CSS background via jQuery

Question

I am trying to add a CSS attribute using jQuery but having an issue with the Background selector. Right now I have:

$('#nav_wrap').css({ 'position': 'fixed',
                     'margin-top':0,
                     'z-index':400,
                     'background-color': 'red',
                     'top':0,
                     'left':0 });

which gives the the color Red just fine, nothing wrong with the code. What I want to do is make it a gradient but when I change it to this:

 $('#nav_wrap').css({ 'position': 'fixed',
                      'margin-top':0,
                      'z-index':400,
                      'background': 'linear-gradient(top, #dc0000 0%,#650101 100%)',
                      'top':0, 'left':0 });

The background attribute doesnt get recognized. Any ideas why? Thanks.

Answer 1

As you demonstrated up to use classes instead of manually setting each CSS property for such purpose in the comments, here's how you would do it cross browser (IE8+):

CSS

.yourClass {
  position: fixed;
  margin-top: 0;
  z-index: 400;
  top: 0;
  left: 0;

  /* Safari 5.1, Chrome 10+ */
  background-image: -webkit-linear-gradient(top, #dc0000, #650101);

  /* Safari 4+, Chrome 2+ */
  background-image: -webkit-gradient(linear, 0 0, 0 100%, from(#dc0000), to(#650101));

  /* FF 3.6+ */
  background-image: -moz-linear-gradient(top, #dc0000, #650101); 

  /* Opera 11.10 */ 
  background-image: -o-linear-gradient(top, #dc0000, #650101);

  /* Standard, IE 10 */
  background-image: linear-gradient(to bottom, #dc0000, #650101);

  /* IE8 */
  filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#ffdc0000', endColorstr='#ff650101', GradientType=0);
}

JS

$('#nav_wrap').addClass("yourClass");

Answer 2

Why don't you use classes and than add and remove class using jquery

$('#check').addClass('gradient'); //add class
$('#check').removeClass('gradient'); //remove class

FIDDLE

Answer 3

Try

$('#nav_wrap').css({ 'position': 'fixed',
                  'margin-top':0,
                  'z-index':400,
                  'background': 'linear-gradient(to bottom, #dc0000 0%,#650101 100%)',
                  'top':0, 'left':0 });

Answer 4

用这个 ：

background: "-webkit-gradient(linear)