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The working of the jQuery background colour animate – Suppose we have a div element and we need to apply the background colour animation effects. So we can use the animate() function as “$('#bid'). animate({ backgroundColor: “gray”, color: “white” })”, which will change the background colour of the selected element.
If you just want your element to be transparent, it's really as easy as : background-color: transparent; But if you want it to be in colors, you can use: background-color: rgba(255, 0, 0, 0.4);
click(function() { var color = $( this ). css( "background-color" ); $( "p" ). html( "That div is " + color + "." ); });
Changing the opacity of the background color only To achieve this, use a color value which has an alpha channel—such as rgba. As with opacity , a value of 1 for the alpha channel value makes the color fully opaque. Therefore background-color: rgba(0,0,0,. 5); will set the background color to 50% opacity.
Transparent isn't really a color. So, you can't animate to it. You might be able to achieve the effect you're looking for by using a separate element for the background, and animating the opacity though.
HTML:
<body style="background-color:yellow">
<!-- by default, "see through" to parent's background color -->
<div id="container">
Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Aenean nec magna. Nulla eu mi sit amet nibh pellentesque vehicula.
Vivamus congue purus non purus. Nam cursus mollis lorem.
</div>
</body>
Script:
// on load...
$(function()
{
var container = $("#container");
container
.hover(
// fade background div out when cursor enters,
function()
{
$(".background", this).stop().animate({opacity:0});
},
// fade back in when cursor leaves
function()
{
$(".background", this).stop().animate({opacity:1})
})
// allow positioning child div relative to parent
.css('position', 'relative')
// create and append background div
// (initially visible, obscuring parent's background)
.append( $("<div>")
.attr('class', 'background')
.css({
backgroundColor:'blue',
position: 'absolute',
top:0,
left:0,
zIndex:-1,
width:container.width(),
height:container.height()
})
);
});
Kingjeffrey's comment points out that this answer is somewhat outdated - browsers do now support RGBA color values, so you can animate just the background. However, jQuery doesn't support this in core - you'll need a plugin. See also: jQuery + RGBA color animations
I wanted to do this and since I couldn't find it, I hacked it together. This is only for white, suit to your needs:
function animate_bg(ele, from, to) {
ele.css("background-color", "rgba(255, 255, 255, " + (from += from > to ? -1 : 1) / 10 + ")");
if(from != to)
setTimeout(function() { animate_bg(ele, from, to) }, 20);
}
Usage:
$("a").hover(
function() {return animate_bg($(this), 0, 10)},
function() {return animate_bg($(this), 10, 0)}
);
$(selector)
.css({backgroundColor:"#f00"})
.animate({backgroundColor:"transparent"}, 2000, null,
function() { this.style.backgroundColor='transparent'; });
Not as clean because it fades the bg to white before making it transparent, but it's an option.
You can use rgba(61, 31, 17, 0.5) color where 0.5 is the opacity. Then if you want transparent set the opacity to 0.0
$('.myClass').animate({ "backgroundColor" : "rgba(61, 31, 17, 0.0)" }, 1000);
I used the answer of Linus but ran into IE. Changed it about a bit to work in IE as well:
function animate_bg(ele, from, to) {
from += from > to ? -1 : 1;
if(!$.support.opacity){
if(from != to){
var opStr = (Math.round(from * 25.5)).toString(16);
//alert(opStr)
ele.css({background:'transparent',filter:"progid:DXImageTransform.Microsoft.gradient(startColorstr=#" + opStr + "FFFF00, endColorstr=#" + opStr + "FFFF00)"});
}else{
ele.css({background:'transparent',filter:"none"});
}
}else{
ele.css("backgroundColor", "rgba(255, 255, 0, " + (from) / 10 + ")");
}
if(from != to)
setTimeout(function() { animate_bg(ele, from, to) }, 50);
}
Usage is the same:
$("a").hover(
function() {return animate_bg($(this), 0, 10)},
function() {return animate_bg($(this), 10, 0)}
);
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