How do I animate a background color to transparent in jQuery?

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I can animate from transparent to color, but when I tell jquery to animate the backgroundColor: \'transparent\' it just changes to white. Any idea how to fix this?

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不思量自难忘°

2020-12-09 15:21

My solution was to animate to the colour seen by the user (ie. the colour of the parent element), and then set to the original colour (which may or may not be 'transparent') once the animation is finished

var $t = $(some selector);

var seenColour = findColour($t, 'background-color');
var origColour = $t.css('background-color');
$t.css('background-color', '#ffff99');
$t.animate(
    {backgroundColor: seenColour}, 
    4000, 
    function(){ $t.css('background-color', origColour)}
);

function findColour($elem, colourAttr)
{
    var colour = $elem.css(colourAttr);
    if (colour === 'transparent')
    {
        var $parent = $elem.parent();
        if ($parent)
        {
            return findColour($parent, colourAttr);
        }
        // Default to white
        return '#FFFFFF'; 
    }
    return colour;
}

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执笔经年

2020-12-09 15:21
Use background instead of backgroundColor:
```
$('#myDiv').animate({background: "transparent"});
```
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一向

2020-12-09 15:25

$(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.

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攒了一身酷

2020-12-09 15:30
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);
```
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耶瑟儿～

2020-12-09 15:31

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.

Example:

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

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清酒与你

2020-12-09 15:31

Use CSS transition:

$('smth').css('transition','background-color 1s').css('background-color','transparent')

$('h1').css({'transition':'background-color 1s','background-color':'red'})

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