我有一个jquery交叉渐变工作，但唯一的问题是它放置在两个物理图像之间，我需要它在背景图像之间淡入淡出。
如果已经有一个很好的脚本可以做到这一点很棒，或者我可以很容易地改变它。
以下是插件代码：
/*
* Copyright 2007-2009 by Tobia Conforto <tobia.conforto@gmail.com>
*
* This program is free software; you can redistribute it and/or modify it under the terms of the GNU General
* Public License as published by the Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the
* implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License along with this program; if not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* Versions: 0.1 2007-08-19 Initial release
* 2008-08-21 Re-released under GPL v2
* 0.1.1 2008-09-18 Compatibility with prototype.js
* 0.2 2008-10-15 Linkable images, contributed by Tim Rainey <tim@zmlabs.com>
* 0.3 2008-10-22 Added option to repeat the animation a number of times, then stop
* 0.3.1 2008-11-11 Better error messages
* 0.3.2 2008-11-11 Fixed a couple of CSS bugs, contributed by Erwin Bot <info@ixgcms.nl>
* 0.3.3 2008-12-14 Added onclick option
* 0.3.4 2009-03-12 Added shuffle option, contributed by Ralf Santbergen <ralf_santbergen@hotmail.com>
* 0.3.5 2009-03-12 Fixed usage of href parameter in 'Ken Burns' mode
* 0.3.6 2009-04-16 Added alt option
* 0.3.7 2009-05-14 Fixed bug when container div doesn't have a position CSS attribute
*/
jQuery.fn.crossSlide = function(opts, plan) {
var self = this,
self_width = this.width(),
self_height = this.height();
// generic utilities
function format(str) {
for (var i = 1; i < arguments.length; i++)
str = str.replace(new RegExp('\\{' + (i-1) + '}', 'g'), arguments[i]);
return str;
}
function abort() {
arguments[0] = 'crossSlide: ' + arguments[0];
throw format.apply(null, arguments);
}
// first preload all the images, while getting their actual width and height
(function(proceed) {
var n_loaded = 0;
function loop(i, img) {
// for (i = 0; i < plan.length; i++) but with independent var i, img (for the closures)
img.onload = function(e) {
n_loaded++;
plan[i].width = img.width;
plan[i].height = img.height;
if (n_loaded == plan.length)
proceed();
}
img.src = plan[i].src;
if (i + 1 < plan.length)
loop(i + 1, new Image());
}
loop(0, new Image());
})(function() { // then proceed
// utility to parse "from" and "to" parameters
function parse_position_param(param) {
var zoom = 1;
var tokens = param.replace(/^\s*|\s*$/g, '').split(/\s+/);
if (tokens.length > 3) throw new Error();
if (tokens[0] == 'center')
if (tokens.length == 1)
tokens = ['center', 'center'];
else if (tokens.length == 2 && tokens[1].match(/^[\d.]+x$/i))
tokens = ['center', 'center', tokens[1]];
if (tokens.length == 3)
zoom = parseFloat(tokens[2].match(/^([\d.]+)x$/i)[1]);
var pos = tokens[0] + ' ' + tokens[1];
if (pos == 'left top' || pos == 'top left') return { xrel: 0, yrel: 0, zoom: zoom };
if (pos == 'left center' || pos == 'center left') return { xrel: 0, yrel: .5, zoom: zoom };
if (pos == 'left bottom' || pos == 'bottom left') return { xrel: 0, yrel: 1, zoom: zoom };
if (pos == 'center top' || pos == 'top center') return { xrel: .5, yrel: 0, zoom: zoom };
if (pos == 'center center') return { xrel: .5, yrel: .5, zoom: zoom };
if (pos == 'center bottom' || pos == 'bottom center') return { xrel: .5, yrel: 1, zoom: zoom };
if (pos == 'right top' || pos == 'top right') return { xrel: 1, yrel: 0, zoom: zoom };
if (pos == 'right center' || pos == 'center right') return { xrel: 1, yrel: .5, zoom: zoom };
if (pos == 'right bottom' || pos == 'bottom right') return { xrel: 1, yrel: 1, zoom: zoom };
return {
xrel: parseInt(tokens[0].match(/^(\d+)%$/)[1]) / 100,
yrel: parseInt(tokens[1].match(/^(\d+)%$/)[1]) / 100,
zoom: zoom
};
}
// utility to compute the css for a given phase between p.from and p.to
// phase = 1: begin fade-in, 2: end fade-in, 3: begin fade-out, 4: end fade-out
function position_to_css(p, phase) {
switch (phase) {
case 1:
var pos = 0;
break;
case 2:
var pos = fade_ms / (p.time_ms + 2 * fade_ms);
break;
case 3:
var pos = 1 - fade_ms / (p.time_ms + 2 * fade_ms);
break;
case 4:
var pos = 1;
break;
}
return {
left: Math.round(p.from.left + pos * (p.to.left - p.from.left )),
top: Math.round(p.from.top + pos * (p.to.top - p.from.top )),
width: Math.round(p.from.width + pos * (p.to.width - p.from.width )),
height: Math.round(p.from.height + pos * (p.to.height - p.from.height))
};
}
// check global params
if (! opts.fade)
abort('missing fade parameter.');
if (opts.speed && opts.sleep)
abort('you cannot set both speed and sleep at the same time.');
// conversion from sec to ms; from px/sec to px/ms
var fade_ms = Math.round(opts.fade * 1000);
if (opts.sleep)
var sleep = Math.round(opts.sleep * 1000);
if (opts.speed)
var speed = opts.speed / 1000,
fade_px = Math.round(fade_ms * speed);
// set container css
self.empty().css({
overflow: 'hidden',
padding: 0
});
if (! /^(absolute|relative|fixed)$/.test(self.css('position')))
self.css({ position: 'relative' });
if (! self.width() || ! self.height())
abort('container element does not have its own width and height');
// random sorting
if (opts.shuffle)
plan.sort(function() {
return Math.random() - 0.5;
});
// prepare each image
for (var i = 0; i < plan.length; ++i) {
var p = plan[i];
if (! p.src)
abort('missing src parameter in picture {0}.', i + 1);
if (speed) { // speed/dir mode
// check parameters and translate speed/dir mode into full mode (from/to/time)
switch (p.dir) {
case 'up':
p.from = { xrel: .5, yrel: 0, zoom: 1 };
p.to = { xrel: .5, yrel: 1, zoom: 1 };
var slide_px = p.height - self_height - 2 * fade_px;
break;
case 'down':
p.from = { xrel: .5, yrel: 1, zoom: 1 };
p.to = { xrel: .5, yrel: 0, zoom: 1 };
var slide_px = p.height - self_height - 2 * fade_px;
break;
case 'left':
p.from = { xrel: 0, yrel: .5, zoom: 1 };
p.to = { xrel: 1, yrel: .5, zoom: 1 };
var slide_px = p.width - self_width - 2 * fade_px;
break;
case 'right':
p.from = { xrel: 1, yrel: .5, zoom: 1 };
p.to = { xrel: 0, yrel: .5, zoom: 1 };
var slide_px = p.width - self_width - 2 * fade_px;
break;
default:
abort('missing or malformed "dir" parameter in picture {0}.', i + 1);
}
if (slide_px <= 0)
abort('picture number {0} is too short for the desired fade duration.', i + 1);
p.time_ms = Math.round(slide_px / speed);
} else if (! sleep) { // full mode
// check and parse parameters
if (! p.from || ! p.to || ! p.time)
abort('missing either speed/sleep option, or from/to/time params in picture {0}.', i + 1);
try {
p.from = parse_position_param(p.from)
} catch (e) {
abort('malformed "from" parameter in picture {0}.', i + 1);
}
try {
p.to = parse_position_param(p.to)
} catch (e) {
abort('malformed "to" parameter in picture {0}.', i + 1);
}
if (! p.time)
abort('missing "time" parameter in picture {0}.', i + 1);
p.time_ms = Math.round(p.time * 1000)
}
// precalculate left/top/width/height bounding values
if (p.from)
jQuery.each([ p.from, p.to ], function(i, from_to) {
from_to.width = Math.round(p.width * from_to.zoom);
from_to.height = Math.round(p.height * from_to.zoom);
from_to.left = Math.round((self_width - from_to.width) * from_to.xrel);
from_to.top = Math.round((self_height - from_to.height) * from_to.yrel);
});
// append the image (or anchor) element to the container
var elm;
if (p.href)
elm = jQuery(format('<a href="{0}"><img src="{1}"/></a>', p.href, p.src));
else
elm = jQuery(format('<img src="{0}"/>', p.src));
if (p.onclick)
elm.click(p.onclick);
if (p.alt)
elm.find('img').attr('alt', p.alt);
elm.appendTo(self);
}
speed = undefined; // speed mode has now been translated to full mode
// find images to animate and set initial css attributes
var imgs = self.find('img').css({
position: 'absolute',
visibility: 'hidden',
top: 0,
left: 0,
border: 0
});
// show first image
imgs.eq(0).css({ visibility: 'visible' });
if (! sleep)
imgs.eq(0).css(position_to_css(plan[0], 2));
// create animation chain
var countdown = opts.loop;
function create_chain(i, chainf) {
// building the chain backwards, or inside out
if (i % 2 == 0) {
if (sleep) {
// still image sleep
var i_sleep = i / 2,
i_hide = (i_sleep - 1 + plan.length) % plan.length,
img_sleep = imgs.eq(i_sleep),
img_hide = imgs.eq(i_hide);
var newf = function() {
img_hide.css('visibility', 'hidden');
setTimeout(chainf, sleep);
};
} else {
// single image slide
var i_slide = i / 2,
i_hide = (i_slide - 1 + plan.length) % plan.length,
img_slide = imgs.eq(i_slide),
img_hide = imgs.eq(i_hide),
time = plan[i_slide].time_ms,
slide_anim = position_to_css(plan[i_slide], 3);
var newf = function() {
img_hide.css('visibility', 'hidden');
img_slide.animate(slide_anim, time, 'linear', chainf);
};
}
} else {
if (sleep) {
// still image cross-fade
var i_from = Math.floor(i / 2),
i_to = Math.ceil(i / 2) % plan.length,
img_from = imgs.eq(i_from),
img_to = imgs.eq(i_to),
from_anim = {},
to_init = { visibility: 'visible' },
to_anim = {};
if (i_to > i_from) {
to_init.opacity = 0;
to_anim.opacity = 1;
} else {
from_anim.opacity = 0;
}
var newf = function() {
img_to.css(to_init);
if (from_anim.opacity != undefined)
img_from.animate(from_anim, fade_ms, 'linear', chainf);
else
img_to.animate(to_anim, fade_ms, 'linear', chainf);
};
} else {
// cross-slide + cross-fade
var i_from = Math.floor(i / 2),
i_to = Math.ceil(i / 2) % plan.length,
img_from = imgs.eq(i_from),
img_to = imgs.eq(i_to),
from_anim = position_to_css(plan[i_from], 4),
to_init = position_to_css(plan[i_to], 1),
to_anim = position_to_css(plan[i_to], 2);
if (i_to > i_from) {
to_init.opacity = 0;
to_anim.opacity = 1;
} else {
from_anim.opacity = 0;
}
to_init.visibility = 'visible';
var newf = function() {
img_from.animate(from_anim, fade_ms, 'linear');
img_to.css(to_init);
img_to.animate(to_anim, fade_ms, 'linear', chainf);
};
}
}
// if the loop option was requested, push a countdown check
if (opts.loop && i == plan.length * 2 - 2) {
var newf_orig = newf;
newf = function() {
if (--countdown) newf_orig();
}
}
if (i > 0)
return create_chain(i - 1, newf);
else
return newf;
}
var animation = create_chain(plan.length * 2 - 1, function() { return animation(); });
// start animation
animation();
});
return self;
};
以下是我如何称呼它：
<div id="foreground">
<style type="text/css">
#slides2 {
width: 100%;
height: 95px;
}
</style>
<script type="text/javascript">
$(function() {
$('#slides2').crossSlide({
sleep: 2,
fade: 1
}, [
{ src: 'http://treethink.treethink.net/images/foreground.png' },
{ src: 'http://treethink.treethink.net/images/foreground-night.png' },
]);
});
</script>
<div id="slides2"></div>
</div>
答案 0 :(得分：0)
从上面的代码中我假设你试图使图像淡出/出现在#foreground中，而不是div＃slides2。
尝试替换调用crossSlide方法的元素的id，如下所示：
$('#foreground').crossSlide({
sleep: 2,
fade: 1
}, [
{ src: 'http://treethink.treethink.net/images/foreground.png' },
{ src: 'http://treethink.treethink.net/images/foreground-night.png' },
]);
也许还有CSS
<style type="text/css">
#foregroundslides2 {
width: 100%;
height: 95px;
}
</style>