I'm using videobox to embed streams into my site, and I just discovered that when videobox is "on"- i.e. I clicked on a link that brings it up and dims everything around it- I can still scroll down and see the rest of my (non-dimmed) site. This breaks immersion, and I'd like to disable the scrolling, but only for when the videobox is on.
I have no idea where to start though.
You can't do this just with JavaScript, as far as I know, as the onscroll event is not cancelable.
You can achieve this by positioning everything in a container div with a height and width of 100% and disabling overflow on html and body elements, so you actually get the scrollbars on the container div. When your videobox is on, you can turn on an overlay that hides everything behind it (including the scrollbars on the container) and display the videobox on top of it.
<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8>
<title>Prevent scrolling</title>
<style>
* { padding: 0; margin: 0; border: 0 }
html, body {
height: 100%;
overflow: hidden;
}
#container {
position: absolute;
height: 100%;
width: 100%;
overflow: auto;
}
#large-div {
background: #aaa;
height: 5000px;
width: 5000px;
}
#overlay {
position: absolute;
background: #fff;
opacity: 0.7;
-moz-opacity: 0.7;
-webkit-opacity: 0.7;
-ms-filter:"progid:DXImageTransform.Microsoft.Alpha(Opacity=70)";
filter: alpha(opacity=70);
height: 100%;
width: 100%;
z-index: 1000;
display: none;
}
#videobox-container {
position: absolute;
background: #dd8;
width: 600px;
height: 400px;
top: 50%;
left: 50%;
margin: -300px 0 0 -200px;
z-index: 1001;
display: none;
}
</style>
</head>
<body>
<div id="container">
<div id="large-div"></div>
</div>
<div id="overlay"></div>
<div id="videobox-container"></div>
<script>
function showVideoBox() {
// show both overlay and videobox-container
document.getElementById("overlay").style.display = "block";
document.getElementById("videobox-container").style.display = "block";
}
showVideoBox();
</script>
</body>
</html>
(You'll have to fiddle a bit with the positions of your elements, but you get the idea.)
The easy solution is to add the css body{overflow:hidden;} when the video starts playing and after that remove it. Also, can you not put the video box in a div tag and set its position to fixed?
in videobox.js
replace line 80
this.overlay.setStyles({'top': window.getScrollTop()+'px', 'height': window.getHeight()+'px'});
with this:
this.overlay.setStyles({top:-$(window).getScroll().y,height:$(window).getScrollSize().y+$(window).getScroll().y});
Essentially this gets the height of the 'y' scroll and rather than just what the screen is showing.
Related
I'm trying to do an effect that hide a div behind other like this page: Canalla Agency. I use two divs and the last one with position fixed, and it's worked, but the div lost the height.
Sorry for my explanation but I'm not good in CSS positioning and Javascript. I hope you can help me and see you soon. Thanks.
Solution with three <div>'s:
The only tricky bit is the "viewer" div creates the scrolling space to see the background div.
No JS required!
Also remember to specify position when using z-index.
<html>
<style>
#cover, #viewer, #background {
box-sizing: border-box;
position: relative;
padding-top: 50vh;
text-align: center;
height: 100vh;
width: 100%;
}
#cover {
background-color: paleturquoise;
z-index: 1;
}
#viewer {
z-index: -1;
}
#background {
background-color: coral;
position: fixed;
top: 0;
left: 0;
}
</style>
<body>
<div id="cover">
<h1>This Scrolls Up</h1>
</div>
<div id="viewer"></div>
<div id="background">
<h1>This Stays Static</h1>
</div>
</body>
</html>
I'm trying to figure out how Medium made their bottom action / menu bar slide up when your mouse enters the bottom of the document. The slide up effect is not triggered by moving the mouse over the invisible div (it slides up & down via transform translateY).
Besides, the menu bar is only 44px in height, but its is-visible class gets triggered way before your mouse is near it — but by what? When using Inspect Element, I can't see any hidden divs that could be triggering it..
I've searched for countless of ways, e.g. "show element when mouse enters specific part of document" but all search results involve when the mouse enters or moves over a div element, which is not the solution I'm looking for.
Obviously, you can solve this problem by putting the slide up menu inside a hidden container like I've done here, and then you get the desired result:
(function() {
var actionBar = document.querySelector('.action-bar');
var actionBarWrapper = document.querySelector('.action-bar-detection');
function showDiv() {
actionBar.classList.add('js-is-visible')
}
function hideDiv() {
actionBar.classList.remove('js-is-visible')
}
actionBarWrapper.onmouseover = showDiv;
actionBarWrapper.onmouseout = hideDiv;
})();
* {
margin: 0;
padding: 0;
box-sizing: border-box;
line-height: 1.5;
}
body {
height: 100%;
}
.wrapper {
width: 90%;
max-width: 600px;
margin: 5% auto;
}
.action-bar {
position: absolute;
left: 0;
bottom: 0;
border: 1px solid #252321;
background: #fff;
padding: 16px;
width: 100%;
min-height: 50px;
opacity: 0;
transform: translateY(100%);
transition: all .5s;
z-index: 99;
}
.action-bar-detection {
height: 150px;
width: 100%;
opacity: 1;
position: fixed;
bottom: 0;
left: 0;
z-index: 1;
}
.js-is-visible {
opacity: 1;
transform: translateY(0%);
}
<html>
<head>
<meta charset="UTF-8" />
<title>Document</title>
</head>
<body>
<div class="wrapper">
<p>When mouse enters the hidden action bar element, slides up.</p>
<p>But it's only happening because the action-bar is inside an invisible detection layer class (action-bar-detection) with a height of 150px.</p>
</div>
<div class="action-bar-detection">
<div class="action-bar">
Bottom Menu
</div>
</div>
</body>
</html>
However, this doesn't seem to be what Medium have done, and if this can be done without adding more HTML & CSS, I want to learn how! :-)
I think I'm not phrasing the problem correctly, since I can't find any solutions even remotely close (I've searched A LOT).
Any advice? What should I read up on? :-)
Get height of viewport, track onmousemove, and compare clientY from the mouse event to the viewport height:
(function() {
var actionBar = document.querySelector('.action-bar');
var viewHeight = window.innerHeight - 150;
function toggleDiv(e) {
if (e.clientY >= viewHeight) {
actionBar.classList.add('js-is-visible');
} else {
actionBar.classList.remove('js-is-visible');
}
}
window.onmousemove = toggleDiv;
})();
* {
margin: 0;
padding: 0;
box-sizing: border-box;
line-height: 1.5;
}
body {
height: 100%;
}
.wrapper {
width: 90%;
max-width: 600px;
margin: 5% auto;
}
.action-bar {
position: absolute;
left: 0;
bottom: 0;
border: 1px solid #252321;
background: #fff;
padding: 16px;
width: 100%;
min-height: 50px;
opacity: 0;
transform: translateY(100%);
transition: all .5s;
z-index: 99;
}
.action-bar-detection {
height: 150px;
width: 100%;
opacity: 1;
position: fixed;
bottom: 0;
left: 0;
z-index: 1;
}
.js-is-visible {
opacity: 1;
transform: translateY(0%);
}
<div class="wrapper">
<p>When mouse comes within 150px of the bottom part of the screen, the bar slides up.</p>
<p>When the mouse leaves this defined area of the screen, the bar slides down.</p>
</div>
<div class="action-bar-detection">
<div class="action-bar">
Bottom Menu
</div>
</div>
You could do this by listening to the mousemove event on the document, you will want to invest effort into making this performant as it will be triggered frequently. The most common way to regulate events like this is through throttling.
Once you are hooked into the mousemove event you will need to get the Y coordinate of the cursor and compare that to the height of the window, if it is within a threshold then you can reveal your panel, once it moves out you can proceed to hide it again.
Here is an example showing a basic implementation jsFiddle
// Using underscore for the throttle function though you can implement your own if you wish
document.addEventListener('mousemove', _.throttle(mouseMoveEventAction, 200));
function mouseMoveEventAction(e) {
doPanelStuff(isInsideThreshold(e.clientY));
}
function doPanelStuff(isActive) {
var panelElement = document.querySelector('.panel');
if (isActive) {
panelElement.style.background = 'red';
} else {
panelElement.style.removeProperty('background');
}
}
function isInsideThreshold(cursorY) {
var threshold = 200;
var clientHeight = document.documentElement.clientHeight;
return cursorY > (clientHeight - threshold);
}
html, body {
height: 100%;
}
.container, .content {
height: 100%;
width: 100%;
}
.panel {
height: 50px;
position: absolute;
bottom: 0;
width: 100%;
background: green;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.3/underscore-min.js"></script>
<div class="container">
<div class="content"></div>
<div class="panel"></div>
</div>
I have two divs. I want the left div to hide and show automatically according to the window size, i.e. I want it to be responsive.
On the other hand, I want to hide/show the left div manually if necessary. I added a black separator in the middle. When the separator is clicked the left div hides and the right div takes the whole width.
Until now, everything is ok.
BUT. When I hide/show the left div manually, it ceases to react to the responsive code.
Please check this JSFiddle and lend me some help.
Thank you very much.
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<style>
.div1 {
background-color: #ffee99;
width: 300px;
height: 100%;
position: absolute;
top: 0px;
left: 0px;
}
.separator {
border-left: 3px solid #000000;
border-right: 3px solid #000000;
width: 0px;
height: 100%;
position: absolute;
top: 0px;
left: 300px;
z-index: 100;
}
.div2 {
background-color: #99eeff;
width: calc(100% - 300px);
height: 100%;
position: absolute;
top: 0px;
left: 300px;
}
#media screen and (max-width: 500px) {
.div {
display: none;
}
.separator {
left: 0px;
}
.div2 {
width: 100%;
left: 0;
}
}
</style>
<script>
$(function() {
function hideLeftDiv() {
$('.div1').hide();
$('.div2').css('width', '100%').css('left', 0);
$('.separator').css('left', '0px');
}
function showLeftDiv() {
$('.div1').show();
$('.div2').css('width', 'calc(100% - 300px)').css('left', '300px');
$('.separator').css('left', '300px');
}
$('.separator').click(function() {
$('.div1').is(":visible") ? hideLeftDiv() : showLeftDiv();
});
});
</script>
</head>
<body>
<div class="div1"></div>
<div class="separator"></div>
<div class="div2"></div>
</body>
</html>
Have a play with having two classes for identifying whether something is hidden or not i.e. desktop and mobile. You can then check whether its actually hidden with is(':hidden') and respond accordingly.
Check this fiddle for a quick demo http://fiddle.jshell.net/tmx3p6ts/31/
Read this: getbootstrap.com/css/#grid You can use the grid system to make a page like you have, but when the screen is getting to small, you can getbootstrap.com/css/#responsive-utilities use this link to know when to hide things.
So to help you maybe a step in the right direction:
<div class="container">
<div class="col-sm-4 hidden-xs">
This is the left div.
</div>
<div class="col-sm-8 col-sm-12">
This is the left div.
</div>
</div>
Something like this should work. Check out this fiddle: Fiddle with bootstrap
You can adjust the classes to any style you want.
Imagine an HTML page like the following one:
<body>
<div class="main">
<div class="free">aaa</div>
</div>
</body>
The free div is absolutely positioned, and its position is outside the visible area of the browser. Because of that, it will generate an overflow, and scrollbars will be shown. This is ok.
The main div, instead, should be as big as the full area inside the browser. It shouldn't be limited to the visible area.
html, body {
height: 100%
}
.main {
background-color: gray;
width: 100%;
height: 100%;
}
.free {
position: absolute;
width: 100px;
height: 100px;
left: 3000px;
top: 3000px;
}
As you can see here, http://jsfiddle.net/y79NS/12/, the gray div doesn't extend in the "overflow zone". It works if I add a static width/height to html and body elements, but I don't know in advance how much it should be big.
Is there a pure CSS solution? If not, what's the best way to do it with Javascript, keeping in mind that the user could resize the browser in any moment?
You are just missing a semi-colon in your CSS, also use negative margins if you want to hide .free:
html, body {
height: 100%;
}
body {
position: relative;
}
.main {
background-color: gray;
height: 100%;
width: 100%;
}
.free {
position: absolute;
width: 100px;
height: 100px;
left: -3000px;
top: -3000px;
}
http://jsfiddle.net/btipling/y79NS/17/
Im creating a page where my footer is growing on a certain event.
My problem is to make the footer grow according to how much space i got.
See my code or jsFiddle. I want the gray footer to grow all the way up to the colored elements with dynamic height (instead of like now, to 20%).
I guess i could count all the elements height above but that doesn't sound like a good solution.
jsFiddle here
<html>
<head>
<style type="text/css">
body #pagePlaceHolderOuter {
background: #FFFFFF;
height: 100%;
left: 0;
position: absolute;
top: 0;
width: 100%;
}
body #pagePlaceHolderOuter #pagePlaceHolderInner {
height: 100%;
margin: 0 auto;
max-width: 1000px;
min-width: 700px;
width: 70%;
position: relative;
}
body #pagePlaceHolderOuter #pagePlaceHolderInner .div1 {
width: 100%;
height: 100px;
background: blue;
}
body #pagePlaceHolderOuter #pagePlaceHolderInner .div2 {
width: 100%;
height: 120px;
background: green;
}
body #pagePlaceHolderOuter #pagePlaceHolderInner .div3 {
width: 100%;
height: 60px;
background: red;
}
body #pagePlaceHolderOuter #pagePlaceHolderInner .footer {
background: gray;
bottom: 0;
height: 10%;
position: absolute;
width: 100%;
}
</style>
</head>
<body>
<script src="http://code.jquery.com/jquery-latest.min.js" type="text/javascript"></script>
<script>
$("#btn").click(function () {
$('body #pagePlaceHolderOuter #pagePlaceHolderInner .footer').css('height', '20%');
});
</script>
<div id="pagePlaceHolderOuter">
<div id="pagePlaceHolderInner">
<button type="button" id="btn">Click Me!</button>
<div class="div1">I have a dynamic height</div>
<div class="div2">I have a dynamic height</div>
<div class="div3">I have a dynamic height</div>
<div class="footer">Footer</div>
</div>
</div>
</body>
</html>
Instead of calculating the space of all the elements before, you can simply calculate the height of the most previous one and find the offset().top of that element. Using this approach I calculated the space (you have to make sure in your HTML the footer is directly after the previous element or slightly restructure my jQuery) and essentially you just toggle it between the default value and the default value + the space. Updated jsFiddle
$("#btn").click(function (e) {
var prev = $('.footer').prev(),
winHeight = $(window).height(),
calcTop = $('.footer').height() == Math.round(winHeight / 10) ?
(winHeight - prev.offset().top - prev.height()) : "10%";
$('body #pagePlaceHolderOuter #pagePlaceHolderInner .footer').css({
'height': calcTop
});
});
On a side note I used CSS transitions to "animate" the change, not jQuery for performance issues and for ease of editablity
If you just want the position to change, not the height, you can do it by toggling the bottom value instead. Demo of that here