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Why doesn't jQuery.animate() work for CSS3 rotations, and how can we achieve cross-browser animated rotations using jQuery?
Why doesn't jQuery.animate() work for CSS3 rotations, and how can we achieve cross-browser animated rotations using jQuery?
Dec 04, 2024 am 07:57 AM
Cross-Browser Rotation with jQuery.animate()
Problem
Cross-browser rotation with jQuery.animate() proves challenging due to the non-animation capabilities of CSS-Transforms. The code below demonstrates the issue:
$(document).ready(function () {
DoRotate(30);
AnimateRotate(30);
});
function DoRotate(d) {
$("#MyDiv1").css({
'-moz-transform':'rotate('+d+'deg)',
'-webkit-transform':'rotate('+d+'deg)',
'-o-transform':'rotate('+d+'deg)',
'-ms-transform':'rotate('+d+'deg)',
'transform': 'rotate('+d+'deg)'
});
}
function AnimateRotate(d) {
$("#MyDiv2").animate({
'-moz-transform':'rotate('+d+'deg)',
'-webkit-transform':'rotate('+d+'deg)',
'-o-transform':'rotate('+d+'deg)',
'-ms-transform':'rotate('+d+'deg)',
'transform':'rotate('+d+'deg)'
}, 1000);
}
Rotation works when using .css(), but not with .animate(). Why? And how can we overcome this obstacle?
Solution
While CSS-Transforms lack direct animation support in jQuery, a workaround is possible using a step-callback like this:
function AnimateRotate(angle) {
// Cache the object for performance
var $elem = $('#MyDiv2');
// Use a pseudo object for the animation (starts from `0` to `angle`)
$({deg: 0}).animate({deg: angle}, {
duration: 2000,
step: function(now) {
// Use the `now` parameter (current animation position) in the step-callback
$elem.css({
transform: 'rotate(' + now + 'deg)'
});
}
});
}
This method allows for the rotation of elements using jQuery. Additionally, jQuery 1.7 eliminates the need for CSS3 transform prefixes.
jQuery Plugin
To simplify the process, create a jQuery plugin like this:
$.fn.animateRotate = function(angle, duration, easing, complete) {
return this.each(function() {
var $elem = $(this);
$({deg: 0}).animate({deg: angle}, {
duration: duration,
easing: easing,
step: function(now) {
$elem.css({
transform: 'rotate(' + now + 'deg)'
});
},
complete: complete || $.noop
});
});
};
$('#MyDiv2').animateRotate(90);
Optimized Plugin
For better efficiency and flexibility, an optimized plugin can be created:
$.fn.animateRotate = function(angle, duration, easing, complete) {
var args = $.speed(duration, easing, complete);
var step = args.step;
return this.each(function(i, e) {
args.complete = $.proxy(args.complete, e);
args.step = function(now) {
$.style(e, 'transform', 'rotate(' + now + 'deg)');
if (step) return step.apply(e, arguments);
};
$({deg: 0}).animate({deg: angle}, args);
});
};
Usage
The plugin provides two ways to use it:
- Single line syntax:
$(node).animateRotate(90);
$(node).animateRotate(90, function () {});
$(node).animateRotate(90, 1337, 'linear', function () {});
- Object syntax (preferred for more than three arguments):
$(node).animateRotate(90, {
duration: 1337,
easing: 'linear',
complete: function () {},
step: function () {}
});
Conclusion
This plugin enables cross-browser CSS rotation using jQuery's animation capabilities. It eliminates the need for manual rotation calculations and provides a convenient and optimized way to achieve rotation effects.
The above is the detailed content of Why doesn't jQuery.animate() work for CSS3 rotations, and how can we achieve cross-browser animated rotations using jQuery?. For more information, please follow other related articles on the PHP Chinese website!
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