Aquí hay uno que funciona con BORDER-BOX ...
Hola chicos. Aquí hay un complemento jQuery que escribí para hacer lo mismo, pero también explica las diferencias de altura que ocurrirán cuando lo haya box-sizingconfigurado border-box.
También incluí un complemento "yShrinkOut" que oculta el elemento reduciéndolo a lo largo del eje y.
// -------------------------------------------------------------------
// Function to show an object by allowing it to grow to the given height value.
// -------------------------------------------------------------------
$.fn.yGrowIn = function (growTo, duration, whenComplete) {
var f = whenComplete || function () { }, // default function is empty
obj = this,
h = growTo || 'calc', // default is to calculate height
bbox = (obj.css('box-sizing') == 'border-box'), // check box-sizing
d = duration || 200; // default duration is 200 ms
obj.css('height', '0px').removeClass('hidden invisible');
var padTop = 0 + parseInt(getComputedStyle(obj[0], null).paddingTop), // get the starting padding-top
padBottom = 0 + parseInt(getComputedStyle(obj[0], null).paddingBottom), // get the starting padding-bottom
padLeft = 0 + parseInt(getComputedStyle(obj[0], null).paddingLeft), // get the starting padding-left
padRight = 0 + parseInt(getComputedStyle(obj[0], null).paddingRight); // get the starting padding-right
obj.css('padding-top', '0px').css('padding-bottom', '0px'); // Set the padding to 0;
// If no height was given, then calculate what the height should be.
if(h=='calc'){
var p = obj.css('position'); // get the starting object "position" style.
obj.css('opacity', '0'); // Set the opacity to 0 so the next actions aren't seen.
var cssW = obj.css('width') || 'auto'; // get the CSS width if it exists.
var w = parseInt(getComputedStyle(obj[0], null).width || 0) // calculate the computed inner-width with regard to box-sizing.
+ (!bbox ? parseInt((getComputedStyle(obj[0], null).borderRightWidth || 0)) : 0) // remove these values if using border-box.
+ (!bbox ? parseInt((getComputedStyle(obj[0], null).borderLeftWidth || 0)) : 0) // remove these values if using border-box.
+ (!bbox ? (padLeft + padRight) : 0); // remove these values if using border-box.
obj.css('position', 'fixed'); // remove the object from the flow of the document.
obj.css('width', w); // make sure the width remains the same. This prevents content from throwing off the height.
obj.css('height', 'auto'); // set the height to auto for calculation.
h = parseInt(0); // calculate the auto-height
h += obj[0].clientHeight // calculate the computed height with regard to box-sizing.
+ (bbox ? parseInt((getComputedStyle(obj[0], null).borderTopWidth || 0)) : 0) // add these values if using border-box.
+ (bbox ? parseInt((getComputedStyle(obj[0], null).borderBottomWidth || 0)) : 0) // add these values if using border-box.
+ (bbox ? (padTop + padBottom) : 0); // add these values if using border-box.
obj.css('height', '0px').css('position', p).css('opacity','1'); // reset the height, position, and opacity.
};
// animate the box.
// Note: the actual duration of the animation will change depending on the box-sizing.
// e.g., the duration will be shorter when using padding and borders in box-sizing because
// the animation thread is growing (or shrinking) all three components simultaneously.
// This can be avoided by retrieving the calculated "duration per pixel" based on the box-sizing type,
// but it really isn't worth the effort.
obj.animate({ 'height': h, 'padding-top': padTop, 'padding-bottom': padBottom }, d, 'linear', (f)());
};
// -------------------------------------------------------------------
// Function to hide an object by shrinking its height to zero.
// -------------------------------------------------------------------
$.fn.yShrinkOut = function (d,whenComplete) {
var f = whenComplete || function () { },
obj = this,
padTop = 0 + parseInt(getComputedStyle(obj[0], null).paddingTop),
padBottom = 0 + parseInt(getComputedStyle(obj[0], null).paddingBottom),
begHeight = 0 + parseInt(obj.css('height'));
obj.animate({ 'height': '0px', 'padding-top': 0, 'padding-bottom': 0 }, d, 'linear', function () {
obj.addClass('hidden')
.css('height', 0)
.css('padding-top', padTop)
.css('padding-bottom', padBottom);
(f)();
});
};
Cualquiera de los parámetros que utilicé puede omitirse o establecerse en nulo para aceptar los valores predeterminados. Los parámetros que utilicé:
- growTo: si desea anular todos los cálculos y establecer la altura CSS a la que crecerá el objeto, use este parámetro.
- duración: la duración de la animación ( obviamente ).
- whenComplete: una función que se ejecutará cuando se complete la animación.
