('a.createSomeButton').click( function() {
if ( ! $('#IwillCollapse').length ) {
$('.employee-block:gt(1)').wrap('<div id="IwillCollapse" />');
}
$('#IwillCollapse').slideToggle();
return false;
});

This should help you get on your way. There's many different ways to achieve what you want but this might be the easiest to grasp. http://jsfiddle.net/jSZxp/1/
var employeeBlocks = $('.employee-block').slice(2); //returns all after the first 2
employeeBlocks.addClass('hidden'); //attach the hidden class
$('button').on('click', function(){
employeeBlocks.toggle('hidden'); //toggles the hidden class
});