I know this topic has been posted quite often already, but none of the solutions presented have been of any help to me by far. I have a sidebar on the left side of my page, which I assigned position:fixed in CSS, and which I would like to scroll horizontally (along with all the other content on my page)
For my header and footer I solved the issue like this:
$(window).scroll(function ()
{
$("header,footer").css('margin-left', -($(window).scrollLeft()) + "px");
});
But this doesn't do it properly for my sidebar.
This is the html for my sidebar:
<div class="fullscreen_block hided">
<div class="left-sidebar-block">
and CSS:
.left-sidebar-block {
position: fixed;
margin-left: 70px;
}
Can anybody show me how I can fix this without using the above JS code? (any other JS or CSS or jQuery is fine)
Thanks!!
First off, I think you want to use scrollTop instead of scrollLeft. From your description, it sounds like you want to have an element slide to the left as the user scrolls down. scrollTop will give you the distance the user has scrolled.
Second, I recommend using the transform property instead of the margin property, as long as it meets your browser support requirements. Scrolling tricks are often performance intensive so you should try to use high performance css properties like transform and opacity rather than slower properties like margin, left, and display.
The following code does what I think you are trying to do. (Codepen demo: http://codepen.io/regdoug/pen/yyYvaV):
$(window).scroll(function ()
{
var top = $(window).scrollTop();
$("left-sidebar-block").css('transform', 'translateX(' + (-top) + "px)")
.css('-ms-transform', 'translateX(' + (-top) + "px)")
.css('-webkit-transform', 'translateX(' + (-top) + "px)");
});
References
http://www.html5rocks.com/en/tutorials/speed/scrolling/
http://css-tricks.com/almanac/properties/t/transform/
http://caniuse.com/#feat=transforms2d
Your problem is not really clear.. but I think you shoukd better play with the "left" attribute rather than "margin-left". Margins won't have any effect on a fixed element..
Related
I'm trying to figure out how to make the main visible content area expand to the height of the browser-- it's responsive in a sense. If you extend the browser, more of the content shows. If you scroll down, it scrolls to the next div and repeats the behavior.
I have no idea what this behavior is called or referred to as, so I'm not sure I can give an accurate title.
My guess is that this is done with Javascript, but I'm not well-versed in the language by any means. Can someone help me out here?
Examples:
http://theartofraw.g-star.com &
http://www.apple.com/iphone-5s/
I've done this with Jquery. Basically you get the height of the window and then set the height of each slide to that value.
var origheight = $(".slide").height();
var height = $(window).height();
if (height > origheight) {
$(".slide").height(height);
}
http://jsfiddle.net/uYXvF/
They have sections, that are CSS "height: 100%";
Then they detect scrolling and, do a CSS3 Transform with CSS3 Transition:
Transform: Y: 0%
Scrolling Detected
Transform: Y: 100%
So they are basically preventing actual scrolling and instead move the whole content by 100%.
Edit (2):
In this post they show how to disable scrolling:
How to disable scrolling temporarily?
function wheel(e) {
preventDefault(e);
document.getElementById("mainContainer").style.webkitTransition = "-webkit-transform 1s";
document.getElementById("mainContainer").style.webkitTransform = "translateY(-100%)";
}
This is a simplified version from what i use on my own page.
If you want to accomplish the same as in the example sites you posted, then you could make use of a jQuery plugin called fullPage.js.
I have a project where the requirement is to move the footer ( #footer ) upward while scrolling down the page in a parallax-like effect. When you start scrolling down the page, the footer should start moving upward only until it's visible in the (bottom part of the) viewport.
The footer should have covered most of the preceding <div> half way up and in full when it has reached the top of the viewport.
The page may have a similar html structure like this :
<body>
<div id="sectionA" class="div">First section</div>
<div id="sectionB" class="div">Second section</div>
<div id="sectionC" class="div">Third section
<div class="box"></div>
<div class="box"></div>
<div class="box"></div>
</div>
<div id="footer" class="div cf">Footer</div>
</body>
The parallax-like effect is achieved via javascript/jQuery adding a dynamic negative value to the top CSS property of the (relative positioned) footer. Here is the code for what it matters :
var $window = jQuery(window),
$footer = jQuery("#footer"),
$viewport = window.innerHeight,
$startEffect = $footer.offset().top - $viewport;
function footerParallax() {
var $scrollPos = $window.scrollTop() - $startEffect,
$ratio = 0.6;
$footer.css({
top: -($scrollPos * $ratio)
});
}
$window.scroll(function () {
footerParallax();
});
The (obvious) issue is that as soon as the top property starts getting a negative value, the footer starts moving away from the bottom of the page.
I have prepared a JSFIDDLE and assigned colors to each section and body to make it clearer. The body (dark-red) is visible under the footer after scrolling to the bottom.
What have I tried?
modifying the margin-top instead of the top property: this does the trick, however the preceding <div> that has to be covered by the footer (#sectionC in the example above) overlaps the contents of the footer and breaks its layout regardless that it is not visible due to its z-index property (added some floating boxes in the fiddle to make it evident.... a clearfix hack didn't help either.)
setting a static position to the footer: neither top or margin-top have effect over a static element.
Changing/reducing dynamically the height of #sectionC instead of top of footer to produce the effect of moving the second upwards : the footer stops moving as soon as height is equal to 0 (neither negative size or negative paddings are allowed)
Changed the height dynamically of the html and/or body tags to no avail.
I have also tried some parallax plugins like skrollr and skrollr-stylesheets and some others.
The problem with this solution (same with others) is that it relays in an specific (offset) position of the footer measured in px and set in a data attribute, but if the content changes dynamically, for example using the masonry plugin to arrange elements in another section of the document, the measures become inaccurate and the footer may start moving too early or too late.
By the way, other CSS sticky-footer techniques won't work because, well, they actually push the footer to the bottom of the page, and here we are doing the opposite.
I guess the question is either :
how to keep the footer stick to the bottom of the page while it is moved upwards? - or -
how to reduce the gap to 0 between the end of the document and the bottom edge of the footer?
I am starting to think that this issue has not a real solution the way it is, or maybe I am already too tired to see the obvious. I am interested in learning alternative solutions or hacks via CSS / javascript / jQuery or all of the above.
Bear in mind that I am not asking how to create the parallax effect UNLESS a totally different approach (or tweaks to the existing js code) solves the position issue.
IMPORTANT : Please consider that this is a WP site with an XHTML 1.0 Transitional DOCTYPE, and has installed many other jQuery plugins like masonry, scrollTo, jQuery UI, etc. I may have not control to change many things from the original structure (and I don't want to) so the idea is to implement this without breaking too many things and from a modular script.
EDIT #1 : Added a graphic to clarify the question.
Figure A. shows a regular web page scrolled down to the end. The red square represents the viewport and the footer (grey) is slighted moved to the right for illustration purposes. The body has a reddish background color (not visible in normal conditions) just for illustration purposes too. NOTE: the height of each section as well as the height of the footer is determined by their content (forms, images, text, etc.) so is NOT fixed.
Figure B. shows the current issue: If footer slides up in a parallax-like effect (see JSFIDDLE for reference) while scrolling down the page, it starts covering any preceding section above it (WITHOUT modifying neither its own height or the height of the preceding sections) AND it also starts separating itself from the bottom of the page, therefore the body's color background becomes visible. NOTE: the bigger the viewport is (fullscreen mode for instance) the higher the footer is moved upward (and more content is covered by it)
Figure C. is the expected result: the footer should be stuck to the bottom of the page, in other words, it should be the last visible element after the page has been totally scrolled down (and not the body background as in Figure B.) Notice that the contents and the size of each section (including the footer) should (ideally) remain untouched. Having said that, adding padding bottom to the footer or increasing its height is not the expected result since it would break its original visual layout.
Updated Version
Below is an updated version that should better matches your requirements.
This version goes back to relative positioning for the footer element and uses margin-top to position it.
margin-top is calculated off of the previous elements offset, height and current window scroll position. It then uses either
the viewport height if the footer starts offscreen
the initial top value of the footer element ($startEffect) if the footer started onscreen
to determine the actual value for margin-top.
To help keep the footer's layout from being affected by this, wrapping the content of the footer in an absolutely positioned div did the trick for the sample code provided.
Example Fiddle
CSS:
#footer > div {
position: absolute;
top: 0;
left: 0;
...
}
HTML:
<div id="footer" class="div cf"><div>Footer</div></div>
Code:
var $window = jQuery(window),
$footer = jQuery("#footer"),
$viewport = window.innerHeight,
$startEffect = $footer.offset().top;
$prev = $footer.prev(),
$useStartEffect = $startEffect < $viewport;
function footerParallax() {
var $scrollPos = $window.scrollTop() - $startEffect,
$ratio = 0.6;
var prevOffset = $prev.offset().top + $prev.height() - $window.scrollTop();
var marginTop = 0;
if(prevOffset < $viewport && prevOffset < $startEffect) {
if($useStartEffect) {
marginTop = (prevOffset - $startEffect)*$ratio;
} else {
marginTop = (prevOffset - $viewport)*$ratio;
}
}
$footer.css({
"margin-top": marginTop + 'px'
});
}
$window.scroll(function () {
footerParallax();
});
footerParallax();
How was it solved?
As I mentioned in my question, I was too tired to see the obvious but #dc5's answer put me on the right track :
To help keep the footer's layout from being affected,
wrapping the content of the footer in an absolutely
positioned div does the trick
Based on that comment, the answer became simpler than the whole code he proposed needing only :
(dynamically) wrapping the content of the footer in an absolutely positioned div using jQuery's .wrapInner() method
animating the footer by setting the margin-top property instead of the top property
So this extra CSS :
#footerInnerWrapper {
position: absolute;
top:0;
left:0;
width: 100%;
background-color: #666 /* same as footer */
}
and the tweaked original code
var $window = jQuery(window),
$footer = jQuery("#footer"),
$viewport = window.innerHeight,
$startEffect = $footer.offset().top - $viewport;
// add inner wrapper
$footer.wrapInner('<div id="footerInnerWrapper" />');
function footerParallax() {
var $scrollPos = $window.scrollTop() - $startEffect,
$ratio = 0.6;
$footer.css({
// top: -($scrollPos * $ratio)
marginTop: -($scrollPos * $ratio)
});
}
$window.scroll(function () {
footerParallax();
});
did the trick. See JSFIDDLE
This does what I think you need, the footer sticks when it has scrolled in view entirely:
jsFiddle
Code added:
function footerParallax() {
var $scrollPos = $window.scrollTop() - $startEffect,
$ratio = 0.6,
$newTop = -($scrollPos * $ratio),
$oldTop = parseInt($footer.css('top')),
$nonRelTop = $footer.offset().top - $oldTop,
$wanted = ($window.scrollTop()+$viewport-$footer.height());
if ($nonRelTop + $newTop < $wanted) {
$('#sectionC').css('display', 'none');
$wanted = ($window.scrollTop()+$viewport-$footer.height());
$nonRelTop = $footer.offset().top - $oldTop;
$newTop = $wanted - $nonRelTop;
} else {
$('#sectionC').css('display', 'block');
}
$footer.css('top', $newTop);
}
$window.scroll(footerParallax);
And in the CSS I added this so that $footer.css('top') wouldn't produce NaN:
#footer {
top:0;
/* ... */
}
EDIT: A completely new approach after more clarification of OP. I now have a fixed position footer that starts increasing in height to take over the entire screen when the user has scrolled passed half of the document. The HTML, CSS and Javascript have all been updated to achieve this:
jsFiddle
I have made a rediculasly small snippet to make a sub-header stick to the top.
But since , Like I said - I am by no means a js genious or jQuery genious - and actually far from it - I have my doubts about my own coding abilities..
the demo is here : http://jsfiddle.net/obmerk99/VvKq3/1/
The questions :
1 - there seems to be a lot of plugins (and a lot of questions also
in this very site) with much more code than my snippet - what am i
missing ?? What am I doing wrong ?
2 - will this work cross-browser ?
3 .. and this is a small problem, how to avoid the small "jump" that occurs ?
(if you go to the fiddle, and scroll slowly - you will see that the main div "jumps" when the script is evoked ..
I have tried to add another .pad class to the lower divs -
added class : .pad when script evoked.
.pad{padding-top:42px;}
but it does not seems to work right : http://jsfiddle.net/obmerk99/VvKq3/2/
5 .How can I calculate the real position of the div ? when I try
something like this :
var top = jQuery(window).scrollTop();
var div_top = jQuery('#header_stick').offset().top;
if (top > div_top) // height of float header;
it is jumpy ... http://jsfiddle.net/obmerk99/VvKq3/4/
6 any other suggestions are welcome..
The "jumping" occurs because the element was occupying space in the parent element, and when you change its position to fixed it's suddenly not anymore. I don't know the best way to handle it, but one option would be adding a small span (maybe with a single space) just before your #header_stick, with the same height of it, so when it's class is changed there will still be something there to account for the height difference. (Update: your pad solution is probably the best one, once done right; see below)
Your padding solution might also work, provided that: 1) you remember to remove that class when the user scrolls to the top (in your fiddle I see you adding it, but don't see you removing it); 2) You get the height right - I still couldn't look closely to your code, so I don't know where you got wrong. (Edit: the problem was that your .pad class was using the height of the floating header, not the stick header - fixing that and removing the class yielded what I believe to be the correct result)
About the real position of the div, have you tried subtracting the div's offset from the offset of the parent element? This way you'll have its position relative to the parent (pay attention to things like borders, though - I've recently answered another question where details like this mattered).
Update: your problem here seems to be that, when the position is changed to fixed, the offset also varies wildly. I'd suggest calculating the correct height, once, then storing it somewhere so the scroll function can use it. In other words, don't calculate it while scrolling, that makes it much more difficult to find the right theshold to do the class switch.
Other than that, I think you're code is fine, and I believe it will work cross browsers too (at least standards compliant ones; can't say anything about old versions of IE). Very insightful too, I always wondered how this "trick" worked, now I see it's simpler than I imagined...
You can try this way. I made a shorter version for easier analysis.
fiddle here
<div id="ontop">floating heading</div>
<header>sticky heading</header>
<div id="wrapper">
1<br/>2<br/>3<br/>4<br/>5<br/>6<br/>7<br/>8<br/>9<br/>10<br/>
</div>
#ontop {width:100%; height:80px; background-color:yellow;}
header {width:100%; height:20px; background-color:lightgrey; }
#wrapper {background-color:lightblue; height:5000px;}
.navfixed {position: fixed; top: 0px; z-index: 100; width:100%; display:block; margin-bottom:120px; }
.wrapperBelow{margin-top:22px;}
$(function () {
var elem = $('header'),
wrapperElem = $('#wrapper'),
elemTop = elem.offset().top;
$(window).scroll(function () {
elem.toggleClass('navfixed', $(window).scrollTop() > elemTop);
wrapperElem.toggleClass('wrapperBelow', $(window).scrollTop() > elemTop);
}).scroll();
});
After dabbling in Chrome Extensions I've noticed that when the data inside the Page Action gets to a certain point the scroll bars automatically attach themselves to the popup, this I expect. However, instead of pushing the content to the left of the scroll bar it overlays the content causing a horizontal scrollbar to become active. I ended up just adding a check on my data and applying a css class to push the content to the left more to run parallel to the scroll bar and beside it not under it. What is the correct way to handle this besides my hackish solution?
I was wondering this myself too. Currently I just don't put anything important closer than 20px to the right side of a popup and disable horizontal scrollbars:
body {overflow-x:hidden;overflow-y:auto;}
So when a vertical scrollbar appears the content at least doesn't jump.
Perhaps you need to specify a width on the scrollbar.
::-webkit-scrollbar {
width: 42px; //Do not know actual width, but I assume you do
}
I haven't found a way to do this that isn't a hack, but here's the simplest hack I could think of:
<script type="text/javascript">
function tweakWidthForScrollbar() {
var db = document.body;
var scrollBarWidth = db.scrollHeight > db.clientHeight ?
db.clientWidth - db.offsetWidth : 0;
db.style.paddingRight = scrollBarWidth + "px";
}
</script>
...
<body onresize="tweakWidthForScrollbar()">
The idea is to detect whether the vertical scrollbar is in use, and if it is, calculate its width and allocate just enough extra padding for it.
I have a page layout with an inner <div id="content"> element which contains the important stuff on the page. The important part about the design is:
#content {
height: 300px;
width: 500px;
overflow: scroll;
}
Now when the containing text is larger than 300px, I need to be able to scroll it. Is it possible to scroll the <div>, even when the mouse is not hovering the element (arrow keys should also work)?
Note that I don’t want to disable the ‘global’ scrolling: There should be two scrollbars on the page, the global scrollbar and the scrollbar for the <div>.
The only thing that changes is that the inner <div> should always scroll unless it can’t be moved anymore (in which case the page should start scrolling).
Is this possible to achieve somehow?
Edit
I think the problem was a bit confusing, so I’ll append a sequence of how I would like it to work. (Khez already supplied a proof-of-concept.)
The first image is how the page looks when opened.
Now, the mouse sits in the indicated position and scrolls and what should happen is that
First the inner div scrolls its content (Fig. 2)
The inner div has finished scrolling (Fig. 3)
The body element scrolls so that the div itself gets moved. (Fig. 4)
Hope it is a bit clearer now.
(Image thanks to gomockingbird.com)
I don't think that is possible to achieve without scripting it, which could be messy, considering the numerous events which scroll an element (click, scrollwheel, down arrow, space bar).
An option could be using the jQuery scroll plugin. I know it has the availability to create scrollbars on an div. The only thing you need to add yourself is the logic to catch the events when keyboard buttons are pressed. Just check out the keycodes for the arrow keys and make the div scroll down.
The plugin can be found here.
You can use it like this;
<script type="text/javascript">
// append scrollbar to all DOM nodes with class css-scrollbar
$(function(){
$('.css-scrollbar').scrollbar();
})
</script>
here is a solution that might work: (fiddle: http://jsfiddle.net/maniator/9sb2a/)
var last_scroll = -1;
$(window).scroll(function(e){
if($('#content').scrollTop());
var scroll = $('#view').data('scroll');
if(scroll == undefined){
$('#content').data('scroll', 5);
scroll = $('#content').data('scroll');
}
else {
$('#content').data('scroll', scroll + 5);
scroll = $('#view').data('scroll');
}
/*
console.log({
'window scroll':$('window').scrollTop(),
'scroll var': scroll,
'view scroll':$('#view').scrollTop(),
'view height':$('#view').height(),
'ls': last_scroll
});
//*/
if(last_scroll != $('#content').scrollTop()){ //check for new scroll
last_scroll = $('#content').scrollTop()
$('#content').scrollTop($('#content').scrollTop() + scroll);
$(this).scrollTop(0);
//console.log(e, 'scrolling');
}
})
It is a bit buggy but it is a start :-)
The only way I believe you can achieve this is through the use of frames.
Frames - W3Schools Reference
If you just want to have a fixed positioned "div" and scroll only it, maybe you could use a trick like:
http://jsfiddle.net/3cpvT/
Scrolling with mouse wheel and all kinds of keys works as expected. Only thing is that the scrollbar is on the document body only.
I found a solution... Not perfect... http://jsfiddle.net/fGjUD/6/.
CSS:
body.noscroll {
position: fixed;
overflow-y: scroll;
width: 100%;
}
JS (jQuery):
if ($("body").height() > $(window).height()) {
var top;
$('#scrolldiv').mouseenter(function() {
top = $(window).scrollTop();
$('body').addClass('noscroll').css({top: -top + 'px'});
}).mouseleave(function() {
$('body').removeClass('noscroll');
$(window).scrollTop(top);
});
}
The text wrapping problem can be solved putting the whole content in fixed-width div. There is another bug for IE browser. If the page has center-aligned backgrond, it will move left-right on mouseenter on #scrolldiv