Hover function repeating whenever you move mouse inside selector - javascript

I have an animation that fires on hover inside certain divs. When the mouse is in the div, moving it to a different location in the div causes the hover effect to trigger again. I've tried using mouseenter/mouseleave and that does the same thing.
How can I make the function only trigger on mouseenter and mouseleave and not whenever it moves inside the selector?
DEMO
$('#nav, #footer, #leftNav, #rightNav').hover(function() {
$('#navFill').animate({
left: 0
}, 300);
$('#footerFill').animate({
left: 0
}, 300);
$('#leftNavFill').animate({
top: 0
}, 300);
$('#rightNavFill').animate({
top: 0
}, 300);
}, function() {
$('#navFill').animate({
left: '-100vw'
}, 300);
$('#footerFill').animate({
left: '100vw'
}, 300);
$('#leftNavFill').animate({
top: '100vh'
}, 300);
$('#rightNavFill').animate({
top: '-100vh'
}, 300);
});


According to your code you are calling both the animation at the same hover event, or lets say you are trying to animate it at the same mouseenter and mouseleave event. Instead of it try something like this.
$('#nav, #footer, #leftNav, #rightNav').mouseenter(function() {
console.log("mouseenter");
$('#navFill').animate({
left: 0
}, 300);
$('#footerFill').animate({
left: 0
}, 300);
$('#leftNavFill').animate({
top: 0
}, 300);
$('#rightNavFill').animate({
top: 0
}, 300);
});
$('#navFill, #footerFill, #leftNavFill, #rightNavFill').mouseleave(function() {
console.log("mouseleave");
$('#navFill').animate({
left: '-100vw'
}, 300);
$('#footerFill').animate({
left: '100vw'
}, 300);
$('#leftNavFill').animate({
top: '100vh'
}, 300);
$('#rightNavFill').animate({
top: '-100vh'
}, 300);
});
#nav {
background-color: rgba(86, 55, 144, 0.95);
width: 100vw;
height: 7.5vh;
z-index: 10;
box-shadow: 0px 2px 3px #000;
position: fixed;
}
#navBars {
position: absolute;
left: 5vw;
transform: scaleY(.75);
line-height: 7.5vh;
cursor: pointer;
color: #f0f0f0;
}
#navigation {
margin-left: 10vw;
}
.navigation {
display: inline;
position: relative;
left: -3vw;
margin-left: 3vw;
font-family: 'Josefin Sans', sans-serif;
font-weight: 700;
font-size: 28px;
line-height: 7.5vh;
cursor: pointer;
color: #f0f0f0;
}
#leftNav {
height: 100vh;
width: 2vw;
background-color: rgba(86, 55, 144, 1);
position: fixed;
z-index: 11;
box-shadow: 2px 0px 3px #000;
}
#rightNav {
height: 100vh;
width: 2vw;
left: 98vw;
background-color: rgba(86, 55, 144, 1);
position: fixed;
z-index: 11;
box-shadow: -2px 0px 3px #000;
}
#footer {
background-color: rgba(86, 55, 144, 0.95);
width: 100vw;
height: 5vh;
top: 95vh;
z-index: 10;
box-shadow: 0px -2px 3px #000;
position: fixed;
}
#navFill {
background-color: rgba(240, 240, 240, .95);
width: 100vw;
left: -100vw;
height: 7.5vh;
z-index: 10;
position: fixed;
}
#footerFill {
background-color: rgba(240, 240, 240, .95);
width: 100vw;
left: 100vw;
top: 95vh;
height: 5vh;
z-index: 10;
position: fixed;
}
#leftNavFill {
height: 100vh;
width: 2vw;
background-color: rgba(240, 240, 240, 1);
top: 100vh;
position: fixed;
z-index: 11;
box-shadow: 2px 0px 3px #000;
}
#rightNavFill {
height: 100vh;
width: 2vw;
left: 98vw;
background-color: rgba(240, 240, 240, 1);
top: -100vh;
position: fixed;
z-index: 12;
box-shadow: 2px 0px 3px #000;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<nav id="nav">
<i class="fa fa-bars fa-3x" id="navBars"></i>
<ul id="navigation">
<li id="homeNav" class="navigation">Home</li>
<li id="aboutNav" class="navigation">About</li>
<li id="portNav" class="navigation">Portfolio</li>
<li id="contactNav" class="navigation">Contact</li>
</ul>
</nav>
<div id="leftNav"></div>
<div id="rightNav"></div>
<footer id="footer">
</footer>
<div id="leftNavFill"></div>
<div id="rightNavFill"></div>
<div id="navFill"></div>
<div id="footerFill"></div>
Here is the Updated Fiddle
And also as soon as the mouse enters the div you are animating navFill and others which are not the same divisions to which the mousenter event is binded. So the mouseleave event executes at the same time because of the animation which cause the div to animate and thus the mouseleave event executes.


I think the problem lies with your animated DIVs (i.e. #navFill, #leftNavFill, #rightNavFill, and #footerFill) being above your non-animated DIVs (i.e. #nav, #leftNav, #rightNav, and #footer). When an animated DIV gets animated, it repaints the non-animated DIV below it causing it to trigger the mouseenter/mouseleave event. Maybe in simple terms, as soon as the grey bar covers the purple area and the mouse, you just left the purple area (which causes the mouseleave event). And vice-versa, when the grey bar uncovers the purple area.
So, the problem came down to how do I make the animated DIVs appear above the non-animated DIVs without them being selectable? You can attach the CSS property pointer-events: none to your animated DIVs.
Demo


The animation might cause the whole nav to shrink, because of this, the navigation consider the mouse "just enter" into the nav.

Related

How to create a triangle shape with an inner curved base in React Native

how to create a triangle using style sheet with an inner curved base ? I know how to create a triangle by using style sheet . Please consider following code
triangleShapeLeft: {
width: 0,
height: 0,
backgroundColor: 'transparent',
borderStyle: 'solid',
borderLeftWidth: halfHeight / 3,
borderRightWidth: halfHeight / 3,
borderBottomWidth: halfHeight / 2,
borderLeftColor: 'transparent',
borderRightColor: 'transparent',
borderBottomColor: "#000",
transform: [
{ rotate: '270deg' }
],
margin: 0,
marginLeft: 0,
borderWidth: 0,
borderColor: "transparent",
position: "absolute",
left: -arrowBottom - padddingVertical,
top: halfHeight - padddingVertical,
}
this will be a normal triangle. but my question is how can I bent one side of this triangle just like below image
I already tried using border Radius, But it will only curve outer circle way. I want an inner circle curve. Please help me to achieve this.

This is not a good solution, better use SVG. There is an excelent svg module, developed by react-native community and up to date:
https://github.com/react-native-community/react-native-svg

You can consider a solution with a pseudo element but without transparency:
.arrow {
margin: 20px;
width: 100px;
height: 100px;
border-radius: 5px;
background: #000;
transform: rotateX(50deg) rotate(-45deg);
position: relative;
overflow:hidden;
z-index:0;
}
.arrow:before {
content: "";
position: absolute;
top: 0;
left: 0;
height: 160%;
width: 160%;
border-radius: 90% 0 0 0;
background: #fff;
}
<div class="arrow">
</div>

You can overlay the side of arrow using a circle. this way you can hide the part you don't wanna show. The hack is to the same color as background for body or parent container.
Here fiddle: https://jsfiddle.net/sumitridhal/rod6hn0b/
<html><head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<title>Arrow</title>
<style type="text/css">
html, body {
margin: 0px;
padding: 0px;
font-family: 'Source Sans Pro', sans-serif;
color: #333333;
}
.row {
width: 500px;
clear: both;
margin: 20px auto;
}
.arrow.right {
width: 0px;
height: 0px;
border: 50px solid transparent;
border-top-color: #446CB3;
margin: 0;
padding: 0;
float: left;
transform: rotate(270deg) translate(0px, 25px);
}
.arrow:before {
content: '';
height: 140px;
width: 70px;
border-bottom-right-radius: 140px;
border-top-right-radius: 140px;
background: #ffffff;
display: inline-block;
transform: rotate(90deg) translate(-135px, 35px);
}
</style>
</head>
<body>
<div class="row" style="
overflow: hidden;
">
<div class="arrow right" style="
/* overflow: hidden; */
"></div>
</div>
</body></html>

Loading Animation and grayed-out background not working

I just want to have a loading animation with grayed-out background upon clicking TestLoading button. But I can't get it right. The loading gif is slightly in the left side but I want it in the center. Also grayed-out background is not working.
Here's my css:
.divLoader {
margin: 0px;
padding: 0px;
position: fixed;
right: 0px;
top: 0px;
width: 100%;
height: 100%;
background-color: rgb(67, 71, 75);
z-index: 30001;
opacity: 0.8;
}
.divLoaderContent {
position: absolute;
color: White;
top: 50%;
left: 40%;
}
In my view, I have this:
<!--LOADER -->
<div id="divProcessing" class="divLoader">
<p class="divLoaderContent"><img src="~/Content/image/blocks.gif"></p>
</div>
and
$('#btnRoster1').click(function(e) {
$("#divProcessing").show();
});

Here is revised version of css:
.divLoader{
display: none;
position: fixed;
top: 0;
left: 0;
width: 100%;
height: 100%;
background-color: rgba(67, 71, 75, 0.8);
z-index: 30001;
}
.divLoaderContent{
position: absolute;
color: White;
top: 50%;
left: 0;
right: 0;
margin: auto;
transform: translateY(-50%);
}
And don't use p tag for img container. Use div instead

To animate .show() use
$('#btnRoster1').click(function(e) {
$("#divProcessing").show(800);
});
where 800 is 0.8 sec.
To align the gif you can use flex and get rid of absolute positioning:
.divLoaderContent {
color: White;
display: flex;
justify-content: center;
}

Moving elements (especially img tags) with top/left based on percentages can get messy because it depends on the img size. I recommend using flex with this approach. The justify-content will center the children horizontally and align-items will center vertically when display is flex
.divLoader {
margin: 0px;
padding: 0px;
position: fixed;
right: 0px;
top: 0px;
width: 100%;
height: 100%;
background-color: rgb(67, 71, 75);
z-index: 30001;
opacity: 0.8;
display: none;
justify-content: center;
align-items: center;
}
Then have your js just modify display in css to flex when you want it to show, then display: none when you want it to hide;
$('#btnRoster1').click(function(e) {
$("#divProcessing").css('display', 'flex');
});
Fiddle below (has a timeout after 3 seconds to simulate something loading) I took out the unnecessary <p> tag as well.
https://jsfiddle.net/Garrito/vh2ttmu9/35/

How can I trigger the width style of a class to another?

I have these 2 objects in my HTML:
//1st object
<span class="ui-slider-handle" tabindex="0" style="left: 15.3153%;"></span>
//2nd object
<div id="waveform">
<wave style="display: block; position: relative; user-select: none; height: 50px; overflow-x: auto; overflow-y: hidden;">
<canvas></canvas>
<wave style="position: absolute; z-index: 2; left: 0px; top: 0px; bottom: 0px; overflow: hidden; width: 0px; display: block; box-sizing: border-box; border-right: 1px solid rgb(255, 255, 255);"><canvas width="350" height="50" style="width: 350px;"></canvas></wave>
</wave>
</div>
Is it possible using Javascript/jQuery connect the percentage of the "left" css attribute of the ui-slider-handle class to the width of the inner wave and triggering all the time the percentage (of the 1st object) change?
My 1st try
$(document).ready(function(){
var playlist = [{
title:"Hidden",
artist:"Miaow",
mp3:"http://www.jplayer.org/audio/mp3/Miaow-02-Hidden.mp3",
oga:"http://www.jplayer.org/audio/ogg/Miaow-02-Hidden.ogg",
poster: "https://i.imgur.com/sCbrzQa.png"
},{
title:"Cro Magnon Man",
artist:"The Stark Palace",
mp3:"http://www.jplayer.org/audio/mp3/TSP-01-Cro_magnon_man.mp3",
oga:"http://www.jplayer.org/audio/ogg/TSP-01-Cro_magnon_man.ogg",
poster: "https://i.imgur.com/lXvsuBu.png"
},{
title:"Bubble",
m4a: "http://www.jplayer.org/audio/m4a/Miaow-07-Bubble.m4a",
oga: "http://www.jplayer.org/audio/ogg/Miaow-07-Bubble.ogg",
poster: "https://i.imgur.com/klJKSVZ.jpg"
}];
var cssSelector = {
jPlayer: "#jquery_jplayer",
cssSelectorAncestor: ".music-player"
};
var options = {
swfPath: "http://cdnjs.cloudflare.com/ajax/libs/jplayer/2.6.4/jquery.jplayer/Jplayer.swf",
supplied: "ogv, m4v, oga, mp3",
volumechange: function(event) {
$( ".volume-level" ).slider("value", event.jPlayer.options.volume);
},
timeupdate: function(event) {
$( ".progress" ).slider("value", event.jPlayer.status.currentPercentAbsolute);
}
};
var myPlaylist = new jPlayerPlaylist(cssSelector, playlist, options);
var PlayerData = $(cssSelector.jPlayer).data("jPlayer");
// Create the volume slider control
$( ".volume-level" ).slider({
animate: "fast",
max: 1,
range: "min",
step: 0.01,
value : $.jPlayer.prototype.options.volume,
slide: function(event, ui) {
$(cssSelector.jPlayer).jPlayer("option", "muted", false);
$(cssSelector.jPlayer).jPlayer("option", "volume", ui.value);
}
});
// Create the progress slider control
$( ".progress" ).slider({
animate: "fast",
max: 100,
range: "min",
step: 0.1,
value : 0,
slide: function(event, ui) {
var sp = PlayerData.status.seekPercent;
if(sp > 0) {
// Move the play-head to the value and factor in the seek percent.
$(cssSelector.jPlayer).jPlayer("playHead", ui.value * (100 / sp));
} else {
// Create a timeout to reset this slider to zero.
setTimeout(function() {
$( ".progress" ).slider("value", 0);
}, 0);
}
}
});
$( ".ui-slider-range" ).slider({
change: function( event, ui ) {
$('wave').css('width', ui.value)
}
});
});
*, *:before, *:after {
box-sizing: border-box;
}
html {
min-height: 100%;
}
body {
background: #eee;
font-family: "Open Sans", sans-serif;
}
.music-player {
position: relative;
width: 350px;
height: 370px;
margin: 50px auto;
box-shadow: 0 0 60px rgba(0, 0, 0, 0.8);
border-radius: 10px;
background: #222;
overflow: hidden;
z-index: 0;
}
.music-player img {
position: absolute;
top: 0px;
left: 0px;
bottom: 0px;
right: 0px;
z-index: -1;
display: block;
width: 100% !important;
height: 100% !important;
-webkit-filter: blur(2px);
filter: blur(2px);
}
.music-player .info {
width: 100%;
height: 100px;
background: #222;
background: rgba(0, 0, 0, 0.8);
text-align: center;
position: relative;
}
.music-player .info .jp-playlist li {
display: none;
}
.music-player .info .jp-playlist li a {
font-size: 30px;
font-weight: 300;
text-decoration: none;
color: #fff;
color: rgba(225, 225, 225, 0.4);
}
.music-player .info .jp-playlist li a span {
font-size: 14px;
display: block;
margin-top: 10px;
}
.music-player .info .jp-playlist li.jp-playlist-current {
display: block;
}
.music-player .info .jp-playlist li .jp-free-media, .music-player .info .jp-playlist li .jp-playlist-item-remove {
display: none;
}
.music-player .info .left, .music-player .info .right {
width: 25px;
position: absolute;
top: 30px;
left: 30px;
}
.music-player .info .right {
left: auto;
right: 30px;
}
.music-player .info [class^="icon-"] {
margin: 0 0 10px;
}
.music-player .info .center {
padding: 20px 0 0;
}
.music-player .progress, .music-player .volume-level {
width: 100%;
height: 5px;
display: block;
background: #ccc;
position: absolute;
bottom: 0px;
cursor: pointer;
border: none;
}
.music-player .progress .ui-slider-range, .music-player .volume-level .ui-slider-range {
display: block;
background: #ed553b;
height: 5px;
border-radius: 0;
}
.music-player .progress .ui-slider-handle, .music-player .volume-level .ui-slider-handle {
position: absolute;
top: -8px;
width: 8px;
height: 22px;
background: url("//i.imgur.com/tsqwz1N.png") no-repeat center;
border: none;
outline: none;
margin: 0 0 0 -3px;
cursor: move;
}
.music-player .controls {
text-align: center;
width: 100%;
height: 190px;
background: #982e4b;
background: rgba(152, 46, 75, 0.6);
}
.music-player .controls .current {
font-size: 48px;
color: #fff;
color: rgba(225, 225, 225, 0.4);
padding: 15px 0 20px;
}
.music-player .controls .play-controls a {
display: inline-block;
width: 35px;
height: 40px;
margin: 0 30px;
}
.music-player .controls .volume-level {
position: relative;
bottom: auto;
width: 200px;
height: 2px;
margin: 30px auto 0;
background: rgba(225, 225, 225, 0.3);
}
.music-player .controls .volume-level .ui-slider-range {
height: 2px;
}
.music-player .controls .volume-level .ui-slider-handle {
top: -8px;
margin-left: -9px;
width: 22px;
height: 22px;
background-image: url("http://image.flaticon.com/icons/svg/106/106874.svg");
}
.music-player .controls .volume-level .icon-volume-up, .music-player .controls .volume-level .icon-volume-down {
position: absolute;
right: -34px;
top: -8px;
width: 22px;
}
.music-player .controls .volume-level .icon-volume-down {
right: auto;
left: -27px;
}
[class^="icon-"] {
width: 18px;
height: 18px;
background: url("//i.imgur.com/E09T8tf.png") no-repeat center;
display: block;
}
.icon-shuffle {
background-image: url("http://image.flaticon.com/icons/svg/148/148739.svg");
}
.icon-heart {
background-image: url("http://image.flaticon.com/icons/svg/126/126499.svg");
}
.icon-repeat {
background-image: url("http://image.flaticon.com/icons/svg/137/137485.svg");
}
.icon-share {
background-image: url("http://image.flaticon.com/icons/svg/189/189676.svg");
}
.icon-previous {
background-image: url("http://image.flaticon.com/icons/svg/137/137518.svg");
}
.icon-play {
background-image: url("http://image.flaticon.com/icons/svg/148/148744.svg");
}
.icon-pause {
background-image: url("http://image.flaticon.com/icons/svg/189/189639.svg");
}
.icon-next {
background-image: url("http://image.flaticon.com/icons/svg/137/137517.svg");
}
.icon-volume-up {
background-image: url("http://image.flaticon.com/icons/svg/149/149139.svg");
}
.icon-volume-down {
background-image: url("http://image.flaticon.com/icons/svg/109/109699.svg");
}
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jqueryui/1.12.1/jquery-ui.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jplayer/2.6.4/jquery.jplayer/jquery.jplayer.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jplayer/2.6.4/add-on/jplayer.playlist.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/wavesurfer.js/1.0.52/wavesurfer.min.js"></script>
</head>
<div class="music-player">
<div style="background-image: url(https://image.freepik.com/free-vector/welcome-summer-badge-on-blurry-background_23-2147511412.jpg);" class="album"></div>
<div class="info">
<div class="left">
</div>
<div class="center">
<div class="jp-playlist">
<ul>
<li></li>
</ul>
</div>
</div>
<div class="right">
</div>
<div class="progress"></div>
</div>
<div class="demo">
<div id="waveform">
</div>
<script>
var ctx = document.createElement('canvas').getContext('2d');
var linGrad = ctx.createLinearGradient(0, 64, 0, 200);
linGrad.addColorStop(0.5, 'rgba(255, 255, 255, 1.000)');
linGrad.addColorStop(0.5, 'rgba(183, 183, 183, 1.000)');
var wavesurfer = WaveSurfer.create({
container: '#waveform',
waveColor: linGrad,
progressColor: 'hsla(200, 100%, 30%, 0.5)',
cursorColor: '#fff',
normalize: true,
backend: 'MediaElement',
height:50,
barWidth: 3
});
//Set peaks
wavesurfer.backend.peaks = [0.0218, 0.0183, 0.0165, 0.0198, 0.2137, 0.2888, 0.2313, 0.15, 0.2542, 0.2538, 0.2358, 0.1195, 0.1591, 0.2599, 0.2742, 0.1447, 0.2328, 0.1878, 0.1988, 0.1645, 0.1218, 0.2005, 0.2828, 0.2051, 0.1664, 0.1181, 0.1621, 0.2966, 0.189, 0.246, 0.2445, 0.1621, 0.1618, 0.189, 0.2354, 0.1561, 0.1638, 0.2799, 0.0923, 0.1659, 0.1675, 0.1268, 0.0984, 0.0997, 0.1248, 0.1495, 0.1431, 0.1236, 0.1755, 0.1183, 0.1349, 0.1018, 0.1109, 0.1833, 0.1813, 0.1422, 0.0961, 0.1191, 0.0791, 0.0631, 0.0315, 0.0157, 0.0166, 0.0108];
//Draw peaks
wavesurfer.drawBuffer();
</script>
</div>
<div class="controls">
<div class="current jp-current-time">00:00</div>
<div class="play-controls">
</div>
<div class="volume-level">
</div>
</div>
<div id="jquery_jplayer" class="jp-jplayer"></div>
</div>
UPDATE
The code above creates 2 different slider selector, also the slider affect the width of the wave object. Instead of I need something like this:

I am assuming you're using the UI Slider from jQuery. Once you initialise it, you can use the change event as follows:
$( ".ui-slider-handle" ).slider({
change: function( event, ui ) {
$('wave').first().next().css('width', ui.value)
}
});
Edit: I just realised you wanted the second wave so I added .next()

What you are looking for is MutationObserver(). It allows you to register any change in element's attribute and act on it.
Be sure to check browser support, as it is very likely that it does not include what you actually need.

JS Slide toogle sidebars out and expand content div

I want to slide out my both sidebars and expand the width of my middle content div but at the same time and on a again click I want to toogle it back to original.
What I tried so far
$('.headbar').click(function () {
$(".leftside").animate({width: 'toggle'});
$( ".rightside" ).animate({
width: "toggle"
}, 300, function() {
$(".content").animate({width: '1200px'});
});
});
My Problems
headbar is flashing when animation start (but guess its CSS bug)
content is not toggle back to original
My Concept for understanding

I would approach this using a CSS class transition effect toggled by jQuery instead of using jQuery animate function.
Working Demo:
$(document).ready(function() {
$('body').on('click', '.headbar', function(){
$('body').toggleClass('expanded');
});
});
.headbar {
width: 100%;
background: #303030;
background-repeat: repeat;
background-size: 38px 133px;
height: 40px;
background-position: 0px 39px;
box-shadow: 0px 1px 5px;
position: fixed;
z-index: 1000;
margin-top: -40px;
}
.leftside {
position: fixed;
left: 2%;
top: 100px;
height: 500px;
width: 13%;
background-color: rgba(123, 123, 123, 0.95);
}
.rightside {
position: fixed;
right: 2%;
top: 100px;
height: 500px;
width: 13%;
background-color: rgba(123, 123, 123, 0.95);
}
.scrollable {
position: relative;
top: 20px;
min-height: 700px;
width: 70%;
margin: 0 auto;
box-shadow: 0px 1px 5px;
background: white;
}
/* ===================== */
/* expanded transition
/* ===================== */
.leftside, .rightside, .scrollable {
transition:0.3s;
}
body.expanded .scrollable {
width:100%;
}
body.expanded .leftside {
left: -100%;
}
body.expanded .rightside {
right: -100%;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<div class="headbar"></div>
<div class="leftside"></div>
<div class="rightside"></div>
<div class="scrollable"></div>
jsFiddle

Why the image does not fade in on top of existing image

I have the following code:
HTML CODE:
<table border=0 cellpadding=0 cellspacing=0 width=250px bgcolor=#FF0000>
<tr>
<td align=right><span id=spnMain></span>
</td>
</tr>
</table>
CSS CODE:
#spnMain {
background: url("theImages/searchButton.png") no-repeat;
background-position: 0px 0px;
width: 28px;
display: block;
height: 28px;
cursor: pointer;
}
#spnMain span {
background: url("theImages/searchButton.png");
display: block;
height: 50px;
background-position: 0px -56px;
}
JS CODE:
$(document).ready(function () {
$("#spnMain").wrapInner("<span></span>");
$("#spnMain span").css({
"opacity": 0
});
$("#spnMain").hover(function () {
$(this).children("span").animate({
"opacity": 1
}, 400);
}, function () {
$(this).children("span").animate({
"opacity": 0
}, 400);
});
});
Produces the following (the top is onload and the bottom when mouse is hovered:
How can I make the green button fade in on top of the purple button so it hides it?

I know you ask for a javascript solution but you can do the same thing with css only (if you want to)
Way 1, sprites, no animation though: http://jsfiddle.net/NicoO/WBjS5/
Way 2, two images, css transition (a bit hacky): http://jsfiddle.net/NicoO/WBjS5/6/
#spnMain
{
display: block;
height: 28px;
width: 28px;
background-image: url(**url to green button image**);
background-position: 0% 0%;
position: relative;
}
#spnMain:after
{
position: absolute;
width: inherit;
height: inherit;
top: 0;
left: 0;
content:"";
transition-duration: 0.4s;
visibility: hidden;
opacity: 0;
background-image: url(**url to red button image**);
}
#spnMain:hover:after
{
visibility: visible;
opacity: 1;
}
Update the visibility property helps for IE8 support- no transition will occur, but the image will be swapped on mouse over. What should be good enough of a fallback for old "browsers".

#spnMain {
position: relative;
/* ... same as before ... */
}
#spnMain span {
position: absolute;
top: 0;
right: 0;
/* ... same as before */
}

And your answer is:
Fiddle link: http://jsfiddle.net/LNQq3/4/
CSS Code:
#spnMain {
background: url("http://s18.postimg.org/balg05zj9/gogo.gif?noCache=1393616120") no-repeat;
background-position: 0px -5px;
width: 28px;
display: block;
height: 28px;
cursor: pointer;
}
#spnMain:hover {
background-position: -37px -5px;
}

Have you tried using an absolute positioned element within a relative positioned element (http://css-tricks.com/absolute-positioning-inside-relative-positioning/)?
I have put together a quick jsfiddle demonstrating this: http://jsfiddle.net/9xENQ/
I just grabbed a quick GO/STOP image sprite and didn't take the time to really look into the necessary background-position to make it line up perfectly. Just wanted to convey the concept.
The HTML:
<div class="button-container">
Hi here is a bunch of text with a padding right to keep it from bleeding into the image.
<span id="spnMain"></span>
</div>
The CSS:
.button-container {
position: relative;
padding-right: 160px;
width: 158px;
height: 163px;
border: 1px solid black;
}
#spnMain {
background: url("https://encrypted-tbn2.gstatic.com/images?q=tbn:ANd9GcQ2m3WvngUNXOeQ4oItfopBO5VSA3OP7hhaHsjMrwHLlzYR4KeZPA") no-repeat;
background-position: 0px 0px;
width: 158px;
display: block;
height: 163px;
cursor: pointer;
position: absolute;
top: 0;
left: 100%;
margin-left: -158px;
}
#spnMain span {
background: url("https://encrypted-tbn2.gstatic.com/images?q=tbn:ANd9GcQ2m3WvngUNXOeQ4oItfopBO5VSA3OP7hhaHsjMrwHLlzYR4KeZPA");
display: block;
width: 158px;
height: 163px;
background-position: -158px 0px;
position: absolute;
left: 100%;
top: 0;
margin-left: -158px;
}
Your JavaScript (as is):
$(document).ready(function() {
$("#spnMain").wrapInner("<span></span>");
$("#spnMain span").css({"opacity" : 0});
$("#spnMain").hover(function(){
$(this).children("span").animate({"opacity" : 1}, 400);
}, function(){
$(this).children("span").animate({"opacity" : 0}, 400);
});
});

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