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我正在使用Jquery Scroll Follow插件允许一个框随着用户向下滚动网站。 Scroll Follow允许用户禁用或启用滚动功能，并使用cookie插件记住用户在不同页面上的选择。使用Jquery Scroll跟随插件与Cookie插件
滚动跟随效果很好，但代码可以在用户第一次访问网站时立即滚动。我想在用户第一次进入网站时禁用默认设置，从而为用户提供启用滚动的选项。
我试着玩弄cookie的真/假设置，但我无法让它正常工作。我包含下面的代码，并感谢帮助将默认更改为不滚动。
我试过要求对开发人员的网站帮助，但没有得到任何回应： link text
感谢。
/**
* jquery.scrollFollow.js
* Copyright (c) 2008 Net Perspective (http://kitchen.net-perspective.com/)
* Licensed under the MIT License (http://www.opensource.org/licenses/mit-license.php)
*
* @author R.A. Ray
*
* @projectDescription jQuery plugin for allowing an element to animate down as the user scrolls the page.
*
* @version 0.4.0
*
* @requires jquery.js (tested with 1.2.6)
* @requires ui.core.js (tested with 1.5.2)
*
* @optional jquery.cookie.js (http://www.stilbuero.de/2006/09/17/cookie-plugin-for-jquery/)
* @optional jquery.easing.js (http://gsgd.co.uk/sandbox/jquery/easing/ - tested with 1.3)
*
* @param speed int - Duration of animation (in milliseconds)
* default: 500
* @param offset int - Number of pixels box should remain from top of viewport
* default: 0
* @param easing string - Any one of the easing options from the easing plugin - Requires jQuery Easing Plugin <http://gsgd.co.uk/sandbox/jquery/easing/>
* default: 'linear'
* @param container string - ID of the containing div
* default: box's immediate parent
* @param killSwitch string - ID of the On/Off toggle element
* default: 'killSwitch'
* @param onText string - killSwitch text to be displayed if sliding is enabled
* default: 'Turn Slide Off'
* @param offText string - killSwitch text to be displayed if sliding is disabled
* default: 'Turn Slide On'
* @param relativeTo string - Scroll animation can be relative to either the 'top' or 'bottom' of the viewport
* default: 'top'
* @param delay int - Time between the end of the scroll and the beginning of the animation in milliseconds
* default: 0
*/
(function(jQuery) {
jQuery.scrollFollow = function (box, options)
{
// Convert box into a jQuery object
box = jQuery(box);
// 'box' is the object to be animated
var position = box.css('position');
function ani()
{
// The script runs on every scroll which really means many times during a scroll.
// We don't want multiple slides to queue up.
box.queue([ ]);
// A bunch of values we need to determine where to animate to
var viewportHeight = parseInt(jQuery(window).height());
var pageScroll = parseInt(jQuery(document).scrollTop());
var parentTop = parseInt(box.cont.offset().top);
var parentHeight = parseInt(box.cont.attr('offsetHeight'));
var boxHeight = parseInt(box.attr('offsetHeight') + (parseInt(box.css('marginTop')) || 0) + (parseInt(box.css('marginBottom')) || 0));
var aniTop;
// Make sure the user wants the animation to happen
if (isActive)
{
// If the box should animate relative to the top of the window
if (options.relativeTo == 'top')
{
// Don't animate until the top of the window is close enough to the top of the box
if (box.initialOffsetTop >= (pageScroll + options.offset))
{
aniTop = box.initialTop;
}
else
{
aniTop = Math.min((Math.max((-parentTop), (pageScroll - box.initialOffsetTop + box.initialTop)) + options.offset), (parentHeight - boxHeight - box.paddingAdjustment));
}
}
// If the box should animate relative to the bottom of the window
else if (options.relativeTo == 'bottom')
{
// Don't animate until the bottom of the window is close enough to the bottom of the box
if ((box.initialOffsetTop + boxHeight) >= (pageScroll + options.offset + viewportHeight))
{
aniTop = box.initialTop;
}
else
{
aniTop = Math.min((pageScroll + viewportHeight - boxHeight - options.offset), (parentHeight - boxHeight));
}
}
// Checks to see if the relevant scroll was the last one
// "-20" is to account for inaccuracy in the timeout
if ((new Date().getTime() - box.lastScroll) >= (options.delay - 20))
{
box.animate(
{
top: aniTop
}, options.speed, options.easing
);
}
}
};
// For user-initiated stopping of the slide
var isActive = true;
if (jQuery.cookie != undefined)
{
if(jQuery.cookie('scrollFollowSetting' + box.attr('id')) == 'false')
{
var isActive = false;
jQuery('#' + options.killSwitch).text(options.offText)
.toggle(
function()
{
isActive = true;
jQuery(this).text(options.onText);
jQuery.cookie('scrollFollowSetting' + box.attr('id'), true, { expires: 365, path: '/'});
ani();
},
function()
{
isActive = false;
jQuery(this).text(options.offText);
box.animate(
{
top: box.initialTop
}, options.speed, options.easing
);
jQuery.cookie('scrollFollowSetting' + box.attr('id'), false, { expires: 365, path: '/'});
}
);
}
else
{
jQuery('#' + options.killSwitch).text(options.onText)
.toggle(
function()
{
isActive = false;
jQuery(this).text(options.offText);
box.animate(
{
top: box.initialTop
}, 0
);
jQuery.cookie('scrollFollowSetting' + box.attr('id'), false, { expires: 365, path: '/'});
},
function()
{
isActive = true;
jQuery(this).text(options.onText);
jQuery.cookie('scrollFollowSetting' + box.attr('id'), true, { expires: 365, path: '/'});
ani();
}
);
}
}
// If no parent ID was specified, and the immediate parent does not have an ID
// options.container will be undefined. So we need to figure out the parent element.
if (options.container == '')
{
box.cont = box.parent();
}
else
{
box.cont = jQuery('#' + options.container);
}
// Finds the default positioning of the box.
box.initialOffsetTop = parseInt(box.offset().top);
box.initialTop = parseInt(box.css('top')) || 0;
// Hack to fix different treatment of boxes positioned 'absolute' and 'relative'
if (box.css('position') == 'relative')
{
box.paddingAdjustment = parseInt(box.cont.css('paddingTop')) + parseInt(box.cont.css('paddingBottom'));
}
else
{
box.paddingAdjustment = 0;
}
// Animate the box when the page is scrolled
jQuery(window).scroll(function()
{
// Sets up the delay of the animation
jQuery.fn.scrollFollow.interval = setTimeout(function(){ ani();} , options.delay);
// To check against right before setting the animation
box.lastScroll = new Date().getTime();
}
);
// Animate the box when the page is resized
jQuery(window).resize(function()
{
// Sets up the delay of the animation
jQuery.fn.scrollFollow.interval = setTimeout(function(){ ani();} , options.delay);
// To check against right before setting the animation
box.lastScroll = new Date().getTime();
}
);
// Run an initial animation on page load
box.lastScroll = 0;
ani();
};
jQuery.fn.scrollFollow = function (options)
{
options = options || {};
options.relativeTo = options.relativeTo || 'top';
options.speed = options.speed || 500;
options.offset = options.offset || 0;
options.easing = options.easing || 'swing';
options.container = options.container || this.parent().attr('id');
options.killSwitch = options.killSwitch || 'killSwitch';
options.onText = options.onText || 'Turn Slide Off';
options.offText = options.offText || 'Turn Slide On';
options.delay = options.delay || 0;
this.each(function()
{
new jQuery.scrollFollow(this, options);
}
);
return this;
};
})(jQuery);