Rotating a background image with CSS3

Question

I have a background image that has an arrow that points to the right. When a user clicks on the button, the selected state changes the arrow to point down (using a different background position in my image sprite).

Is there anyway to animate this using CSS3 so once the button is clicked and jQuery assigns it a "selected" class, it will rotate in an animation (only 90 degrees) from the right to down? (preferably using the single image/position with the arrow that points to the right)

I'm unsure as to whether transform or key animation frames need to be used.

See also: [How to rotate the background image in the container?](http://stackoverflow.com/q/5087420/1591669) — unor, Feb 14 '15 at 00:51

score 20 · Accepted Answer · edited Feb 19 '17 at 22:47

you could use the ::after (or ::before) pseudo-element, to generate the animation

div /*some irrelevant css */
{
    background:-webkit-linear-gradient(top,orange,orangered);
    background:-moz-linear-gradient(top,orange,orangered);
    float:left;padding:10px 20px;color:white;text-shadow:0 1px black;
    font-size:20px;font-family:sans-serif;border:1px orangered solid;
    border-radius:5px;cursor:pointer;
}

/* element to animate */
div::after               /* you will use for example "a::after" */
{
    content:' ►';        /* instead of content you could use a bgimage here */
    float:right;
    margin:0 0 0 10px;
    -moz-transition:0.5s all;
    -webkit-transition:0.5s all;
}

/* actual animation */
div:hover::after         /* you will use for example "a.selected::after" */
{
    -moz-transform:rotate(90deg);
    -webkit-transform:rotate(90deg);
}

HTML:

<div>Test button</div>

in your case you will use element.selected class instead of

jsfiddle demo: http://jsfiddle.net/p8kkf/

hope this helps

::after is more correct, but :after is better supported, both refer to the same thing — , Sep 06 '13 at 21:56

score 10 · Answer 2 · answered Mar 02 '13 at 05:14

Here is a rotating css class that I have used to spin a background image:

.rotating {
  -webkit-animation: rotating-function 1.25s linear infinite;
     -moz-animation: rotating-function 1.25s linear infinite;
      -ms-animation: rotating-function 1.25s linear infinite;
       -o-animation: rotating-function 1.25s linear infinite;
          animation: rotating-function 1.25s linear infinite;
}

@-webkit-keyframes rotating-function {
  from {
    -webkit-transform: rotate(0deg);
  }
  to {
    -webkit-transform: rotate(360deg);
  }
}

@-moz-keyframes rotating-function {
  from {
    -moz-transform: rotate(0deg);
  }
  to {
    -moz-transform: rotate(360deg);
  }
}

@-ms-keyframes rotating-function {
  from {
    -ms-transform: rotate(0deg);
  }
  to {
    -ms-transform: rotate(360deg);
  }
}

@-o-keyframes rotating-function {
  from {
    -o-transform: rotate(0deg);
  }
  to {
    -o-transform: rotate(360deg);
  }
}

@keyframes rotating-function {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

Thanks for the code. I haven't tried it out yet, but will this also rotate the arrow from the down to the right position when the selected class is removed? — Cofey, Mar 02 '13 at 05:48
You will have to manually position the arrow after rotation. I like @wes's suggestion to use the `:after` pseudo element. — Teddy, Mar 02 '13 at 23:35

Rotating a background image with CSS3

2 Answers2

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