Develop Reference

Eliminate horizontal scroll of a relative positioned div

I want to keep a div (id='fixedDiv') at the top of the window while the user scrolls up and down the webpage. The page has another much taller div (id='tallDiv'). I want the user to scroll the page up and down to see the content of tallDiv, and fixedDiv to always be displayed at the top of the window during the scrolling.
The problem is if the user does a horizontal scroll, tallDiv appears to move left or right, while fixedDiv stays put. My question is how do I keep tallDiv from "moving?"
I tried to detect a horizontal scroll in the $(window).scroll event by keeping track of $(document).scrollLeft() and setting tallDiv's position to 'fixed' during a horizontal scroll. I then use a timer to set tallDiv's position back to 'relative' But that gets ugly.
Does anyone have any ideas on how I can accomplish what I want? My code follows:
function SetScrollable() {
$('#tallDiv').css('position', 'relative');
}
var lastScrollLeft;
$(window).scroll(function (event) {
// what the y position of the scroll is
var documentScrollLeft = $(document).scrollLeft();
if (lastScrollLeft != documentScrollLeft) {
lastScrollLeft = documentScrollLeft;
$('#tallDiv').css('position', 'fixed');
setTimeout('SetScrollable()', 500);
}
else {
$('#tallDiv').css('position', 'relative');
}
});
<form id="form1" runat="server">
<div id="fixedDiv" style="position:absolute;background-color:yellow; height:40px; width:40px;" >
</div>
<div id="tallDiv" style="position:relative; left:300px; top:0px; background-color:green; height:400px; width:40px;" >
</div>
</form>

can you position the tallDiv absolute and right aligned? (ex:position absolute; right: 100px;)

Bring an element to top of the page even if the page does not scroll

Background:
Let's say you have a simple page which has a logo and a heading only and one paragraph
<img src="http://blog.stackoverflow.com/wp-content/uploads/StackExchangeLogo1.png">
<h1>Foo Bar</h1>
<p>ABC12345</p>
This is how that looks like
That page, obviously would not have vertical overflow / scroll bar for almost even tiny scale mobile devices, let alone computers.
Question
How can you bring that heading to the top left of the screen and move the logo out of focus unless someone scrolls up? Open to using any JavaScript library and any CSS framework
Attempts:
Tried using anchors but they only work if the page already had a scroll bar and anchor was out of focus.
Tried window.scrollTo but that also requires the page to have scroll already
Tried $("html, body").animate({ scrollTop: 90}, 100); but that also doesn't work when the page doesn't have overflow
Notes:
Please note that adding some extra <br/> to induce an overflow is not the way to go, it can be done that way but that's a very ordinary workaround
Why is it needed?
Its for a form for mobile devices, simple requirement is to take the first field of the form to top of the page and hide the logo (one can scroll up if they wish to see it) so it doesn't take attention away. Not using jQueryMobile for this particular task.

If you want the user to be able to scroll up and see the logo, then the logo must be within the top boundary of the body tag, because anything outside of that tag will not be viewable. This means you cannot use negative margins or offsetting like that. The only way to achieve this is to have the page scroll to the desired location that is within the top boundary of the body tag. You can set the time for this event to one millisecond, but there will still be a 'jump' in the page when it is loaded. So, the logic is: first make sure the page is long enough to scroll to the right place, then scroll there.
//Change the jQuery selectors accordingly
//The minimum height of the page must be 100% plus the height of the image
$('body').css('min-height',$(document).height() + $('img').height());
//Then scroll to that location with a one millisecond interval
$('html, body').animate({scrollTop: $('img').height() + 'px'}, 1);
View it here.
Alternatively, you can load the page without the image in the first place. Then your form field will be flush with the top of the document. Then you could create the element at the top and similarly scroll the page again. This is a round-a-bout way of doing the same thing though. And the page will still 'jump,' there is no way around that.

Only CSS and anchor link solution
With a pseudo element :
--- DEMO ---
First :
set : html,body{height:100%;}
Second :
Choose one of your existing tags. This tag mustn't have a relatively positioned parent (except if it is the body tag). Preferably the first element in the markup displayed after the logo. For your example it would be the h1 tag. And give it this CSS :
h1:before {
content:"";
position:absolute;
height:100%;
width:1px;
}
This creates an element as heigh as the viewport area. As it is displayed under the logo, the vertical scroll lenght is the same as the logo height.
Third :
Give the first element after logo an id (for this example I gave id="anchor").
Then you can use a link like this your_page_link#anchor and you will automaticaly scroll to the anchor (logo outside/above the viewport).
This works whatever height the logo is.
link to editable fiddle
Full code :
HTML
<img src="http://blog.stackoverflow.com/wp-content/uploads/StackExchangeLogo1.png">
<h1 id="anchor">Foo Bar</h1>
<p>ABC12345</p> Anchor link
CSS
html, body {
height:100%;
margin:0;
padding:0;
}
h1:before {
content:"";
position:absolute;
width:1px;
left:0;
height:100%;
}

You might need to add js functionality to hide the logo if user scrolls down but I guess following code will fullfill the first requirement.
Please see
<script src="js/jquery.js"></script>
<img id='logo' src="http://blog.stackoverflow.com/wp-content/uploads/StackExchangeLogo1.png" style="display:none">
<h1>Foo Bar</h1>
<p>ABC12345</p>
<script type="text/javascript">
var p = $( "p:first" );
var isScrolled=false;
/* For Firfox*/
$('html').on ('DOMMouseScroll', function (e) {
isScrolled = true;
if(p.scrollTop()==0 && isScrolled==true){
$('#logo').css('display','block');
}
});
/* For Chrome, IE, Opera and Safari: */
$('html').on ('mousewheel', function (e) {
isScrolled = true;
if(p.scrollTop()==0 && isScrolled==true){
$('#logo').css('display','block');
}
});
</script>
I have referred this question to find solution.

You could use touchmove event to detect swipe up or down. This is my example. You can try it on mobile device.
<style>
#logo {
position: absolute;
top: -100%;
-webkit-transition: top 0.5s;
-moz-transition: top 0.5s;
-ms-transition: top 0.5s;
-o-transition: top 0.5s;
transition: top 0.5s;
}
#logo.show {
top: 0;
}
</style>
<script>
var perY;
var y;
$(window).on('touchmove', function(e) {
e.preventDefault();
y = window.event.touches[0].pageY;
if(!perY)
perY = y;
else
{
if(y > perY)
$('#logo').addClass('show');
else
$('#logo').removeClass('show');
perY = null;
}
});
</script>
<img id="logo" src="http://blog.stackoverflow.com/wp-content/uploads/StackExchangeLogo1.png">
<h1>Foo Bar</h1>
<p>ABC12345</p>

This is the same problem i've encountered hiding the addressbar without the page overflowing. The only solution that fitted my needs was the following:
Set the min-height of the body to the viewportheight + your logo.
$('body').css('min-height', $(window).height() + 200);

This is a simple solution of getting the height of the contents to see if we can scroll to the part of the header, if not, we add height to the paragraph.
<img id="img" src="http://blog.stackoverflow.com/wp-content/uploads/StackExchangeLogo1.png" />
<h1 id="h" >Foo Bar</h1>
<p id="par" style="background:yellow;">
hello world
</p>
script:
function hola(){
var imgH = $("#img").outerHeight(true);
var titleH = $("#h").outerHeight(true);
var winH = $(window).height();
var parH = $('#par').outerHeight(true);
var contH = (imgH + titleH + parH);
var wishH = (imgH + winH);
console.log("wished height: " + wishH);
console.log("window height: " + winH);
console.log("content height: " + contH);
if(contH < wishH){
console.log("window is smaller than desired :(");
var newH = wishH - contH;
$("#par").height(parH + newH);
$(window).scrollTop(imgH);
}
}
Here is the working example:
http://jsfiddle.net/Uup62/1/

You may like this solution: http://jsfiddle.net/jy8pT/1/
HTML:
<div class="addScroll"></div>
<h1 class="logo"><img src="https://drupal.org/files/images/OQAAAI1PPrJY0nBALB7mkvju3mkQXqLmzMhxEjeb4gp8aujEUQcLfLyy-Sn4gZdkAas6-k8eYbQlGDE-GCjKfF5gIrUA15jOjFfLRv77VBd5t-WfZURdP9V3PdmT.png" height="100" alt="company logo"/></h1>
<h2>This is a sample page heading.</h2>
<p>This is a sample page text.</p>
JS:
function addScroll()
{
$(".addScroll").css({
"height": ($(window).height()+1) + "px",
"width": "100%"
});
}
$(document).ready(function(){
addScroll();
$(window).resize(function(){
addScroll();
});
$(window).scroll(function(){
if($(window).scrollTop() > 0)
{
$(".logo").animate({
marginTop: "-110px"
}, 500);
}
if($(window).scrollTop() == 0)
{
$(".logo").animate({
marginTop: "0"
}, 500);
}
});
});
CSS:
body
{
padding:0;
margin:0;
}
h1.logo
{
display:block;
margin:0 0 10px 0;
padding:0;
outline:0;
}
.addScroll
{
position:absolute;
display:block;
top:0;
left:0;
z-index:-1;
}

how to "fix" container element height when scrollbar shows?

I have a horizontal scrollbar which will only show when hover. But the problem is when it shows, it will increase the height of it's container and push the following elements down.
the demo examle.you can see the two div will be pushed down when the scrollbar shows
<div class="wrapper">
<div class="one">
<div class="oneChild">the height is unknown,the height is unknown,the height is unknown,the height is unknown</div>
</div>
<div class="two">I'm two</div>
There are are some rules:
The wrapper and one height can't be fixed,because the *oneChild * content height is unkonwn.And the height of both are all decided by their children.
The scroball only show when hover.you can use js or css to control it's visible.
Any js/css solution will be welcome.

If jquery is an option:
$(document).ready(function() {
height = $('.one').height();
$('.two').css('marginTop', height + 'px');
});
css:
.one {
width: 100px;
border: 1px seagreen solid;
position:relative;
}
.one:hover {
overflow: scroll;
}
.two {
position: absolute;
top:30px;
}

If the child of one will never change, then you could get the height of the element after a height has been set, and then fix it at that height.
var $one = $('.one');
var height = $one.height();
$one.css('height', height);
If the height of the child of one may change, you could fix the height when you are hovering over the element, and set it to auto when you stop hovering.
var $one = $('.one');
var height = $one.height();
$one.on('mouseenter', function() {
$one.css('height', height);
});
$one.on('mouseleave', function() {
$one.css('height', 'auto');
});

You can set the height of the div on hover to the height when the scrollbar isn't there. Assuming that jQuery is ok:
$(document).ready(function() {
var oneHeight = $('.one').height();
$('.one').hover(
function(){ $(this).height(oneHeight); },
function(){ $(this).height(oneHeight); }
);
});
This does add an unfortunate vertical scrollbar, but if you want the vertical position to stay the same, you need to have the vertical bar to see the content that the horizontal scroll bar.

My solution is:add padding-bottom first ,it is as high as horizontal scroball,then when mouseover event happen,padding-bottom set zero.

How to get the div top position value while scrolling

I am trying to run some script when div reaches to a certain point when it's scrolled. There is a fixed navigation and when the user scrolls the window it suppose change the nav name once it reaches close to the nav. I am using the $(window).scroll function but it only checking the div position once and not updating the value. How to make scroll check the window size every 5-10 px move so that it doesn't take too much memory/processing.
The code is set up at: http://jsfiddle.net/rexonms/hyMxq/
HTML
<div id="nav"> NAVIGATION
<div class="message">div name</div>
</div>
<div id="main">
<div id="a">Div A</div>
<div id ="b"> Div B</div>
<div id ="c"> Div C</div>
</div>​
CSS
#nav {
height: 50px;
background-color: #999;
position:fixed;
top:0;
width:100%;
}
#main{
margin-top:55px;
}
#a, #b, #c {
height:300px;
background-color:#ddd;
margin-bottom:2px;
}
SCRIPT
$(window).scroll(function() {
var b = $('#b').position();
$('.message').text(b.top);
if (b.top == 55) {
$('.message').text("Div B");
}
});​

Try this jsFiddle example
$(window).scroll(function() {
var scrollTop = $(window).scrollTop(),
divOffset = $('#b').offset().top,
dist = (divOffset - scrollTop);
$('.message').text(dist);
if (b.top == 55) {
$('.message').text("Div B");
}
});​
Your original code was only checking the position of the div relative to the top of the document which never changes. You need to calculate in the amount of scroll the window has incurred and calculate accordingly.
Also note the difference beyween jQuery's .position() and .offset() methods. The .position() method allows us to retrieve the current position of an element relative to the offset parent. Contrast this with .offset(), which retrieves the current position relative to the document.

Why does my JS code act so intermittently?

The JS code below is meant to get the height of the browser and the height of the .banner div. If the banner height is greater than the browser height, append two divs (.title and .social) to the body otherwise don't do anything and leave .title and .social divs where they are.
I'm also wanting the .title and .social divs to fade out when a user scrolls down the page and fade in when they get back to the top of the page.
The problem
This code does work but not all the time. Sometimes it will display correctly other times it won't. By that I mean the height of div.banner can be greater than the height of the browser window yet .title and .social will not be appended to the body. Is there anything wrong with this code that could cause this issue to occur?
$(document).ready(function () {
// fade in/fade out banner titles
$(window).trigger('scroll');
var divs = $('.social, div.banner .title');
$(window).scroll(function(){
if($(window).scrollTop() < 10){
divs.fadeIn("fast");
} else {
divs.fadeOut("fast");
}
});
// Position feature image title and social icons according to browser window height
var windowHeight = $(window).height(); // Gets browser viewport height
var bannerHeight = $(".banner").height(); // Gets .banner height
if (bannerHeight > windowHeight) {
$("body").append($('.banner .title'));
$("body").append($('.social'));
}
else {
//Display .title and .social in .banner div (as originally in HTML)
}
});
My HTML code that is on page load for reference:
<div class="banner y1">
<div class="title" id="feature-title">
<!-- title content here -->
</div>
<div class="social" id="feature-social">
<!-- social content here -->
</div>
</div>

If height changes on images you should use onload method.
http://api.jquery.com/load-event/