My page has a text form in the middle. The aim is to use css opacity transitions to switch background images by fading. (I'll be switching background images quite often)
Currently got it working nicely by using two layers of background images. To display a new image at the bottom layer, we fade out the top layer (opacity 1 to 0). To display a new image at the top layer, we fade in the top layer (opacity 0 to 1).
The problem is that my text form fades along with the top layer - which I want it to stay visible. How do I make it unaffected by the fading?
Attempts to solve this:
Setting z-index of either #searchForm input or .formDiv to 999999, thinking that this will put the form right at the top of the hierachy so it would be unaffected by transitions below. However, didn't work.
Setting position of #searchForm input or .formDiv to absolute. From http://www.w3schools.com/css/css_positioning.asp,
"Absolutely positioned elements are removed from the normal flow. The document and other elements behave like the absolutely positioned element does not exist."
This stackoverflow post CSS3 Alternating table rows opacity affects text as well as background says that child elements are affected by opacity too. I tried placing the div containing the background images inside the formDiv class so that it wouldn't be a child. But this will get the form covered by the top image, even without opacity on.
function changeBackground(newUrl) {
//check which layer is currently activated
if ($('#background-image-top').hasClass('transparent')) {
//place new image over top layer
$('#background-image-top').css('background-image', 'url(' + newUrl + ')');
//fade in new image
$('#background-image-top').toggleClass('transparent');
} else {
//place new image over bottom layer
$('#background-image-bot').css('background-image', 'url(' + newUrl + ')');
//fade out old image
$('#background-image-top').toggleClass('transparent');
}
}
#background-image-top {
background-image: url("../images/default.jpg");
background-repeat: no-repeat;
background-position: center center;
background-size: cover;
-webkit-background-size:cover;
-moz-background-size:cover;
position: absolute;
top: 0;
right: 0;
bottom: 0;
left: 0;
-webkit-transition: opacity 1s ease-in-out;
-moz-transition: opacity 1s ease-in-out;
-o-transition: opacity 1s ease-in-out;
transition: opacity 1s ease-in-out; }
#background-image-bot {
background-repeat: no-repeat;
background-position: center center;
background-size: cover;
-webkit-background-size:cover;
-moz-background-size:cover;
position: absolute;
top: 0;
right: 0;
bottom: 0;
left: 0;}
.transparent {
opacity: 0.25;}
.formDiv {
background-color: red;
max-width: 500px;
height: 50px;
margin-left: auto;
margin-right: auto;
margin-top: 35%;}
#searchForm input {
width: 300px;
height: 30px;
font-size: 18px;}
I have made a little fiddle where you might can get inspiration, i just use a class to toggle the opacity and them put under the form with position absolute, hope it helps :)
and then use a click function with jQuery to toggle the effect.
the css:
form {
position: relative;
z-index: 10;
}
#background1 {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
background-color: lightblue;
-webkit-transition: all 0.5s ease-in-out;
-moz-transition: all 0.5s ease-in-out;
-ms-transition: all 0.5s ease-in-out;
-o-transition: all 0.5s ease-in-out;
transition: all 0.5s ease-in-out;
}
#background2 {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
background-color: lightgreen;
-webkit-transition: all 0.5s ease-in-out;
-moz-transition: all 0.5s ease-in-out;
-ms-transition: all 0.5s ease-in-out;
-o-transition: all 0.5s ease-in-out;
transition: all 0.5s ease-in-out;
}
.hide {
opacity: 0;
}
http://jsfiddle.net/9jb68w2o/
+++ If you feel better to use css opacity transitions to switch background images by using only one div ie) #background1, you can use this code
$(document).ready(function() {
$('#toggle').click(function(e) {
e.preventDefault();
$('#background1').toggleClass('color1');
});
});
body {
background-color: #f8f8f8;
color: #555;
}.container {
position: relative;
margin: 30px auto;
padding: 20px;
width: 200px;
height: 150px;
background-color: #fff
}
form {
position: relative;
z-index: 10;
}
input[type=text] {
margin: 10px 0;
padding: 5px;
width: calc(100% - 10px);
font-size: 15px;
outline: none;
}
input[type=submit] {
width: 100%;
text-transform: uppercase;
font-size: 15px;
background-color: #333;
color: #fff;
border: none;
cursor: pointer;
}
#background1 {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
background-color: lightblue;
-webkit-transition: all 0.5s ease-in-out;
-moz-transition: all 0.5s ease-in-out;
-ms-transition: all 0.5s ease-in-out;
-o-transition: all 0.5s ease-in-out;
transition: all 0.5s ease-in-out;
}
#background1.color1 {
background-color: lightgreen;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
<div class="container">
<div id="background1"></div>
<form>
<h2>Awesome form!</h2>
<input type="text" placeholder="Some text here" />
<input id="toggle" type="submit" value="Change now!" />
</form>`enter code here`
</div>
Related
Im just curious to know the best practice for either toggling a class or just adding and removing it during a mouseenter/mouseleave state using jquery. Both seem to work fine im just not to sure which is best to go with.
Thank you
$('#image1').mouseenter(function() {
$('#image1').toggleClass('transform');
$('#image1 .images-color-overlay').toggleClass('transparent');
$('#image1 .images-text').toggleClass('show-images-text');
});
$('#image1').mouseleave(function() {
$('#image1').toggleClass('transform show-images-text');
$('#image1 .images-color-overlay').toggleClass('transparent');
$('#image1 .images-text').toggleClass('show-images-text');
});
.images-color-overlay {
position: absolute;
top: 0;
right: 0;
bottom: 0;
left: 0;
background-color: rgba(0, 0, 0, 0.4);
-webkit-transition: all 1s ease;
transition: all 1s ease;
}
.images {
width: 33.333%;
float: left;
overflow: hidden;
position: relative;
}
#image1 {
background-image: url("http://placehold.it/1000x320");
background-size: cover;
background-repeat: no-repeat;
background-position: center;
width: 100%;
height: 100px;
-webkit-transition: all 1s ease;
transition: all 1s ease;
}
.images-text {
text-align: center;
width: 100%;
position: absolute;
bottom: -20px;
color: #fff;
font-size: 10px;
line-height: normal;
-webkit-transition: all 1s;
transition: all 1s;
}
.show-images-text {
-webkit-transition: all 1s;
transition: all 1s;
bottom: 20px;
}
.transform {
-webkit-transform: scale(1.25);
transform: scale(1.25);
-webkit-transition: all 1s ease;
transition: all 1s ease;
}
.transparent {
background-color: rgba(0, 0, 0, 0) !important;
-webkit-transition: all 1s ease;
transition: all 1s ease;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="images">
<div id="image1">
<div class="images-color-overlay">
<p class="images-text">hidden-text</p>
</div>
</div>
</div>
Well a lot of this style question get shot down here on SO, because it seems it comes down to preference. But HERE is a way to do it all without javascript, only CSS, which some might consider more efficient.
.images-color-overlay {
position: absolute;
top: 0;
right: 0;
bottom: 0;
left: 0;
background-color: rgba(0, 0, 0, 0.4);
-webkit-transition: all 1s ease;
transition: all 1s ease;
}
.images {
width: 33.333%;
float: left;
overflow: hidden;
position: relative;
}
#image1 {
background-image: url("http://placehold.it/1000x320");
background-size: cover;
background-repeat: no-repeat;
background-position: center;
width: 100%;
height: 100px;
-webkit-transition: all 1s ease;
transition: all 1s ease;
}
.images-text {
text-align: center;
width: 100%;
position: absolute;
bottom: -20px;
color: #fff;
font-size: 10px;
line-height: normal;
-webkit-transition: all 1s;
transition: all 1s;
}
#image1:hover {
-webkit-transform: scale(1.25);
transform: scale(1.25);
-webkit-transition: all 1s ease;
transition: all 1s ease;
}
#image1:hover .images-text {
-webkit-transition: all 1s;
transition: all 1s;
bottom: 20px;
}
.images-color-overlay:hover {
background-color: rgba(0, 0, 0, 0) !important;
-webkit-transition: all 1s ease;
transition: all 1s ease;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="images">
<div id="image1">
<div class="images-color-overlay">
<p class="images-text">hidden-text</p>
</div>
</div>
</div>
Your code is technically fine, however you can shorten it to just use the hover() method, as the function you provide will be called for both mouseenter and mouseleave events.
You can also use the this reference in the function to save DOM accesses, and also cache the jQuery object created from $(this) in a variable for re-use. Try this:
$('#image1').hover(function() {
var $image = $(this).toggleClass('transform');
$image.find('.images-color-overlay').toggleClass('transparent');
$image.find('.images-text').toggleClass('show-images-text');
});
.images-color-overlay {
position: absolute;
top: 0;
right: 0;
bottom: 0;
left: 0;
background-color: rgba(0, 0, 0, 0.4);
-webkit-transition: all 1s ease;
transition: all 1s ease;
}
.images {
width: 33.333%;
float: left;
overflow: hidden;
position: relative;
}
#image1 {
background-image: url("http://placehold.it/1000x320");
background-size: cover;
background-repeat: no-repeat;
background-position: center;
width: 100%;
height: 100px;
-webkit-transition: all 1s ease;
transition: all 1s ease;
}
.images-text {
text-align: center;
width: 100%;
position: absolute;
bottom: -20px;
color: #fff;
font-size: 10px;
line-height: normal;
-webkit-transition: all 1s;
transition: all 1s;
}
.show-images-text {
-webkit-transition: all 1s;
transition: all 1s;
bottom: 20px;
}
.transform {
-webkit-transform: scale(1.25);
transform: scale(1.25);
-webkit-transition: all 1s ease;
transition: all 1s ease;
}
.transparent {
background-color: rgba(0, 0, 0, 0) !important;
-webkit-transition: all 1s ease;
transition: all 1s ease;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="images">
<div id="image1">
<div class="images-color-overlay">
<p class="images-text">hidden-text</p>
</div>
</div>
</div>
The toggleClass is the bast practice in your case.
Internally it's also doing same thing if the class exist then remove it and if not then add it. See it yourself , goto this github link and search for toggleClass.
// Check each className given, space separated list
if (self.hasClass(className)) {
self.removeClass(className);
} else {
self.addClass(className);
}
I have a left menu that slides in when the user clicks on the hamburger. Behind it is an overlay with the following SCSS:
.overlay {
background-color: $glb-nav-80-opacity-white;
position: fixed;
left: 0;
right: 0;
top: 0;
bottom: 0;
z-index: 200;
cursor: pointer;
}
.left-menu {
background: $glb-nav-dark-blue;
position: fixed;
overflow-x: hidden;
overflow-y: auto;
margin: 0;
padding: 0;
-webkit-transition: all 0.3s ease;
-moz-transition: all 0.3s ease;
transition: all 0.3s ease;
a:hover {
color: $glb-nav-white;
}
}
When people click on the hamburger menu, the overlay shows up abruptly. I need it to fade in. How can I do that using CSS?
Here's the HTML:
<div class="overlay"></div>
<div class="left-menu"></div>
When the user opens the page the left-menu has a left position of -284px. Then when people click on the hamburger icon, I add a class to the div that sets its left position to 0.
Instead of adding a class, you can set the opacity using jQuery's .CSS
For example:
$(".overlay").css({opacity:50});
To reset it, use
$(".overlay").removeAttr("style");
Use CSS transitions as you did for the menu:
.overlay {
background-color: $glb-nav-80-opacity-white;
position: fixed;
left: 0;
right: 0;
top: 0;
bottom: 0;
z-index: 200;
cursor: pointer;
-webkit-transition: all 0.3s ease;
-moz-transition: all 0.3s ease;
transition: all 0.3s ease;
}
Use css transitions as you did with the menu, ie:
.overlay {
// other css
-webkit-transition: opacity 500ms ease;
-moz-transition: opacity 500ms ease;
-o-transition: opacity 500ms ease;
transition: opacity 500ms ease;
}
Or, if using SASS: #include transition(opacity 500ms ease);
Note, you can set the timing and style to be what you like, more here: https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Transitions/Using_CSS_transitions
just add transition to the overlayed div
div {
/* -transition: 2 seconds- */
-webkit-transition: width 2s; /* For Safari 3.1 to 6.0 */
transition: 2s;
}
div:hover {
height: 200px;
background: red;
}
<div>transition on hover</div>
I am trying to achieve the effect shown here:
https://css-tricks.com/almanac/properties/t/transition/
Where the color changes when the user hovers over the element. But I want this to occur overtop a background image I set and for the animation to reverse when the user moves their cursor away from the element.
An example of which can be found here:
http://thefoxwp.com/portfolio-packery-4-columns/
I can get the transition part working with:
.box {
width: 150px;
height: 150px;
background: blue;
<!--background-image: url("http://lorempixel.com/380/222/nature");-->
margin-top: 20px;
margin-left: auto;
margin-right: auto;
-webkit-transition: background-color 2s ease-out;
-moz-transition: background-color 2s ease-out;
-o-transition: background-color 2s ease-out;
transition: background-color 2s ease-out;
}
.box:hover {
background-color: black;
cursor: pointer;
}
<div class="box"></div>
But I am having trouble achieving it with a background image and making the white animation transparent over top of it.
The better way to do it would be to use an overlay over the image and apply transition on its opacity.
See this FIDDLE
Use a wrapper div for both .box and .overlay. Since we want overlay to placed exactly top of the box, we absolute positioned overlay on the top of box.
<div class="wrapper">
<div class="box">
</div>
<div class="overlay">
</div>
</div>
You Css
.wrapper {
position: relative;
width: 150px;
height: 150px;
margin-top: 20px;
margin-left: auto;
margin-right: auto;
}
.box {
position: absolute;
//background: blue;
width: 100%;
height: 100%;
background-image: url("http://lorempixel.com/380/222/nature");
}
.overlay {
position: absolute;
z-index: 1;
opacity: 0;
width: 100%;
height: 100%;
background: white;
-webkit-transition: opacity 2s ease-out;
-moz-transition: opacity 2s ease-out;
-o-transition: opacity 2s ease-out;
transition: opacity 2s ease-out;
}
.overlay:hover {
opacity: 0.7;
}
You can add background-image:none on .box:hover. It will remove the background-image and you can get the background-color work. As soon as, you move out of the div.box, image will appear again.
.box {
width: 150px;
height: 150px;
background-image: url("http://lorempixel.com/380/222/nature");
margin-top: 20px;
margin-left: auto;
margin-right: auto;
-webkit-transition: background-color 2s ease-out;
-moz-transition: background-color 2s ease-out;
-o-transition: background-color 2s ease-out;
transition: background-color 2s ease-out;
}
.box:hover {
background-color: black;
cursor: pointer;
background-image:none;
}
<div class="box"></div>
the problem is that background and background-image cannot both exist at the same time. try using nested div tags: one with the background color nested inside the background-image.
I have transform css applied to a line of text (font-size), but it animates from the left side, I want it to animate from the center. I am using Bootstrap framework so the div is vert/horiz centred.
HTML
<article class="col-md-12">
<div class="lg-indx-img">
<div class="cat-icn">
<?php the_title(); ?>
</div>
</div>
</article>
CSS
article {
position: relative;
margin-bottom: 10px;
width: 100%;
}
.linkage {
position: absolute;
top: 0;
left: 0;
height: 100%;
width: 100%;
}
.lg-indx-img { padding: 20% 0; }
.cat-icn {
position: absolute;
z-index: 9;
left: 50%;
top: 50%;
opacity: 0;
font-size: 15px;
color: #fff;
text-align: center;
transform-origin: 50% 50%;
-webkit-transition: all 0.4s ease;
-moz-transition: all 0.4s ease;
-o-transition: all 0.4s ease;
-ms-transition: all 0.4s ease;
transition: all 0.4s ease;
}
.linkage:hover + .cat-icn {
opacity: 1;
font-size: 25px;
}
when .linkage is hovered the title in .cat-icn increases in size. I don't know the length of the text line since it's generated by Wordpress post.
EDIT - The top picture is what it does now, the bottom picture is what I want it to do
Instead of setting a new font size, you can try using the transform property, which should do the right thing since you have transform-origin already set to the center.
.linkage:hover + .cat-icn {
transform: scale(1.5);
}
Try this out.
http://codepen.io/Chevex/pen/bdRvvJ
.linkage:hover + .cat-icn {
opacity: 1;
transform: scale(3);
}
Instead of animating the font size, animate the transform property instead. Then in your hover rule use the transform property to adjust the scale of the element.
I dont have any idea how to make it work
Css:
.name
{
width: 270px;
height: 77px;
position: absolute;
top: 0px;
left: 600px;
-webkit-transition: top 0.3s;
-moz-transition: top 0.3s;
-o-transition: top 0.3s;
}
.name:hover
{
top: 10px;
-webkit-transition: top 0.3s;
-moz-transition: top 0.3s;
-o-transition: top 0.3s;
font-size: 24px;
}
.photo
{
width: 270px;
height: 310px;
position: absolute;
top: 77px;
left: 600px;
-webkit-transition: top 0.3s;
-moz-transition: top 0.3s;
-o-transition: top 0.3s;
}
.photo:hover,
{
top: 100px;
-webkit-transition: top 0.3s;
-moz-transition: top 0.3s;
-o-transition: top 0.3s;
font-size: 24px;
}
I want when i hold the mouse over the .name which is an image to activate the .photo hover effect and vice versa, any idea?
/* What you want the thing being hovered over to look like */
.name:hover {
top: 10px;
-webkit-transition: top 0.3s;
-moz-transition: top 0.3s;
-o-transition: top 0.3s;
font-size: 24px;
}
/* What you want the thing being hovered over to look like */
.name:hover ~ * {
/* Some styles */
}
In order for this to work, the items that you want to style need to be siblings of the .name element being hovered over. The ~ is a css sibling selector.
I would make a class like
.photo:hover, .photo.hover {
/* CSS */
}
Then toggle class hover on the photo element.
This woul be a javascript solution, not just CSS.
You can try this:
JS
$('.name').hover(function () {
$('.photo').addClass('hover');
}, function () {
$('.photo').removeClass('hover');
});
$('.photo').hover(function () {
$('.name').addClass('hover');
}, function () {
$('.name').removeClass('hover');
});
CSS
.name:hover, .name.hover
.photo:hover, .photo.hover
demo