animate() is a string naming an easing function to use. For example, given two list items, the step function fires four times at each step of the animation:
Note that the step function is called for each animated property on each animated element. fx: a reference to the jQuery.fx prototype object, which contains a number of properties such as elem for the animated element, start and end for the first and last value of the animated property, respectively, and prop for the property being animated.now: the numeric value of the property being animated at each step.It accepts two arguments ( now and fx), and this is set to the DOM element being animated. This function is useful for enabling custom animation types or altering the animation as it is occurring. animate() provides a step option - a callback function that is fired at each step of the animation. A clearfix can be used to automatically fix the dimensions of your main element without the need to set this manually. By fixing the dimensions of the original element being hidden however, it is possible to ensure that the animation runs smoothly. Note: if attempting to animate an element with a height or width of 0px, where contents of the element are visible due to overflow, jQuery may clip this overflow during animation.
To animate any element, such as a simple image: promise() method to obtain a promise to which you can attach callbacks that fire once for an animated set of any size, including zero elements. If multiple elements are animated, the callback is executed once per matched element, not once for the animation as a whole. If no elements are in the set, no callbacks are called. If supplied, the start, step, progress, complete, done, fail, and always callbacks are called on a per-element basis this is set to the DOM element being animated. The strings 'fast' and 'slow' can be supplied to indicate durations of 200 and 600 milliseconds, respectively. The default duration is 400 milliseconds. Durationĭurations are given in milliseconds higher values indicate slower animations, not faster ones. For example, given $( "someElement" ).hide().animate(, 500), the animation will run, but the element will remain hidden. animate() method does not make hidden elements visible as part of the effect. Note: Unlike shorthand animation methods such as. If a value is supplied with a leading += or -= sequence of characters, then the target value is computed by adding or subtracting the given number from the current value of the property. In order to use jQuery's built-in toggle state tracking, the 'toggle' keyword must be consistently given as the value of the property being animated.Īnimated properties can also be relative. These shortcuts allow for custom hiding and showing animations that take into account the display type of the element. In addition to numeric values, each property can take the strings 'show', 'hide', and 'toggle'. Or, if you want to animate font size, you would use fontSize or the CSS equivalent 'font-size' rather than simply 'font'. For example, if you want to animate the rendered border width, at least a border style and border width other than "auto" must be set in advance. font, background, border) are not fully supported. In addition to style properties, some non-style properties such as scrollTop and scrollLeft, as well as custom properties, can be animated. The units em and % can be specified where applicable. Property values are treated as a number of pixels unless otherwise specified. Animation Properties and ValuesĪll animated properties should be animated to a single numeric value, except as noted below most properties that are non-numeric cannot be animated using basic jQuery functionality (For example, width, height, or left can be animated but background-color cannot be, unless the jQuery.Color plugin is used). css() method, except that the range of properties is more restrictive. This object is similar to the one that can be sent to the. The only required parameter is a plain object of CSS properties. animate() method allows us to create animation effects on any numeric CSS property.
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