Is it possible to set the opacity of a background image without affecting the opacity of child elements?
Example
All links in the footer need a custom bullet (background image) and the opacity of the custom bullet should be 50%.
HTML
<div id="footer">
<ul>
<li>Link 1</li>
<li>Link 2</li>
<li>Link 3</li>
<li>Link 4</li>
<li>Link 5</li>
</ul>
</div>
CSS
#footer ul li {
background: url(/images/arrow.png) no-repeat 0 50%;
}
What I've Tried
I tried setting the opacity of the list items to 50%, but then the opacity of the link text is also 50% - and there doesn't seem to be a way to reset the opacity of child elements:
#footer ul li {
background: url(/images/arrow.png) no-repeat 0 50%;
/* will also set the opacity of the link text */
opacity: 0.5;
}
I also tried using rgba, but that doesn't have any effect on the background image:
#footer ul li {
/* rgba doesn't apply to the background image */
background: rgba(255, 255, 255, 0.5) url(/images/arrow.png) no-repeat 0 50%;
}
You can use CSS linear-gradient() with rgba().
div {
width: 300px;
height: 200px;
background: linear-gradient(rgba(255,255,255,.5), rgba(255,255,255,.5)), url("https://i.imgur.com/xnh5x47.jpg");
}
span {
background: black;
color: white;
}
<div><span>Hello world.</span></div>
Take your image into an image editor, turn down the opacity, save it as a .png and use that instead.
This will work with every browser
div {
-khtml-opacity:.50;
-moz-opacity:.50;
-ms-filter:"alpha(opacity=50)";
filter:alpha(opacity=50);
filter: progid:DXImageTransform.Microsoft.Alpha(opacity=0.5);
opacity:.50;
}
If you don't want transparency to affect the entire container and its children, check this workaround. You must have an absolutely positioned child with a relatively positioned parent.
Check demo at http://www.impressivewebs.com/css-opacity-that-doesnt-affect-child-elements/
If you are using the image as a bullet, you might consider the :before pseudo element.
#footer ul li {
}
#footer ul li:before {
content: url(/images/arrow.png);
filter:alpha(opacity=50);
filter: progid:DXImageTransform.Microsoft.Alpha(opacity=0.5);
opacity:.50;
}
You can put the image in the div:after or div:before and set the opacity on that "virtual div"
div:after {
background: url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/3/owl1.jpg);
opacity: 0.25;
}
found here
http://css-tricks.com/snippets/css/transparent-background-images/
#footer ul li {
position: relative;
opacity: 0.99;
}
#footer ul li::before {
content: "";
position: absolute;
width: 100%;
height: 100%;
z-index: -1;
background: url(/images/arrow.png) no-repeat 0 50%;
opacity: 0.5;
}
Hack with opacity .99 (less than 1) creates z-index context so you can not worry about global z-index values. (Try to remove it and see what happens in the next demo where parent wrapper has positive z-index.)
If your element already has z-index, then you don't need this hack.
Demo of this technique.
Unfortunately, at the time of writing this answer, there is no direct way to do this. You need to:
use a semi-transparent image for background (much easier).
add an extra element (like div) next to children which you want the opaque, add background to it and after making it semi-transparent, position it behind mentioned children.
Another option is CSS Tricks approach of inserting a pseudo element the exact size of the original element right behind it to fake the opaque background effect that we're looking for. Sometimes you will need to set a height for the pseudo element.
div {
width: 200px;
height: 200px;
display: block;
position: relative;
}
div::after {
content: "";
background: url(image.jpg);
opacity: 0.5;
top: 0;
left: 0;
bottom: 0;
right: 0;
position: absolute;
z-index: -1;
}
The "filter" property, needs an integer for percentage of opacity instead of double, in order to work for IE7/8.
filter: progid:DXImageTransform.Microsoft.Alpha(opacity=50);
P.S.: I post this as an answer, since SO, needs at least 6 changed characters for an edit.
To really fine-tune things, I recommend placing the appropriate selections in browser-targeting wrappers. This was the only thing that worked for me when I could not get IE7 and IE8 to "play nicely with others" (as I am currently working for a software company who continues to support them).
/* color or background image for all browsers, of course */
#myBackground {
background-color:#666;
}
/* target chrome & safari without disrupting IE7-8 */
#media screen and (-webkit-min-device-pixel-ratio:0) {
#myBackground {
-khtml-opacity:.50;
opacity:.50;
}
}
/* target firefox without disrupting IE */
#-moz-document url-prefix() {
#myBackground {
-moz-opacity:.50;
opacity:0.5;
}
}
/* and IE last so it doesn't blow up */
#myBackground {
opacity:.50;
filter:alpha(opacity=50);
filter: progid:DXImageTransform.Microsoft.Alpha(opacity=0.5);
}
I may have redundancies in the above code -- if anyone wishes to clean it up further, feel free!
we can figure out that by not playing with opacity just by using rgba color
e.g "background-color: rgba(0,0,0, 0.5)"
Sample :
Previous Css:
.login-card {
// .... others CSS
background-color: #121e1b;
opacity: 0.5;
}
To :
.login-card {
// .... others CSS
background-color: rgba(0, 0, 0, 0.5);
}
If you have to set the opacity only to the bullet, why don't you set the alpha channel directly into the image? By the way I don't think there is a way to set the opacity to a background image via css without changing the opacity of the whole element (and its children too).
Just to add to the above..you can use the alpha channel with the new color attributes eg. rgba(0,0,0,0) ok so this is black but with zero opacity so as a parent it will not affect the child. This only works on Chrome, FF, Safari and....I thin O.
convert your hex colours to RGBA
I found a pretty good and simple tutorial about this issue. I think it works great (and though it supports IE, I just tell my clients to use other browsers):
CSS background transparency without affecting child elements, through RGBa and filters
From there you can add gradient support, etc.
#footer ul li
{
position:relative;
list-style:none;
}
#footer ul li:before
{
background-image: url(imagesFolder/bg_demo.png);
background-repeat:no-repeat;
content: "";
top: 5px;
left: -10px;
bottom: 0;
right: 0;
position: absolute;
z-index: -1;
opacity: 0.5;
}
You can try this code. I think it will be worked. You can visit the demo
I am trying to add background color to the overall image slider located at http://192.241.239.235 so that it looks like
.
I have tried adding the style attribute
background-color: rgba(0,0,0,0.6);
overflow: auto;
to the
<div id='content'>
but the background color just does not show.
You already have an overlay on your slides that you can change here: .tp-banner ul li:after. And I see that you need to give it a higher ´z-index´ to make it appear above the video in the slideshow.
/* The fullscreen video */
.tp-caption.fullscreenvideo {
z-index: 0;
}
/* The covering black */
.tp-banner ul li:after {
background: rgba(0,0,0,.6);
z-index: 1;
}
/* All slideshow content */
.tp-caption {
z-index: 2;
}
I am trying to have text appear over each image as the user hovers over that specific image. I don't want all of the text for every image to appear when a user hovers over one image. I have it where only the one photo becomes opaque but right now the text shows up for every image when hovering over any image.
HTML:
<div class="image">
<img class="projectImage" src="images/peralta.png" alt="">
<h3 class="hiddenH3">This is a test!</h3>
</div>
SCSS:
.image {
position: relative;
width: 100%;
.projectImage {
width: 100%;
transition: all 0.5s ease-in;
}
.hiddenH3 {
display: none;
position: absolute;
top: 45%;
width: 100%;
}
}
JS:
$('.projectImage').on("mouseover", function() {
$(this).closest('.projectImage').addClass("coolEffect");
$('.hiddenH3').fadeIn(1000);
});
$('.projectImage').on("mouseout", function() {
$(this).closest('.projectImage').removeClass("coolEffect");
$('.hiddenH3').fadeOut(1000);
});
Use .next along with this
$('.projectImage').on("mouseover", function() {
$(this).addClass("coolEffect");
$(this).next(".hiddenH3").fadeIn(1000);
});
$('.projectImage').on("mouseout", function() {
$(this).removeClass("coolEffect");
$(this).next(".hiddenH3").fadeOut(1000);
});
You can also remove .closest(".projectImage") as this refers to that image.
Why don't you do this with CSS? Since the selectors needed are very old and entrenched, you can do something like this:
.projectImage + h3 {
transition: opacity 1000ms;
opacity: 0;
}
.projectImage:hover + h3 {
opacity: 1;
}
This will fade in your h3 when you hover over the project image, as long as you structure it in that way (i.e., ing, then h3). You can also remove the classes cooLEffect and hiddenh3 as we have defined that by only targeting the h3 that comes after a project image.
The fancy transition effect will only work on modern browser, but older browsers gracefully degrade.
Edit: SASS / LESS
.image {
.projectImage {
& + h3 {
transition: opacity 1000ms;
opacity: 0;
}
&:hover + h3 {
opacity: 1;
}
}
}
I'd like to change the css "background-image:" when someone clicks a button.
I'm not sure if I'm able to change it through css or if I would need to incorporate java script. Also, if I need java script what type of code would I need?
My current work around is with css and it looks like:
.hello-button {
background-image: url("hello.png");
background-repeat: no-repeat;
background-attachment: inherit;
background-position: center;
-webkit-transition: 2s ease-out;
-moz-transition: 2s ease-out;
-o-transition: 2s ease-out;
transition: 2s ease-out;
}
.hello-button:hover {
background-image: url("bye.png");
background-repeat: no-repeat;
background-attachment: inherit;
background-position: center;
transition-delay: .7s;
-webkit-transition-delay: .7s;
-moz-transition-delay: .7s;
-o-transition-delay: .7s;
}
I'd approach it like this. http://jsfiddle.net/darcher/6Ex7h/
jquery
$('.img').on({
click: function(){
$(this).addClass('new-bg').removeClass('bg') // changes background on click
},
mousedown: function() {
// :active state
},
mouseup: function() {
// on click release
},
mouseenter: function() {
// on hover
},
mouseleave: function() {
// hover exit
}
/*
, hover: function(){
// or hover instead of enter/leave
}
*/
})
With these varying states, you can do anything you need. There are also a variety of other states you can use http://api.jquery.com/category/events/mouse-events/
html
<div href="#" class="img bg"></div>
css
.img{
background-repeat:no-repeat;
background-size:cover;
background-position:center;
display:block;
height:200px;
}
.bg{
background-image:url(http://placehold.it/300x200/white/black);
}
.new-bg{
background-image:url(http://placehold.it/300x200/black/white);
}
there are css only alternatives, but they're not really great on support: http://tympanus.net/codrops/2012/12/17/css-click-events/
You could use javascript for change the background. The following website javascripter is an example of changing background color and manipulating CSS by Javascript. I hope this can help you.
1. CSS pseudo-class selector:active
If you didn't care about persistence you could always use the the pseudo-class ":active". The image will only be affected as long as your mouse is down. As soon as you mouse-up it'll revert. At this moment, that's about as close as you can get in CSS.
.hello-button:active {
background-image: url("image.jpg");
}
JSFiddle Example: http://jsfiddle.net/pkrWV/
2. Change Style Attribute with JavaScript
JavaScript is just about the only way you're going to be able to click on an object, mouse-up and the background is still changed. JavaScript gives you a couple ways to do it too.
You can use JavaScript to change the object's style attribute to update the 'background-image'.
obj.style.backgroundImage = 'url("image.jpg")';
JSFiddle: http://jsfiddle.net/pkrWV/1/
3. Change Class Attribute with JavaScript
Or similarly, you could create two classes in your CSS, and use JavaScript to update the object's class attribute.
/* JavaScript */
obj.className = 'imageOneClassName';
/* CSS */
.imageOneClassName {
background-image: url("image.jpg");
}
JSFiddle: http://jsfiddle.net/pkrWV/2/
My personal favorite method is the third option where you still use CSS to style your obj in different states, and then you use JavaScript to change the class name to update those states. It's less JavaScript, more CSS, and you're keeping everything in their appropriate places.
$(function() {
$('.home').click(function() {
$(this).css('background-image', 'url(images/hello.png)');
});
}):
you have to do like this, there was a relative question see this i hope i helped you...
jquery onclick change css background image
There's no way to do this in pure HTML/CSS, but in javascript you can do it like so:
var button = document.getElementsByClassName("hello-button")[0];
button.addEventListener("click", function(){
button.style.backgroundImage = "url(bye.png)";
});
You can either include this in a <script></script> tag or add it to a .js file and include that by adding <script src="scriptName.js"></script>
Here's a CSS-only solution: http://jsfiddle.net/VVj6w/
HTML
<input type = "checkbox" id = "backgroundToggle" />
<label for = "backgroundToggle">Switch Background</label>
<div id = "wrapper"></div>
CSS
* {
padding: 0;
margin: 0;
border: 0;
}
html, body {
height: 100%;
-webkit-user-select: none;
-moz-user-select: none;
-o-user-select: none;
user-select: none;
}
input[type = "checkbox"] {
display: none;
}
label {
position: absolute;
top: 10px;
left: 10px;
background-color: #eee;
border: 2px solid #ccc;
padding: 5px;
border-radius: 10px;
font-family: Arial, Sans-Serif;
cursor: pointer;
}
#wrapper {
background-color: hsla(0, 100%, 50%, 1);
height: 100%;
width: 100%;
}
input[type = "checkbox"]:checked ~ #wrapper {
background-color: hsla(0, 100%, 50%, 0.1);
}
If you only want it to change while you are clicking, you should be able to use
.hello-button:active {
background-image: url("bye.png");
...
}
If you want it to remain that way after the click (after the mouse button has been released), you will have to use javascript. Something like the following
document.getElementsByClassName("hello-button")[0].addEventListener("click", function(el) {
el.classList.add("clicked");
});
Then in the CSS, update your selector to
.hello-button.clicked
I wrote code in the javascript (show/hide div). Now i wanna use attribute "transition" in CSS, but it doesn't work.
JavaScript in HEAD:
function show()
{
document.getElementById('add-contact').style.display=\"block\";
document.getElementById('add-contact-button').style.display=\"none\";
}
</script>
Div add-contact and add-contact-button:
<span id=\"add-contact-button\" href=\"/kontakty#\" onclick=\"javascript:show()\">Dodaj kontakt</span>
<form action=\"kontakty/dodaj\" method=\"post\" id=\"add-contact\" >
...
</form>
Part CSS:
form#add-contact {
float: right;
width: 223px;
height: auto;
line-height: 27px;
display: none;
transition: height 500ms linear;
}
I see two major problems:
You can't transition the display property. You have to have it as a block from start, and just hide it with opacity: 0
You need to use the -webkit vendor prefix to make it work in Chrome and Safari.
See a working demo here: http://codepen.io/anon/pen/hwayD