我正在编写一个shoutbox并尽可能使用户友好。它使用Tiny Scrollbar plugin用于jQuery，我希望合并一个额外的函数，使我能够将它移到div的底部。它应该自动滚动（可能具有平滑的动画效果）到底部。
这是实际的小滚动条代码：
(function($){
$.tiny = $.tiny || { };
$.tiny.scrollbar = {
options: {
axis: 'y', // vertical or horizontal scrollbar? ( x || y ).
wheel: 40, //how many pixels must the mouswheel scroll at a time.
scroll: true, //enable or disable the mousewheel;
size: 'auto', //set the size of the scrollbar to auto or a fixed number.
sizethumb: 'auto' //set the size of the thumb to auto or a fixed number.
}
};
$.fn.tinyscrollbar = function(options) {
var oElement = null;
var options = $.extend({}, $.tiny.scrollbar.options, options);
this.each(function() {
oElement = new Scrollbar($(this), options);
});
return $.extend(this, oElement);
};
function Scrollbar(root, options){
var oSelf = this;
var oWrapper = root;
var oViewport = { obj: $('.viewport', root) };
var oContent = { obj: $('.overview', root) };
var oScrollbar = { obj: $('.scrollbar', root) };
var oTrack = { obj: $('.track', oScrollbar.obj) };
var oThumb = { obj: $('.thumb', oScrollbar.obj) };
var sAxis = options.axis == 'x', sDirection = sAxis ? 'left' : 'top', sSize = sAxis ? 'Width' : 'Height';
var iScroll, iPosition = { start: 0, now: 0 }, iMouse = {};
function initialize() {
oSelf.update();
setEvents();
return oSelf;
}
this.update = function(bKeepScroll){
oViewport[options.axis] = oViewport.obj[0]['offset'+ sSize];
oContent[options.axis] = oContent.obj[0]['scroll'+ sSize];
oContent.ratio = oViewport[options.axis] / oContent[options.axis];
oScrollbar.obj.toggleClass('disable', oContent.ratio >= 1);
oTrack[options.axis] = options.size == 'auto' ? oViewport[options.axis] : options.size;
oThumb[options.axis] = Math.min(oTrack[options.axis], Math.max(0, ( options.sizethumb == 'auto' ? (oTrack[options.axis] * oContent.ratio) : options.sizethumb )));
oScrollbar.ratio = options.sizethumb == 'auto' ? (oContent[options.axis] / oTrack[options.axis]) : (oContent[options.axis] - oViewport[options.axis]) / (oTrack[options.axis] - oThumb[options.axis]);
iScroll = (bKeepScroll && oContent.ratio <= 1) ? Math.min((oContent[options.axis] - oViewport[options.axis]), Math.max(0, iScroll)) : 0;
setSize();
}
function setSize(){
oThumb.obj.css(sDirection, iScroll / oScrollbar.ratio);
oContent.obj.css(sDirection, -iScroll);
iMouse['start'] = oThumb.obj.offset()[sDirection];
var sCssSize = sSize.toLowerCase();
oScrollbar.obj.css(sCssSize, oTrack[options.axis]);
oTrack.obj.css(sCssSize, oTrack[options.axis]);
oThumb.obj.css(sCssSize, oThumb[options.axis]);
};
function setEvents(){
oThumb.obj.bind('mousedown', start);
oThumb.obj[0].ontouchstart = function(oEvent){
oEvent.preventDefault();
oThumb.obj.unbind('mousedown');
start(oEvent.touches[0]);
return false;
}
oTrack.obj.bind('mouseup', drag);
if(options.scroll && this.addEventListener){
oWrapper[0].addEventListener('DOMMouseScroll', wheel, false);
oWrapper[0].addEventListener('mousewheel', wheel, false );
}
else if(options.scroll){oWrapper[0].onmousewheel = wheel;}
};
function start(oEvent){
iMouse.start = sAxis ? oEvent.pageX : oEvent.pageY;
var oThumbDir = parseInt(oThumb.obj.css(sDirection));
iPosition.start = oThumbDir == 'auto' ? 0 : oThumbDir;
$(document).bind('mousemove', drag);
document.ontouchmove = function(oEvent){
$(document).unbind('mousemove');
drag(oEvent.touches[0]);
};
$(document).bind('mouseup', end);
oThumb.obj.bind('mouseup', end);
oThumb.obj[0].ontouchend = document.ontouchend = function(oEvent){
$(document).unbind('mouseup');
oThumb.obj.unbind('mouseup');
end(oEvent.touches[0]);
}
return false;
};
function wheel(oEvent){
if(!(oContent.ratio >= 1)){
oEvent = $.event.fix(oEvent || window.event);
var iDelta = oEvent.wheelDelta ? oEvent.wheelDelta/120 : -oEvent.detail/3;
iScroll -= iDelta * options.wheel;
iScroll = Math.min((oContent[options.axis] - oViewport[options.axis]), Math.max(0, iScroll));
oThumb.obj.css(sDirection, iScroll / oScrollbar.ratio);
oContent.obj.css(sDirection, -iScroll);
oEvent.preventDefault();
};
};
function end(oEvent){
$(document).unbind('mousemove', drag);
$(document).unbind('mouseup', end);
oThumb.obj.unbind('mouseup', end);
document.ontouchmove = oThumb.obj[0].ontouchend = document.ontouchend = null;
return false;
};
function drag(oEvent){
if(!(oContent.ratio >= 1)){
iPosition.now = Math.min((oTrack[options.axis] - oThumb[options.axis]), Math.max(0, (iPosition.start + ((sAxis ? oEvent.pageX : oEvent.pageY) - iMouse.start))));
iScroll = iPosition.now * oScrollbar.ratio;
oContent.obj.css(sDirection, -iScroll);
oThumb.obj.css(sDirection, iPosition.now);;
}
return false;
};
return initialize();
};
})(jQuery);
如果你可以修改它来做到这一点，我将永远感激不尽！
答案 0 :(得分：2)
$('.overview:first').css({top: (($('.overview:first').height() - $('.viewport:first').height()) * (-1)) });
$('.thumb:first').css({top: $('.track:first').height() - $('.thumb:first').height()});
答案 1 :(得分：1)
您还可以使用本机jQuery动画功能来实现流畅的自动滚动。并且无需更改原始的小滚动条脚本。
//Get the heights of the overview and viewport
oHeight = $('.overview:first').css("height");
oHeight = oHeight.substring(0, oHeight.length-2);
vHeight = $('.viewport:first').css("height");
vHeight = vHeight.substring(0, vHeight.length-2);
//Use the height values to determine how far we need to scroll
scroll = oHeight - vHeight;
//Animate it
$('.overview:first').animate({
top: "-"+scroll+"px"
}, 5000, function() {
// Animation complete.
});
//We need to do the same work for the track
tHeight = $('.thumb:first').css("height");
tHeight = tHeight.substring(0, tHeight.length-2);
trHeight = $('.track:first').css("height");
trHeight = trHeight.substring(0, trHeight.length-2);
tScroll = trHeight - tHeight;
$('.thumb:first').animate({
top: tScroll+"px"
}, 5000, function() {
// Animation complete.
}, 5000);
});
答案 2 :(得分：0)
我有同样的需要。要解决此问题，请在this.update函数之后将以下函数添加到代码中：
this.bottom = function(){
iScroll = oContent[options.axis] - oViewport[options.axis];
oThumb.obj.css(sDirection, iScroll / oScrollbar.ratio);
oContent.obj.css(sDirection, -iScroll);
};
然后，在您的页面上，在滚动条的update（）调用后添加对bottom（）的调用：
scrollBar.update();
scrollBar.bottom();
似乎对我来说很好。
罗比
答案 3 :(得分：0)
根据文档，您可以通过调用{$（element）.tinyscrollbar_update（'bottom'）}
来触发滚动条的底部