i am totally new in web design, and i am right now struggling with creating part of my website, i need to somehow make this happen:
When PART of the BODY BACKGROUND is HOVERED, make the background change to "B", and when the mouse is not over that part, I need it to change back to background "A".
I have seen some examples here but as i am a beginner, i have no idea how to use javascript, if you could please give me some light here, either on pure CSS or on how to apply javascript.
This is accomplished very easily using a third party javascript library called JQuery http://jquery.com, you can see a working example here: http://jsfiddle.net/bbp8G/
$(document).ready(function(){
$("#hover").mouseenter(function(){
$(this).css("background","#009900");
}).mouseleave(function(){
$(this).css("background","#ffffff");
});
});
Here's the easiest way I know how to do what you've described...
<!-- POSITION THIS DIV WHEREVER YOU WANT THE
USER TO HOVER SO THAT THE BACKGROUND WILL CHANGE -->
<div id="hover">
</div>
<!-- PUT THIS CODE IN YOUR <HEAD> -->
<script type="text/javascript" src="//ajax.googleapis.com/ajax/libs/jquery/1.10.1/jquery.min.js" />
<style>
#hover { width: 200px; height: 200px; position: relative; top: 200px; background: green; }
.myNewBackround { background-color: red; }
</style>
<script>
$(document).ready(function() {
// when the #hover DIV is hovered, change the background of the body
$('#hover').hover(function() {
$('body').addClass('myNewBackground');
});
});
</script>
Here's a JS FIDDLE:
http://jsfiddle.net/ZKaJn/
Or you can do it with pure CSS
<div id="left"> </div>
<div id="right"> </div>
And the CSS part:
#left
{
background-color:#000;
float:left;
width:50%;
height:200px;
}
#right
{
background-color:#FF0;
float:right;
width:50%;
height:200px;
}
#right:hover
{
background-color:#00F;
}
#left:hover
{
background-color:#F00;
}
You can replace the div's and values with whatever you like, the main part is the #right:hover and #left:hover
Actually with just css it is not possible to change the background of the body when hovering a DOM element. This is because CSS does not allow you (yet) to travel up the DOM tree (select a parent), only down (select a child).
That being said, it is however possible to mimic the effect, and it is even quiet easy if it is the body background you want to change. You can lay a pseudo element with a background on top of your body background, and underneath the actual content. This way it looks as if the body background has changed.
The css to achieve this would look something like this:
.hover-me:hover:after {
content: '';
top: 0;
left: 0;
right: 0;
bottom: 0;
position: fixed;
background: url(http://placekitten.com/600/300) center center;
background-size: cover;
z-index: -1;
}
And a small fiddle to demonstrate: http://jsfiddle.net/3dwzt/
Should be compatible with IE8 and up
Related
I did some research on here, and I left with the impression that a background image is not loaded if the associated div class is not in the HTML. This led me to believe that when using addClass() to assign a div the class with the background image, I would need to refresh the CSS to make the image load. However, it is showing up without refreshing the CSS.
Does including the class in the JavaScript cause the CSS to pre-load the image, so it is ready when the class is added? If not, why is the background image available without refreshing the CSS?
HTML
<body>
<div class="no-class"></div>
</body>
CSS
.background-image {
background-image: url('image.png');
background-size: 100% 100%;
}
.no-class {
height: 500px;
width:500px;
background-color: red;
}
JS
$(document).ready(function () {
$('.no-class').click(function() {
$('.no-class').toggleClass('background-image');
});
})
rearrange classes
.no-class {
height: 500px;
width:500px;
background-color: red;
}
.background-image {
background-image: url('image.png');
background-size: 100% 100%;
}
And be sure to include Jquery
DEMO
and if you have more than 1 element with class .no-class .. use $(this)
$(document).ready(function () {
$('.no-class').click(function() {
$(this).toggleClass('background-image');
});
})
Is it possible to make the overflow not hidden but just change the opacity of the content that is overflowing?
So that the parts of the content that are going outside the parent div has opacity of .5 but the parts that remain in the parent are normal?
This would require JavaScript I am assuming if anyone could get me off in the right direction I would be very appreciative. In my fiddle you can drag the image around.
FIDDLE
<script type='text/javascript' src='http://code.jquery.com/jquery-1.5.js'></script>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.7/jquery-ui.js"></script>
<script type='text/javascript'>//<![CDATA[
$(window).load(function(){
$('#img_rnd').resizable();
$('#rnd').draggable({
appendTo: 'body',
start: function(event, ui) {
isDraggingMedia = true;
},
stop: function(event, ui) {
isDraggingMedia = false;
}
});
});//]]>
</script>
<link rel="stylesheet" type="text/css" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.6/themes/cupertino/jquery-ui.css" />
<div id="frame">
<div id="rnd" style="display:inline-block">
<img id="img_rnd" style="border:1px solid red" src="http://blog.stackoverflow.com/audio/stackoverflow-300.png" />
</div>
</div>
<style>
#frame {
height: 500px;
width: 500px;
overflow: hidden;
border: 1px solid black;
}
</style>
Allow me to think outside the box here. Why, in stead of applying an opacity, don't you overlay your picture with something semi transparent... Something like this:
#frame:after {
content: '';
display: block;
position: absolute;
background: transparent;
z-index: 1;
pointer-events: none;
top: -1px;
bottom: -1px;
left: -1px;
right: -1px;
box-shadow: 0 0 0 5000px rgba(255,255,255,.5);
}
It may be a bit hacky, but it works, and with just css. Have a look at the updated fiddle
Oooh. A cool, but tricky idea.
As far as I know, there's no easy way to do this without javascript.
My recommendation is to include 2 images:
The overflow: hidden; image. This will work exactly as you have in your demo.
The opacity: 0.5 image. This is the image that will show up outside of the parent. In fact, in order to show up outside of the parent, it must be just that: a sibling of the parent.
With this you can have the inner area of the parent show the overflow: hidden;, and the outer area of the parent show the opacity: 0.5.
If you take this approach, I'd recommend keeping all of the event handlers on the slightly opaque one, as that will always be on top, even when the image is entirely outside of the frame!
Here's the fiddle.
you can achieve a similar effect by having an absolute div, with same image, with less opacity and less z-index, and it would move around with your image as you move it, using start stop and drag functions.
see this fiddle for a example, there might be some lag sometimes, but consider this as a proof of concept.
http://jsfiddle.net/gaurav5430/vrUgs/1244/
accurate:
http://jsfiddle.net/gaurav5430/vrUgs/1246/
I have several underlaying divs with hover effect. Sometimes I need to show modal dialog and all undelaying divs should be "disabled". This is done by placing semi-transparent high z-index div on top of them, but the problem is that hover effect on underlaying div stays until I move my mouse. Is there a way to "unhover" underlaying divs when overlaying semi-transparent div becomes visible?
Simplified exanple
HTML:
<div class="somediv"></div>
<div id="modal"></div>
CSS:
#modal {
z-index: 1000;
background:#000;
position:fixed;
top:0; left:0;
width:100%;
height:100%;
display: none;
opacity: 0.3;
}
.somediv {
position: absolute;
left: 20px;
top: 20px;
width: 100px;
height: 100px;
background-color: red;
}
.somediv:hover {
background-color: blue;
}
JS:
setTimeout(function(){
$("#modal").show();
}, 5000);
Hover over square and wait 5 seconds.
It should work: http://jsfiddle.net/rjLhj/
When you open a modal (in JS), just add a class to your .somediv ('.no-hover', for example). In CSS, change your .somediv:hover to .somediv:not(.no-hover):hover.
I don't know about compatibility... So, you should test :P
JS:
setTimeout(function(){
$("#modal").show();
$('.somediv').addClass('no-hover')
}, 2000);
CSS:
.somediv:not(.no-hover):hover {
background-color: blue;
}
Update:
http://caniuse.com/#feat=css-sel3
It works on IE9+, FF3.5+ and Safari3.1+... But you can use Attribute Selectors for reach the same result.
HTML:
<div class="somediv" data-nohover="0"></div>
<div id="modal"></div>
CSS:
.somediv[data-nohover="0"]:hover {
background-color: blue;
}
JS:
setTimeout(function(){
$("#modal").show();
$('.somediv').attr('data-nohover','1')
}, 2000);
Or better, add one class to your somediv ('hashover', for example), remove it on modal open and define your css like this:
.somediv.hashover:hover {...}
Unfortunately the browser wont pick up mouse events until the mouse is moved...
The best way to deal with this is to create a new class that overrides the hover behaviour and apply this at the same time as you show the modal.
Ok, so i want to have a series of divs which are the exact width and height of the user's browser window, regardless of the screen size. I can easily make the divs stretch horizontally with "width: 100%;" but i cant work out how to make the height stretch itself. I am guessing that i need to use some bit of javascript to judge the height, and then another piece to resize the seperate divs. Unfortunately I am a complete javascript n00b and after two hours of seemingly fruitless searching and coming up with about 100 "solutions" this was as far as id gotten (Im sure that at some point I have probably been closer to the answer):
var viewportHeight = "height:" + document.documentElement.clientHeight;
getElementById('section-1').setAttribute('style', viewportHeight);
<div class="section" id="section-1"></div>
<div class="section" id="section-2"></div>
<div class="section" id="section-3"></div>
edit:
ah i should be more clear, im attempting to have all three divs take up the entire screen, so you have to scroll down to see each one - almost like seperate slides. The idea is that each one takes up the entire screen so you cant see the next section until you scroll down, rather than having three divs which take up a third of the screen.
If you haven't already tried it, you'll want to look at parent:child inheritance of elements within the DOM by way of using CSS.
What I want to STRESS is that everyone giving you JS hacks to accomplish this is not only providing you with overkill (YOU did ask for a JavaScript solution, so they gave it to you!), but it's also a deviation from standards. HTML is for structure, CSS is for presentation, and JavaScript is for behavioral aspects... setting a div to the width of the viewport on load is a PRESENTATION aspect and should be done in CSS... not JavaScript. If you were trying to change the width based on events or user interaction, then yes JavaScript is your friend... but stick with just HTML and CSS for now.
The trick is that most elements have an undefined height - and height is later defined by the content that the element holds.
If you want to 'trick' an element into having a height other than what it wants to default to, you'll have to explicitly define it. Since you want to inherit your height from the viewport, you'll have to define the height at the top and bring it down...
You might be in luck and can avoid JavaScript altogether (unnecessary). Just use CSS.
Try something like:
html, body {
height: 100%;
width: 100%;
}
Now, when you try to set your div's later on, specify width: 100% and the height gets inherited from the html --> body --> div.
Try that and see if that solves your problem - if not, point us to a website, a pastebin, or a SOMETHING with code in it that we can just show you how to do it (whereas what you posted for code was an attempt in JavaScript which is only 1 part of the code - post the full thing either to a server or temp site like pastebin).
Here is some sample code I wrote (tested in Chromium):
The HTML:
<html>
<head>
<title>Test Divs at 100%</title>
<link rel="stylesheet" type="text/css" href="divtest.css"
</head>
<body>
<div class="test1">aef</div>
<div class="test2">aef</div>
<div class="test3">aef</div>
</body>
</html>
The CSS:
html, body {
width: 100%;
height: 100%;
background-color: #793434;
padding: 0;
margin: 0;
}
div {
height: 100%;
width: 100%;
}
.test1 {
background-color: #E3C42E;
}
.test2 {
background-color: #B42626;
}
.test3 {
background-color: #19D443
}
try this
div#welcome {
height: 100vh;
background: black;
color: white;
}
div#projects {
height: 100vh;
background: yellow;
}
<div id="welcome">
your content on screen 1
</div>
<div id="projects">
your content on screen 2
</div>
it should work for you, but little support in IE
A bit of jQuery should do it:
$(document).ready(function() {
var window_height = $(window).height();
$('#section-1").height(window_height);
});
And if you want to keep 100% height on window resize:
$(document).ready(function() {
function viewport_height() {
var window_height = $(window).height();
$('#section-1").height(window_height);
}
viewport_height();
$(window).resize(function() {
viewport_height();
});
});
try this
window.onload = init;
function init()
{
var viewportHeight = "height:" + document.documentElement.clientHeight+"px;";
document.getElementById('section-1').setAttribute('style', viewportHeight);
}
Here is a script free solution, just CSS. This assumes that the divs are directly in the body element or a parent with position absolute and the parent has no padding.
#section-1 {
position: absolute;
height: 100%;
width: 100%;
background: #ff0000;
}
#section-2 {
position: absolute;
width: 100%;
top: 100%;
height: 100%;
background: #00ff00;
}
#section-3 {
position: absolute;
width: 100%;
top: 200%;
height: 100%;
background: #0000ff;
}
See fiddle: http://jsfiddle.net/QtvU5/1/
The website i am currently working on has a pop out div with a map of locations on it, my problem is once the pop up div has been closed i then have to refresh the page to open the div again
It is running jquery - here is the code
<script src="http://code.jquery.com/jquery-1.9.1.min.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$('#view_map_of_stocklists_link').click(function() {
//$('#popupdiv').show('slow');
$("#popupdiv").css('visibility', 'visible');
$("#mappy").css('opacity', '1');
});
$('.closepopup').click(function() {
$('#popupdiv').hide('slow');
});
});
</script>
The styling
<style>
#popupdiv
{
position: absolute;
left: 50%;
top: 50%;
background-color: white;
z-index: 100;
height: 600px;
margin-top: -200px;
width: 960px;
margin-left: -500px;
padding: 20px;
}
#view_map_of_stocklists_link:hover {
cursor:pointer;
}
.closepopup {
margin-top: 60px;
border: 1px solid #ccc;
background-color: #000;
color: white;
cursor: pointer;
}
</style>
and then the HTML itself
<div id="popupdiv" style="visibility:hidden;">
<center>
<iframe style="opacity:0;" id="mappy" src="http://mapsengine.google.com/map/embed?mid=zNedxWZ7lai0.krRxVqZZmyns" width="900" height="500"></iframe>
<div class="closepopup" style="width:200px">Close</div>
</center>
</div>
<h2 class="bold skin-font-color1">Our Beloved Stockists</h2>
<h5 class="skin-font-color1 p-wrapper"><!-- client txt --> <div id="view_map_of_stocklists_link" class="skin-font-color4">
<h4>View map of stockists</h4>
</div>
The website is http://www.tee-ze.co.uk/sosmoothies/
Cheers
You are setting 'visibility' to 'visible' instead of 'display' to 'block'.
When jQuery .hide() is called it ultimately saves the previous display value and sets it to display:none; So you should be doing something like:
$('#view_map_of_stocklists_link').click(function() {
$('#popupdiv').hide('slow');
});
Which I just realized you have commented out in your code. I wish I could leave a comment but I need more rep.
Edit:
Sorry for complaining in may previous answer.
I just tried uncommenting the existing code and removing the visibilty stuff and that works just fine in your site. Try it.
The way you're showing the popup map doesn't match the way you're hiding it.
You show it with:
$("#popupdiv").css('visibility', 'visible');
But you hide it with:
$('#popupdiv').hide('slow');
That fades it out but ultimately sets the CSS style display: none on the #popupdiv element.
When you try to show it again, it still has display: none on it. Setting the visibility doesn't affect the display style.
You need to make the hide and show match up. Either use the visibility style, or the display style, but use the same one for both hiding and showing (and jQuery's .show() method uses display).
For example, you might create the <div> with display: none instead of visibility: hidden, and then you can use jQuery's .show() and .hide() consistently.