Change transition-duration with add/removeClass - javascript

I'm trying to make a simple pen with a button. When "on" is pressed the cover should slide and cover "on". When "off" is pressed the cover should cover "off". It works the way I have it, but when I try to add some transition effects nothing works. I tried adding transition-duration: 1s; to every class in the project but no luck.
Here's my codepen.
https://codepen.io/Alex-Iron/pen/eMORVV
My code is this:
HTML
<div id="switch" class="silver-background">
<div id="wrapper">
<div class="silver-background" id="cover">
<div id="cover-inner"></div>
</div>
<div id="on" class="on-left">on</div>
<div id="off">off</div>
</div>
</div>
SCSS
$radius: 7px;
$height: 100px;
$width: $height*1.5;
#switch{
width: $width*2.1;
height: $height*1.2;
display: grid;
position: relative;
}
.silver-background{
border-radius: $radius;
background: silver;
}
#wrapper{
margin: auto;
display: flex;
}
#on, #off, #cover, #cover-inner{
font-size: $height/3;
height: $height;
width: $width;
line-height: $height;
text-align: center;
text-transform: uppercase;
font-family: sans-serif;
}
#on{
background: radial-gradient(green, green, black);
border-radius: $radius 0 0 $radius;
color: lightgreen;
}
#off{
background: radial-gradient(#A00000, #A00000, black);
border-radius: 0 $radius $radius 0;
color: #EC6666*1.3;
}
#cover{
position: absolute;
border: 1px solid black;
width: $width*2.1/2;
height: $height*1.2;
display: grid;
top: 0;
}
#cover-inner{
width: $width*0.9;
background-color: white;
border-radius: $radius;
margin: auto;
}
.on-left{
left: 0;
}
.on-right{
right: 0;
}
My jQuery code.
$("#off").on('click',()=>{
$('#cover').removeClass('on-left');
$('#cover').addClass('on-right');
});
$('#on').on('click',()=>{
$('#cover').removeClass('on-right');
$('#cover').addClass('on-left');
})

I've updated your pen:
https://codepen.io/anon/pen/geOpgz
You should use the transition property of css:
#cover{
...
left: 0;
transition: 1s left;
}
The transition property can be used to animate a property value change. It is important, that your class only changes a property value f.e. left and not switches from left: 0 to right: 0:
#cover.on-left{
left: 0;
}
#cover.on-right{
left: $width;
}
In your case, the new value of your left property on right position is left: $width*2.1 / 2 cause your wrapper has the following width: width: $width*2.1.
By the way, i yould suggest you to use the toggleClass function of jquery:
$("#wrapper").on('click',()=>{
$('#cover').toggleClass('on-right');
});
Now you can click your wrapper on any position and it toggles the "on" and "off" with only one class .on-right and less javascript code:
https://codepen.io/anon/pen/QmWjwb

Your id="cover" should have on-left from start, and then give that #cover property transition: left 0.2s ease and class .on-right should have left: 150px since you cant transition from left: 0 to right: 0.
Here is the updated pen: https://codepen.io/zmuci/pen/JLjdEb

Related

How can i get 2 classes by id inside the same function

I need to target two div elements and toggle their classes simultanouesly.
I understand that I can get multiple divs "by ID" by using .querySelectorAll
but when I get to .classlist.toggle ("NewClassName"); how can I target two classes??
So here's some code:
#small-div{
background-color:#aaaaaa;
border: 3px solid #aaaaaa;
padding: 0px 0px 0px 0px;
margin: auto 10px auto auto;
border-radius: 10px;
overflow: auto;
}
.tobetoggled{
width: 45%;
float: left;
}
#small-div2{
background-color:#aaaaaa;
border: 3px solid #aaaaaa;
padding: 0px 0px 0px 0px;
margin: auto 10px auto auto;
border-radius: 10px;
overflow: auto;
}
.tobetoggled2{
width: 45%;
float: right;
}
.toggletothis{
width: 100%;
float: left;
position: fixed;
display: block;
z-index: 100;
}
.toggletothis2{
width: 100%;
float: left;
position: fixed;
display: block;
z-index: 100;
}
.whensmalldivistoggled{
display: none;
}/* when small-div is clicked, small-div toggles to class "tobetoggled" while small-div 2 simultaneously toggles to class "whensmalldivistoggled" (the display none class) */
<div id="container">
<div class="tobetoggled" onclick="function()" id="small-div">
</div>
<div class="tobetoggled2" onclick="separatefunction()" id="small-div2">
</div>
</div> <!-- end container -->
<script>
function picClicktwo() {
document.querySelectorAll("small-div, small-div2").classList.toggle("toggletothis, whensmalldivistoggled");
}
</script>
So as you can see one div is on the right, the other is on the left, each set to 45% width. So if I toggle one div to 100% width the browser still respects the other divs space instead of taking the whole 100%.
So I'm thinking if I can get the div on the right ,for example, to not display when the div on the left is toggled, it will be out of the way so the left div can take all 100%
Maybe im going about this the wrong way. Any help is welcome. Thanks.
You can create a single javascript function that sets appropriate classes on each element. Since you have only two elements it is not too complex.
HTML
<div id="container">
<div id="lefty" onclick="toggle('lefty', 'righty')">Lefty</div>
<div id="righty" onclick="toggle('righty', 'lefty')">Righty</div>
</div>
JS
function toggle(target, other)
{
var t = document.getElementById(target);
var o = document.getElementById(other);
if (!t.className || t.className == "inative")
{
t.className = "active";
o.className = "inactive";
}
else
{
t.className = "";
o.className = "";
}
}
CSS
#container {
background-color: lightgreen;
padding: 15px 0;
}
#container div {
color: white;
width: 45%;
display: inline-block;
}
#lefty {
background-color: blue;
}
#righty {
background-color: purple;
}
#container div.active {
width: 90%;
}
#container div.inactive {
display:none;
}
https://jsfiddle.net/dLbu9odf/1/
This could be made more elegant or capable of handling more elements with something like toggle(this) and then some DOM traversal and iteration in javascript, but that's a bit beyond scope. If that were the case I would recommend jQuery.

TweenLite animation suddenly changing elements' position?

First of all, you can find a simplified demo of my code in this JSFiddle and also below the question. I found that my problem happens the way I describe it in Google Chrome, so if you plan to try and fix the bug, please use that browser. I apologize if the code is not very well simplified; please consider that this is a snippet from a bigger project.
I'm working on a webapp that uses JQuery and GreenSock's TweenLite for animations.
This app consists on some menus that control everything, that are transitioned between using the bodyChange() function. This function has two parameters:
nextOrPrev, that runs one animation or another based on the value
provided ("next" or "prev"). Only the "next" animation is done yet, but that is not important for now. The "prev" animation, not yet used, just emits an alert("prev").
bodyFunction. The function provided will fill the body with the elements necessary for that menu, and the wrap them in a #bodyWrap.
In the demo I provide you with there are only two menus: The first one, mainMenu, with only a #playButton. When you click it, the bodyChange() function is called with the following parameters: ("next", playSettingsBody), playSettings being the second menu.
This is the problem: when you click the playButton, the button goes up a on the screen and then executes the TweenLite animation. I can't see, however, why does the button "jump up", instead of staying in the same place and execute the animation. This is probably due to a small mistake. What is it?
Thanks for any help.
mainMenuBody();
function mainMenuBody() {
$("body").append(
//BUTTONS
"<div id='playButton' class='mainButton'><div class='buttonText mainButtonText text'>PLAY</div></div>"
);
//WRAP
$("body").wrapInner("<div id='bodyWrap'></div>");
//BINDS
$("#playButton").bind("click", function() {
bodyChange("next", playSettingsBody);
});
}
function bodyChange(nextOrPrev, bodyFunction) {
switch (nextOrPrev) {
case "next":
//ANIMATION AND BODY CHANGE
TweenLite.to($("#bodyWrap"), .4, {
ease: Power2.easeIn,
transform: "rotateY(90deg)",
onComplete: function(){
$("body").empty();
//NEW STUFF
bodyFunction();
TweenLite.from($("#bodyWrap"), .4, {
ease: Power2.easeOut,
transform: "rotateY(90deg)"
});
}
});
//END OF ANIMATION AND BODY CHANGE
break;
case "prev":
alert("prev");
}
}
function playSettingsBody() {
$("body").append(
"<p class='text' id='CYTText'>This is the second menu!</p>"
);
}
body{
background-image: url("../resources/pics/Vignette2.png");
background-repeat: no-repeat;
background-position: center center;
background-attachment: fixed;
background-color: #02BFC1;
overflow:hidden;
margin: 0;
}
.text {
color: #FFFFFF;
font-family:Bebas Neue;
-webkit-user-select: none;
cursor: default;
text-shadow: 3px 3px 2px rgba(0,0,0,0.2);
}
.mainButton {
-webkit-transform:scale(1);
width: 200px;
height: 200px;
border: 10px solid #F1F2F0;
text-align:center;
background-color: #F37C2B;
/*background:#5F4A21;*/
display: table;
position: absolute;
margin: auto;
top: 150px;
bottom: 0;
-webkit-transition: all 0.5s ease;
cursor: pointer;
box-shadow: 0px 0px 30px rgba(0,0,0,0.4);
}
.mainButtonText {
position: relative;
display:table-cell;
vertical-align:middle;
-webkit-transform:scale(1);
font-size: 90px;
text-shadow: 4px 4px 2px rgba(0,0,0,0.2);
-webkit-transition: all 0.5s ease;
}
<script src="https://code.jquery.com/jquery-3.1.0.min.js" integrity="sha256-cCueBR6CsyA4/9szpPfrX3s49M9vUU5BgtiJj06wt/s=" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/gsap/1.19.0/TweenMax.min.js"></script>
This problem is caused in your .mainButton class. Your code looks a little like this.
.mainButton {
position: absolute;
top: 150px;
bottom: 0;
//rest
}
By removing the line bottom: 0; your JSFiddle now works as expected. However, if you remove the line top: 150px; instead and leave in the bottom: 0 the problem still occurs. Unfortunately, I cannot provide an explanation for this. It might be worth posting a question on the GSAP forums inquiring about why this occurs works when positioning using bottom but not when using top
Edit
Since you need bottom: 0 and I wasn't able to fix your code I wrote an example which works using Timeline, a GSAP plugin. You can see this JSFiddle or the code example below.
var tl = new TimelineMax();
tl.pause();
tl.fromTo($("#click"), 1, {rotationY: 0, ease: Power2.easeOut}, {rotationY: 90, transformOrigin:"right", ease: Power2.easeOut})
.set($("#click2"), {css:{display: "table"}}, "-=0.6")
.fromTo($("#click2"), 1, {rotationY: -90, ease: Power2.easeOut}, {rotationY: 0, transformOrigin:"left", ease: Power2.easeOut}, "-=0.6");
$("#click").click(function() {
tl.play();
});
$("#click2").click(function() {
tl.reverse();
});
* {
margin: 0;
padding: 0;
}
body {
background-image: url("../resources/pics/Vignette2.png");
background-repeat: no-repeat;
background-position: center center;
background-attachment: fixed;
background-color: #02BFC1;
overflow: hidden;
}
div.one, div.two {
position: absolute;
bottom: 0;
height: 200px;
width: 200px;
background: #F37C2B;
text-align: center;
display: table;
cursor: pointer;
border: 10px solid #F1F2F0;
}
div.one .text, div.two .text {
position: relative;
display: table-cell;
vertical-align: middle;
color: #FFFFFF;
font-family: Bebas Neue;
font-size: 90px;
}
div.two {
display: none;
border-color: transparent;
background: none;
}
div.two .text {
font-size: 40px;
}
<script src="https://code.jquery.com/jquery-3.1.0.min.js" integrity="sha256-cCueBR6CsyA4/9szpPfrX3s49M9vUU5BgtiJj06wt/s=" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/gsap/1.19.0/TweenMax.min.js"></script>
<div id="click" class="one">
<div class="text">
Play
</div>
</div>
<div id="click2" class="two">
<div class="text">
Second Menu
</div>
</div>

Controlling JQuery Animate Function

I've been playing with "marginLeft: "100%"" but that only moves the div off the screen entirely. I want the div, onClick, to float:right against the edge of the right side of the screen.
JSFiddle:
https://jsfiddle.net/487r8qza/
HTML
<div id="footer">
<one id="one">
</one>
<two id="two">
</two>
<three id="three">
</three>
</div>
JavaScript
$("#footer").click(function(){
$("#one").animate({
marginLeft: "+=900px",
}, 2000 );
$("#two").animate({
marginLeft: "+=900px",
}, 800 );
$("#three").animate({
marginLeft: "+=900px",
}, 333 );
});
$("#three").click(function() {
$("#three").animate({
marginLeft: "100%"} , 1000
);
});
CSS
#footer {
margin: 0;
padding: 0;
float: left;
width: 100%;
max-width: 100%;
height: 115px;
background-color: #4a4a4a;
}
one {
margin: 0;
padding: 0;
float: left;
width: 300px;
background-color: #070707;
height: 115px;
margin-left: -900px;
}
one,two,three {
text-align: center;
color: white;
font-family: "Raleway", Arial, Helvetica, Trebuchet MS, Tahoma, sans-serif;
font-weight: bold;
font-size: 16px;
line-height: 115px;
}
one:hover {
background: black;
margin: 0;
padding: 0;
width: 300px;
height: 115px;
float: left;
transition: all 0.3s ease-out;
cursor: pointer;
}
two:hover {
background: black;
margin: 0;
padding: 0;
width: 300px;
height: 115px;
float: left;
transition: all 0.3s ease-out;
cursor: pointer;
}
three:hover {
background: black;
margin: 0;
padding: 0;
width: 300px;
height: 115px;
float: left;
transition: all 0.3s ease-out;
cursor: pointer;
}
two {
margin: 0;
padding: 0;
float: left;
width: 300px;
background-color: #1a1a1a;
height: 115px;
margin-left: -900px;
}
three {
margin: 0;
padding: 0;
float: left;
width: 300px;
background-color: #2c2c2c;
height: 115px;
margin-left: -900px;
}
Sorry if it took this long, something came up. Right, so I got it working. Hope this helps
JSFIDDLE
As for CSS, I kept it as simple as possible. The trick here is to make your DIVs display inline-block, so that at the very start, they are neatly stacked next to each other. You will also want to have them all be float right.
CSS:
.box-container{
width: 100%;
height: 115px;
position: relative;
overflow: hidden;
}
.box-item{
width: 300px;
height: 115px;
position: relative;
display: inline-block;
float: right;
cursor: pointer;
}
.b0{
background: #7888D9;
}
.b1{
background: #76D54E;
}
.b2{
background: #DF7B41;
}
Next, in your HTML, you need to give each DIVs the same classname, which will simplify the Jquery click event. Finally, we will also give our first DIV a classname of "current". This will control which DIV must move and which DIV must wait and stay idle as long as the one beside him hasn't moved. You'll understand soon enough.
HTML:
<div class="box-container">
<div class="box-item b0 current">
Box 1
</div>
<div class="box-item b1">
Box 2
</div>
<div class="box-item b2">
Box 3
</div>
</div>
Finally, as for the Jquery, this is where it gets a bit complicated, I'll try to explain the best I can. Bare in mind that math is not quite my forte. Since our DIVS all float right in the CSS, well, they will all be stacked to the right (of course). To counter that and position them to the left, we need to give each DIV a right position. This position will be some kind of offset. To get this number, we need to multiply the width of a DIV by the total number of DIVs. After that, we must subtract this number to the total width of our DIVs' container (basically the browser width).
As for the click event, we must first check if the DIV we clicked has our "current" classname. If it does, we move it, if not, we don't. The easy part is moving them. By resetting a DIV's right value to 0, each one will slide accordingly to the right with our animate event. Once this is done, we switch the "current" classname to the next DIV. We then increment a counter. This will help to see if all DIVs has been moved.
Once all DIVs have been moved to the right, there is an IF statement that will check our counter and see if it is greater than our total number of DIVs. If it is, the sliding motion is inverted and all DIV's will return to the left. In the same manner, if the clicked element is not the current DIV, it will not move. if it is, it will move back to the left. When all DIV's have been move back in default position, ou counter is reset and our "current" classname is reassigned to the very first DIV.
The resize function is not optimal, but it deals with any responsive issue you could face. It will reset all DIVs to the left and recalculate the offset, so that each DIV never slide offscreen. Needs a little work, but it's better than nothing for now.
JQUERY:
var $boxWidth;
var $screenWidth;
var $offsetRight;
var $count = 0;
$(function () {
$boxWidth = $('.box-item').width();
$screenWidth = $('.box-container').width();
$offsetRight = $screenWidth - ($boxWidth*$('.box-item').length);
$('.box-item').css('right',$offsetRight);
$('.box-item').click(function(event) {
if($(this).hasClass('current')){
if($count < $('.box-item').length){
$(this).animate({
right: "0px",
}, 2000, function(){
$count++;
$(this).removeClass('current');
if($count < $('.box-item').length){
$(this).next().addClass('current');
}
else{
$(this).addClass('current');
}
});
}
else{
$(this).animate({
right: $offsetRight,
}, 2000, function(){
$count++;
$(this).removeClass('current');
console.log($count);
if($count < ($('.box-item').length*2)){
$(this).prev().addClass('current');
}
else{
$(this).addClass('current');
$count = 0;
}
});
}
}
});
window.onresize = myResize;
myResize();
});
function myResize(){
$screenWidth = $('.box-container').width();
$offsetRight = $screenWidth - ($boxWidth*$('.box-item').length);
$('.box-item').each(function(){
$(this).css('right',$offsetRight);
});
$('.box-item').eq(0).addClass('current');
$count = 0;
}

Adding A Div Caption To Divs Containing Sliders (Follow Up On Previous Q)

I currently have a grid layout made up of image sliders and text slider with square divs. I have just asked a question of how to add captions to these squares within the grid. Now I can do this nicely when the div contains a text slider. However when I try to apply the same caption to divs containing the image slider it does not work, could somebody please show me how I can do this.
CSS FOR DIVS
.slider2 { position: relative; }
.caption-box {
position: absolute;
right: 0;
height: 20px;
width:100px;
background-color: red; // change to suit
color: #fff; // change to suit
}
.trigger {
width: 200px;
height: 200px;
}
.static {
position: relative;
width: 200px;
height: 200px;
text-align: center;
font-size: 0;
border-style: solid;
border-width: 1px;
border-color: #CCCCB2;
border-radius: 5px;
}
BELOW IS THE HTML CODE OF THE TEXT SLIDER DIV WHERE THE CAPTION DIV WORKS WELL
<div class="trigger">
<div class="slider2">
<div style="border-style: solid; border-width: 1px; border-color: #CCCCB2; border-radius: 5px; height: 200px; width: 200px; color: #CCC;" class="just_text"><div class="caption-box">Monthly Plan</div>As part of our budget graphic design service we also offer a money saving monthly advertising schedule option. Whether it be for 6, 9 or 12 months we will remove all stress of advertising from your office leaving you to concentrate on your customers. </div>
<div style="border-style: solid; border-width: 1px; border-color: #CCCCB2; border-radius: 5px; height: 200px; width: 200px; color: #CCC;" class="just_text"><div class="caption-box">Web Updates</div>Our website design service also includes a money saving update scheme. For a monthly fee you can have updates to keep your website fresh and dynamic. No other company can offer this service.</div>
</div>
</div>
BELOW IS THE HTML CODE OF THE IMAGE SLIDER WHERE I CAN NOT GET THE CAPTION DIV TO WORK
<div class="trigger">
<div tabindex="0" class="maincontent static"><div class="slider2">
<img src="client9.jpg" height="200" width="200" />
<img src="client10.jpg" height="200" width="200" />
<img src="client11.jpg" height="200" width="200" />
<img src="client2.jpg" height="200" width="200" />
</div></div>
</div>
JAVASCRIPT
<script>
$(function(){
$('.slider').sss({
slideShow : true, // Set to false to prevent SSS from automatically animating.
startOn : 0, // Slide to display first. Uses array notation (0 = first slide).
transition : 400, // Length (in milliseconds) of the fade transition.
speed : 20000, // Slideshow speed in milliseconds.
showNav : true // Set to false to hide navigation arrows.
});
$('.slider2').sss({
slideShow : true, // Set to false to prevent SSS from automatically animating.
startOn : 0, // Slide to display first. Uses array notation (0 = first slide).
transition : 400, // Length (in milliseconds) of the fade transition.
speed : 10000, // Slideshow speed in milliseconds.
arrows : false // Set to false to hide navigation arrows.
});
});
</script>
CSS THAT JAVASCRIPT LINKS TO CALLED SSS.CSS
.sss {
height: 0;
margin: 0;
padding: 0;
position: relative;
display: block;
overflow: hidden;
}
.ssslide {
width: 100%;
margin: 0;
padding: 0;
position: absolute;
top: 0;
left: 0;
display: none;
overflow: hidden;
}
.ssslide img {
max-width: 100%;
height: auto;
margin: 0;
padding: 0;
position: relative;
display: block;
}
.sssnext, .sssprev {
width: 25px;
height: 100%;
margin: 0;
position: absolute;
top: 0;
background: url('images/arr.png') no-repeat;
}
.sssprev {
left: 3%;
background-position: 0 50%;
}
.sssnext {
right: 3%;
background-position: -26px 50%;
}
.sssprev:hover, .sssnext:hover {
cursor: pointer;
}.row .col .trigger .slider2 .just_text {
color: #CCC;
}
The code for the images is incomplete, and had to create my own version to be able to replicate the issue. But once that was done, the problem was easy to find. You can see it working on this JSFiddle: http://jsfiddle.net/Lbrcbhxw/2/ (I took the liberty of cleaning it a bit so it was easier to read).
The problem is that .static has a font-size:0 that makes the text invisible. Remove it (or don't wrap the div with the images with it), and the problem will be solved.
.static {
position: relative;
width: 200px;
height: 200px;
text-align: center;
/* font-size: 0; */
border-style: solid;
border-width: 1px;
border-color: #CCCCB2;
border-radius: 5px;
}
The text version isn't wrapped around that .static, so that's why it was displayed correctly and didn't have the problem.

Conflicting hover/mouseover functions

Relative newbie here. I have two different mouseover/hover functions I can get to work just fine: one, an inline mouseover that 'darkens' an image/box by making it lose opacity; and the second, text that appears over this image/box on hover (jumping up from a hidden position).
The problem is, I want to get them working together without this text losing opacity, which it does when part of the same div class as the image/box. But when I try two separate div classes and position them on top of each other (using z-index), whichever one I put on top seems to block the other one. Is there any way to have it so the image/box loses opacity, but the text that appears doesn't, all in the same mouseover/hover action?
These are the relevant bits in my stylesheet, mostly covering the text part:
.rightbox {
background: rgb(140, 183, 98);
width: 290px;
height: 160px;
margin-bottom: 18px;
padding: 2px;}
.rightboxtext {
display: table-cell;
height: 160px;
width: 290px;
vertical-align: bottom;
text-align: center;
font-weight: bold;
font-size: 20px;
color: #8CB762;
}
.rightboxtext span {
display: block;
height: 0px;
overflow: hidden;
}
.rightboxtext:hover span {
height: 80px;
}
This is the inline stuff that I used where everything, including text, gets the opacity treatment. (In this case the image is attached to the rightboxtext div class, but I also tried it attached to the rightbox div class.)
<div class="rightbox"
onmouseout="this.style.opacity=1;this.filters.alpha.opacity=100"
onmouseover="this.style.opacity=0.6;this.filters.alpha.opacity=60">
<div class="rightboxtext"
style="background-image: url(image.jpg); height: 160px; width: 290px;">
<span>Hello text.</span></div>
</div>
Otherwise I achieved this mangled bit of code, where one seems to block the other:
<div class="rightboxcontainer">
<div class="rightboxtext"
style="position: absolute; z-index: 100; height: 160px; width: 290px;">
<span>Hello text.</span></div>
<div class="rightbox"
style="position: absolute; z-index: 50; height: 160px; width: 290px;"
onmouseout="this.style.opacity=1;this.filters.alpha.opacity=100"
onmouseover="this.style.opacity=0.6;this.filters.alpha.opacity=60"><img
src="image.jpg">
</div>
</div>
With this extra bit in the stylesheet:
.rightboxcontainer { width: 290px; height: 160px; margin-bottom: 18px;}
Thanks in advance!
As a commenter pointed out above, you can do this entirely with CSS:
<style>
* {
padding: 0;
margin: 0;
}
.box {
width: 250px;
height: 250px;
overflow: hidden;
}
.box img {
width: 250px;
height: 250px;
}
.box .message {
background: rgba(0, 0, 0, 0.5);
opacity: 0;
width: 250px;
height: 250px;
position: relative;
top: -256px;
color: #fff;
font-size: 32px;
line-height: 250px;
text-align: center;
font-weight: bold;
font-family: arial;
}
.box .message:hover {
opacity: 1;
}
</style>
<div class="box">
<img src="http://www2.le.ac.uk/departments/geology/people/clark-n/personal/copy_of_images/Satellite-map-of-Antarctica/image">
<div class="message">Antarctica</div>
</div>
.message is positioned on top of the container, .box. When you hover over .message, it fades in from 0 opacity. Its background is semi-opaque (using RGBA, where the fourth value is the opacity), so it dims the image. You could make the image the background-image of the .box if you wanted to.
http://jsfiddle.net/dgGG3/4/
Fist of all, try to avoid inline event handling as you can achieve the desired result with css :hover.
The problem as you can see here http://jsfiddle.net/UjY5Q/ is with opacity on a parent element all child elements also get that opacity.
.rightbox:hover {
opacity:0.5;
}
You can cheat on that one by setting positions to the elements and overlap one to the other one. That's kind a tricky and may also need browser support.
so the easyest way to get what you want is on :hover show a transparent background image example here: http://jsfiddle.net/UjY5Q/1/
I would say that's the way to go

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