Develop Reference

Reducing fixed header on scroll from top of page

I have a website with a fixed header, on the home page the header contains additional content when you are at the top of the page, but I want to hide this content and have a reduced header as they scroll down the page.
So on the initial scroll i want to hide the additional header content and animate the margin of the content below but keep it so that the top of the content still shows underneath it and then scroll from normal from there.
The snippet below should show what I mean better:
var head_height = $('#header').outerHeight(true);
$('#page_content').css('margin-top', (head_height)+'px');
if($('#extra_header_content').length != 0){
$('#header').addClass('home');
var main_head_height = $("#main_header_content").outerHeight(true);
var extra_head_height = $('#header').outerHeight(true);
$(document).on("scroll", function(){
if($(document).scrollTop() >= main_head_height){
$("#extra_header_content").slideUp("slow");
$('#page_content').css('margin-top', (main_head_height)+'px');
$('#header').removeClass('home');
}else{
$("#extra_header_content").slideDown("slow");
$('#page_content').css('margin-top', (extra_head_height)+'px');
$('#header').addClass('home');
}
});
}else{
$('#header').removeClass('home');
}
div{padding:0px;margin:0px;}
#header{background-color:#d33;position:fixed;top:0px;width:100%;}
.home{background-color:#3d3 !important;}
#main_header_content{height:50px;width:100%;}
#extra_header_content{height:50px;width:100%;}
#page_content{background-color:#33d;height:5000px;width:100%;}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div id="header">
<div id="main_header_content">Main header</div>
<div id="extra_header_content">Extra Header</div>
</div>
<div id="page_content">This should still be visible when header initially reduces</div>

You need to change in your JS code. Margin you are reducing when the page start scrolling need to adjust by padding. So you can try this:
var head_height = $('#header').outerHeight(true);
$('#page_content').css('margin-top', (head_height)+'px');
if($('#extra_header_content').length != 0){
$('#header').addClass('home');
var main_head_height = $("#main_header_content").outerHeight(true);
var extra_head_height = $('#header').outerHeight(true);
$(document).on("scroll", function(){
if($(document).scrollTop() >= main_head_height){
$("#extra_header_content").slideUp("slow");
// $('#page_content').css('margin-top', (main_head_height)+'px');
$('#page_content').css(
{'margin-top': (main_head_height)+'px', 'padding-top': (main_head_height)+'px'}
);
$('#header').removeClass('home');
}else{
$("#extra_header_content").slideDown("slow");
$('#page_content').css('margin-top', (extra_head_height)+'px');
$('#header').addClass('home');
}
});
}else{
$('#header').removeClass('home');
}
div{padding:0px;margin:0px;}
#header{background-color:#d33;position:fixed;top:0px;width:100%;}
.home{background-color:#3d3 !important;}
#main_header_content{height:50px;width:100%;}
#extra_header_content{height:50px;width:100%;}
#page_content{background-color:#33d;height:5000px;width:100%;}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div id="header">
<div id="main_header_content">Main header</div>
<div id="extra_header_content">Extra Header</div>
</div>
<div id="page_content">This should still be visible when header initially reduces</div>

You can do it like this:
var head_height = $('#header').outerHeight(true);
$('#page_content').css('margin-top', (head_height)+'px');
if($('#extra_header_content').length != 0){
$('#header').addClass('home');
var main_head_height = $("#main_header_content").outerHeight(true);
var extra_head_height = $('#extra_header_content').outerHeight(true);
$(document).on("scroll", function() {
const scrollTop = $(document).scrollTop();
if (scrollTop >= head_height) {
$("#extra_header_content").css('height', 0);
$('#page_content').css('margin-top', main_head_height);
$('#header').removeClass('home');
} else if (scrollTop > 0) {
$("#extra_header_content").css('height', extra_head_height - scrollTop);
$('#page_content').css('margin-top', head_height);
$('#header').removeClass('home');
} else {
$("#extra_header_content").css('height', extra_head_height);
$('#page_content').css('margin-top', head_height);
$('#header').addClass('home');
}
});
}else{
$('#header').removeClass('home');
}
div{padding:0px;margin:0px;}
#header{background-color:#d33;position:fixed;top:0px;width:100%;}
.home{background-color:#3d3 !important;}
#main_header_content{height:100px;width:100%;}
#extra_header_content{height:100px;width:100%; overflow: hidden;}
#page_content{background-color:#33d;height:500px;width:100%;}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div id="header">
<div id="main_header_content">Main header</div>
<div id="extra_header_content">Extra Header</div>
</div>
<div id="page_content">This should still be visible when header initially reduces</div>

I can offer you a different approach without JavaScript
body,html{
padding:0;
margin:0;
}
#main-header{
position:fixed;
top:0;
left:0;
right:0;
height: 50px;
background: green;
z-index:3;
}
#extra-header{
position:fixed;
top:50px;
left:0;
right:0;
height: 50px;
background: lime;
z-index: 0;
}
#content{
margin-top:100px;
height:2000px;
position:relative;
z-index:1;
background:blue;
}
#content>div{
height:200px;
background: #efefef;
}
#content>div:nth-of-type(2n){
background: red;
}
<div id="main-header">
Main
</div>
<div id="extra-header">
Extra
</div>
<div id="content">
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
</div>

This could be a solution if you will use position sticky and not fixed, but this a bit jerky, So I will post one more solution here with smooth animation
var head_height = $('#header').outerHeight(true);
//$('#page_content').css('padding-top', (head_height)+'px');
if ($('#extra_header_content').length != 0) {
$('#header').addClass('home');
var main_head_height = $("#main_header_content").outerHeight(true);
var extra_head_height = $('#header').outerHeight(true);
$(document).on("scroll", function() {
if ($(document).scrollTop() >= main_head_height) {
$('#page_content').css('padding-top', (main_head_height) + 'px');
$("#extra_header_content").slideUp("slow");
//$('.page_content_wrapper').addClass('scrolled');
//$('.page_content_wrapper').css('top', (main_head_height)+'px');
$('#header').removeClass('home');
} else {
$("#extra_header_content").slideDown("slow");
$('#page_content').css('padding-top', 0);
//$('.page_content_wrapper').css('top', 0);
//$('#header').addClass('home');
}
});
} else {
$('#header').removeClass('home');
}
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
div {
padding: 0px;
margin: 0px;
}
#header {
background-color: #d33;
position: sticky;
top: 0px;
width: 100%;
z-index: 9;
}
.home {
background-color: #3d3 !important;
}
#main_header_content {
height: 50px;
width: 100%;
}
#extra_header_content {
height: 50px;
width: 100%;
}
#page_content {
background-color: #33d;
height: 5000px;
width: 100%;
}
.page_content_wrapper {
position: relative;
top: 0px;
}
#page_content .page_content_wrapper {
transition: top 1s;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div id="header">
<div id="main_header_content">Main header</div>
<div id="extra_header_content">Extra Header</div>
</div>
<div id="page_content">
<div class="page_content_wrapper">This should still be visible when header initially reduces</div>
</div>
<span class="hamBurger"></span>

Next / previous arrows to cycle through divs

I want to add two arrows to the sides of the "boxes" divs (below) to cycle through the 3 divs.
Working JSFiddle: https://jsfiddle.net/HBHcC/11/
Can someone help me with this?
HTML:
<div class="container">
<div class="boxes">
<div class="one box">
</div>
<div class="two box">
</div>
<div class="three box">
</div>
</div>
</div>
CSS:
.container{
width:100px;
height:100px;
overflow:hidden;
position:relative;
}
.box {
display:inline-block;
float: left;
width: 100px;
height: 100px;
}
.one{
background-color:green;
}
.two{
background-color:red;
}
.three{
background-color:blue;
}
.boxes{
width:400px;
}
JS:
$(document).ready(function(){
$('.box').on("click", function() {
// Is this the last div, or is there a next one?
if ($(this).next().length) {
var animSpeed = 200; // Make this 0 for an instant change
$('.boxes').animate({marginLeft : "-=100"}, animSpeed);
}
});
});

After adding arrows to the div, here is a new fiddle that should get you started:
$('.rightarrow').on("click", function() {
// Is this the last div, or is there a next one?
var animSpeed = 200; // Make this 0 for an instant change
$('.boxes').animate({marginLeft : "-=100"}, animSpeed);
});
$('.leftarrow').on("click", function() {
// Is this the last div, or is there a next one?
var animSpeed = 200; // Make this 0 for an instant change
$('.boxes').animate({marginLeft : "+=100"}, animSpeed);
});
https://jsfiddle.net/tx2yg06w/1/
Updated w/arrows moved out of divs:
$(document).ready(function(){
var animSpeed = 200;
$('.rightarrow').on("click", function() {
if(parseInt($("#boxes").css("marginLeft")) == -200){ return;}
$('.boxes').animate({marginLeft : "-=100"}, animSpeed);
});
$('.leftarrow').on("click", function() {
if(parseInt($("#boxes").css("marginLeft")) == 0){ return;}
$('.boxes').animate({marginLeft : "+=100"}, animSpeed);
});
});
https://jsfiddle.net/b56r0d72/

Errata has given you a good solution. Just wire up his code to the arrows in the snippet below.
Run snippet to view:
<html>
<body>
<style type="text/css">
.leftarrow, .rightarrow {
font-size: 48px;
color: blue;
text-decoration: none;
}
.rightarrow {
color: red;
float: right;
}
.content {
width: 200px;
padding: 4px;
border: 1px gray solid;
}
.box {
height: 200px;
border: 1px green solid;
}
</style>
<div class="content">
<div>
◀
▶
</div>
<div class="box">slide</div>
</div>
</body>
</html>

Jquery animation stuck on load

I have written a note app using Jquery but the container is stuck on load, how i can fix this bug ?
Demo : http://sallibert.com/apps/notes/notes.php
The html (simplified):
<div id="wrapper">
<div id="contentWrapper">
<div id="ntes_left_side">**Notes list and add one**</div>
<div id="ntes_right_side">**Note content and back**</div>
</div>
</div>
Js:
$(document).on('click','#ntesliste li', function(evt) {
$('#contentWrapper').animate({"left": "320px"}, "fast");
$('#zonote').focusout();
fns.textAreaPopulate(+$(this).data('id'),this);
});
$(document).on('click', '#retrlste', function() {
$('#contentWrapper').animate({"left": "0px"}, "fast");
});
$(document).on('click', '#compteurnte #ajouternote', function() {
$('#contentWrapper').animate({"left": "320px"}, "fast");
fns.addNewNote();
});
CSS:
#wrapper{
width:320px;
height:480px;
overflow:hidden;}
#contentWrapper{
width:640px;
height: 480px;
float:left;
position:relative;
}
#ntes_left_side, #ntes_right_side{
width:320px;
height: 480px;
position:absolute;
}
#ntes_right_side{
left:0px;
}
#ntes_right_side{
left:320px;
}

simple fade javascript image rotator

I found this old post asking for a simple fade image rotator:
Looking for a simple fade javascript image rotator
and found what I was looking for:
$(function() {
$('#fader img:not(:first)').hide();
$('#fader img').css('position', 'absolute');
$('#fader img').css('top', '0px');
$('#fader img').css('left', 'auto');
$('#fader img').css('right', 'auto');
//$('#fader img').css('left', '50%');
$('#fader img').each(function() {
var img = $(this);
$('<img>').attr('src', $(this).attr('src')).load(function() {
//img.css('margin-left', -this.width / 2 + 'px');
});
});
var pause = false;
function fadeNext() {
$('#fader img').first().fadeOut().appendTo($('#fader'));
$('#fader img').first().fadeIn();
}
function fadePrev() {
$('#fader img').first().fadeOut();
$('#fader img').last().prependTo($('#fader')).fadeIn();
}
$('#fader, #next').click(function() {
fadeNext();
});
$('#prev').click(function() {
fadePrev();
});
$('#fader, .arwBtn').hover(function() {
pause = true;
},function() {
pause = false;
});
function doRotate() {
if(!pause) {
fadeNext();
}
}
var rotate = setInterval(doRotate, 4000);
});
this was the original fiddle
http://jsfiddle.net/jtbowden/UNZR5/1/
I have already spent some time adapting it (not a jquery programmer :/)
And all I need to add are captions to each picture.
Can someone help me just add captions to that same code?
Really appreciate it : )

You will need to enhance CSS more than this, but it is working as requested
http://jsfiddle.net/dU93C/
CSS
#fader {
position: relative;
width:500px;
height: 400px;
}
#fader div{
position: relative;
height: 400px;
width:400px;
overflow:hidden;
margin:0 auto;
}
#fader strong{
display:block;
position: absolute;
width:100%;
top:0;
left:0;
Background:#333;
Color:#fff;
padding:5px;
opacity:0.7;
filter:alpha(opacity=70);
}
.button {
background-color: green;
width: 50px;
height: 30px;
font-size: 20px;
line-height: 30px;
text-align: center;
position: absolute;
top: 30px;
}
#next {
right: 0;
}
#prev {
left: 0;
}
HTML
<div id="fader">
<a class="button" href="#" id="next">Next</a>
<a class="button" href="#" id="prev">Prev</a>
<div>
<strong>Image 1</strong>
<img src="http://dummyimage.com/600x400/000/fff.png&text=Image1"/>
</div>
<div>
<strong>Image 2</strong>
<img src="http://dummyimage.com/200x400/f00/000.jpg&text=Image2"/>
</div>
<div>
<strong>Image 3</strong>
<img src="http://dummyimage.com/100x100/0f0/000.png&text=Image3"/>
</div>
<div>
<strong>Image 4</strong>
<img src="http://dummyimage.com/400x400/0ff/000.gif&text=Image4"/>
</div>
<div>
<strong>Image 5</strong>
<img src="http://dummyimage.com/350x250/ff0/000.png&text=Image5"/>
</div>
</div>
JS
$(function() {
$('#fader div:not(:first)').hide();
var pause = false;
function fadeNext() {
$('#fader div').first().fadeOut().appendTo($('#fader'));
$('#fader div').first().fadeIn();
}
function fadePrev() {
$('#fader div').first().fadeOut();
$('#fader div').last().prependTo($('#fader')).fadeIn();
}
$('#fader, #next').click(function(e) {
fadeNext();
e.preventDefault()
});
$('#prev').click(function() {
fadePrev();
});
$('#fader, .button').hover(function() {
pause = true;
},function() {
pause = false;
});
function doRotate() {
if(!pause) {
fadeNext();
}
}
var rotate = setInterval(doRotate, 2000);
});

Slide a div off screen (with margin: 0px auto)

I have a horizontally centered div #box1 that has margin: 5px auto that has to slide to the left and off the screen, while #box2 slides into the screen from the right, when the button .class is clicked on. I've seen how its done for absolutely positioned divs, now how do you do it if its not?
HTML Structure
<div class="button">Slide </div>
<div id="container">
<div id="box1" class="box">Box #1</div>
<div id="box2" class="box">Box #2</div>
</div>
Failed attempt
$(".button").click(function() {
$("#box1").css('margin-left', 0);
$("#box1").css('margin-right', 0);
$("#box1").animate({
left: '150%',
}, 'slow' );
});

Is this the effect you're looking for: jsFiddle example.
jQuery:
$(".button").click(function() {
$("#box1").css('margin-left', 0);
$("#box1").css('margin-right', 0);
$("#box1").animate({ left: '-500px' }, 'slow');
$("#box2").animate({ left: '0px' }, 'slow');
});​
CSS:
#box1, #box2 {
margin: 5px auto;
border: 1px solid #999;
position:relative;
}
#box2 {
left:500px;
}
#container {
overflow:hidden;
}
​
HTML:
<div class="button">Slide </div>
<div id="container">
<div id="box1" class="box">Box #1</div>
<div id="box2" class="box">Box #2</div>
</div>​

If you want to slide out a dive you could use jQuery UI hide methods
$(".button").click(function() {
$("#box1").hide('slide', {
direction: "left"
}, 2000);
});
and you can do the same to slide in
$("#box2").show('slide', {
direction: "left"
}, 1000)

Try
$(".button").click(function() {
$("#box1").animate({
marginLeft: '-150%',
}, 'slow' );
});

If you needed to, it wouldn't be difficult to absolutely position the element in the same spot it was before animation.
var elm = $("#box1");
var position = elm.position();
var cssObj = {
'position' : 'absolute',
'top' : position .top,
'left' : position.left
}
elm.css(cssObj);

This might work for you.
$(".button a").click(function() {
var $docWidth = $(window).width();
var $boxOffset = $('#box1').offset();
$("#box1").css('marginLeft', $boxOffset.left);
$("#box1").animate({
marginLeft: $docWidth
}, 'slow');
});
CSS:
#container: { overflow: hidden; }
http://jsfiddle.net/dZUXJ/