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JavaScript style.height of sister div on mouseover

I'm trying to simulate the look of an audio visualizer so that on mouseover, "this" div becomes the tallest div, while the sister divs shift heights as well. How do I specify which height the sister divs should change to?
Code
window.onload = window.onscroll = function() {
var bars = document.getElementsByClassName('bar');
[].forEach.call(bars, function(bar) {
bar.style.height = Math.random() * 50 + '%';
});
}
.bars {
position: fixed;
top: 30px;
right: 0;
bottom: 40px;
left: 0;
margin: 10px auto;
text-align: center
}
.bars::before {
content: "";
display: inline-block;
height: 100%;
}
.bar {
display: inline-block;
vertical-align: bottom;
width: 4rem;
height: 25%;
margin-right: .75em;
background: #333;
-webkit-transition: height 0.5s ease-out;
transition: height 0.5s ease-out;
}
<div class="container">
<div class="bars">
<div class="bar" id="barOne"></div>
<div class="bar" id="barTwo"></div>
<div class="bar" id="barThree"></div>
<div class="bar" id="barFour"></div>
<div class="bar" id="barFive"></div>
</div>
</div>
Thanks for your help!

Here's a fiddle that should get you pointed in the right direction: https://jsfiddle.net/8p2yvro9/7/
let container = document.getElementsByClassName('container')[0];
let bars = document.getElementsByClassName('bar');
[].forEach.call(bars, bar => {
bar.addEventListener('mouseover', function() {
shiftBars(bar);
});
});
function shiftBars(barOver) {
[].forEach.call(bars, function(bar) {
bar.style.height = Math.random() * 50 + '%';
});
barOver.style.height = '100%';
}

progress bar is not working

i am trying to made progress bar but its can working plz solve it .
i am using if else for increasing the width but it's not working
var x = document.getElementById("p_bar");
for(var i = 0; i < 100; i++) {
var wid;
wid=1;
if(wid == 800)
break;
else
wid+=8;
x.style.width=wid+"px";
}
document.body.style.background = "#"+((1<<24)*Math.random()|0).toString(16);
#cont {
width: 800px;
height: 30px;
background-color: cornsilk;
position: relative;
}
#p_bar {
width: 8px;
height: 30px;
background-color: red;
position: absolute;
}
<div id="cont">
<div id="p_bar"></div>
</div>
<p id="write"></p>

var x=document.getElementById("p_bar");
var wid = 1;
var it = setInterval(function(){
if(wid <= 800){
wid+=8;
x.style.width=wid+"px";
}else{
clearInterval(it);
}
}, 1000);
document.body.style.background = "#"+((1<<24)*Math.random()|0).toString(16);
#cont{
width: 800px;
height: 30px;
background-color: cornsilk;
position: relative;
}
#p_bar{
width: 8px;
height: 30px;
background-color: red;
position: absolute;
}
<div id="cont">
<div id="p_bar"></div></div>
<p id="write"></p>
If you want to see moving progress bar, You should use setInterval().
If you use just for, you can't see any animation.
Because, computer's calculating is so fast, so you can see only the result of for

I wrote it again using functions, try this shubham:
var x = document.getElementById('p_bar');
var container = document.getElementById('cont');
var write = document.getElementById('write');
var containerWidth = container.offsetWidth;
var currentWidth = x.offsetWidth;
var compeleteProgress = function (step, every) {
currentWidth = Math.min(currentWidth + step, containerWidth);
write.innerHTML = Math.floor((currentWidth / containerWidth) * 100) + '%' // Priniting percentage
x.style.width = currentWidth + 'px'
if (currentWidth < containerWidth) setTimeout(function () {
compeleteProgress(step, every)
}, every)
}
compeleteProgress(8, 300) // When you call this function, everything starts
document.body.style.background = "#"+((1<<24)*Math.random()|0).toString(16);
#cont{
width: 800px;
height: 30px;
background-color: cornsilk;
position: relative;
}
#p_bar{
width: 8px;
height: 30px;
background-color: red;
position: absolute;
}
<div id="cont">
<div id="p_bar"></div>
</div>
<p id="write"></p>

I am not sure what behavior you really expects. The Bar size is usually changed according to any application events (in my example by timeouts). I hope this helps:
document.body.style.background = "#"+((1<<24)*Math.random()|0).toString(16);
var setBarWidthInPercent = function(barId, value){
var bar=document.getElementById(barId);
bar.style.width = value+"%";
}
setTimeout(function(){
setBarWidthInPercent("p_bar",10)
},500)
setTimeout(function(){
setBarWidthInPercent("p_bar",50)
},1500)
setTimeout(function(){
setBarWidthInPercent("p_bar",100)
},3000)
#cont{
width: 800px;
height: 30px;
background-color: cornsilk;
position: relative;
}
#p_bar{
width: 8px;
height: 30px;
background-color: red;
position: absolute;
-webkit-transition: width 1s ease-in-out;
-moz-transition: width 1s ease-in-out;
-o-transition: width 1s ease-in-out;
transition: width 1s ease-in-out;
}
<div id="cont">
<div id="p_bar"></div></div>
<p id="write"></p>

Changing Div content of fixed div using jquery scrollify

I have a fixed DIV and 3 sections A,B,C.
I'm using jquery scrollify for changing data of sections and I want to change specific div data on scroll of mouse wheel.
As you know, scrollify allow us to scroll a section on mouse wheel rotation, when section change I need to update that fixed div data withn respective section contents
section height and width will be screen height and screen width,
I asked almost the same question with using scrollify website example and I didnt get any response, so I decided to ask again with graphical example

This is parallax what you need to do is to look at this example
http://codepen.io/hudsonmarinho/pen/FHGeK
function scrollFooter(scrollY, heightFooter)
{
console.log(scrollY);
console.log(heightFooter);
if(scrollY >= heightFooter)
{
$('footer').css({
'bottom' : '0px'
});
}
else
{
$('footer').css({
'bottom' : '-' + heightFooter + 'px'
});
}
}
$(window).load(function(){
var windowHeight = $(window).height(),
footerHeight = $('footer').height(),
heightDocument = (windowHeight) + ($('.content').height()) + ($('footer').height()) - 20;
// Definindo o tamanho do elemento pra animar
$('#scroll-animate, #scroll-animate-main').css({
'height' : heightDocument + 'px'
});
// Definindo o tamanho dos elementos header e conteúdo
$('header').css({
'height' : windowHeight + 'px',
'line-height' : windowHeight + 'px'
});
$('.wrapper-parallax').css({
'margin-top' : windowHeight + 'px'
});
scrollFooter(window.scrollY, footerHeight);
// ao dar rolagem
window.onscroll = function(){
var scroll = window.scrollY;
$('#scroll-animate-main').css({
'top' : '-' + scroll + 'px'
});
$('header').css({
'background-position-y' : 50 - (scroll * 100 / heightDocument) + '%'
});
scrollFooter(scroll, footerHeight);
}
});
#scroll-animate
{
overflow: hidden;
}
#scroll-animate-main
{
width: 100%;
left: 0;
position: fixed;
}
#heightPage,
#heightScroll
{
width: 10px;
top: 0;
position: absolute;
z-index: 99;
}
#heightPage
{
left: 0;
}
#heightScroll
{
right: 0;
}
header
{
width: 100%;
height: 100%;
background: url(https://raw.githubusercontent.com/hudsonmarinho/header-and-footer-parallax-effect/master/assets/images/bg-header.jpg) no-repeat 50% 50%;
top: 0;
position: fixed;
z-index: -1;
}
footer
{
width: 100%;
height: 300px;
background: gray;
bottom: -300px;
position: fixed;
z-index: -1;
}
.content
{
height: 1000px;
min-height: 1000px;
background: #ededed;
position: relative;
z-index: 1;
}
.wrapper-parallax {
margin-top: 100%;
margin-bottom: 300px;
box-shadow: 0px 0px 20px rgba(0, 0, 0, 0.5);
}
h1{
width: 100%;
height: 100%;
padding: 0;
margin: 0;
text-transform: uppercase;
text-align: center;
font-family: Helvetica;
font-size: 150px;
color: #fff;
}
header h1{}
.content h1{
line-height: 1000px;
color: #999;
}
footer h1
{
line-height: 300px;
}
header,
footer,
#scroll-animate-main
{
-webkit-transition-property: all;
-moz-transition-property: all;
transition-property: all;
-webkit-transition-duration: 0.4s;
-moz-transition-duration: 0.4s;
transition-duration: 0.4s;
-webkit-transition-timing-function: cubic-bezier(0, 0, 0, 1);
-moz-transition-timing-function: cubic-bezier(0, 0, 0, 1);
transition-timing-function: cubic-bezier(0, 0, 0, 1);
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="scroll-animate">
<div id="scroll-animate-main">
<div class="wrapper-parallax">
<header>
<h1>Header</h1>
</header>
<section class="content">
<h1>Content</h1>
</section>
<footer>
<h1>Footer</h1>
</footer>
</div>
</div>
</div>

Fixing the right button of a vanilla Javascript carousel

Against all reason, I'm trying to create a vanilla JavaScript carousel.
I am having two problems:
1. The images move left at widths of -680px as they should but when I tried to create the same function for the right button, the left value goes to 1370px making the picture off the screen.
2. I would like for it to slide left rather jump left (same for right), I managed to get it to do this but it doesn't work on the first slide, only from the second slide.
Here is the HTML code just for the carousel:
<div id = "container">
<div id = "carousel">
<div class = "slide"><img class = "slideImage" class = "active" src = "sithCover.png"></div>
<div class = "slide"><img class = "slideImage" src = "darthVader.png"></div>
<div class = "slide"><img class = "slideImage" src = "darthSidious.png"></div>
<div class = "slide"><img class = "slideImage" src = "kyloRen.png"></div>
</div>
</div>
<div id = "left" class = "button"></div>
<div id = "right" class = "button"></div>
Here is the CSS code:
#container {
position: absolute;
top: 200px;
left: 100px;
width: 680px;
height: 360px;
white-space: nowrap;
overflow:hidden;
}
#carousel {
position: absolute;
width: 2740px;
height: 360px;
white-space: nowrap;
overflow: hidden;
transition: left 300ms linear;
}
.slide {
display: inline-block;
height: 360px;
width: 680px;
padding: 0;
margin: 0;
transition: left 300ms linear;
}
.slideImage {
position:relative;
height: 360px;
width: 680px;
float: left;
}
.button {
position: absolute;
top: 340px;
height: 60px;
width: 60px;
border-bottom: 12px solid red;
}
#left {
left: 115px;
border-left: 12px solid red;
transform: rotate(45deg);
}
#right {
left: 693px;
border-right: 12px solid red;
transform: rotate(-45deg);
}
Here is the JavaScript:
var carousel = document.querySelector('#carousel');
var firstVal = 0;
document.querySelector('#left').addEventListener("click", moveLeft);
function moveLeft (){
firstVal +=685;
carousel.style.left = "-"+firstVal+"px";
};
document.querySelector('#right').addEventListener("click", moveRight);
function moveRight() {
firstVal +=685;
carousel.style.left = "+"+firstVal+"px";
};
Here is a JSFiddle so that you can see what I mean:
"https://jsfiddle.net/way81/8to1kkyj/"
I appreciate your time in reading my question and any help would be much appreciated.

Ofcourse it goes from -685px on left click and then to +1370pxthe next right click; You are always adding 685 to your firstVal variable.
firstVal = 0
//firstVal is worth 0
moveLeft()
//firstVal is now worth 685
moveRight()
//firstVal is now worth 1370.
The problem is that when you apply the firstVal to your CSS thing in the javascript, you create a string to get your negative value (where you apply the "-" sign infront of firstVal)
Instead, write them like this
function moveLeft (){
firstVal -=685; //note we now subtract, the "-" should appear when the number becomes negative
carousel.style.left = firstVal + "px";
};
function moveRight() {
firstVal +=685;
carousel.style.left = firstVal + "px";
};

var left = document.getElementById("left");
left.addEventListener("click", moveLeft, false);
var right = document.getElementById("right");
right.addEventListener("click", moveRight, false);
var carousel = document.getElementById("carousel");
var images = document.getElementsByTagName("img");
var position = 0;
var interval = 685;
var minPos = ("-" + interval) * images.length;
var maxPos = interval * images.length;
//slide image to the left side <--
function moveRight() {
if (position > (minPos + interval)) {
position -= interval;
carousel.style.left = position + "px";
}
if (position === (minPos + interval)) {
right.style.display = "none";
}
left.style.display = "block";
}
//slide image to the right side -->
function moveLeft() {
if (position < (maxPos - interval) && position < 0) {
position += interval;
carousel.style.left = position + "px";
}
if (position === 0) {
left.style.display = "none";
}
right.style.display = "block";
}
#container {
position: absolute;
top: 200px;
left: 100px;
width: 680px;
height: 360px;
white-space: nowrap;
overflow: hidden;
}
#carousel {
position: absolute;
width: 2740px;
height: 360px;
white-space: nowrap;
overflow: hidden;
transition: left 300ms linear;
}
.slide {
display: inline-block;
height: 360px;
width: 680px;
padding: 0;
margin: 0;
transition: left 300ms linear;
}
.slideImage {
position: relative;
height: 360px;
width: 680px;
float: left;
}
.button {
position: absolute;
top: 340px;
height: 60px;
width: 60px;
border-bottom: 12px solid red;
}
#left {
left: 115px;
border-left: 12px solid red;
transform: rotate(45deg);
display: none;
}
#right {
left: 693px;
border-right: 12px solid red;
transform: rotate(-45deg);
}
<div id="container">
<div id="carousel">
<div class="slide">
<img class="slideImage" class="active" src="sithCover.png" alt="slide1">
</div>
<div class="slide">
<img class="slideImage" src="darthVader.png" alt="slide2">
</div>
<div class="slide">
<img class="slideImage" src="darthSidious.png" alt="slide3">
</div>
<div class="slide">
<img class="slideImage" src="kyloRen.png" alt="slide4">
</div>
</div>
</div>
<div id="left" class="button"></div>
<div id="right" class="button"></div>

Cross fade background-image with jQuery

so I have some images and I would like to show them as a slideshow in the background. However, I want the image to cross-fade between the current image and the next image. So far, I have only been able to switch between the images:
$(document).ready(function () {
var images = ["landing_background_1.jpg", "landing_background_2.jpg", "landing_background_3.jpg", "landing_background_4.jpg"];
var currentImage = 0;
function changeBackgroundImage() {
$("html").fadeIn().css({
"background-image": "url('img/backgrounds/" + images[++currentImage] + "')",
});
if (currentImage >= images.length - 1) {
//set it back to the begining
currentImage -= images.length;
}
}
setInterval(changeBackgroundImage, 1500);
});
Any help would be much appreciated! :)

What you have to do is layer two element on top of each other. Then have one fadeout and the other fadein.
Here is how I would go about doing it ...
css ...
#background-images {
position: fixed;
top: 0;
left: 0;
width: 100%;
height: 100%;
z-index: 1;
}
#bImg1 {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
z-index: 3;
background: url(starting-img1.jpg) no-repeat;
background-size: contain;
}
#bImg2 {
display: none;
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
z-index: 2;
background: url(starting-img2.jpg) no-repeat;
background-size: contain;
}
.container {
width: 960px;
height: 900px;
background: rgba(255,255,255,.7);
margin: auto;
position: relative;
z-index: 10;
}
The html ...
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
<html>
<body>
<div id="background-images">
<div id="bImg1"></div>
<div id="bImg2"></div>
</div>
<div class="container">
Content Here
</div>
</body>
</html>
The script ...
var imageSet1 = ["image1.jpg", "image2.jpg", "image3.jpg"];
var currentImageSet1 = 0;
var imageSet2 = ["image4.jpg", "image5.jpg", "image6.jpg"];
var currentImageSet2 = 0;
function changeBackgroundImages() {
img1Fade();
setTimeout(img2Fade, 2000);
}
function img1Fade(){
$('#bImg1').fadeOut('slow', function(){$('#bImg1').css({background: 'url(' + imageSet1[++currentImageSet1] + ')'})});
$('#bImg2').fadeIn('slow');
if (currentImageSet1 >= imageSet1.length - 1) {
currentImageSet1 -= imageSet1.length;
};
}
function img2Fade(){
$('#bImg2').fadeOut('slow', function(){$('#bImg2').css({background: 'url(' + imageSet2[++currentImageSet2] + ')'})});
$('#bImg1').fadeIn('slow');
if (currentImageSet2 >= imageSet2.length - 1) {
currentImageSet2 -= imageSet2.length;
};
}
$(document).ready(function(){
setInterval(changeBackgroundImages, 5000);
});
You will need to mess with the timing to get it to look good. Make sure to set your urls to the images in the image array or when the sting in the css is built.

I've spent a lot of time to find the most clean and easy way.
This finally works:
var i=0;
var imghead=[
"url(http://yoururl.com/picture0.jpg)",
"url(http://yoururl.com/picture1.jpg)"
];//add as many images as you like
function slideimg() {
setTimeout(function () {
jQuery('#element').css('background-image', imghead[i]);
i++;
if(i==imghead.length) i=0;
slideimg();
}, 6000);
}
slideimg();
#element{
height: 100%;
overflow: hidden;
opacity: 1.0;
-webkit-transition: background-image 1.5s linear;
-moz-transition: background-image 1.5s linear;
-o-transition: background-image 1.5s linear;
-ms-transition: background-image 1.5s linear;
transition: background-image 1.5s linear;
}

Easier:
var current = 1;
function anim() {
if(current == 4) {current = 1; }
$('#bImg'+ current).fadeOut(3000);
++current;
$('#bImg'+ current).fadeIn(3000);
setTimeout(anim, 8000);
}
anim();
html:
<div class="inside" >
<div id="bImg2"></div>
<div id="bImg3"></div>
</div>
css:
.inside {
background:url(top_01.jpg) no-repeat center top ;
}
#bImg2 {
position: absolute;
top: 0px;
width: 100%;
background:url(top_02.jpg) no-repeat center top ;
display: none;
}
#bImg3 {
position: absolute;
top: 0px;
width: 100%;
background:url(top_03.jpg) no-repeat center top ;
display: none;
}