I'm using an absolutely positioned div to cover/mask another component and it works well except when one of those components is an element using certain display styles, like relative. When that's the case, the element (like an image button) is not masked and can still be interacted with, which is what I'm trying to avoid. This quick example code demonstrates the issue. Is there an easy way to make sure the "mask" div covers everything regardless of how it's positioned? I tried playing with Z-index but it doesn't seem to apply in this scenario.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<head><title>Example</title></head>
<body>
<div style="height:200px; width:400px; background-color:green;">
<div style="position:absolute; top:0px; bottom:0px; left:0px; right:0px; background-color:black; opacity:0.5;"></div>
Test<br />
<input type="image" src="http://www.google.com/intl/en_ALL/images/srpr/logo1w.png" style="position:relative; top:25px;" />
</div>
</body>
</html>
Look this Fiddle
Note:
set position relative to wrapper div
set overlay width, height size
set z-index for elements (where you want to use z-index, you need to define position)
What browser id this an issue in?
I would try using this CSS first and then compare results in IE and FF
div {
position:relative;
z-index:1;
height:200px;
width:400px;
background-color:green;
}
div div {
position:absolute;
z-index:2;
top:0px;
bottom:0px;
left:0px;
right:0px;
background-color:black;
opacity:0.5;
}
div div input {
position:relative;
top:25px;
z-index:1;
}
There's a helpful resource to address this issue.
Long story short, if your absolutely placed div (.abs) is empty, IE doesn't like to place it in front of other elements regardless of z-index. You can use a 1x1 transparent gif to overcome this, eg. by adding the following style to the div:
background: transparent url('/images/clear.gif') repeat 0 0;
I've found this to help. It's great as there's very little additional styling needed and you don't have to explicitly manage z-indices as with other answers here.
Note: You may need to move the absolutely placed div to be the last element in the parent container.
Related
I'm trying to make a div on the screen have a margin n the top, since it's a fixed element, I don't think it can. Also I added a bottom: 0 to it. But I need to space it from the main elements to make my site look better. Anyone have suggestions?
If i understand the question, you just need to use margin-top: #;.
What I usually do is to create a parent of the element. I then apply the fixed properties to the parent. I can then style the main element as much as I like. Eg.
CSS
#parent{
position:fixed;
bottom:0;
left:0;
width:100%;
}
#element{
width:500px;
margin:30px auto;
}
HTML
<div id="parent">
<div id="element">All the content</div
</div>
I'm working on a mobile version of my website, and I'm having trouble vertically-centering two divs. Since it is a mobile site, my css needs to work on any type of screen resolution, so this is where I'm having the problem. Also, different images will be used depending on what page you are on, so the resolution of the image is not static either. I need a way to center both my image div and text div no matter their height or width.
I've made a fiddle here to start out with. As you can see, I chose the green area to be the "screen" for the phone, and I want both the picture to center vertically, and the text to be on top of the picture and center vertically as well. Any help?
What I have so far... (in my jsfiddle)
HTML:
<div id = "screen">
<div class = "overlay" id = "picture"><img src = "http://www.startingtofeelit.com/wp-content/uploads/2013/10/Tennis-Mean-Streets.jpg" /></div>
<div class = "overlay" id = "text">This is where the text would appear</div>
CSS:
#screen {
width:360px;
height:640px;
background-color:#0f0;
position:relative;
overflow:hidden;
display:table-cell;
vertical-align:middle;
}
.overlay {
position:absolute;
top:0;
left:0;
}
#picture {
}
#picture img{
width:100%;
}
#text {
background-color:#000;
width:100%;
opacity:0.5;
color:#fff;
}
For vertically centering you can set margin top/bottom to auto.
If I understand where you want the text, this should work.
Html
<div id = "screen">
<div class = "overlay" id = "text">This is where the text would appear</div>
<div class = "overlay" id = "picture"><img src = "http://www.startingtofeelit.com/wp-content/uploads/2013/10/Tennis-Mean-Streets.jpg" /></div>
</div>
and css
#screen {
width:360px;
height:640px;
background-color:#0f0;
position:relative;
overflow:hidden;
display:table-cell;
vertical-align:middle;
}
#picture {
margin: 0 auto;
}
#picture img{
width:100%;
}
#text {
position: absolute;
top:50%;
background-color:#000;
width:100%;
opacity:0.5;
color:#fff;
}
So it doesn't seem like there is a pure css way to do it, so I ended up using jQuery instead. I made a fiddle in case you want to see how I did it, but the jist of it was this.
On document load, find any item with class "overlay" and apply a negative margin-top of half it's height to center it. Because it already has a position of absolute and top:50%, this will vertically center the item.
$(document).ready(function(){
$(".overlay").each(function(){
$(this).css("margin-top", $(this)[0].scrollHeight/2*-1);
});
});
It's pretty simple, and I wish there was a way to do it in pure css, but this way works as well. Thanks for all the help.
After the discussion in the comments I've determined this question is not nearly thought out well enough to attempt to answer and so this will stay simply in hopes that someone else that finds this page is helped by the answer
:::Initial answer:::
This question is easily much more difficult than you've made it seem. If it's a matter of fitting the image to the viewport of the device there is no single css solution and a javascript solution will be needed.
Let me explain, if the image is much taller than it is wide then to fit the image to the screen you'd want to set the height to something like 90% of the height (give some padding for the text etc). however since the image is variable size if the width is the greater value you'll want the width to something like 90%. Herein lay the problem, you wont want both the height and the width of the image to be 90% as that would distort the image. So there will need to be some javascript to flop around some classes here.
After that the css gets a bit hairy also, if you're looking for an overlay to display the same based on any position the user clicks on an image (assuming this is a sort of gallery) rather than an absolute positioned item at the top and left of the document you'll want a position: fixed; element which is positioned on the viewport.
All described before would need a bit of javascript again because there is no easy way to center something that is fixed without using negative margins of half its width/height.
An example of such a thing is here:
http://jsfiddle.net/5hHMa/2/
Here we have the css for the very fixed case which you have presented.
.overlay {
position:fixed;
top:50%;
left:50%;
margin-top: -150px;
margin-left: -150px;
}
#picture img{
width: 300px;
}
#text {
background-color:#000;
opacity:0.5;
color:#fff;
}
Ideally what you would do is instead of using a fixed value for the margins and width as I have you would determine these values and set them using javascript.
It is hard to form a complete solution for your problem with the limited information given, however hopefully this gives you a push in the correct direction.
I want to create a layout where I want to display an image to the left and content on the right. The image should stay constant when the content scrolls.
The css I'm using:
<style type="text/css">
#page-container
{
margin:auto;
width:900px;
background-color:Black;
}
#header
{
height:150px;
width:650px;
}
#main-image
{
float:left;
width:250px;
height:500px;
background-image:url('../images/main-image.png');
position:fixed;
}
#content
{
margin-left:250px;
padding:10px;
height:250px;
width:630px;
background-color:Teal;
}
</style>
The HTML:
<div id="page-container">
<div id="header"><img src="someimagelink" alt="" /></div>
<div id="main-image"></div>
<div id="content"></div>
</div>
Alot of time on this site and I have understood that background-attachment:fixed positions the image in the entire viewport and not the element it is applied to.
My question is how do I go about creating that kind of layout?
I do not want to give that image as a background image, as if the window is resized, it might get hidden. I want scrollbars to appear if the window size is less than 900px( my page width) so that the image can be viewed at all times.
That happens with this code, however I would like the image to start at my element instead.
How do I go about doing this??
Thanks in Advance :)
Edited:
I took the advice and added a position:fixed property to #main-image. Using the HTML and CSS as shown above.
Now, I also want to fix the header so that it does not move. Basically, only my content section should scroll.
However, if I add a position:fixed to the header, my #main-image and #content now sit on top of my header.
If I add a margin-top:150px (since my header height is 150px) to the #main-image, it works fine and moves down appropriately.
However if I add a margin-top:150px to the #content, my header moves down by 150px and still sits on top of my #content.
Can someone please explain why this is happening?
Thanks in Advance :)
Take a look at this link:
http://www.barelyfitz.com/screencast/html-training/css/positioning/
You can learn how to position Div's with it.
This will solve your problem:
#main-image {position:fixed;}
EDIT:
I'm not sure of what caused your problem but here is the solution:
#content{
position:relative;
top:150px;
}
My Guess:
I think that happened because when using position:fixed those 2 div's were positioned relative to the the browser window, while the other one was relative to the document itself.
In this link you will see more about positioning and you can test some of these features related to the position property:
http://www.w3schools.com/cssref/pr_class_position.asp
About the fact that one div was positioned over another, you should search for the 'z-index' property. Firefox has a 3D mode so you can see this more clearly:
http://www.addictivetips.com/internet-tips/browse-internet-in-3d-using-mozilla-firefox-11-tip/
Set a min-width on html and body.
Have you tried setting your #page-container to relative and your #main-image container to absolute and setting the position using top, bottom, etc. Then you should also be able to float your #content container to the right.
I am using JS to write HTML code where I need to display 2 images exactly overlapped.
The height and width of both are same.
What CSS properties can I use to do this?
Position relative on the container, and absolute on the images:
All of the above answers are missing the fact that you need to position a parent element with something other than static, or else you will be positioning them absolute to the browser window, which I presume you do not wish to do.
position: absolute will give your position in the container of the closest parent with some sort of positioning. So we give the parent position:relative; without declaring top or bottom, this way it will be 0px off from where it would normally be (i.e. no change, but still has position declared).
<div id="container">
<img src="data:image/png;base64,R0lGODlhAQABAPAAAC+byy+byywAAAAAAQABAEAIBAABBAQAOw==" style="height:125px; width:125px;">
<img class="hide" src="data:image/png;base64,R0lGODlhAQABAPAAADCQIzCQIywAAAAAAQABAEAIBAABBAQAOw==" style="height:125px; width:125px;">
</div>
#container{
position:relative;
}
#container img{
position:absolute;
top:0;
left:0;
}
.hide:hover{
opacity:0;
}
http://jsfiddle.net/BLbhJ/1/
Edit: Added your hide functionality
Play around with the css in this:
http://jsfiddle.net/zuZxD/
I used opacity to display the overlapping.
<style>
.imageoverlap{
position: absolute;
top:100px;
}
</style>
...
<div class='imageoverlap'>
image1
</div>
<div class='imageoverlap'>
image2
</div>
Try that :D
If you set position to absolute, you can control where you want to place it.
<style>
#overlay{position:absolute; top:0px;}
</style>
<div id="layer1"><img src="img1.png"></div>
<div id="overlay"><img src="overlay_image.png"></div>
Now you need to position #overlay where you want it, by setting top and left positions, i.e., top:0px, left:300px;
Here is my issue--I need to somehow access the onclick of an item that is covered by another element of higher z-index. I know this is going against the point of z-index, but any ideas?
In the below example, only the small top-sliver of the red box is clickable. I have a webpage design where tabs that need to be clickable are overlaid by an artsy bar... I'd love if there were a way (maybe some javascript trick?) to use onclick for these obscured, lower z-index elements without changing any positioning, though my gut feeling isn't good.
<html>
<head>
<style type="text/css">
#bg {
position:absolute;
width:500px;
height:500px;
background:pink;
}
#under {
cursor:pointer;
margin-top:-10px;
background:red;
width:50px;
height:50px;
z-index:0;
}
#over {
position:absolute;
width:900px;
height:50px;
margin-top:10px;
z-index:100;
}
</style>
</head>
<body>
<div id="bg">
<div id="under" onclick="alert('hi');">aaa</div>
</div>
<div id="over"></div>
</body>
I would do it with a transparent PNG inside a DIV above the artsy bar with the same dimensions as your clickable lowest z-index DIV.
Be aware of Internet Explorer Issues.
I used the technique many times.
The usual replacement method is to place the "over" elements (positioned absolutely) inside the "under" elements (positioned either relatively or absolutely) and make the content the same size (Gilder/Levin Image Replacement).