我正在使用jQuery SimplyScroll plugin在我的页面上创建一个圆形图像轮播。我从一个简单的空<div>：
<div id="scroller-wrapper">
</div>
然后我追加一个无序列表...
$("#scroller-wrapper").append("<ul id='scroller' />");
...我动态添加图像，然后启动SimplyScroll插件。结果如下：
<div id="scroller-wrapper">
<div class="simply-scroll simply-scroll-container">
<div class="simply-scroll-clip">
<ul id="scroller" class="simply-scroll-list" style="width: 2808px;">
<li><img src="image1.png" alt="Image 1" /></li>
<!-- more images -->
</ul>
</div>
</div>
</div>
到目前为止一切顺利。问题是，我需要定期清空卷轴并使用所有新图像重新初始化它。所以当附加无序列表时，我首先尝试清空包装<div>，如下所示：
$("#scroller-wrapper").empty().append("<ul id='scroller' />");
但正如您所看到的，SimplyScroll已动态插入了一些自己的<div>，而这些似乎并未受.empty()的影响。所以当我重新初始化滚动条时，我得到了这个：
<div id="scroller-wrapper">
<div class="simply-scroll simply-scroll-container">
<div class="simply-scroll-clip">
<div class="simply-scroll simply-scroll-container">
<div class="simply-scroll-clip">
<ul id="scroller" class="simply-scroll-list" style="width: 2808px;">
<li><img src="image1.png" alt="Image 1" /></li>
<!-- more images -->
</ul>
</div>
</div>
</div>
</div>
</div>
由于未删除由SimplyScroll生成的<div>，因此新的滚动条会附加在其中，但不起作用。
如何完全清空#scroller的内容，包括动态添加的元素，这样每次初始化滚动条时我都可以“从头开始”重启？
答案 0 :(得分：0)
我已将一些标准代码从TypeScript移植到Javascript，并增强了SimplyScroll以支持实例数据和方法调用。
我还为您添加了stop和start方法，允许您在项目更改后终止计时器并重新初始化布局。
我没时间完成这项工作，但它应该为您提供现在需要的钩子。
像这样使用：
$("#images").simplyScroll({...options...});
然后当您想要更改内容时：
$('#images').simplyScroll('stop');
$('#images').empty().append('...new content...')
$('#images').simplyScroll('start');
以下完整修改后的代码：
/*
* simplyScroll 2 - a scroll-tastic jQuery plugin
*
* http://logicbox.net/jquery/simplyscroll/
*
* Copyright (c) 2009-2012 Will Kelly - http://logicbox.net
*
* Dual licensed under the MIT and GPL licenses.
*
* Version: 2.0.5 Last revised: 10/05/2012
*
*/
(function ($, window, undefined) {
$.fn.simplyScroll = function (options, args) {
var THIS = this;
// If a string is supplied, assume we are calling a method on the add-in
if (typeof options === 'string') {
this.each(function () {
var instance = $(this).data('simplyscroll');
if (!instance) {
alert("Attempted to call method '" + options + "' prior to initialization.");
return;
}
if (!$.isFunction(instance[options])) {
alert("Method '" + options + "' does not exist");
return;
}
instance[options].apply(instance, args);
});
}
else {
THIS.each(function () {
var instance = $(this).data('simplyscroll');
if (instance) {
// Reinit the add-in options
instance._changeOptions(options);
} else {
$(this).data('simplyscroll', new $.simplyScroll(this, options));
}
});
}
return THIS;
//return this.each(function () {
// new $.simplyScroll(this, options);
//});
};
var defaults = {
customClass: 'simply-scroll',
frameRate: 24, //No of movements per second
speed: 1, //No of pixels per frame
orientation: 'horizontal', //'horizontal or 'vertical' - not to be confused with device orientation
auto: true,
autoMode: 'loop', //auto = true, 'loop' or 'bounce',
manualMode: 'end', //auto = false, 'loop' or 'end'
direction: 'forwards', //'forwards' or 'backwards'.
pauseOnHover: true, //autoMode = loop|bounce only
pauseOnTouch: true, //" touch device only
pauseButton: false, //" generates an extra element to allow manual pausing
startOnLoad: false //use this to delay starting of plugin until all page assets have loaded
};
$.simplyScroll = function (el, options) {
var self = this;
this.o = $.extend({}, defaults, options || {});
this.isAuto = this.o.auto !== false && this.o.autoMode.match(/^loop|bounce$/) !== null;
this.isHorizontal = this.o.orientation.match(/^horizontal|vertical$/) !== null && this.o.orientation == defaults.orientation;
this.isRTL = this.isHorizontal && $("html").attr('dir') == 'rtl';
this.isForwards = !this.isAuto || (this.isAuto && this.o.direction.match(/^forwards|backwards$/) !== null && this.o.direction == defaults.direction) && !this.isRTL;
this.isLoop = this.isAuto && this.o.autoMode == 'loop' || !this.isAuto && this.o.manualMode == 'loop';
this.supportsTouch = ('createTouch' in document);
this.events = this.supportsTouch ?
{ start: 'touchstart MozTouchDown', move: 'touchmove MozTouchMove', end: 'touchend touchcancel MozTouchRelease' } :
{ start: 'mouseenter', end: 'mouseleave' };
this.$list = $(el); //called on ul/ol/div etc
var $items = this.$list.children();
//generate extra markup
this.$list.addClass('simply-scroll-list')
.wrap('<div class="simply-scroll-clip"></div>')
.parent().wrap('<div class="' + this.o.customClass + ' simply-scroll-container"></div>');
if (!this.isAuto) { //button placeholders
this.$list.parent().parent()
.prepend('<div class="simply-scroll-forward"></div>')
.prepend('<div class="simply-scroll-back"></div>');
} else {
if (this.o.pauseButton) {
this.$list.parent().parent()
.prepend('<div class="simply-scroll-btn simply-scroll-btn-pause"></div>');
this.o.pauseOnHover = false;
}
}
//wrap an extra div around the whole lot if elements scrolled aren't equal
if ($items.length > 1) {
var extra_wrap = false,
total = 0;
if (this.isHorizontal) {
$items.each(function () { total += $(this).outerWidth(true); });
extra_wrap = $items.eq(0).outerWidth(true) * $items.length !== total;
} else {
$items.each(function () { total += $(this).outerHeight(true); });
extra_wrap = $items.eq(0).outerHeight(true) * $items.length !== total;
}
if (extra_wrap) {
this.$list = this.$list.wrap('<div></div>').parent().addClass('simply-scroll-list');
if (this.isHorizontal) {
this.$list.children().css({ "float": 'left', width: total + 'px' });
} else {
this.$list.children().css({ height: total + 'px' });
}
}
}
if (!this.o.startOnLoad) {
this.init();
} else {
//wait for load before completing setup
$(window).load(function () { self.init(); });
}
};
$.simplyScroll.fn = $.simplyScroll.prototype = {};
$.simplyScroll.fn.extend = $.simplyScroll.extend = $.extend;
$.simplyScroll.fn.extend({
_changeOptions: function (options) {
// Options have changed - reinit
},
stop: function () {
this.isAuto = false;
this.moveStop(this.movement);
},
start: function () {
this.init();
this.isAuto = true;
},
init: function () {
this.$items = this.$list.children();
this.$clip = this.$list.parent(); //this is the element that scrolls
this.$container = this.$clip.parent();
this.$btnBack = $('.simply-scroll-back', this.$container);
this.$btnForward = $('.simply-scroll-forward', this.$container);
if (!this.isHorizontal) {
this.itemMax = this.$items.eq(0).outerHeight(true);
this.clipMax = this.$clip.height();
this.dimension = 'height';
this.moveBackClass = 'simply-scroll-btn-up';
this.moveForwardClass = 'simply-scroll-btn-down';
this.scrollPos = 'Top';
} else {
this.itemMax = this.$items.eq(0).outerWidth(true);
this.clipMax = this.$clip.width();
this.dimension = 'width';
this.moveBackClass = 'simply-scroll-btn-left';
this.moveForwardClass = 'simply-scroll-btn-right';
this.scrollPos = 'Left';
}
this.posMin = 0;
this.posMax = this.$items.length * this.itemMax;
var addItems = Math.ceil(this.clipMax / this.itemMax);
//auto scroll loop & manual scroll bounce or end(to-end)
if (this.isAuto && this.o.autoMode == 'loop') {
this.$list.css(this.dimension, this.posMax + (this.itemMax * addItems) + 'px');
this.posMax += (this.clipMax - this.o.speed);
if (this.isForwards) {
this.$items.slice(0, addItems).clone(true).appendTo(this.$list);
this.resetPosition = 0;
} else {
this.$items.slice(-addItems).clone(true).prependTo(this.$list);
this.resetPosition = this.$items.length * this.itemMax;
//due to inconsistent RTL implementation force back to LTR then fake
if (this.isRTL) {
this.$clip[0].dir = 'ltr';
//based on feedback seems a good idea to force float right
this.$items.css('float', 'right');
}
}
//manual and loop
} else if (!this.isAuto && this.o.manualMode == 'loop') {
this.posMax += this.itemMax * addItems;
this.$list.css(this.dimension, this.posMax + (this.itemMax * addItems) + 'px');
this.posMax += (this.clipMax - this.o.speed);
var items_append = this.$items.slice(0, addItems).clone(true).appendTo(this.$list);
var items_prepend = this.$items.slice(-addItems).clone(true).prependTo(this.$list);
this.resetPositionForwards = this.resetPosition = addItems * this.itemMax;
this.resetPositionBackwards = this.$items.length * this.itemMax;
//extra events to force scroll direction change
var self = this;
this.$btnBack.bind(this.events.start, function () {
self.isForwards = false;
self.resetPosition = self.resetPositionBackwards;
});
this.$btnForward.bind(this.events.start, function () {
self.isForwards = true;
self.resetPosition = self.resetPositionForwards;
});
} else { //(!this.isAuto && this.o.manualMode=='end')
this.$list.css(this.dimension, this.posMax + 'px');
if (this.isForwards) {
this.resetPosition = 0;
} else {
this.resetPosition = this.$items.length * this.itemMax;
//due to inconsistent RTL implementation force back to LTR then fake
if (this.isRTL) {
this.$clip[0].dir = 'ltr';
//based on feedback seems a good idea to force float right
this.$items.css('float', 'right');
}
}
}
this.resetPos() //ensure scroll position is reset
this.interval = null;
this.intervalDelay = Math.floor(1000 / this.o.frameRate);
if (!(!this.isAuto && this.o.manualMode == 'end')) { //loop mode
//ensure that speed is divisible by item width. Helps to always make images even not odd widths!
while (this.itemMax % this.o.speed !== 0) {
this.o.speed--;
if (this.o.speed === 0) {
this.o.speed = 1;
break;
}
}
}
var self = this;
this.trigger = null;
this.funcMoveBack = function (e) {
if (e !== undefined) {
e.preventDefault();
}
self.trigger = !self.isAuto && self.o.manualMode == 'end' ? this : null;
if (self.isAuto) {
self.isForwards ? self.moveBack() : self.moveForward();
} else {
self.moveBack();
}
};
this.funcMoveForward = function (e) {
if (e !== undefined) {
e.preventDefault();
}
self.trigger = !self.isAuto && self.o.manualMode == 'end' ? this : null;
if (self.isAuto) {
self.isForwards ? self.moveForward() : self.moveBack();
} else {
self.moveForward();
}
};
this.funcMovePause = function () { self.movePause(); };
this.funcMoveStop = function () { self.moveStop(); };
this.funcMoveResume = function () { self.moveResume(); };
if (this.isAuto) {
this.paused = false;
function togglePause() {
if (self.paused === false) {
self.paused = true;
self.funcMovePause();
} else {
self.paused = false;
self.funcMoveResume();
}
return self.paused;
};
//disable pauseTouch when links are present
if (this.supportsTouch && this.$items.find('a').length) {
this.supportsTouch = false;
}
if (this.isAuto && this.o.pauseOnHover && !this.supportsTouch) {
this.$clip.bind(this.events.start, this.funcMovePause).bind(this.events.end, this.funcMoveResume);
} else if (this.isAuto && this.o.pauseOnTouch && !this.o.pauseButton && this.supportsTouch) {
var touchStartPos, scrollStartPos;
this.$clip.bind(this.events.start, function (e) {
togglePause();
var touch = e.originalEvent.touches[0];
touchStartPos = self.isHorizontal ? touch.pageX : touch.pageY;
scrollStartPos = self.$clip[0]['scroll' + self.scrollPos];
e.stopPropagation();
e.preventDefault();
}).bind(this.events.move, function (e) {
e.stopPropagation();
e.preventDefault();
var touch = e.originalEvent.touches[0],
endTouchPos = self.isHorizontal ? touch.pageX : touch.pageY,
pos = (touchStartPos - endTouchPos) + scrollStartPos;
if (pos < 0) pos = 0;
else if (pos > self.posMax) pos = self.posMax;
self.$clip[0]['scroll' + self.scrollPos] = pos;
//force pause
self.funcMovePause();
self.paused = true;
});
} else {
if (this.o.pauseButton) {
this.$btnPause = $(".simply-scroll-btn-pause", this.$container)
.bind('click', function (e) {
e.preventDefault();
togglePause() ? $(this).addClass('active') : $(this).removeClass('active');
});
}
}
this.funcMoveForward();
} else {
this.$btnBack
.addClass('simply-scroll-btn' + ' ' + this.moveBackClass)
.bind(this.events.start, this.funcMoveBack).bind(this.events.end, this.funcMoveStop);
this.$btnForward
.addClass('simply-scroll-btn' + ' ' + this.moveForwardClass)
.bind(this.events.start, this.funcMoveForward).bind(this.events.end, this.funcMoveStop);
if (this.o.manualMode == 'end') {
!this.isRTL ? this.$btnBack.addClass('disabled') : this.$btnForward.addClass('disabled');
}
}
},
moveForward: function () {
var self = this;
this.movement = 'forward';
if (this.trigger !== null) {
this.$btnBack.removeClass('disabled');
}
self.interval = setInterval(function () {
if (self.$clip[0]['scroll' + self.scrollPos] < (self.posMax - self.clipMax)) {
self.$clip[0]['scroll' + self.scrollPos] += self.o.speed;
} else if (self.isLoop) {
self.resetPos();
} else {
self.moveStop(self.movement);
}
}, self.intervalDelay);
},
moveBack: function () {
var self = this;
this.movement = 'back';
if (this.trigger !== null) {
this.$btnForward.removeClass('disabled');
}
self.interval = setInterval(function () {
if (self.$clip[0]['scroll' + self.scrollPos] > self.posMin) {
self.$clip[0]['scroll' + self.scrollPos] -= self.o.speed;
} else if (self.isLoop) {
self.resetPos();
} else {
self.moveStop(self.movement);
}
}, self.intervalDelay);
},
movePause: function () {
clearInterval(this.interval);
},
moveStop: function (moveDir) {
this.movePause();
if (this.trigger !== null) {
if (typeof moveDir !== 'undefined') {
$(this.trigger).addClass('disabled');
}
this.trigger = null;
}
if (this.isAuto) {
if (this.o.autoMode == 'bounce') {
moveDir == 'forward' ? this.moveBack() : this.moveForward();
}
}
},
moveResume: function () {
this.movement == 'forward' ? this.moveForward() : this.moveBack();
},
resetPos: function () {
this.$clip[0]['scroll' + this.scrollPos] = this.resetPosition;
}
});
})(jQuery, window);